serve api on same origin at /api

README.md

@@ -1,5 +1,15 @@
 # Papercrate
 
+## Local Development
+
+Use the provided `papercrate.tmux` to spin up the full stack in one tmux session:
+
+```bash
+tmux -f papercrate.tmux attach
+```
+
+This creates windows for the compose stack, frontend dev server, backend API, and background worker using the repository-relative paths defined in the tmux file. Detach with `Ctrl+b d` and reattach later with the same command.
+
 ## Backend Integration Tests
 
 Integration tests require a running Postgres instance (and, optionally, Quickwit for OCR indexing). The repository includes a lightweight compose file for local runs:

backend/Cargo.lock

@@ -67,7 +67,7 @@ checksum = "9035ad2d096bed7955a320ee7e2230574d28fd3c3a0f186cbea1ff3c7eed5dbb"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -611,6 +611,7 @@ dependencies = [
  "diesel",
  "diesel_migrations",
  "dotenv",
+ "envy",
  "futures-util",
  "hex",
  "http-body-util",
@@ -625,6 +626,7 @@ dependencies = [
  "rand 0.8.5",
  "reqwest",
  "serde",
+ "serde-aux",
  "serde_json",
  "sha2",
  "tempfile",
@@ -635,6 +637,7 @@ dependencies = [
  "tracing",
  "tracing-subscriber",
  "url",
+ "utoipa",
  "uuid",
 ]
 
@@ -704,7 +707,7 @@ dependencies = [
  "regex",
  "rustc-hash",
  "shlex",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -989,7 +992,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -1000,7 +1003,7 @@ checksum = "d38308df82d1080de0afee5d069fa14b0326a88c14f15c5ccda35b4a6c414c81"
 dependencies = [
  "darling_core",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -1050,7 +1053,7 @@ dependencies = [
  "dsl_auto_type",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -1070,7 +1073,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fe2444076b48641147115697648dc743c2c00b61adade0f01ce67133c7babe8c"
 dependencies = [
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -1092,7 +1095,7 @@ checksum = "97369cbbc041bc366949bc74d34658d6cda5621039731c6310521892a3a20ae0"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -1118,7 +1121,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -1174,6 +1177,15 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "envy"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f47e0157f2cb54f5ae1bd371b30a2ae4311e1c028f575cd4e81de7353215965"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "equivalent"
 version = "1.0.2"
@@ -1287,7 +1299,7 @@ checksum = "162ee34ebcb7c64a8abebc059ce0fee27c2262618d7b60ed8faf72fef13c3650"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -1812,6 +1824,8 @@ checksum = "4b0f83760fb341a774ed326568e19f5a863af4a952def8c39f9ab92fd95b88e5"
 dependencies = [
  "equivalent",
  "hashbrown 0.16.0",
+ "serde",
+ "serde_core",
 ]
 
 [[package]]
@@ -2157,6 +2171,15 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d05e27ee213611ffe7d6348b942e8f942b37114c00cc03cec254295a4a17852e"
 
+[[package]]
+name = "ordered-float"
+version = "2.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68f19d67e5a2795c94e73e0bb1cc1a7edeb2e28efd39e2e1c9b7a40c1108b11c"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "outref"
 version = "0.5.2"
@@ -2267,7 +2290,7 @@ checksum = "6e918e4ff8c4549eb882f14b3a4bc8c8bc93de829416eacf579f1207a8fbf861"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -2359,7 +2382,31 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "479ca8adacdd7ce8f1fb39ce9ecccbfe93a3f1344b3d0d97f20bc0196208f62b"
 dependencies = [
  "proc-macro2",
- "syn",
+ "syn 2.0.106",
+]
+
+[[package]]
+name = "proc-macro-error"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "version_check",
 ]
 
 [[package]]
@@ -2877,6 +2924,28 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde-aux"
+version = "4.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "207f67b28fe90fb596503a9bf0bf1ea5e831e21307658e177c5dfcdfc3ab8a0a"
+dependencies = [
+ "chrono",
+ "serde",
+ "serde-value",
+ "serde_json",
+]
+
+[[package]]
+name = "serde-value"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3a1a3341211875ef120e117ea7fd5228530ae7e7036a779fdc9117be6b3282c"
+dependencies = [
+ "ordered-float",
+ "serde",
+]
+
 [[package]]
 name = "serde_core"
 version = "1.0.228"
@@ -2894,7 +2963,7 @@ checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -3082,6 +3151,16 @@ version = "2.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "unicode-ident",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.106"
@@ -3110,7 +3189,7 @@ checksum = "728a70f3dbaf5bab7f0c4b1ac8d7ae5ea60a4b5549c8a5914361c99147a709d2"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -3152,7 +3231,7 @@ checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -3163,7 +3242,7 @@ checksum = "3ff15c8ecd7de3849db632e14d18d2571fa09dfc5ed93479bc4485c7a517c913"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -3259,7 +3338,7 @@ checksum = "6e06d43f1345a3bcd39f6a56dbb7dcab2ba47e68e8ac134855e7e2bdbaf8cab8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -3409,7 +3488,7 @@ checksum = "81383ab64e72a7a8b8e13130c49e3dab29def6d0c7d76a03087b3cf71c5c6903"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -3514,6 +3593,31 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6c140620e7ffbb22c2dee59cafe6084a59b5ffc27a8859a5f0d494b5d52b6be"
 
+[[package]]
+name = "utoipa"
+version = "4.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c5afb1a60e207dca502682537fefcfd9921e71d0b83e9576060f09abc6efab23"
+dependencies = [
+ "indexmap",
+ "serde",
+ "serde_json",
+ "utoipa-gen",
+]
+
+[[package]]
+name = "utoipa-gen"
+version = "4.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20c24e8ab68ff9ee746aad22d39b5535601e6416d1b0feeabf78be986a5c4392"
+dependencies = [
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.106",
+ "uuid",
+]
+
 [[package]]
 name = "uuid"
 version = "1.18.1"
@@ -3615,7 +3719,7 @@ dependencies = [
  "log",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
  "wasm-bindgen-shared",
 ]
 
@@ -3650,7 +3754,7 @@ checksum = "9f07d2f20d4da7b26400c9f4a0511e6e0345b040694e8a75bd41d578fa4421d7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -3727,7 +3831,7 @@ checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -3738,7 +3842,7 @@ checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -3965,7 +4069,7 @@ checksum = "38da3c9736e16c5d3c8c597a9aaa5d1fa565d0532ae05e27c24aa62fb32c0ab6"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
  "synstructure",
 ]
 
@@ -3986,7 +4090,7 @@ checksum = "88d2b8d9c68ad2b9e4340d7832716a4d21a22a1154777ad56ea55c51a9cf3831"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]
@@ -4006,7 +4110,7 @@ checksum = "d71e5d6e06ab090c67b5e44993ec16b72dcbaabc526db883a360057678b48502"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
  "synstructure",
 ]
 
@@ -4046,7 +4150,7 @@ checksum = "5b96237efa0c878c64bd89c436f661be4e46b2f3eff1ebb976f7ef2321d2f58f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.106",
 ]
 
 [[package]]

backend/Cargo.toml

@@ -25,6 +25,8 @@ aws-credential-types = "1.2"
 # Serialization
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
+envy = "0.4"
+serde-aux = "4.4"
 
 # Utilities
 tracing = "0.1"
@@ -44,6 +46,8 @@ base64 = "0.21"
 quick-xml = "0.32"
 futures-util = "0.3"
 url = "2.5"
+once_cell = "1.19"
+utoipa = { version = "4.2", default-features = false, features = ["chrono", "uuid", "preserve_order"] }
 
 # Error handling
 thiserror = "1.0"

backend/Dockerfile

@@ -20,7 +20,7 @@ COPY migrations ./migrations
 COPY tests ./tests
 COPY diesel.toml ./
 
-RUN cargo build --release --bin backend --bin worker --bin webdav
+RUN cargo build --release --bin backend --bin worker --bin webdav --bin admin
 RUN cargo install diesel_cli --no-default-features --features postgres
 
 FROM debian:trixie-slim AS runtime
@@ -53,6 +53,7 @@ RUN apt-get update \
 COPY --from=builder /app/target/release/backend /usr/local/bin/papercrate-backend
 COPY --from=builder /app/target/release/worker /usr/local/bin/papercrate-worker
 COPY --from=builder /app/target/release/webdav /usr/local/bin/papercrate-webdav
+COPY --from=builder /app/target/release/admin /usr/local/bin/papercrate-admin
 COPY --from=builder /usr/local/cargo/bin/diesel /usr/local/bin/diesel
 COPY migrations ./migrations
 COPY diesel.toml ./

backend/examples/hash_password.rs

@@ -1,19 +0,0 @@
-use argon2::{
-    password_hash::{PasswordHasher, SaltString},
-    Argon2,
-};
-use rand::thread_rng;
-use std::env;
-
-fn main() {
-    let password = env::args()
-        .nth(1)
-        .expect("Usage: cargo run --example hash_password <password>");
-    let salt = SaltString::generate(&mut thread_rng());
-    let argon2 = Argon2::default();
-    let hash = argon2
-        .hash_password(password.as_bytes(), &salt)
-        .expect("hashing failed")
-        .to_string();
-    println!("{}", hash);
-}

backend/migrations/202402240001_create_initial_schema/down.sql

@@ -1,11 +0,0 @@
-DROP INDEX IF EXISTS idx_document_tags_tag;
-DROP TABLE IF EXISTS document_tags;
-DROP INDEX IF EXISTS idx_document_versions_document;
-DROP TABLE IF EXISTS document_versions;
-DROP INDEX IF EXISTS idx_documents_deleted_at;
-DROP INDEX IF EXISTS idx_documents_folder;
-DROP TABLE IF EXISTS documents;
-DROP INDEX IF EXISTS idx_folders_parent;
-DROP TABLE IF EXISTS folders;
-DROP TABLE IF EXISTS tags;
-DROP TABLE IF EXISTS users;

backend/migrations/202402240001_create_initial_schema/up.sql

@@ -1,77 +0,0 @@
-CREATE EXTENSION IF NOT EXISTS "pgcrypto";
-
-CREATE TABLE users (
-    id UUID PRIMARY KEY,
-    username VARCHAR(100) NOT NULL UNIQUE,
-    password_hash VARCHAR(255) NOT NULL,
-    role VARCHAR(16) NOT NULL,
-    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
-);
-
-CREATE TABLE folders (
-    id UUID PRIMARY KEY,
-    name VARCHAR(255) NOT NULL,
-    parent_id UUID REFERENCES folders(id) ON DELETE SET NULL,
-    path_cache VARCHAR(1000),
-    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    CONSTRAINT folders_parent_name_unique UNIQUE (parent_id, name)
-);
-
-CREATE INDEX idx_folders_parent ON folders(parent_id);
-
-CREATE TABLE documents (
-    id UUID PRIMARY KEY,
-    filename VARCHAR(255) NOT NULL,
-    original_name VARCHAR(255) NOT NULL,
-    content_type VARCHAR(100),
-    folder_id UUID REFERENCES folders(id) ON DELETE SET NULL,
-    current_version INTEGER NOT NULL,
-    uploaded_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    deleted_at TIMESTAMPTZ,
-    metadata JSONB NOT NULL DEFAULT '{}'::jsonb
-);
-
-CREATE INDEX idx_documents_folder ON documents(folder_id);
-CREATE INDEX idx_documents_deleted_at ON documents(deleted_at);
-
-CREATE TABLE document_versions (
-    id UUID PRIMARY KEY,
-    document_id UUID NOT NULL REFERENCES documents(id) ON DELETE CASCADE,
-    version_number INTEGER NOT NULL,
-    s3_key VARCHAR(500) NOT NULL,
-    size_bytes BIGINT NOT NULL,
-    checksum VARCHAR(64) NOT NULL,
-    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    operations_summary JSONB NOT NULL DEFAULT '{}'::jsonb,
-    CONSTRAINT document_versions_unique_version UNIQUE (document_id, version_number)
-);
-
-CREATE INDEX idx_document_versions_document ON document_versions(document_id);
-
-CREATE TABLE tags (
-    id UUID PRIMARY KEY,
-    label VARCHAR(100) NOT NULL UNIQUE,
-    color VARCHAR(7),
-    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
-);
-
-CREATE TABLE document_tags (
-    document_id UUID NOT NULL REFERENCES documents(id) ON DELETE CASCADE,
-    tag_id UUID NOT NULL REFERENCES tags(id) ON DELETE CASCADE,
-    assigned_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    assigned_by UUID REFERENCES users(id),
-    PRIMARY KEY (document_id, tag_id)
-);
-
-CREATE INDEX idx_document_tags_tag ON document_tags(tag_id);
-
-INSERT INTO users (id, username, password_hash, role)
-VALUES (
-    gen_random_uuid(),
-    'admin',
-    '$argon2id$v=19$m=19456,t=2,p=1$UMkfsNut028fmZupy9JoQg$/YFvGQoEZ2hhMiDCyv68ZROF97GcwAxxRwRgwSbpX5U',
-    'admin'
-);

backend/migrations/202502130001_create_jobs/down.sql

@@ -1,5 +0,0 @@
-DROP TRIGGER IF EXISTS trg_jobs_updated_at ON jobs;
-DROP FUNCTION IF EXISTS touch_jobs_updated_at;
-DROP INDEX IF EXISTS idx_jobs_job_type;
-DROP INDEX IF EXISTS idx_jobs_status_run_after;
-DROP TABLE IF EXISTS jobs;

backend/migrations/202502130001_create_jobs/up.sql

@@ -1,28 +0,0 @@
-CREATE TABLE jobs (
-    id UUID PRIMARY KEY,
-    job_type TEXT NOT NULL,
-    payload JSONB NOT NULL,
-    status TEXT NOT NULL DEFAULT 'queued',
-    attempts INTEGER NOT NULL DEFAULT 0,
-    run_after TIMESTAMPTZ NOT NULL DEFAULT now(),
-    last_error TEXT,
-    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    CONSTRAINT jobs_status_check CHECK (status IN ('queued', 'processing', 'succeeded', 'failed'))
-);
-
-CREATE INDEX idx_jobs_status_run_after ON jobs (status, run_after);
-CREATE INDEX idx_jobs_job_type ON jobs (job_type);
-
-CREATE OR REPLACE FUNCTION touch_jobs_updated_at()
-RETURNS TRIGGER AS $$
-BEGIN
-    NEW.updated_at = now();
-    RETURN NEW;
-END;
-$$ LANGUAGE plpgsql;
-
-CREATE TRIGGER trg_jobs_updated_at
-BEFORE UPDATE ON jobs
-FOR EACH ROW
-EXECUTE FUNCTION touch_jobs_updated_at();

backend/migrations/202502130002_create_document_assets/down.sql

@@ -1,3 +0,0 @@
-DROP INDEX IF EXISTS idx_document_assets_type;
-DROP INDEX IF EXISTS idx_document_assets_version;
-DROP TABLE IF EXISTS document_assets;

backend/migrations/202502130002_create_document_assets/up.sql

@@ -1,15 +0,0 @@
-CREATE TABLE document_assets (
-    id UUID PRIMARY KEY,
-    document_version_id UUID NOT NULL REFERENCES document_versions(id) ON DELETE CASCADE,
-    asset_type TEXT NOT NULL,
-    s3_key TEXT NOT NULL,
-    mime_type TEXT NOT NULL,
-    width INTEGER,
-    height INTEGER,
-    metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
-    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    CONSTRAINT document_assets_unique UNIQUE (document_version_id, asset_type)
-);
-
-CREATE INDEX idx_document_assets_version ON document_assets(document_version_id);
-CREATE INDEX idx_document_assets_type ON document_assets(asset_type);

backend/migrations/202503040001_enforce_unique_folder_names/down.sql

@@ -1,4 +0,0 @@
-DROP INDEX IF EXISTS folders_parent_name_unique_idx;
-
-ALTER TABLE folders
-    ADD CONSTRAINT folders_parent_name_unique UNIQUE (parent_id, name);

backend/migrations/202503040001_enforce_unique_folder_names/up.sql

@@ -1,5 +0,0 @@
-ALTER TABLE folders
-    DROP CONSTRAINT IF EXISTS folders_parent_name_unique;
-
-CREATE UNIQUE INDEX folders_parent_name_unique_idx
-    ON folders (COALESCE(parent_id, '00000000-0000-0000-0000-000000000000'::uuid), name);

backend/migrations/202503090001_add_issued_at_to_documents/down.sql

@@ -1,2 +0,0 @@
-ALTER TABLE documents
-    DROP COLUMN issued_at;

backend/migrations/202503090001_add_issued_at_to_documents/up.sql

@@ -1,2 +0,0 @@
-ALTER TABLE documents
-    ADD COLUMN issued_at TIMESTAMPTZ;

backend/migrations/202503090002_add_name_to_documents/down.sql

@@ -1,2 +0,0 @@
-ALTER TABLE documents
-    DROP COLUMN name;

backend/migrations/202503090002_add_name_to_documents/up.sql

@@ -1,11 +0,0 @@
-ALTER TABLE documents
-    ADD COLUMN name VARCHAR(255);
-
-UPDATE documents
-SET name = CASE
-    WHEN filename ~ '\\.[^./]+$' THEN regexp_replace(filename, '\\.[^./]+$', '')
-    ELSE filename
-END;
-
-ALTER TABLE documents
-    ALTER COLUMN name SET NOT NULL;

backend/migrations/202503090003_rename_name_to_title/down.sql

@@ -1,2 +0,0 @@
-ALTER TABLE documents
-  RENAME COLUMN title TO name;

backend/migrations/202503090003_rename_name_to_title/up.sql

@@ -1,2 +0,0 @@
-ALTER TABLE documents
-  RENAME COLUMN name TO title;

backend/migrations/202503090004_create_refresh_tokens/down.sql

@@ -1 +0,0 @@
-DROP TABLE refresh_tokens;

backend/migrations/202503090004_create_refresh_tokens/up.sql

@@ -1,13 +0,0 @@
-CREATE TABLE refresh_tokens (
-    id UUID PRIMARY KEY,
-    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
-    token_hash TEXT NOT NULL,
-    issued_at TIMESTAMPTZ NOT NULL,
-    expires_at TIMESTAMPTZ NOT NULL,
-    revoked_at TIMESTAMPTZ,
-    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
-    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
-);
-
-CREATE INDEX idx_refresh_tokens_user_id ON refresh_tokens(user_id);
-CREATE INDEX idx_refresh_tokens_token_hash ON refresh_tokens(token_hash);

backend/migrations/202503120001_drop_asset_dimensions/down.sql

@@ -1,13 +0,0 @@
--- Restore width/height columns and repopulate from metadata where available.
-
-ALTER TABLE document_assets
-    ADD COLUMN width INTEGER,
-    ADD COLUMN height INTEGER;
-
-UPDATE document_assets
-SET width = (metadata->>'width')::INTEGER
-WHERE metadata ? 'width';
-
-UPDATE document_assets
-SET height = (metadata->>'height')::INTEGER
-WHERE metadata ? 'height';

backend/migrations/202503120001_drop_asset_dimensions/up.sql

@@ -1,15 +0,0 @@
--- Backfill existing width/height values into metadata then drop the columns.
-
-UPDATE document_assets
-SET metadata = metadata || jsonb_build_object('width', width)
-WHERE width IS NOT NULL
-  AND NOT (metadata ? 'width');
-
-UPDATE document_assets
-SET metadata = metadata || jsonb_build_object('height', height)
-WHERE height IS NOT NULL
-  AND NOT (metadata ? 'height');
-
-ALTER TABLE document_assets
-    DROP COLUMN width,
-    DROP COLUMN height;

backend/migrations/202503120003_use_version_uuid/down.sql

@@ -1,17 +0,0 @@
-ALTER TABLE documents ADD COLUMN current_version INT4;
-
-UPDATE documents AS d
-SET current_version = dv.version_number
-FROM document_versions AS dv
-WHERE dv.id = d.current_version_id;
-
-ALTER TABLE documents
-    ALTER COLUMN current_version SET NOT NULL;
-
-DROP INDEX IF EXISTS idx_documents_current_version_id;
-
-ALTER TABLE documents
-    DROP CONSTRAINT IF EXISTS documents_current_version_fk;
-
-ALTER TABLE documents
-    DROP COLUMN current_version_id;

backend/migrations/202503120003_use_version_uuid/up.sql

@@ -1,21 +0,0 @@
-ALTER TABLE documents ADD COLUMN current_version_id UUID;
-
-UPDATE documents AS d
-SET current_version_id = dv.id
-FROM document_versions AS dv
-WHERE dv.document_id = d.id
-  AND dv.version_number = d.current_version;
-
-ALTER TABLE documents
-    ALTER COLUMN current_version_id SET NOT NULL;
-
-ALTER TABLE documents
-    ADD CONSTRAINT documents_current_version_fk
-        FOREIGN KEY (current_version_id)
-        REFERENCES document_versions(id)
-        DEFERRABLE INITIALLY DEFERRED;
-
-CREATE INDEX idx_documents_current_version_id
-    ON documents(current_version_id);
-
-ALTER TABLE documents DROP COLUMN current_version;

backend/migrations/202503200001_add_correspondents/down.sql

@@ -1,5 +0,0 @@
-DROP INDEX IF EXISTS idx_document_correspondents_role;
-DROP INDEX IF EXISTS idx_document_correspondents_correspondent;
-DROP INDEX IF EXISTS idx_document_correspondents_document;
-DROP TABLE IF EXISTS document_correspondents;
-DROP TABLE IF EXISTS correspondents;

backend/migrations/202503200001_add_correspondents/up.sql

@@ -1,27 +0,0 @@
-CREATE TABLE correspondents (
-    id UUID PRIMARY KEY,
-    name VARCHAR(255) NOT NULL,
-    metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
-    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    CONSTRAINT correspondents_name_unique UNIQUE (name)
-);
-
-CREATE TABLE document_correspondents (
-    document_id UUID NOT NULL REFERENCES documents(id) ON DELETE CASCADE,
-    correspondent_id UUID NOT NULL REFERENCES correspondents(id) ON DELETE CASCADE,
-    role VARCHAR(32) NOT NULL,
-    assigned_at TIMESTAMPTZ NOT NULL DEFAULT now(),
-    assigned_by UUID REFERENCES users(id),
-    PRIMARY KEY (document_id, correspondent_id, role),
-    CONSTRAINT document_correspondents_role_check CHECK (role IN ('sender', 'receiver', 'other'))
-);
-
-CREATE INDEX idx_document_correspondents_document
-    ON document_correspondents(document_id);
-
-CREATE INDEX idx_document_correspondents_correspondent
-    ON document_correspondents(correspondent_id);
-
-CREATE INDEX idx_document_correspondents_role
-    ON document_correspondents(role);

backend/migrations/202503240001_index_documents_by_folder_title/down.sql

@@ -1,2 +0,0 @@
-DROP INDEX IF EXISTS idx_documents_folder_filename;
-DROP INDEX IF EXISTS idx_documents_folder_title;

backend/migrations/202503240001_index_documents_by_folder_title/up.sql

@@ -1,13 +0,0 @@
-CREATE INDEX idx_documents_folder_title
-    ON documents (
-        COALESCE(folder_id, '00000000-0000-0000-0000-000000000000'::uuid),
-        title
-    )
-    WHERE deleted_at IS NULL;
-
-CREATE INDEX idx_documents_folder_filename
-    ON documents (
-        COALESCE(folder_id, '00000000-0000-0000-0000-000000000000'::uuid),
-        filename
-    )
-    WHERE deleted_at IS NULL;

backend/migrations/202503240002_unique_document_names/down.sql

@@ -1,16 +0,0 @@
-DROP INDEX IF EXISTS documents_unique_folder_filename;
-DROP INDEX IF EXISTS idx_documents_folder_title;
-
-CREATE INDEX idx_documents_folder_title
-    ON documents (
-        COALESCE(folder_id, '00000000-0000-0000-0000-000000000000'::uuid),
-        title
-    )
-    WHERE deleted_at IS NULL;
-
-CREATE INDEX idx_documents_folder_filename
-    ON documents (
-        COALESCE(folder_id, '00000000-0000-0000-0000-000000000000'::uuid),
-        filename
-    )
-    WHERE deleted_at IS NULL;

backend/migrations/202503240002_unique_document_names/up.sql

@@ -1,18 +0,0 @@
-DROP INDEX IF EXISTS idx_documents_folder_title;
-DROP INDEX IF EXISTS idx_documents_folder_filename;
-DROP INDEX IF EXISTS documents_unique_folder_title;
-DROP INDEX IF EXISTS documents_unique_folder_filename;
-
-CREATE INDEX idx_documents_folder_title
-    ON documents (
-        COALESCE(folder_id, '00000000-0000-0000-0000-000000000000'::uuid),
-        title
-    )
-    WHERE deleted_at IS NULL;
-
-CREATE UNIQUE INDEX documents_unique_folder_filename
-    ON documents (
-        COALESCE(folder_id, '00000000-0000-0000-0000-000000000000'::uuid),
-        filename
-    )
-    WHERE deleted_at IS NULL;

backend/migrations/202503240003_add_metadata_to_document_versions/down.sql

@@ -1,2 +0,0 @@
-ALTER TABLE document_versions
-    DROP COLUMN metadata;

backend/migrations/202503240003_add_metadata_to_document_versions/up.sql

@@ -1,2 +0,0 @@
-ALTER TABLE document_versions
-    ADD COLUMN metadata JSONB NOT NULL DEFAULT '{}'::jsonb;

backend/migrations/202503240004_drop_folder_path_cache/down.sql

@@ -1,2 +0,0 @@
-ALTER TABLE folders
-    ADD COLUMN path_cache VARCHAR(1000);

backend/migrations/202503240004_drop_folder_path_cache/up.sql

@@ -1,2 +0,0 @@
-ALTER TABLE folders
-    DROP COLUMN path_cache;

backend/migrations/202503260001_initial_schema/down.sql

@@ -0,0 +1,21 @@
+DROP TRIGGER IF EXISTS trg_jobs_updated_at ON jobs;
+DROP FUNCTION IF EXISTS touch_jobs_updated_at();
+
+ALTER TABLE documents DROP CONSTRAINT IF EXISTS documents_current_version_fk;
+
+DROP TABLE IF EXISTS document_asset_objects;
+DROP TABLE IF EXISTS document_assets;
+DROP TABLE IF EXISTS document_versions;
+DROP TABLE IF EXISTS document_tags;
+DROP TABLE IF EXISTS document_correspondents;
+DROP TABLE IF EXISTS correspondents;
+DROP TABLE IF EXISTS documents;
+DROP TABLE IF EXISTS folders;
+DROP TABLE IF EXISTS tags;
+DROP TABLE IF EXISTS jobs;
+DROP TABLE IF EXISTS refresh_tokens;
+DROP TABLE IF EXISTS user_memberships;
+DROP TABLE IF EXISTS users;
+DROP TABLE IF EXISTS tenants;
+
+DROP EXTENSION IF EXISTS "pgcrypto";

backend/migrations/202503260001_initial_schema/up.sql

@@ -0,0 +1,244 @@
+CREATE EXTENSION IF NOT EXISTS "pgcrypto";
+
+CREATE TABLE tenants (
+    id UUID PRIMARY KEY,
+    slug TEXT NOT NULL UNIQUE,
+    storage_root TEXT,
+    quickwit_index TEXT,
+    status TEXT NOT NULL DEFAULT 'active',
+    config JSONB NOT NULL DEFAULT '{}'::jsonb,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE UNIQUE INDEX tenants_storage_root_unique
+    ON tenants (storage_root)
+    WHERE storage_root IS NOT NULL;
+
+CREATE UNIQUE INDEX tenants_quickwit_index_unique
+    ON tenants (quickwit_index)
+    WHERE quickwit_index IS NOT NULL;
+
+CREATE TABLE users (
+    id UUID PRIMARY KEY,
+    username VARCHAR(100) NOT NULL UNIQUE,
+    password_hash VARCHAR(255) NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE user_memberships (
+    id UUID PRIMARY KEY,
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
+    role TEXT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE (user_id, tenant_id)
+);
+
+CREATE INDEX user_memberships_tenant_id_idx ON user_memberships (tenant_id);
+CREATE INDEX user_memberships_user_id_idx ON user_memberships (user_id);
+
+CREATE TABLE folders (
+    id UUID PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    parent_id UUID REFERENCES folders(id) ON DELETE SET NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    tenant_id UUID NOT NULL REFERENCES tenants(id)
+);
+
+CREATE INDEX idx_folders_parent ON folders(parent_id);
+CREATE INDEX folders_tenant_id_idx ON folders(tenant_id);
+CREATE UNIQUE INDEX folders_parent_name_unique_idx
+    ON folders (COALESCE(parent_id, '00000000-0000-0000-0000-000000000000'::uuid), name);
+
+CREATE TABLE documents (
+    id UUID PRIMARY KEY,
+    filename VARCHAR(255) NOT NULL,
+    original_name VARCHAR(255) NOT NULL,
+    content_type VARCHAR(100),
+    folder_id UUID REFERENCES folders(id) ON DELETE SET NULL,
+    uploaded_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    deleted_at TIMESTAMPTZ,
+    metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
+    issued_at TIMESTAMPTZ,
+    title VARCHAR(255) NOT NULL,
+    current_version_id UUID NOT NULL,
+    tenant_id UUID NOT NULL REFERENCES tenants(id)
+);
+
+CREATE INDEX idx_documents_folder ON documents (folder_id);
+CREATE INDEX idx_documents_deleted_at ON documents (deleted_at);
+CREATE INDEX documents_tenant_id_idx ON documents (tenant_id);
+CREATE INDEX idx_documents_current_version_id ON documents (current_version_id);
+
+CREATE INDEX idx_documents_folder_title
+    ON documents (
+        COALESCE(folder_id, '00000000-0000-0000-0000-000000000000'::uuid),
+        title
+    )
+    WHERE deleted_at IS NULL;
+
+CREATE UNIQUE INDEX documents_unique_folder_filename
+    ON documents (
+        COALESCE(folder_id, '00000000-0000-0000-0000-000000000000'::uuid),
+        filename
+    )
+    WHERE deleted_at IS NULL;
+
+CREATE TABLE document_versions (
+    id UUID PRIMARY KEY,
+    document_id UUID NOT NULL REFERENCES documents(id) ON DELETE CASCADE,
+    version_number INT NOT NULL,
+    s3_key VARCHAR(500) NOT NULL,
+    size_bytes BIGINT NOT NULL,
+    checksum VARCHAR(64) NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    operations_summary JSONB NOT NULL DEFAULT '{}'::jsonb,
+    metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
+    tenant_id UUID NOT NULL REFERENCES tenants(id),
+    CONSTRAINT document_versions_unique_version UNIQUE (document_id, version_number)
+);
+
+CREATE INDEX idx_document_versions_document ON document_versions (document_id);
+CREATE INDEX document_versions_tenant_id_idx ON document_versions (tenant_id);
+
+ALTER TABLE documents
+    ADD CONSTRAINT documents_current_version_fk
+    FOREIGN KEY (current_version_id)
+    REFERENCES document_versions(id)
+    DEFERRABLE INITIALLY DEFERRED;
+
+CREATE TABLE tags (
+    id UUID PRIMARY KEY,
+    label VARCHAR(100) NOT NULL UNIQUE,
+    color VARCHAR(7),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    tenant_id UUID NOT NULL REFERENCES tenants(id)
+);
+
+CREATE INDEX tags_tenant_id_idx ON tags (tenant_id);
+
+CREATE TABLE document_tags (
+    document_id UUID NOT NULL REFERENCES documents(id) ON DELETE CASCADE,
+    tag_id UUID NOT NULL REFERENCES tags(id) ON DELETE CASCADE,
+    assigned_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    assigned_by UUID REFERENCES users(id),
+    tenant_id UUID NOT NULL REFERENCES tenants(id),
+    PRIMARY KEY (document_id, tag_id)
+);
+
+CREATE INDEX idx_document_tags_tag ON document_tags (tag_id);
+CREATE INDEX document_tags_tenant_id_idx ON document_tags (tenant_id);
+
+CREATE TABLE correspondents (
+    id UUID PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    tenant_id UUID NOT NULL REFERENCES tenants(id),
+    CONSTRAINT correspondents_name_unique UNIQUE (name)
+);
+
+CREATE INDEX correspondents_tenant_id_idx ON correspondents (tenant_id);
+
+CREATE TABLE document_correspondents (
+    document_id UUID NOT NULL REFERENCES documents(id) ON DELETE CASCADE,
+    correspondent_id UUID NOT NULL REFERENCES correspondents(id) ON DELETE CASCADE,
+    role VARCHAR(32) NOT NULL,
+    assigned_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    assigned_by UUID REFERENCES users(id),
+    tenant_id UUID NOT NULL REFERENCES tenants(id),
+    PRIMARY KEY (document_id, correspondent_id, role),
+    CONSTRAINT document_correspondents_role_check CHECK (role IN ('sender', 'receiver', 'other'))
+);
+
+CREATE INDEX idx_document_correspondents_document ON document_correspondents (document_id);
+CREATE INDEX idx_document_correspondents_correspondent ON document_correspondents (correspondent_id);
+CREATE INDEX idx_document_correspondents_role ON document_correspondents (role);
+CREATE INDEX document_correspondents_tenant_id_idx ON document_correspondents (tenant_id);
+
+CREATE TABLE document_assets (
+    id UUID PRIMARY KEY,
+    document_version_id UUID NOT NULL REFERENCES document_versions(id) ON DELETE CASCADE,
+    asset_type TEXT NOT NULL,
+    mime_type TEXT NOT NULL,
+    metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    cardinality INTEGER,
+    tenant_id UUID NOT NULL REFERENCES tenants(id),
+    CONSTRAINT document_assets_unique UNIQUE (document_version_id, asset_type),
+    CONSTRAINT document_assets_cardinality_positive CHECK (cardinality IS NULL OR cardinality >= 1)
+);
+
+CREATE INDEX idx_document_assets_version ON document_assets (document_version_id);
+CREATE INDEX idx_document_assets_type ON document_assets (asset_type);
+CREATE INDEX document_assets_tenant_id_idx ON document_assets (tenant_id);
+
+CREATE TABLE document_asset_objects (
+    id UUID PRIMARY KEY,
+    asset_id UUID NOT NULL REFERENCES document_assets(id) ON DELETE CASCADE,
+    ordinal INTEGER NOT NULL,
+    s3_key TEXT NOT NULL,
+    metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
+    tenant_id UUID NOT NULL REFERENCES tenants(id),
+    CONSTRAINT document_asset_objects_ordinal_positive CHECK (ordinal >= 1),
+    CONSTRAINT document_asset_objects_asset_ordinal_unique UNIQUE (asset_id, ordinal)
+);
+
+CREATE INDEX idx_document_asset_objects_asset_ordinal
+    ON document_asset_objects (asset_id, ordinal);
+
+CREATE INDEX document_asset_objects_tenant_id_idx
+    ON document_asset_objects (tenant_id);
+
+CREATE TABLE jobs (
+    id UUID PRIMARY KEY,
+    job_type TEXT NOT NULL,
+    payload JSONB NOT NULL,
+    status TEXT NOT NULL DEFAULT 'queued',
+    attempts INTEGER NOT NULL DEFAULT 0,
+    run_after TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    last_error TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    tenant_id UUID NOT NULL REFERENCES tenants(id),
+    CONSTRAINT jobs_status_check CHECK (status IN ('queued', 'processing', 'succeeded', 'failed'))
+);
+
+CREATE INDEX idx_jobs_status_run_after ON jobs (status, run_after);
+CREATE INDEX idx_jobs_job_type ON jobs (job_type);
+CREATE INDEX jobs_tenant_id_idx ON jobs (tenant_id);
+
+CREATE OR REPLACE FUNCTION touch_jobs_updated_at()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = NOW();
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_jobs_updated_at
+BEFORE UPDATE ON jobs
+FOR EACH ROW
+EXECUTE FUNCTION touch_jobs_updated_at();
+
+CREATE TABLE refresh_tokens (
+    id UUID PRIMARY KEY,
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    token_hash TEXT NOT NULL,
+    issued_at TIMESTAMPTZ NOT NULL,
+    expires_at TIMESTAMPTZ NOT NULL,
+    revoked_at TIMESTAMPTZ,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    tenant_id UUID NOT NULL REFERENCES tenants(id)
+);
+
+CREATE INDEX idx_refresh_tokens_user_id ON refresh_tokens (user_id);
+CREATE INDEX idx_refresh_tokens_token_hash ON refresh_tokens (token_hash);
+CREATE INDEX refresh_tokens_tenant_id_idx ON refresh_tokens (tenant_id);

backend/migrations/202512010000_update_folder_unique_index/down.sql

@@ -0,0 +1,6 @@
+DROP INDEX IF EXISTS folders_tenant_parent_name_unique_idx;
+CREATE UNIQUE INDEX folders_parent_name_unique_idx
+    ON folders (
+        COALESCE(parent_id, '00000000-0000-0000-0000-000000000000'::uuid),
+        name
+    );

backend/migrations/202512010000_update_folder_unique_index/up.sql

@@ -0,0 +1,7 @@
+DROP INDEX IF EXISTS folders_parent_name_unique_idx;
+CREATE UNIQUE INDEX folders_tenant_parent_name_unique_idx
+    ON folders (
+        tenant_id,
+        COALESCE(parent_id, '00000000-0000-0000-0000-000000000000'::uuid),
+        name
+    );

backend/migrations/202512010010_update_tenant_unique_indexes/down.sql

@@ -0,0 +1,16 @@
+-- Revert correspondent uniqueness to global name
+DROP INDEX IF EXISTS correspondents_tenant_name_unique;
+ALTER TABLE correspondents ADD CONSTRAINT correspondents_name_unique UNIQUE (name);
+
+-- Revert tag uniqueness to global label
+DROP INDEX IF EXISTS tags_tenant_label_unique;
+ALTER TABLE tags ADD CONSTRAINT tags_label_key UNIQUE (label);
+
+-- Revert document filename uniqueness to global folder scope
+DROP INDEX IF EXISTS documents_tenant_folder_filename_unique;
+CREATE UNIQUE INDEX documents_unique_folder_filename
+    ON documents (
+        COALESCE(folder_id, '00000000-0000-0000-0000-000000000000'::uuid),
+        filename
+    )
+    WHERE deleted_at IS NULL;

backend/migrations/202512010010_update_tenant_unique_indexes/up.sql

@@ -0,0 +1,20 @@
+-- Ensure document filenames are unique per tenant + folder
+DROP INDEX IF EXISTS documents_tenant_folder_filename_unique;
+DROP INDEX IF EXISTS documents_unique_folder_filename;
+CREATE UNIQUE INDEX documents_tenant_folder_filename_unique
+    ON documents (
+        tenant_id,
+        COALESCE(folder_id, '00000000-0000-0000-0000-000000000000'::uuid),
+        filename
+    )
+    WHERE deleted_at IS NULL;
+
+-- Ensure tag labels are unique per tenant
+ALTER TABLE tags DROP CONSTRAINT IF EXISTS tags_label_key;
+DROP INDEX IF EXISTS tags_tenant_label_unique;
+CREATE UNIQUE INDEX tags_tenant_label_unique ON tags (tenant_id, label);
+
+-- Ensure correspondent names are unique per tenant
+ALTER TABLE correspondents DROP CONSTRAINT IF EXISTS correspondents_name_unique;
+DROP INDEX IF EXISTS correspondents_tenant_name_unique;
+CREATE UNIQUE INDEX correspondents_tenant_name_unique ON correspondents (tenant_id, name);

backend/migrations/202512010020_drop_document_version_operations_summary/down.sql

@@ -0,0 +1,2 @@
+ALTER TABLE document_versions
+    ADD COLUMN operations_summary JSONB NOT NULL DEFAULT '{}'::jsonb;

backend/migrations/202512010020_drop_document_version_operations_summary/up.sql

@@ -0,0 +1,2 @@
+ALTER TABLE document_versions
+    DROP COLUMN IF EXISTS operations_summary;

backend/migrations/202512010050_drop_correspondent_roles/down.sql

@@ -0,0 +1,7 @@
+ALTER TABLE document_correspondents DROP CONSTRAINT document_correspondents_pkey;
+ALTER TABLE document_correspondents ADD COLUMN role VARCHAR(32) NOT NULL DEFAULT 'other';
+UPDATE document_correspondents SET role = 'other';
+ALTER TABLE document_correspondents ALTER COLUMN role DROP DEFAULT;
+ALTER TABLE document_correspondents
+    ADD CONSTRAINT document_correspondents_pkey
+    PRIMARY KEY (document_id, correspondent_id, role);

backend/migrations/202512010050_drop_correspondent_roles/up.sql

@@ -0,0 +1,24 @@
+WITH ranked AS (
+    SELECT
+        document_id,
+        correspondent_id,
+        role,
+        assigned_at,
+        assigned_by,
+        tenant_id,
+        ROW_NUMBER() OVER (PARTITION BY document_id, correspondent_id ORDER BY assigned_at DESC) AS rn
+    FROM document_correspondents
+)
+DELETE FROM document_correspondents dc
+USING ranked r
+WHERE dc.document_id = r.document_id
+  AND dc.correspondent_id = r.correspondent_id
+  AND dc.role = r.role
+  AND dc.tenant_id = r.tenant_id
+  AND r.rn > 1;
+
+ALTER TABLE document_correspondents DROP CONSTRAINT document_correspondents_pkey;
+ALTER TABLE document_correspondents DROP COLUMN role;
+ALTER TABLE document_correspondents
+    ADD CONSTRAINT document_correspondents_pkey
+    PRIMARY KEY (document_id, correspondent_id);

backend/migrations/202512010100_add_webdav_tokens/down.sql

@@ -0,0 +1,3 @@
+DROP INDEX IF EXISTS webdav_tokens_user_tenant_idx;
+DROP INDEX IF EXISTS webdav_tokens_token_prefix_key;
+DROP TABLE IF EXISTS webdav_tokens;

backend/migrations/202512010100_add_webdav_tokens/up.sql

@@ -0,0 +1,16 @@
+CREATE TABLE webdav_tokens (
+    id UUID PRIMARY KEY,
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
+    token_prefix TEXT NOT NULL,
+    token_hash TEXT NOT NULL,
+    label TEXT,
+    scopes JSONB NOT NULL DEFAULT '["webdav"]'::jsonb,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    last_used_at TIMESTAMPTZ,
+    expires_at TIMESTAMPTZ,
+    revoked_at TIMESTAMPTZ
+);
+
+CREATE UNIQUE INDEX webdav_tokens_token_prefix_key ON webdav_tokens(token_prefix);
+CREATE INDEX webdav_tokens_user_tenant_idx ON webdav_tokens(user_id, tenant_id);

backend/migrations/202512010110_drop_webdav_token_scopes/down.sql

@@ -0,0 +1,2 @@
+ALTER TABLE webdav_tokens
+    ADD COLUMN scopes JSONB NOT NULL DEFAULT '["webdav"]'::jsonb;

backend/migrations/202512010110_drop_webdav_token_scopes/up.sql

@@ -0,0 +1,2 @@
+ALTER TABLE webdav_tokens
+    DROP COLUMN IF EXISTS scopes;

backend/src/auth/jwt.rs

@@ -15,6 +15,8 @@ pub struct JwtService {
     expiry: Duration,
     download_audience: String,
     download_expiry: Duration,
+    selector_audience: String,
+    selector_expiry: Duration,
 }
 
 impl JwtService {
@@ -27,16 +29,18 @@ impl JwtService {
             expiry: Duration::minutes(config.jwt_expiry_minutes),
             download_audience: config.download_token_audience.clone(),
             download_expiry: Duration::minutes(config.download_token_expiry_minutes),
+            selector_audience: format!("{}:tenant-selector", config.jwt_audience),
+            selector_expiry: Duration::minutes(15),
         })
     }
 
-    pub fn generate_token(&self, user_id: Uuid, username: &str, role: &str) -> Result<String> {
+    pub fn generate_token(&self, user_id: Uuid, tenant_id: Uuid, username: &str) -> Result<String> {
         let now = Utc::now();
         let exp = now + self.expiry;
         let claims = Claims {
             sub: user_id,
+            tenant_id,
             username: username.to_owned(),
-            role: role.to_owned(),
             iss: self.issuer.clone(),
             aud: self.audience.clone(),
             iat: now.timestamp() as usize,
@@ -54,12 +58,18 @@ impl JwtService {
         Ok(data.claims)
     }
 
-    pub fn generate_download_token(&self, document_id: Uuid, user_id: Uuid) -> Result<String> {
+    pub fn generate_download_token(
+        &self,
+        document_id: Uuid,
+        user_id: Uuid,
+        tenant_id: Uuid,
+    ) -> Result<String> {
         let now = Utc::now();
         let exp = now + self.download_expiry;
         let claims = DownloadClaims {
             doc_id: document_id,
             user_id,
+            tenant_id,
             iss: self.issuer.clone(),
             aud: self.download_audience.clone(),
             iat: now.timestamp() as usize,
@@ -76,13 +86,35 @@ impl JwtService {
         let data = decode::<DownloadClaims>(token, &self.decoding, &validation)?;
         Ok(data.claims)
     }
+
+    pub fn generate_tenant_selector_token(&self, user_id: Uuid) -> Result<String> {
+        let now = Utc::now();
+        let exp = now + self.selector_expiry;
+        let claims = TenantSelectionClaims {
+            sub: user_id,
+            iss: self.issuer.clone(),
+            aud: self.selector_audience.clone(),
+            iat: now.timestamp() as usize,
+            exp: exp.timestamp() as usize,
+        };
+
+        Ok(encode(&Header::default(), &claims, &self.encoding)?)
+    }
+
+    pub fn verify_tenant_selector_token(&self, token: &str) -> Result<TenantSelectionClaims> {
+        let mut validation = Validation::default();
+        validation.set_audience(&[self.selector_audience.clone()]);
+        validation.set_issuer(&[self.issuer.clone()]);
+        let data = decode::<TenantSelectionClaims>(token, &self.decoding, &validation)?;
+        Ok(data.claims)
+    }
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct Claims {
     pub sub: Uuid,
+    pub tenant_id: Uuid,
     pub username: String,
-    pub role: String,
     pub iss: String,
     pub aud: String,
     pub iat: usize,
@@ -93,6 +125,16 @@ pub struct Claims {
 pub struct DownloadClaims {
     pub doc_id: Uuid,
     pub user_id: Uuid,
+    pub tenant_id: Uuid,
+    pub iss: String,
+    pub aud: String,
+    pub iat: usize,
+    pub exp: usize,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct TenantSelectionClaims {
+    pub sub: Uuid,
     pub iss: String,
     pub aud: String,
     pub iat: usize,

backend/src/auth/mod.rs

@@ -1,18 +1,23 @@
 pub mod jwt;
 pub mod password;
+pub mod webdav_tokens;
 
 use axum::{async_trait, extract::FromRequestParts, http::request::Parts};
 use axum_extra::headers::{authorization::Bearer, Authorization};
 use axum_extra::TypedHeader;
 use serde::{Deserialize, Serialize};
 
-use crate::{error::AppError, state::AppState};
+use crate::{
+    error::AppError,
+    state::{AppState, PgPooledConnection},
+};
+use uuid::Uuid;
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct AuthenticatedUser {
     pub user_id: uuid::Uuid,
     pub username: String,
-    pub role: String,
+    pub tenant_id: uuid::Uuid,
 }
 
 #[async_trait]
@@ -23,6 +28,10 @@ impl FromRequestParts<AppState> for AuthenticatedUser {
         parts: &mut Parts,
         state: &AppState,
     ) -> Result<Self, Self::Rejection> {
+        if let Some(user) = parts.extensions.get::<AuthenticatedUser>() {
+            return Ok(user.clone());
+        }
+
         let TypedHeader(Authorization(bearer)) =
             TypedHeader::<Authorization<Bearer>>::from_request_parts(parts, state)
                 .await
@@ -33,10 +42,48 @@ impl FromRequestParts<AppState> for AuthenticatedUser {
             .verify_token(bearer.token())
             .map_err(|_| AppError::unauthorized())?;
 
-        Ok(AuthenticatedUser {
+        let user = AuthenticatedUser {
             user_id: claims.sub,
             username: claims.username,
-            role: claims.role,
+            tenant_id: claims.tenant_id,
+        };
+
+        parts.extensions.insert(user.clone());
+
+        Ok(user)
+    }
+}
+
+pub struct TenantScopedConn {
+    pub conn: PgPooledConnection,
+    pub tenant_id: Uuid,
+    pub user_id: Uuid,
+    pub user: AuthenticatedUser,
+}
+
+impl TenantScopedConn {
+    pub fn conn(&mut self) -> &mut PgPooledConnection {
+        &mut self.conn
+    }
+}
+
+#[async_trait]
+impl FromRequestParts<AppState> for TenantScopedConn {
+    type Rejection = AppError;
+
+    async fn from_request_parts(
+        parts: &mut Parts,
+        state: &AppState,
+    ) -> Result<Self, Self::Rejection> {
+        let user = AuthenticatedUser::from_request_parts(parts, state).await?;
+        let tenant_id = user.tenant_id;
+        let conn = state.db_for_tenant(tenant_id)?;
+
+        Ok(Self {
+            conn,
+            tenant_id,
+            user_id: user.user_id,
+            user,
         })
     }
 }

backend/src/auth/webdav_tokens.rs

@@ -0,0 +1,184 @@
+use argon2::{
+    password_hash::{PasswordHasher, SaltString},
+    Argon2,
+};
+use chrono::{NaiveDateTime, Utc};
+use diesel::prelude::*;
+use rand::rngs::OsRng;
+use rand::RngCore;
+use uuid::Uuid;
+
+use crate::{
+    error::AppError,
+    models::{NewWebdavToken, WebdavToken},
+    schema::webdav_tokens,
+    state::PgPooledConnection,
+};
+
+const TOKEN_PREFIX_LENGTH: usize = 12;
+const TOKEN_SECRET_LENGTH: usize = 32;
+
+pub struct IssuedWebdavToken {
+    pub token: String,
+    pub record: WebdavToken,
+}
+
+pub fn create_webdav_token(
+    conn: &mut PgPooledConnection,
+    user_id: Uuid,
+    tenant_id: Uuid,
+    label: Option<String>,
+    expires_at: Option<NaiveDateTime>,
+) -> Result<IssuedWebdavToken, AppError> {
+    let raw_secret = generate_secret()?;
+    let token_prefix = raw_secret[..TOKEN_PREFIX_LENGTH].to_string();
+    let token_hash = hash_secret(&raw_secret)?;
+    let new_token = NewWebdavToken {
+        id: Uuid::new_v4(),
+        user_id,
+        tenant_id,
+        token_prefix,
+        token_hash,
+        label,
+        expires_at,
+    };
+
+    let record = diesel::insert_into(webdav_tokens::table)
+        .values(&new_token)
+        .get_result::<WebdavToken>(conn)?;
+
+    Ok(IssuedWebdavToken {
+        token: raw_secret,
+        record,
+    })
+}
+
+pub fn list_webdav_tokens(
+    conn: &mut PgPooledConnection,
+    user_id: Uuid,
+    tenant_id: Option<Uuid>,
+) -> Result<Vec<WebdavToken>, AppError> {
+    let mut query = webdav_tokens::table
+        .filter(webdav_tokens::user_id.eq(user_id))
+        .into_boxed();
+
+    if let Some(tenant_id) = tenant_id {
+        query = query.filter(webdav_tokens::tenant_id.eq(tenant_id));
+    }
+
+    let tokens = query
+        .order(webdav_tokens::created_at.asc())
+        .load::<WebdavToken>(conn)?;
+
+    Ok(tokens)
+}
+
+pub fn find_active_token_by_secret(
+    conn: &mut PgPooledConnection,
+    user_id: Uuid,
+    tenant_id: Option<Uuid>,
+    secret: &str,
+) -> Result<Option<WebdavToken>, AppError> {
+    if secret.len() < TOKEN_PREFIX_LENGTH {
+        return Ok(None);
+    }
+
+    let prefix = &secret[..TOKEN_PREFIX_LENGTH];
+    let mut query = webdav_tokens::table
+        .filter(webdav_tokens::user_id.eq(user_id))
+        .filter(webdav_tokens::token_prefix.eq(prefix))
+        .filter(webdav_tokens::revoked_at.is_null())
+        .into_boxed();
+
+    let now = Utc::now().naive_utc();
+    query = query.filter(
+        webdav_tokens::expires_at
+            .is_null()
+            .or(webdav_tokens::expires_at.gt(now)),
+    );
+
+    if let Some(tenant_id) = tenant_id {
+        query = query.filter(webdav_tokens::tenant_id.eq(tenant_id));
+    }
+
+    let candidates = query.load::<WebdavToken>(conn)?;
+
+    for token in candidates {
+        if verify_token_secret(secret, &token.token_hash)? {
+            return Ok(Some(token));
+        }
+    }
+
+    Ok(None)
+}
+
+pub fn revoke_webdav_token(
+    conn: &mut PgPooledConnection,
+    token_id: Uuid,
+    user_id: Uuid,
+) -> Result<(), AppError> {
+    let affected = diesel::update(
+        webdav_tokens::table
+            .filter(webdav_tokens::id.eq(token_id))
+            .filter(webdav_tokens::user_id.eq(user_id)),
+    )
+    .set(webdav_tokens::revoked_at.eq(Utc::now().naive_utc()))
+    .execute(conn)?;
+
+    if affected == 0 {
+        return Err(AppError::not_found());
+    }
+
+    Ok(())
+}
+
+pub fn touch_webdav_token(conn: &mut PgPooledConnection, token_id: Uuid) -> Result<(), AppError> {
+    diesel::update(webdav_tokens::table.filter(webdav_tokens::id.eq(token_id)))
+        .set(webdav_tokens::last_used_at.eq(Utc::now().naive_utc()))
+        .execute(conn)?;
+    Ok(())
+}
+
+pub fn verify_token_secret(secret: &str, token_hash: &str) -> Result<bool, AppError> {
+    crate::auth::password::verify_password(secret, token_hash)
+        .map_err(|err| AppError::internal(format!("failed to verify token: {err}")))
+}
+
+fn generate_secret() -> Result<String, AppError> {
+    let mut buffer = [0u8; TOKEN_SECRET_LENGTH];
+    OsRng
+        .try_fill_bytes(&mut buffer)
+        .map_err(|err| AppError::internal(format!("failed to generate token: {err}")))?;
+    Ok(hex::encode(buffer))
+}
+
+fn hash_secret(secret: &str) -> Result<String, AppError> {
+    let salt = SaltString::generate(&mut OsRng);
+    let hash = Argon2::default()
+        .hash_password(secret.as_bytes(), &salt)
+        .map_err(|err| AppError::internal(format!("failed to hash token: {err}")))?;
+    Ok(hash.to_string())
+}
+
+fn _ensure_constants() {
+    assert!(TOKEN_PREFIX_LENGTH < TOKEN_SECRET_LENGTH * 2);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn generated_secret_has_expected_length() {
+        let secret = generate_secret().unwrap();
+        assert_eq!(secret.len(), TOKEN_SECRET_LENGTH * 2);
+    }
+
+    #[test]
+    fn hash_and_verify_secret_round_trip() {
+        let secret = generate_secret().unwrap();
+        let hash = hash_secret(&secret).unwrap();
+        assert!(verify_token_secret(&secret, &hash).unwrap());
+        assert!(!verify_token_secret("wrong", &hash).unwrap());
+    }
+}

backend/src/bin/admin.rs

@@ -0,0 +1,707 @@
+use std::env;
+use std::sync::Arc;
+
+use anyhow::{anyhow, bail, Context, Result};
+use argon2::{
+    password_hash::{PasswordHasher, SaltString},
+    Argon2,
+};
+use diesel::{dsl::exists, prelude::*, select};
+use once_cell::sync::Lazy;
+use reqwest::{Client, Method, StatusCode};
+use serde_json::json;
+use uuid::Uuid;
+
+use backend::{
+    config::AppConfig,
+    db::{self, PgPool},
+    jobs::{enqueue_job, JOB_ANALYZE_DOCUMENT},
+    models::{DocumentAsset, DocumentAssetObject, NewUser, NewUserMembership, Tenant, User},
+    s3,
+    schema::{
+        document_asset_objects, document_assets, documents, tenants, user_memberships, users,
+    },
+    storage::{ObjectStorage, S3Storage, TenantStorage},
+    utils::tracing::init_tracing,
+};
+
+use rand::rngs::OsRng;
+
+static QUICKWIT_INDEX_TEMPLATE: Lazy<serde_json::Value> = Lazy::new(|| {
+    json!({
+        "version": "0.8",
+        "index_id": "documents",
+        "doc_mapping": {
+            "tokenizers": [
+                {
+                    "name": "substring",
+                    "type": "ngram",
+                    "min_gram": 2,
+                    "max_gram": 20,
+                    "prefix_only": false
+                }
+            ],
+            "field_mappings": [
+                { "name": "tenant_id", "type": "text", "stored": true },
+                { "name": "document_id", "type": "text", "stored": true },
+                { "name": "version_id", "type": "text", "stored": true },
+                { "name": "title", "type": "text", "tokenizer": "substring", "stored": true },
+                { "name": "text", "type": "text", "tokenizer": "substring", "record": "position" }
+            ]
+        },
+        "search_settings": {
+            "default_search_fields": ["title", "text"]
+        }
+    })
+});
+
+#[derive(Debug)]
+enum Command {
+    CreateUser {
+        username: String,
+        password: String,
+    },
+    SetPassword {
+        username: String,
+        password: String,
+    },
+    ListUsers,
+    DeleteUser {
+        username: String,
+    },
+    CreateTenant {
+        slug: String,
+        storage_root: Option<String>,
+        quickwit_index: Option<String>,
+    },
+    DeleteTenant {
+        slug: String,
+    },
+    AddUserToTenant {
+        username: String,
+        slug: String,
+        role: Option<String>,
+    },
+    RemoveUserFromTenant {
+        username: String,
+        slug: String,
+    },
+    ReanalyzeDocuments {
+        slug: String,
+    },
+    ListTenants,
+    DeleteAssets(String),
+    QuickwitCreate(String),
+    QuickwitDelete(String),
+}
+
+impl Command {
+    fn usage() -> &'static str {
+        "Usage: admin\n\
+            create-user <username> <password>\n\
+            set-password <username> <password>\n\
+            list-users\n\
+            delete-user <username>\n\
+            create-tenant <slug> [storage_root] [quickwit_index]\n\
+            delete-tenant <slug>\n\
+            add-user-to-tenant <username> <slug> [role]\n\
+            remove-user-from-tenant <username> <slug>\n\
+            reanalyze-documents <slug>\n\
+            list-tenants\n\
+            delete-assets <slug>\n\
+            quickwit-create-index <slug>\n\
+            quickwit-delete-index <slug>"
+    }
+
+    fn parse() -> Result<Self> {
+        let mut args = env::args().skip(1);
+        match args.next().as_deref() {
+            Some("create-user") => Ok(Self::CreateUser {
+                username: args.next().ok_or_else(|| anyhow!("username required"))?,
+                password: args.next().ok_or_else(|| anyhow!("password required"))?,
+            }),
+            Some("set-password") => Ok(Self::SetPassword {
+                username: args.next().ok_or_else(|| anyhow!("username required"))?,
+                password: args.next().ok_or_else(|| anyhow!("password required"))?,
+            }),
+            Some("list-users") => Ok(Self::ListUsers),
+            Some("delete-user") => Ok(Self::DeleteUser {
+                username: args.next().ok_or_else(|| anyhow!("username required"))?,
+            }),
+            Some("create-tenant") => Ok(Self::CreateTenant {
+                slug: args.next().ok_or_else(|| anyhow!("tenant slug required"))?,
+                storage_root: args.next(),
+                quickwit_index: args.next(),
+            }),
+            Some("delete-tenant") => Ok(Self::DeleteTenant {
+                slug: args.next().ok_or_else(|| anyhow!("tenant slug required"))?,
+            }),
+            Some("add-user-to-tenant") => Ok(Self::AddUserToTenant {
+                username: args.next().ok_or_else(|| anyhow!("username required"))?,
+                slug: args.next().ok_or_else(|| anyhow!("tenant slug required"))?,
+                role: args.next(),
+            }),
+            Some("remove-user-from-tenant") => Ok(Self::RemoveUserFromTenant {
+                username: args.next().ok_or_else(|| anyhow!("username required"))?,
+                slug: args.next().ok_or_else(|| anyhow!("tenant slug required"))?,
+            }),
+            Some("reanalyze-documents") => Ok(Self::ReanalyzeDocuments {
+                slug: args.next().ok_or_else(|| anyhow!("tenant slug required"))?,
+            }),
+            Some("list-tenants") => Ok(Self::ListTenants),
+            Some("delete-assets") => Ok(Self::DeleteAssets(
+                args.next().ok_or_else(|| anyhow!("tenant slug required"))?,
+            )),
+            Some("quickwit-create-index") => Ok(Self::QuickwitCreate(
+                args.next().ok_or_else(|| anyhow!("tenant slug required"))?,
+            )),
+            Some("quickwit-delete-index") => Ok(Self::QuickwitDelete(
+                args.next().ok_or_else(|| anyhow!("tenant slug required"))?,
+            )),
+            _ => Err(anyhow!(Self::usage())),
+        }
+    }
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    init_tracing("info");
+    let command = Command::parse()?;
+    let config = AppConfig::load_and_log("admin")?;
+    let pool = db::init_pool_with_size(&config.database_url, config.database_max_pool_size)?;
+
+    match command {
+        Command::CreateUser { username, password } => create_user(&pool, &username, &password)?,
+        Command::SetPassword { username, password } => set_password(&pool, &username, &password)?,
+        Command::ListUsers => list_users(&pool)?,
+        Command::DeleteUser { username } => delete_user(&pool, &username)?,
+        Command::CreateTenant {
+            slug,
+            storage_root,
+            quickwit_index,
+        } => create_tenant(&pool, &slug, storage_root, quickwit_index)?,
+        Command::DeleteTenant { slug } => delete_tenant(&pool, &slug)?,
+        Command::AddUserToTenant {
+            username,
+            slug,
+            role,
+        } => add_user_to_tenant(&pool, &username, &slug, role.as_deref())?,
+        Command::RemoveUserFromTenant { username, slug } => {
+            remove_user_from_tenant(&pool, &username, &slug)?
+        }
+        Command::ReanalyzeDocuments { slug } => reanalyze_documents(&pool, &slug)?,
+        Command::ListTenants => list_tenants(&pool)?,
+        Command::DeleteAssets(slug) => delete_assets_for_tenant(&config, &pool, &slug).await?,
+        Command::QuickwitCreate(slug) => {
+            quickwit_index(&config, &pool, &slug, Method::POST).await?
+        }
+        Command::QuickwitDelete(slug) => {
+            quickwit_index(&config, &pool, &slug, Method::DELETE).await?
+        }
+    }
+
+    Ok(())
+}
+
+fn create_user(pool: &PgPool, username: &str, password: &str) -> Result<()> {
+    if username.trim().is_empty() {
+        bail!("username must not be empty");
+    }
+    if password.is_empty() {
+        bail!("password must not be empty");
+    }
+
+    let mut conn = pool.get().context("failed to get database connection")?;
+    let exists: bool =
+        select(exists(users::table.filter(users::username.eq(username)))).get_result(&mut conn)?;
+    if exists {
+        bail!("user '{}' already exists", username);
+    }
+
+    let password_hash = hash_password(password)?;
+    let new_user = NewUser {
+        id: Uuid::new_v4(),
+        username: username.to_string(),
+        password_hash,
+    };
+
+    diesel::insert_into(users::table)
+        .values(&new_user)
+        .execute(&mut conn)?;
+
+    println!("created user '{}' (id: {})", username, new_user.id);
+    Ok(())
+}
+
+fn set_password(pool: &PgPool, username: &str, password: &str) -> Result<()> {
+    if password.is_empty() {
+        bail!("password must not be empty");
+    }
+
+    let mut conn = pool.get().context("failed to get database connection")?;
+    let password_hash = hash_password(password)?;
+
+    let updated = diesel::update(users::table.filter(users::username.eq(username)))
+        .set(users::password_hash.eq(password_hash))
+        .execute(&mut conn)?;
+
+    if updated == 0 {
+        bail!("user '{}' not found", username);
+    }
+
+    println!("updated password for '{}'", username);
+    Ok(())
+}
+
+fn hash_password(password: &str) -> Result<String> {
+    let salt = SaltString::generate(&mut OsRng);
+    let hash = Argon2::default()
+        .hash_password(password.as_bytes(), &salt)
+        .map_err(|err| anyhow!(err))?;
+    Ok(hash.to_string())
+}
+
+fn list_users(pool: &PgPool) -> Result<()> {
+    let mut conn = pool.get().context("failed to get database connection")?;
+
+    let users_list: Vec<User> = users::table.order(users::username.asc()).load(&mut conn)?;
+    if users_list.is_empty() {
+        println!("No users found.");
+        return Ok(());
+    }
+
+    for user in users_list {
+        let memberships: Vec<(Uuid, String, String)> = user_memberships::table
+            .inner_join(tenants::table)
+            .filter(user_memberships::user_id.eq(user.id))
+            .select((tenants::id, tenants::slug, user_memberships::role))
+            .order((tenants::slug.asc(), user_memberships::role.asc()))
+            .load(&mut conn)?;
+
+        if memberships.is_empty() {
+            println!("{} ({})", user.username, user.id);
+        } else {
+            let details: Vec<String> = memberships
+                .into_iter()
+                .map(|(_, slug, role)| format!("{}: {}", slug, role))
+                .collect();
+            println!("{} ({}) -> {}", user.username, user.id, details.join(", "));
+        }
+    }
+
+    Ok(())
+}
+
+fn delete_user(pool: &PgPool, username: &str) -> Result<()> {
+    let mut conn = pool.get().context("failed to get database connection")?;
+
+    let user: User = users::table
+        .filter(users::username.eq(username))
+        .first(&mut conn)
+        .optional()?
+        .ok_or_else(|| anyhow!("user '{}' not found", username))?;
+
+    diesel::delete(user_memberships::table.filter(user_memberships::user_id.eq(user.id)))
+        .execute(&mut conn)?;
+    diesel::delete(users::table.filter(users::id.eq(user.id))).execute(&mut conn)?;
+
+    println!("deleted user '{}'", username);
+    Ok(())
+}
+
+fn create_tenant(
+    pool: &PgPool,
+    slug: &str,
+    storage_root_arg: Option<String>,
+    quickwit_index_arg: Option<String>,
+) -> Result<()> {
+    if slug.trim().is_empty() {
+        bail!("tenant slug must not be empty");
+    }
+
+    let mut conn = pool.get().context("failed to get database connection")?;
+    let exists: bool =
+        select(exists(tenants::table.filter(tenants::slug.eq(slug)))).get_result(&mut conn)?;
+    if exists {
+        bail!("tenant '{}' already exists", slug);
+    }
+
+    let id = Uuid::new_v4();
+    let storage_root = storage_root_arg
+        .map(|mut s| {
+            if s.is_empty() {
+                format!("tenants/{}/", id)
+            } else {
+                if !s.ends_with('/') {
+                    s.push('/');
+                }
+                s
+            }
+        })
+        .unwrap_or_else(|| format!("tenants/{}/", id));
+    let quickwit_index = quickwit_index_arg.unwrap_or_else(|| format!("documents-{}", id));
+
+    diesel::insert_into(tenants::table)
+        .values((
+            tenants::id.eq(id),
+            tenants::slug.eq(slug),
+            tenants::storage_root.eq(Some(storage_root.clone())),
+            tenants::quickwit_index.eq(Some(quickwit_index.clone())),
+            tenants::status.eq("active"),
+            tenants::config.eq(serde_json::json!({})),
+        ))
+        .execute(&mut conn)?;
+
+    println!(
+        "created tenant '{}' with id {}, storage_root '{}', quickwit_index '{}'",
+        slug, id, storage_root, quickwit_index
+    );
+    Ok(())
+}
+
+fn delete_tenant(pool: &PgPool, slug: &str) -> Result<()> {
+    let mut conn = pool.get().context("failed to get database connection")?;
+
+    let tenant: Tenant = tenants::table
+        .filter(tenants::slug.eq(slug))
+        .first(&mut conn)
+        .optional()?
+        .ok_or_else(|| anyhow!("tenant '{}' not found", slug))?;
+
+    let member_exists: bool = select(exists(
+        user_memberships::table.filter(user_memberships::tenant_id.eq(tenant.id)),
+    ))
+    .get_result(&mut conn)?;
+    if member_exists {
+        bail!("tenant '{}' still has user memberships", slug);
+    }
+
+    diesel::delete(tenants::table.filter(tenants::id.eq(tenant.id))).execute(&mut conn)?;
+    println!("deleted tenant '{}'", slug);
+    Ok(())
+}
+
+fn add_user_to_tenant(pool: &PgPool, username: &str, slug: &str, role: Option<&str>) -> Result<()> {
+    let mut conn = pool.get().context("failed to get database connection")?;
+
+    let user: User = users::table
+        .filter(users::username.eq(username))
+        .first(&mut conn)
+        .optional()?
+        .ok_or_else(|| anyhow!("user '{}' not found", username))?;
+
+    let tenant: Tenant = tenants::table
+        .filter(tenants::slug.eq(slug))
+        .first(&mut conn)
+        .optional()?
+        .ok_or_else(|| anyhow!("tenant '{}' not found", slug))?;
+
+    let membership = NewUserMembership {
+        id: Uuid::new_v4(),
+        user_id: user.id,
+        tenant_id: tenant.id,
+        role: role.unwrap_or("user").to_string(),
+    };
+
+    diesel::insert_into(user_memberships::table)
+        .values(&membership)
+        .on_conflict((user_memberships::user_id, user_memberships::tenant_id))
+        .do_update()
+        .set(user_memberships::role.eq(&membership.role))
+        .execute(&mut conn)?;
+
+    println!(
+        "added user '{}' to tenant '{}' with role '{}'",
+        username, slug, membership.role
+    );
+    Ok(())
+}
+
+fn remove_user_from_tenant(pool: &PgPool, username: &str, slug: &str) -> Result<()> {
+    let mut conn = pool.get().context("failed to get database connection")?;
+
+    let user: User = users::table
+        .filter(users::username.eq(username))
+        .first(&mut conn)
+        .optional()?
+        .ok_or_else(|| anyhow!("user '{}' not found", username))?;
+
+    let tenant: Tenant = tenants::table
+        .filter(tenants::slug.eq(slug))
+        .first(&mut conn)
+        .optional()?
+        .ok_or_else(|| anyhow!("tenant '{}' not found", slug))?;
+
+    let removed = diesel::delete(
+        user_memberships::table
+            .filter(user_memberships::user_id.eq(user.id))
+            .filter(user_memberships::tenant_id.eq(tenant.id)),
+    )
+    .execute(&mut conn)?;
+
+    if removed == 0 {
+        println!("user '{}' was not a member of tenant '{}'", username, slug);
+    } else {
+        println!("removed user '{}' from tenant '{}'", username, slug);
+    }
+    Ok(())
+}
+
+fn reanalyze_documents(pool: &PgPool, slug: &str) -> Result<()> {
+    let mut conn = pool.get().context("failed to get database connection")?;
+
+    let tenant: Tenant = tenants::table
+        .filter(tenants::slug.eq(slug))
+        .first(&mut conn)
+        .optional()?
+        .ok_or_else(|| anyhow!("tenant '{}' not found", slug))?;
+
+    let targets: Vec<(Uuid, Uuid)> = documents::table
+        .filter(documents::tenant_id.eq(tenant.id))
+        .filter(documents::deleted_at.is_null())
+        .select((documents::id, documents::current_version_id))
+        .load(&mut conn)?;
+
+    if targets.is_empty() {
+        println!("tenant '{}' has no active documents", slug);
+        return Ok(());
+    }
+
+    let mut queued = 0usize;
+    for (document_id, version_id) in targets {
+        enqueue_job(
+            &mut conn,
+            tenant.id,
+            JOB_ANALYZE_DOCUMENT,
+            serde_json::json!({
+                "document_id": document_id,
+                "document_version_id": version_id,
+                "force": true,
+            }),
+            None,
+        )
+        .map_err(|err| anyhow!("failed to enqueue analyze job: {}", err))?;
+        queued += 1;
+    }
+
+    println!(
+        "queued {} documents for re-analysis in tenant '{}'",
+        queued, slug
+    );
+    Ok(())
+}
+
+fn list_tenants(pool: &PgPool) -> Result<()> {
+    let mut conn = pool.get().context("failed to get database connection")?;
+    let tenants: Vec<Tenant> = tenants::table
+        .order(tenants::slug.asc())
+        .load(&mut conn)
+        .context("failed to load tenants")?;
+
+    if tenants.is_empty() {
+        println!("No tenants found.");
+        return Ok(());
+    }
+
+    for tenant in tenants {
+        println!("{} ({})", tenant.slug, tenant.id);
+    }
+
+    Ok(())
+}
+
+async fn delete_assets_for_tenant(
+    config: &AppConfig,
+    pool: &PgPool,
+    tenant_slug: &str,
+) -> Result<()> {
+    let s3_client = s3::build_client(config).await?;
+    let storage: Arc<dyn ObjectStorage> =
+        Arc::new(S3Storage::new(s3_client, config.s3_bucket.clone()));
+
+    let mut conn = pool.get().context("failed to get database connection")?;
+    let tenant: Tenant = tenants::table
+        .filter(tenants::slug.eq(tenant_slug))
+        .first(&mut conn)
+        .optional()
+        .context("failed to load tenant")?
+        .ok_or_else(|| anyhow!("tenant '{}' not found", tenant_slug))?;
+
+    let tenant_storage = TenantStorage::new(Arc::clone(&storage), &tenant)
+        .with_context(|| format!("missing storage root for tenant {}", tenant.slug))?;
+
+    let assets: Vec<DocumentAsset> = document_assets::table
+        .filter(document_assets::tenant_id.eq(tenant.id))
+        .load(&mut conn)
+        .with_context(|| format!("failed to load assets for tenant {}", tenant.slug))?;
+
+    if assets.is_empty() {
+        println!("Tenant {}: no assets", tenant.slug);
+        return Ok(());
+    }
+
+    println!(
+        "Tenant {} ({}): deleting {} assets…",
+        tenant.slug,
+        tenant.id,
+        assets.len()
+    );
+
+    let asset_ids: Vec<Uuid> = assets.iter().map(|asset| asset.id).collect();
+
+    let objects: Vec<DocumentAssetObject> = document_asset_objects::table
+        .filter(document_asset_objects::tenant_id.eq(tenant.id))
+        .filter(document_asset_objects::asset_id.eq_any(&asset_ids))
+        .load(&mut conn)
+        .with_context(|| format!("failed to load asset objects for tenant {}", tenant.slug))?;
+
+    for object in &objects {
+        if let Err(err) = tenant_storage.delete_object(&object.s3_key).await {
+            eprintln!(
+                "Failed to delete object {} (tenant {}): {err}",
+                object.s3_key, tenant.slug
+            );
+        }
+    }
+
+    diesel::delete(
+        document_asset_objects::table
+            .filter(document_asset_objects::tenant_id.eq(tenant.id))
+            .filter(document_asset_objects::asset_id.eq_any(&asset_ids)),
+    )
+    .execute(&mut conn)
+    .with_context(|| format!("failed to remove asset objects for tenant {}", tenant.slug))?;
+
+    diesel::delete(document_assets::table.filter(document_assets::tenant_id.eq(tenant.id)))
+        .execute(&mut conn)
+        .with_context(|| format!("failed to remove asset records for tenant {}", tenant.slug))?;
+
+    println!("Tenant {}: asset records deleted.", tenant.slug);
+    Ok(())
+}
+
+async fn quickwit_index(
+    config: &AppConfig,
+    pool: &PgPool,
+    slug: &str,
+    method: Method,
+) -> Result<()> {
+    let endpoint = config
+        .quickwit_endpoint
+        .as_ref()
+        .ok_or_else(|| anyhow!("quickwit endpoint not configured"))?;
+
+    let mut conn = pool.get().context("failed to get database connection")?;
+    let tenant: Tenant = tenants::table
+        .filter(tenants::slug.eq(slug))
+        .first(&mut conn)
+        .optional()
+        .context("failed to query tenants")?
+        .ok_or_else(|| anyhow!("tenant '{}' not found", slug))?;
+
+    let client = Client::new();
+    let index_id = format!("documents-{}", tenant.id);
+    let base_endpoint = endpoint.trim_end_matches('/');
+
+    match method {
+        Method::POST => {
+            let payload = render_index_template(&index_id);
+            let response = client
+                .post(format!("{}/api/v1/indexes", base_endpoint))
+                .header("content-type", "application/json")
+                .body(payload)
+                .send()
+                .await
+                .context("failed to send create index request")?;
+
+            match response.status() {
+                status if status.is_success() => {
+                    diesel::update(tenants::table.filter(tenants::id.eq(tenant.id)))
+                        .set(tenants::quickwit_index.eq(Some(index_id.clone())))
+                        .execute(&mut conn)
+                        .context("failed to update tenant quickwit_index")?;
+
+                    println!(
+                        "Tenant '{}' quickwit index set to '{}'.",
+                        tenant.slug, index_id
+                    );
+                }
+                StatusCode::CONFLICT => {
+                    let lookup = client
+                        .get(format!("{}/api/v1/indexes/{}", base_endpoint, index_id))
+                        .send()
+                        .await
+                        .context("failed to verify existing quickwit index")?;
+
+                    let lookup_status = lookup.status();
+                    if !lookup_status.is_success() {
+                        let body = lookup.text().await.unwrap_or_default();
+                        bail!(
+                            "quickwit reported conflict but index lookup failed with status {}: {}",
+                            lookup_status,
+                            body
+                        );
+                    }
+
+                    diesel::update(tenants::table.filter(tenants::id.eq(tenant.id)))
+                        .set(tenants::quickwit_index.eq(Some(index_id.clone())))
+                        .execute(&mut conn)
+                        .context("failed to update tenant quickwit_index")?;
+
+                    println!(
+                        "Tenant '{}' quickwit index set to '{}'.",
+                        tenant.slug, index_id
+                    );
+                }
+                status => {
+                    let body = response.text().await.unwrap_or_default();
+                    bail!(
+                        "quickwit create index failed with status {}: {}",
+                        status,
+                        body
+                    );
+                }
+            }
+        }
+        Method::DELETE => {
+            let response = client
+                .delete(format!("{}/api/v1/indexes/{}", base_endpoint, index_id))
+                .send()
+                .await
+                .context("failed to send delete index request")?;
+
+            match response.status() {
+                status if status.is_success() || status == StatusCode::NOT_FOUND => {
+                    diesel::update(tenants::table.filter(tenants::id.eq(tenant.id)))
+                        .set(tenants::quickwit_index.eq::<Option<String>>(None))
+                        .execute(&mut conn)
+                        .context("failed to clear tenant quickwit_index")?;
+
+                    println!("Tenant '{}' quickwit index cleared.", tenant.slug);
+                }
+                status => {
+                    let body = response.text().await.unwrap_or_default();
+                    bail!(
+                        "quickwit delete index failed with status {}: {}",
+                        status,
+                        body
+                    );
+                }
+            }
+        }
+        _ => unreachable!(),
+    }
+
+    Ok(())
+}
+
+fn render_index_template(index_id: &str) -> String {
+    let mut template = QUICKWIT_INDEX_TEMPLATE.clone();
+    if let Some(obj) = template.as_object_mut() {
+        obj.insert(
+            "index_id".to_string(),
+            serde_json::Value::String(index_id.to_string()),
+        );
+    }
+    template.to_string()
+}

backend/src/bin/maintenance.rs

@@ -1,75 +0,0 @@
-use std::env;
-
-use anyhow::{Context, Result};
-use diesel::prelude::*;
-
-use backend::{
-    config::AppConfig,
-    db,
-    models::DocumentAsset,
-    s3,
-    schema::document_assets,
-    storage::{ObjectStorage, S3Storage},
-};
-
-#[tokio::main]
-async fn main() -> Result<()> {
-    let mut args = env::args().skip(1);
-    match args.next().as_deref() {
-        Some("delete-assets") => delete_all_assets().await?,
-        Some(cmd) => {
-            eprintln!("Unknown command: {cmd}\nUsage: maintenance delete-assets");
-            std::process::exit(1);
-        }
-        None => {
-            eprintln!("Usage: maintenance delete-assets");
-            std::process::exit(1);
-        }
-    }
-
-    Ok(())
-}
-
-async fn delete_all_assets() -> Result<()> {
-    let config = AppConfig::from_env()?;
-    tracing::info!(
-        component = "maintenance",
-        database_url = %config.redacted_database_url(),
-        pool_size = config.database_max_pool_size,
-        s3_bucket = %config.s3_bucket,
-        "loaded backend configuration"
-    );
-    let pool = db::init_pool_with_size(&config.database_url, config.database_max_pool_size)?;
-
-    let s3_client = s3::build_client(&config).await?;
-    let storage = S3Storage::new(s3_client, config.s3_bucket.clone());
-
-    let mut conn = pool.get().context("failed to get database connection")?;
-
-    let assets: Vec<DocumentAsset> = document_assets::table
-        .load(&mut conn)
-        .context("failed to load document assets")?;
-
-    if assets.is_empty() {
-        println!("No assets found.");
-        return Ok(());
-    }
-
-    println!("Deleting {} assets…", assets.len());
-
-    for asset in &assets {
-        if let Err(err) = storage.delete_object(&asset.s3_key).await {
-            eprintln!(
-                "Failed to delete object {} from storage: {err}",
-                asset.s3_key
-            );
-        }
-    }
-
-    diesel::delete(document_assets::table)
-        .execute(&mut conn)
-        .context("failed to remove asset records")?;
-
-    println!("Asset records deleted.");
-    Ok(())
-}

backend/src/bin/openapi_dump.rs

@@ -0,0 +1,8 @@
+use backend::openapi::ApiDoc;
+use utoipa::OpenApi;
+
+fn main() {
+    let spec = ApiDoc::openapi();
+    let json = serde_json::to_string_pretty(&spec).expect("serialize openapi");
+    println!("{}", json);
+}

backend/src/bin/webdav.rs

@@ -1,47 +1,24 @@
 use std::net::SocketAddr;
-use std::sync::Arc;
 
 use tokio::net::TcpListener;
 use tower::make::Shared;
-use tracing_subscriber::EnvFilter;
 
-use backend::auth::jwt::JwtService;
+use backend::{routes::webdav, utils::bootstrap::init_component};
-use backend::config::AppConfig;
-use backend::db;
-use backend::routes::webdav;
-use backend::s3::build_client;
-use backend::state::AppState;
-use backend::storage::S3Storage;
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
-    dotenv::dotenv().ok();
+    let state = init_component("webdav", None).await?;
-    init_tracing();
+    let webdav_host = state.config.webdav_host.clone();
-
+    let webdav_port = state.config.webdav_port;
-    let config = AppConfig::from_env()?;
     tracing::info!(
         component = "webdav",
-        database_url = %config.redacted_database_url(),
+        webdav_host = %webdav_host,
-        pool_size = config.database_max_pool_size,
+        webdav_port,
-        server_host = %config.server_host,
+        "starting webdav server"
-        server_port = config.server_port,
-        webdav_host = %config.webdav_host,
-        webdav_port = config.webdav_port,
-        quickwit_enabled = config.quickwit_endpoint.is_some(),
-        s3_bucket = %config.s3_bucket,
-        "loaded backend configuration"
     );
-    let pool = db::init_pool_with_size(&config.database_url, config.database_max_pool_size)?;
-    let s3_client = build_client(&config).await?;
-    let storage = Arc::new(S3Storage::new(s3_client, config.s3_bucket.clone()));
-    let jwt = JwtService::from_config(&config)?;
 
-    let state = AppState::new(pool, config, storage, jwt);
+    let listen_addr: SocketAddr = format!("{}:{}", webdav_host, webdav_port).parse()?;
-    let listen_addr: SocketAddr = {
+    let router = webdav::create_router().with_state(state.as_ref().clone());
-        let config = state.config.clone();
-        format!("{}:{}", config.webdav_host, config.webdav_port).parse()?
-    };
-    let router = webdav::create_router().with_state(state);
 
     let listener = TcpListener::bind(listen_addr).await?;
     tracing::info!("listening for WebDAV on {}", listen_addr);
@@ -49,12 +26,3 @@ async fn main() -> anyhow::Result<()> {
     axum::serve(listener, Shared::new(router)).await?;
     Ok(())
 }
-
-fn init_tracing() {
-    let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info"));
-    tracing_subscriber::fmt()
-        .with_env_filter(filter)
-        .with_target(false)
-        .compact()
-        .init();
-}

backend/src/bin/worker.rs

@@ -1,33 +1,13 @@
-use std::{sync::Arc, time::Duration};
+use std::time::Duration;
 
 use tokio::signal;
-use tracing_subscriber::EnvFilter;
 
-use backend::{
+use backend::{default_handlers, utils::bootstrap::init_component, Worker};
-    auth::jwt::JwtService, config::AppConfig, db, default_handlers, s3::build_client,
-    state::AppState, storage::S3Storage, Worker,
-};
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
-    dotenv::dotenv().ok();
+    let state = init_component("worker", Some(1)).await?;
-    init_tracing();
+    tracing::info!(component = "worker", "starting worker process");
-
-    let config = AppConfig::from_env()?;
-    tracing::info!(
-        component = "worker",
-        database_url = %config.redacted_database_url(),
-        pool_size = 1,
-        quickwit_enabled = config.quickwit_endpoint.is_some(),
-        s3_bucket = %config.s3_bucket,
-        "loaded backend configuration"
-    );
-    let pool = db::init_pool_with_size(&config.database_url, 1)?;
-    let s3_client = build_client(&config).await?;
-    let storage = Arc::new(S3Storage::new(s3_client, config.s3_bucket.clone()));
-    let jwt = JwtService::from_config(&config)?;
-
-    let state = Arc::new(AppState::new(pool, config, storage, jwt));
     let worker = Worker::new(state, default_handlers(), Duration::from_secs(2));
 
     tokio::select! {
@@ -39,12 +19,3 @@ async fn main() -> anyhow::Result<()> {
 
     Ok(())
 }
-
-fn init_tracing() {
-    let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info"));
-    tracing_subscriber::fmt()
-        .with_env_filter(filter)
-        .with_target(false)
-        .compact()
-        .init();
-}

backend/src/config.rs

@@ -1,110 +1,82 @@
-use std::env;
-
 use anyhow::{Context, Result};
 use url::Url;
 
+use serde::Deserialize;
+use serde_aux::field_attributes::deserialize_bool_from_anything;
+
 use crate::db::DEFAULT_MAX_POOL_SIZE;
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Deserialize)]
 pub struct AppConfig {
     pub database_url: String,
+    #[serde(default = "default_database_max_pool_size")]
     pub database_max_pool_size: u32,
+    #[serde(default = "default_server_host")]
     pub server_host: String,
+    #[serde(default = "default_server_port")]
     pub server_port: u16,
+    #[serde(default = "default_webdav_host")]
     pub webdav_host: String,
+    #[serde(default = "default_webdav_port")]
     pub webdav_port: u16,
     pub jwt_secret: String,
+    #[serde(default = "default_jwt_issuer")]
     pub jwt_issuer: String,
+    #[serde(default = "default_jwt_audience")]
     pub jwt_audience: String,
+    #[serde(default = "default_jwt_expiry_minutes")]
     pub jwt_expiry_minutes: i64,
+    #[serde(default = "default_download_token_audience")]
     pub download_token_audience: String,
+    #[serde(default = "default_download_token_expiry_minutes")]
     pub download_token_expiry_minutes: i64,
+    #[serde(default = "default_refresh_token_expiry_days")]
     pub refresh_token_expiry_days: i64,
+    #[serde(
+        default = "default_refresh_cookie_secure",
+        deserialize_with = "deserialize_bool_from_anything"
+    )]
     pub refresh_cookie_secure: bool,
+    #[serde(default)]
     pub refresh_cookie_domain: Option<String>,
+    #[serde(default)]
     pub cors_allowed_origin: Option<String>,
+    #[serde(default)]
     pub aws_endpoint_url: Option<String>,
+    #[serde(default)]
     pub aws_access_key_id: Option<String>,
+    #[serde(default)]
     pub aws_secret_access_key: Option<String>,
+    #[serde(default = "default_aws_region")]
     pub aws_region: String,
     pub s3_bucket: String,
+    #[serde(default)]
     pub quickwit_endpoint: Option<String>,
+    #[serde(default)]
     pub quickwit_index: Option<String>,
+    #[serde(default = "default_tenant_slug")]
+    pub default_tenant_slug: String,
 }
 
 impl AppConfig {
-    pub fn from_env() -> Result<Self> {
+    pub fn load_and_log(component: &str) -> Result<Self> {
-        let database_url = env::var("DATABASE_URL").context("DATABASE_URL must be set")?;
+        dotenv::dotenv().ok();
-        let database_max_pool_size = env::var("DATABASE_MAX_POOL_SIZE")
+        let config = Self::from_env()?;
-            .ok()
+        tracing::info!(
-            .and_then(|value| value.parse().ok())
+            component,
-            .unwrap_or(DEFAULT_MAX_POOL_SIZE);
+            database_url = %config.redacted_database_url(),
-        let server_host = env::var("SERVER_HOST").unwrap_or_else(|_| "127.0.0.1".to_string());
+            pool_size = config.database_max_pool_size,
-        let server_port = env::var("SERVER_PORT")
+            quickwit_enabled = config.quickwit_endpoint.is_some(),
-            .unwrap_or_else(|_| "3000".to_string())
+            s3_bucket = %config.s3_bucket,
-            .parse()
+            "loaded backend configuration"
-            .context("SERVER_PORT must be a valid u16")?;
+        );
-        let webdav_host = env::var("WEBDAV_HOST").unwrap_or_else(|_| server_host.clone());
+        Ok(config)
-        let webdav_port = env::var("WEBDAV_PORT")
+    }
-            .unwrap_or_else(|_| "3001".to_string())
-            .parse()
-            .context("WEBDAV_PORT must be a valid u16")?;
-        let jwt_secret = env::var("JWT_SECRET").context("JWT_SECRET must be set")?;
-        let jwt_issuer = env::var("JWT_ISSUER").unwrap_or_else(|_| "papercrate".to_string());
-        let jwt_audience =
-            env::var("JWT_AUDIENCE").unwrap_or_else(|_| "papercrate-clients".to_string());
-        let jwt_expiry_minutes = env::var("JWT_EXPIRY_MINUTES")
-            .unwrap_or_else(|_| "60".to_string())
-            .parse()
-            .context("JWT_EXPIRY_MINUTES must be an integer")?;
-        let download_token_audience = env::var("DOWNLOAD_TOKEN_AUDIENCE")
-            .unwrap_or_else(|_| "papercrate-download".to_string());
-        let download_token_expiry_minutes = env::var("DOWNLOAD_TOKEN_EXPIRY_MINUTES")
-            .unwrap_or_else(|_| "60".to_string())
-            .parse()
-            .context("DOWNLOAD_TOKEN_EXPIRY_MINUTES must be an integer")?;
-        let refresh_token_expiry_days = env::var("REFRESH_TOKEN_EXPIRY_DAYS")
-            .unwrap_or_else(|_| "30".to_string())
-            .parse()
-            .context("REFRESH_TOKEN_EXPIRY_DAYS must be an integer")?;
-        let refresh_cookie_secure = env::var("REFRESH_COOKIE_SECURE")
-            .map(|v| v == "1" || v.eq_ignore_ascii_case("true"))
-            .unwrap_or(false);
-        let refresh_cookie_domain = env::var("REFRESH_COOKIE_DOMAIN").ok();
-        let cors_allowed_origin = env::var("CORS_ALLOWED_ORIGIN").ok();
-        let aws_endpoint_url = env::var("AWS_ENDPOINT_URL").ok();
-        let aws_access_key_id = env::var("AWS_ACCESS_KEY_ID").ok();
-        let aws_secret_access_key = env::var("AWS_SECRET_ACCESS_KEY").ok();
-        let aws_region = env::var("AWS_REGION").unwrap_or_else(|_| "us-east-1".to_string());
-        let s3_bucket = env::var("S3_BUCKET").context("S3_BUCKET must be set")?;
-        let quickwit_endpoint = env::var("QUICKWIT_ENDPOINT").ok();
-        let quickwit_index = env::var("QUICKWIT_INDEX").ok();
 
-        Ok(Self {
+    pub fn from_env() -> Result<Self> {
-            database_url,
+        let config: AppConfig = envy::from_env()
-            database_max_pool_size,
+            .context("failed to parse application configuration from environment")?;
-            server_host,
+        Ok(config.normalize())
-            server_port,
-            webdav_host,
-            webdav_port,
-            jwt_secret,
-            jwt_issuer,
-            jwt_audience,
-            jwt_expiry_minutes,
-            download_token_audience,
-            download_token_expiry_minutes,
-            refresh_token_expiry_days,
-            refresh_cookie_secure,
-            refresh_cookie_domain,
-            cors_allowed_origin,
-            aws_endpoint_url,
-            aws_access_key_id,
-            aws_secret_access_key,
-            aws_region,
-            s3_bucket,
-            quickwit_endpoint,
-            quickwit_index,
-        })
     }
 
     pub fn redacted_database_url(&self) -> String {
@@ -112,11 +84,80 @@ impl AppConfig {
     }
 }
 
+impl AppConfig {
+    fn normalize(mut self) -> Self {
+        if self.webdav_host.is_empty() {
+            self.webdav_host = self.server_host.clone();
+        }
+        self
+    }
+}
+
+fn default_database_max_pool_size() -> u32 {
+    DEFAULT_MAX_POOL_SIZE
+}
+
+fn default_server_host() -> String {
+    "127.0.0.1".to_string()
+}
+
+fn default_server_port() -> u16 {
+    3000
+}
+
+fn default_webdav_host() -> String {
+    String::new()
+}
+
+fn default_webdav_port() -> u16 {
+    3001
+}
+
+fn default_jwt_issuer() -> String {
+    "papercrate".to_string()
+}
+
+fn default_jwt_audience() -> String {
+    "papercrate-clients".to_string()
+}
+
+fn default_jwt_expiry_minutes() -> i64 {
+    60
+}
+
+fn default_download_token_audience() -> String {
+    "papercrate-download".to_string()
+}
+
+fn default_download_token_expiry_minutes() -> i64 {
+    60
+}
+
+fn default_refresh_token_expiry_days() -> i64 {
+    30
+}
+
+fn default_refresh_cookie_secure() -> bool {
+    false
+}
+
+fn default_aws_region() -> String {
+    "us-east-1".to_string()
+}
+
+fn default_tenant_slug() -> String {
+    "admin".to_string()
+}
+
 fn redact_database_url(raw: &str) -> String {
     match Url::parse(raw) {
         Ok(mut parsed) => {
+            if parsed.password().is_some() {
                 let _ = parsed.set_password(Some("*****"));
                 parsed.to_string()
+            } else {
+                raw.to_string()
+            }
         }
         Err(_) => "***".to_string(),
     }

backend/src/documents/asset.rs

@@ -0,0 +1,276 @@
+use std::collections::HashMap;
+use std::path::Path as FsPath;
+
+use diesel::prelude::*;
+use serde::Serialize;
+use serde_json::Value;
+use utoipa::ToSchema;
+use uuid::Uuid;
+
+use crate::error::{AppError, AppResult};
+use crate::models::{Document, DocumentAsset, DocumentAssetObject, DocumentVersion};
+use crate::schema::{document_asset_objects, document_assets, document_versions};
+use crate::state::AppState;
+use crate::utils::time::to_iso;
+
+#[derive(Serialize, Clone, ToSchema)]
+pub struct DocumentAssetResponse {
+    pub id: Uuid,
+    pub asset_type: String,
+    pub mime_type: String,
+    pub metadata: Value,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub cardinality: Option<i32>,
+}
+
+#[derive(Serialize, Clone, ToSchema)]
+pub struct DocumentAssetObjectResponse {
+    pub id: Uuid,
+    pub ordinal: i32,
+    pub metadata: Value,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub url: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub expires_at: Option<i64>,
+}
+
+#[derive(Serialize, ToSchema)]
+pub struct DocumentAssetDetailResponse {
+    pub id: Uuid,
+    pub asset_type: String,
+    pub mime_type: String,
+    pub metadata: Value,
+    pub created_at: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub cardinality: Option<i32>,
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    pub objects: Vec<DocumentAssetObjectResponse>,
+}
+
+#[derive(Serialize, Clone, ToSchema)]
+pub struct DocumentVersionResponse {
+    pub id: Uuid,
+    pub version_number: i32,
+    pub size_bytes: i64,
+    pub checksum: String,
+    pub created_at: String,
+    pub metadata: Value,
+}
+
+#[derive(Serialize, Clone, ToSchema)]
+pub struct DocumentVersionDetailResponse {
+    #[serde(flatten)]
+    pub version: DocumentVersionResponse,
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    pub assets: Vec<DocumentAssetResponse>,
+    pub download_path: String,
+}
+
+pub fn build_download_path(
+    state: &AppState,
+    document: &Document,
+    user_id: Uuid,
+) -> AppResult<String> {
+    state
+        .jwt
+        .generate_download_token(document.id, user_id, document.tenant_id)
+        .map(|token| format!("/download/{token}"))
+        .map_err(|err| AppError::internal(format!("failed to generate download token: {err}")))
+}
+
+pub fn to_version_response(version: DocumentVersion) -> DocumentVersionResponse {
+    DocumentVersionResponse {
+        id: version.id,
+        version_number: version.version_number,
+        size_bytes: version.size_bytes,
+        checksum: version.checksum,
+        created_at: to_iso(version.created_at),
+        metadata: version.metadata,
+    }
+}
+
+pub fn to_asset_summary(asset: DocumentAsset) -> DocumentAssetResponse {
+    DocumentAssetResponse {
+        id: asset.id,
+        asset_type: asset.asset_type,
+        mime_type: asset.mime_type,
+        metadata: asset.metadata,
+        cardinality: asset.cardinality,
+    }
+}
+
+pub fn to_asset_detail_response(
+    asset: DocumentAsset,
+    objects: Vec<DocumentAssetObjectResponse>,
+) -> DocumentAssetDetailResponse {
+    DocumentAssetDetailResponse {
+        id: asset.id,
+        asset_type: asset.asset_type,
+        mime_type: asset.mime_type,
+        metadata: asset.metadata,
+        created_at: to_iso(asset.created_at),
+        cardinality: asset.cardinality,
+        objects,
+    }
+}
+
+pub fn to_asset_object_response(
+    object: DocumentAssetObject,
+    url: Option<String>,
+    expires_at: Option<i64>,
+) -> DocumentAssetObjectResponse {
+    DocumentAssetObjectResponse {
+        id: object.id,
+        ordinal: object.ordinal,
+        metadata: object.metadata,
+        url,
+        expires_at,
+    }
+}
+
+pub fn delete_asset(state: &AppState, tenant_id: Uuid, asset_id: Uuid) -> AppResult<()> {
+    let mut conn = state.db_for_tenant(tenant_id)?;
+
+    diesel::delete(
+        document_assets::table
+            .filter(document_assets::id.eq(asset_id))
+            .filter(document_assets::tenant_id.eq(tenant_id)),
+    )
+    .execute(&mut conn)?;
+
+    Ok(())
+}
+
+pub async fn load_asset_responses(
+    state: &AppState,
+    tenant_id: Uuid,
+    version_id: Uuid,
+) -> AppResult<Vec<DocumentAssetResponse>> {
+    let mut conn = state.db_for_tenant(tenant_id)?;
+    let assets: Vec<(DocumentAsset, Option<DocumentAssetObject>)> = document_assets::table
+        .left_outer_join(
+            document_asset_objects::table.on(document_asset_objects::asset_id
+                .eq(document_assets::id)
+                .and(document_asset_objects::ordinal.eq(1))),
+        )
+        .filter(document_assets::document_version_id.eq(version_id))
+        .filter(document_assets::tenant_id.eq(tenant_id))
+        .order(document_assets::created_at.asc())
+        .select((
+            document_assets::all_columns,
+            document_asset_objects::all_columns.nullable(),
+        ))
+        .load(&mut conn)?;
+    drop(conn);
+
+    Ok(assets
+        .into_iter()
+        .map(|(asset, _)| to_asset_summary(asset))
+        .collect())
+}
+
+pub fn load_primary_assets(
+    state: &AppState,
+    tenant_id: Uuid,
+    documents: &[Document],
+) -> AppResult<HashMap<Uuid, (DocumentVersionResponse, Vec<DocumentAssetResponse>)>> {
+    if documents.is_empty() {
+        return Ok(HashMap::new());
+    }
+
+    let mut doc_to_version: HashMap<Uuid, Uuid> = HashMap::with_capacity(documents.len());
+    let mut version_ids: Vec<Uuid> = Vec::with_capacity(documents.len());
+    for doc in documents {
+        doc_to_version.insert(doc.id, doc.current_version_id);
+        version_ids.push(doc.current_version_id);
+    }
+
+    version_ids.sort();
+    version_ids.dedup();
+
+    let mut conn = state.db_for_tenant(tenant_id)?;
+    let versions: Vec<DocumentVersion> = document_versions::table
+        .filter(document_versions::id.eq_any(&version_ids))
+        .load(&mut conn)?;
+
+    let mut version_map: HashMap<Uuid, DocumentVersion> = HashMap::new();
+    for version in versions {
+        version_map.insert(version.id, version);
+    }
+
+    let assets: Vec<(DocumentAsset, Option<DocumentAssetObject>)> = document_assets::table
+        .left_outer_join(
+            document_asset_objects::table.on(document_asset_objects::asset_id
+                .eq(document_assets::id)
+                .and(document_asset_objects::ordinal.eq(1))),
+        )
+        .filter(document_assets::document_version_id.eq_any(&version_ids))
+        .order((
+            document_assets::document_version_id.asc(),
+            document_assets::created_at.asc(),
+        ))
+        .select((
+            document_assets::all_columns,
+            document_asset_objects::all_columns.nullable(),
+        ))
+        .load(&mut conn)?;
+
+    drop(conn);
+
+    let mut assets_by_version: HashMap<Uuid, Vec<DocumentAssetResponse>> = HashMap::new();
+    for (asset, _object) in assets {
+        let version_id = asset.document_version_id;
+        let response = to_asset_summary(asset);
+        assets_by_version
+            .entry(version_id)
+            .or_default()
+            .push(response);
+    }
+
+    let mut result: HashMap<Uuid, (DocumentVersionResponse, Vec<DocumentAssetResponse>)> =
+        HashMap::with_capacity(doc_to_version.len());
+    for (doc_id, version_id) in doc_to_version {
+        if let Some(version) = version_map.remove(&version_id) {
+            let assets = assets_by_version.remove(&version_id).unwrap_or_default();
+            result.insert(doc_id, (to_version_response(version), assets));
+        }
+    }
+
+    Ok(result)
+}
+
+pub fn derive_document_title(original: &str) -> String {
+    let trimmed = original.trim();
+    if trimmed.is_empty() {
+        return "Document".to_string();
+    }
+
+    let stem = FsPath::new(trimmed)
+        .file_stem()
+        .and_then(|s| s.to_str())
+        .map(|s| s.trim())
+        .filter(|s| !s.is_empty())
+        .map(|s| s.to_string());
+
+    stem.unwrap_or_else(|| trimmed.to_string())
+}
+
+pub fn filename_with_retained_extension(title: &str, current_filename: &str) -> String {
+    let extension = FsPath::new(current_filename)
+        .extension()
+        .and_then(|ext| ext.to_str());
+
+    if let Some(ext) = extension {
+        if title
+            .rsplit_once('.')
+            .map(|(_, existing_ext)| existing_ext.eq_ignore_ascii_case(ext))
+            .unwrap_or(false)
+        {
+            title.to_string()
+        } else {
+            format!("{title}.{ext}")
+        }
+    } else {
+        title.to_string()
+    }
+}

backend/src/documents/correspondents.rs

@@ -0,0 +1,120 @@
+use std::collections::HashMap;
+
+use chrono::Utc;
+use diesel::prelude::*;
+use serde::Serialize;
+use serde_json::Value;
+use utoipa::ToSchema;
+use uuid::Uuid;
+
+use crate::error::{AppError, AppResult};
+use crate::models::{Correspondent, DocumentCorrespondent, NewDocumentCorrespondent};
+use crate::schema::{correspondents, document_correspondents, documents};
+use crate::utils::time::to_iso;
+
+#[derive(Serialize, Clone, ToSchema)]
+pub struct DocumentCorrespondentResponse {
+    pub id: Uuid,
+    pub name: String,
+    pub metadata: Value,
+    pub assigned_at: String,
+}
+
+pub fn normalize_correspondent_ids(ids: &[Uuid]) -> AppResult<Vec<Uuid>> {
+    let mut unique: Vec<Uuid> = ids.iter().copied().collect();
+    unique.sort_unstable();
+    unique.dedup();
+
+    if unique.is_empty() {
+        return Err(AppError::bad_request(
+            "assignments must contain at least one correspondent",
+        ));
+    }
+
+    Ok(unique)
+}
+
+pub fn insert_document_correspondents(
+    conn: &mut PgConnection,
+    tenant_id: Uuid,
+    document_id: Uuid,
+    user_id: Uuid,
+    correspondent_ids: &[Uuid],
+) -> AppResult<usize> {
+    let ids = normalize_correspondent_ids(correspondent_ids)?;
+
+    let existing: Vec<Uuid> = correspondents::table
+        .filter(correspondents::id.eq_any(&ids))
+        .filter(correspondents::tenant_id.eq(tenant_id))
+        .select(correspondents::id)
+        .load(conn)?;
+
+    if existing.len() != ids.len() {
+        return Err(AppError::bad_request(
+            "one or more correspondents do not exist",
+        ));
+    }
+
+    let new_rows: Vec<NewDocumentCorrespondent> = ids
+        .into_iter()
+        .map(|correspondent_id| NewDocumentCorrespondent {
+            document_id,
+            correspondent_id,
+            assigned_by: Some(user_id),
+            tenant_id,
+        })
+        .collect();
+
+    if new_rows.is_empty() {
+        return Ok(0);
+    }
+
+    let inserted = diesel::insert_into(document_correspondents::table)
+        .values(&new_rows)
+        .on_conflict_do_nothing()
+        .execute(conn)?;
+
+    if inserted > 0 {
+        diesel::update(
+            documents::table
+                .find(document_id)
+                .filter(documents::tenant_id.eq(tenant_id)),
+        )
+        .set(documents::updated_at.eq(Utc::now().naive_utc()))
+        .execute(conn)?;
+    }
+
+    Ok(inserted)
+}
+
+pub fn load_correspondents_for_documents(
+    conn: &mut PgConnection,
+    document_ids: &[Uuid],
+) -> AppResult<HashMap<Uuid, Vec<DocumentCorrespondentResponse>>> {
+    if document_ids.is_empty() {
+        return Ok(HashMap::new());
+    }
+
+    let rows: Vec<(DocumentCorrespondent, Correspondent)> = document_correspondents::table
+        .inner_join(correspondents::table)
+        .filter(document_correspondents::document_id.eq_any(document_ids))
+        .order((
+            document_correspondents::document_id.asc(),
+            document_correspondents::assigned_at.asc(),
+        ))
+        .load(conn)?;
+
+    let mut map: HashMap<Uuid, Vec<DocumentCorrespondentResponse>> = HashMap::new();
+    for (assignment, correspondent) in rows {
+        map.entry(assignment.document_id)
+            .or_default()
+            .push(DocumentCorrespondentResponse {
+                id: correspondent.id,
+                name: correspondent.name,
+                metadata: correspondent.metadata,
+                assigned_at: to_iso(assignment.assigned_at),
+            });
+    }
+
+    Ok(map)
+}

backend/src/documents/folders.rs

@@ -0,0 +1,21 @@
+use diesel::dsl::exists;
+use diesel::prelude::*;
+use uuid::Uuid;
+
+use crate::error::AppResult;
+use crate::schema::folders;
+use crate::utils::validation::ensure_exists;
+
+pub fn ensure_folder_exists_on_conn(
+    conn: &mut PgConnection,
+    tenant_id: Uuid,
+    folder_id: Uuid,
+) -> AppResult<()> {
+    let exists: bool = diesel::select(exists(
+        folders::table
+            .filter(folders::id.eq(folder_id))
+            .filter(folders::tenant_id.eq(tenant_id)),
+    ))
+    .get_result(conn)?;
+    ensure_exists(exists, "folder")
+}

backend/src/documents/metadata.rs

@@ -0,0 +1,52 @@
+use serde_json::{map::Entry, Map, Value};
+
+use crate::error::{AppError, AppResult};
+
+pub fn merge_document_metadata(existing: Value, updates: Value) -> AppResult<Value> {
+    let mut base = match existing {
+        Value::Object(map) => map,
+        Value::Null => Map::new(),
+        _ => {
+            return Err(AppError::bad_request(
+                "existing metadata is not an object; set replace=true to overwrite",
+            ));
+        }
+    };
+
+    let incoming = match updates {
+        Value::Object(map) => map,
+        _ => {
+            return Err(AppError::bad_request(
+                "metadata value must be a JSON object when replace is false",
+            ));
+        }
+    };
+
+    merge_metadata_maps(&mut base, incoming);
+    Ok(Value::Object(base))
+}
+
+fn merge_metadata_maps(target: &mut Map<String, Value>, updates: Map<String, Value>) {
+    for (key, value) in updates {
+        match target.entry(key) {
+            Entry::Occupied(mut entry) => {
+                let existing = entry.get_mut();
+                match value {
+                    Value::Object(update_map) => {
+                        if let Value::Object(existing_map) = existing {
+                            merge_metadata_maps(existing_map, update_map);
+                        } else {
+                            *existing = Value::Object(update_map);
+                        }
+                    }
+                    other => {
+                        *existing = other;
+                    }
+                }
+            }
+            Entry::Vacant(entry) => {
+                entry.insert(value);
+            }
+        }
+    }
+}

backend/src/documents/mod.rs

@@ -0,0 +1,6 @@
+pub mod asset;
+pub mod correspondents;
+pub mod folders;
+pub mod metadata;
+pub mod search;
+pub mod tags;

backend/src/documents/search.rs

@@ -0,0 +1,166 @@
+use std::collections::HashSet;
+
+use anyhow::{anyhow, Result};
+use reqwest::Client;
+use serde::Deserialize;
+use serde_json::{json, Value};
+use tracing::{debug, error};
+use uuid::Uuid;
+
+pub const QUICKWIT_MAX_HITS: usize = 200;
+
+pub fn build_quickwit_query(input: &str) -> Option<String> {
+    let tokens: Vec<String> = input
+        .split_whitespace()
+        .filter(|token| !token.is_empty())
+        .map(|token| {
+            let normalized = token.to_lowercase();
+            escape_quickwit_token(&normalized)
+        })
+        .collect();
+
+    if tokens.is_empty() {
+        return None;
+    }
+
+    let parts: Vec<String> = tokens
+        .into_iter()
+        .map(|token| format!("(title:{token} OR text:{token})"))
+        .collect();
+
+    Some(parts.join(" AND "))
+}
+
+pub fn escape_quickwit_token(token: &str) -> String {
+    let mut escaped = String::with_capacity(token.len());
+    for ch in token.chars() {
+        match ch {
+            '+' | '-' | '&' | '|' | '!' | '(' | ')' | '{' | '}' | '[' | ']' | '^' | '"' | '~'
+            | '*' | '?' | ':' | '\\' | '/' => {
+                escaped.push('\\');
+                escaped.push(ch);
+            }
+            _ => escaped.push(ch),
+        }
+    }
+    escaped
+}
+
+pub async fn quickwit_search(
+    endpoint: &str,
+    index: &str,
+    tenant_id: Uuid,
+    query: &str,
+) -> Result<Vec<Uuid>> {
+    let tenant_clause = format!("tenant_id:{}", tenant_id);
+    let quickwit_query = match build_quickwit_query(query) {
+        Some(q) => {
+            debug!(%query, quickwit_query = %q, "built quickwit search query");
+            format!("{} AND ({})", tenant_clause, q)
+        }
+        None => {
+            debug!(%query, "quickwit search skipped because query produced no tokens");
+            return Ok(vec![]);
+        }
+    };
+
+    let client = Client::new();
+    let url = format!("{}/api/v1/{}/search", endpoint.trim_end_matches('/'), index);
+
+    let payload = json!({
+        "query": quickwit_query,
+        "max_hits": QUICKWIT_MAX_HITS,
+    });
+
+    debug!(%url, payload = %payload, "sending quickwit search request");
+    let response = client.post(url).json(&payload).send().await?;
+    if !response.status().is_success() {
+        let status = response.status();
+        let body = response.text().await.unwrap_or_default();
+        error!(%status, body = %body, "quickwit search request failed");
+        return Err(anyhow!(
+            "quickwit search failed with status {status}: {body}"
+        ));
+    }
+
+    let data: QuickwitSearchResponse = response.json().await?;
+    debug!("quickwit search response parsed successfully");
+    let QuickwitSearchResponse { hits } = data;
+
+    let total_hits = hits.len();
+    let mut seen = HashSet::new();
+    let mut doc_ids = Vec::with_capacity(total_hits);
+
+    for hit in hits {
+        if let Some(doc_id) = extract_document_id(&hit) {
+            if seen.insert(doc_id) {
+                doc_ids.push(doc_id);
+            }
+        }
+    }
+
+    debug!(
+        total_hits = total_hits,
+        unique_ids = doc_ids.len(),
+        "quickwit search completed"
+    );
+    Ok(doc_ids)
+}
+
+pub fn extract_document_id(hit: &Value) -> Option<Uuid> {
+    for key in ["_source", "source", "fields", "stored_fields"] {
+        if let Some(value) = hit.get(key) {
+            if let Some(uuid) = extract_uuid_from_value(value) {
+                return Some(uuid);
+            }
+        }
+    }
+
+    if let Some(value) = hit.get("document_id") {
+        if let Some(uuid) = extract_uuid_from_value(value) {
+            return Some(uuid);
+        }
+    }
+
+    None
+}
+
+pub fn extract_uuid_from_value(value: &Value) -> Option<Uuid> {
+    if let Some(obj) = value.as_object() {
+        if let Some(inner) = obj.get("document_id") {
+            return parse_uuid_value(inner);
+        }
+    }
+
+    if let Some(arr) = value.as_array() {
+        for item in arr {
+            if let Some(uuid) = extract_uuid_from_value(item) {
+                return Some(uuid);
+            }
+        }
+    }
+
+    parse_uuid_value(value)
+}
+
+pub fn parse_uuid_value(value: &Value) -> Option<Uuid> {
+    if let Some(s) = value.as_str() {
+        return Uuid::parse_str(s).ok();
+    }
+
+    if let Some(arr) = value.as_array() {
+        for item in arr {
+            if let Some(uuid) = parse_uuid_value(item) {
+                return Some(uuid);
+            }
+        }
+    }
+
+    None
+}
+
+#[derive(Deserialize)]
+struct QuickwitSearchResponse {
+    #[serde(default)]
+    hits: Vec<Value>,
+}

backend/src/documents/tags.rs

@@ -0,0 +1,80 @@
+use std::collections::HashMap;
+
+use diesel::prelude::*;
+use uuid::Uuid;
+
+use crate::error::{AppError, AppResult};
+use crate::models::{Document, NewDocumentTag, Tag};
+use crate::schema::{document_tags, tags};
+
+pub fn assign_tags(
+    conn: &mut PgConnection,
+    tenant_id: Uuid,
+    document: &Document,
+    raw_tag_ids: &[Uuid],
+    assigned_by: Option<Uuid>,
+) -> AppResult<usize> {
+    if raw_tag_ids.is_empty() {
+        return Ok(0);
+    }
+
+    let mut tag_ids: Vec<Uuid> = raw_tag_ids.iter().copied().collect();
+    tag_ids.sort_unstable();
+    tag_ids.dedup();
+
+    if tag_ids.is_empty() {
+        return Ok(0);
+    }
+
+    let existing: Vec<Uuid> = tags::table
+        .filter(tags::id.eq_any(&tag_ids))
+        .filter(tags::tenant_id.eq(tenant_id))
+        .select(tags::id)
+        .load(conn)?;
+
+    if existing.len() != tag_ids.len() {
+        return Err(AppError::bad_request("one or more tags do not exist"));
+    }
+
+    let new_tags: Vec<NewDocumentTag> = tag_ids
+        .into_iter()
+        .map(|tag_id| NewDocumentTag {
+            document_id: document.id,
+            tag_id,
+            assigned_by,
+            tenant_id,
+        })
+        .collect();
+
+    if new_tags.is_empty() {
+        return Ok(0);
+    }
+
+    let inserted = diesel::insert_into(document_tags::table)
+        .values(&new_tags)
+        .on_conflict_do_nothing()
+        .execute(conn)?;
+
+    Ok(inserted)
+}
+
+pub fn load_tags_for_documents(
+    conn: &mut PgConnection,
+    document_ids: &[Uuid],
+) -> AppResult<HashMap<Uuid, Vec<Tag>>> {
+    if document_ids.is_empty() {
+        return Ok(HashMap::new());
+    }
+
+    let rows: Vec<(Uuid, Tag)> = document_tags::table
+        .inner_join(tags::table)
+        .filter(document_tags::document_id.eq_any(document_ids))
+        .select((document_tags::document_id, tags::all_columns))
+        .load(conn)?;
+
+    let mut map: HashMap<Uuid, Vec<Tag>> = HashMap::new();
+    for (doc_id, tag) in rows {
+        map.entry(doc_id).or_default().push(tag);
+    }
+    Ok(map)
+}

backend/src/error.rs

@@ -12,6 +12,7 @@ pub type AppResult<T> = Result<T, AppError>;
 pub struct AppError {
     status: StatusCode,
     message: String,
+    code: Option<String>,
 }
 
 impl AppError {
@@ -19,6 +20,7 @@ impl AppError {
         Self {
             status,
             message: message.into(),
+            code: None,
         }
     }
 
@@ -26,6 +28,10 @@ impl AppError {
         Self::new(StatusCode::BAD_REQUEST, message)
     }
 
+    pub fn conflict(message: impl Into<String>) -> Self {
+        Self::new(StatusCode::CONFLICT, message)
+    }
+
     pub fn unauthorized() -> Self {
         Self::new(StatusCode::UNAUTHORIZED, "unauthorized")
     }
@@ -37,6 +43,11 @@ impl AppError {
     pub fn internal<E: Display>(error: E) -> Self {
         Self::new(StatusCode::INTERNAL_SERVER_ERROR, error.to_string())
     }
+
+    pub fn with_code(mut self, code: impl Into<String>) -> Self {
+        self.code = Some(code.into());
+        self
+    }
 }
 
 impl IntoResponse for AppError {
@@ -44,6 +55,7 @@ impl IntoResponse for AppError {
         let status = self.status;
         let body = Json(ErrorResponse {
             error: self.message,
+            code: self.code,
         });
         (status, body).into_response()
     }
@@ -52,6 +64,8 @@ impl IntoResponse for AppError {
 #[derive(Serialize)]
 struct ErrorResponse {
     error: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    code: Option<String>,
 }
 
 impl From<diesel::result::Error> for AppError {

backend/src/jobs.rs

@@ -30,6 +30,7 @@ pub type JobQueueResult<T> = Result<T, JobQueueError>;
 
 pub fn enqueue_job(
     conn: &mut PgConnection,
+    tenant_id: Uuid,
     job_type: &str,
     payload: Value,
     run_after: Option<NaiveDateTime>,
@@ -40,6 +41,7 @@ pub fn enqueue_job(
         payload,
         status: STATUS_QUEUED.to_string(),
         run_after: run_after.unwrap_or_else(|| Utc::now().naive_utc()),
+        tenant_id,
     };
 
     diesel::insert_into(jobs::table)

backend/src/lib.rs

@@ -1,14 +1,17 @@
 pub mod auth;
 pub mod config;
 pub mod db;
+pub mod documents;
 pub mod error;
 pub mod jobs;
 pub mod models;
+pub mod openapi;
 pub mod routes;
 pub mod s3;
 pub mod schema;
 pub mod state;
 pub mod storage;
+pub mod tenants;
 pub mod utils;
 pub mod workers;
 pub use workers::{default_handlers, Worker};

backend/src/main.rs

@@ -1,57 +1,28 @@
 use std::net::SocketAddr;
-use std::sync::Arc;
 
 use tokio::net::TcpListener;
 use tower::make::Shared;
-use tracing_subscriber::EnvFilter;
 
-use backend::auth::jwt::JwtService;
+use backend::{routes, utils::bootstrap::init_component};
-use backend::config::AppConfig;
-use backend::db;
-use backend::routes;
-use backend::s3::build_client;
-use backend::state::AppState;
-use backend::storage::S3Storage;
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
-    dotenv::dotenv().ok();
+    let state = init_component("api", None).await?;
-    init_tracing();
+    let server_host = state.config.server_host.clone();
-
+    let server_port = state.config.server_port;
-    let config = AppConfig::from_env()?;
     tracing::info!(
         component = "api",
-        database_url = %config.redacted_database_url(),
+        server_host = %server_host,
-        pool_size = config.database_max_pool_size,
+        server_port,
-        server_host = %config.server_host,
+        "starting api server"
-        server_port = config.server_port,
-        quickwit_enabled = config.quickwit_endpoint.is_some(),
-        s3_bucket = %config.s3_bucket,
-        "loaded backend configuration"
     );
-    let pool = db::init_pool_with_size(&config.database_url, config.database_max_pool_size)?;
-    let s3_client = build_client(&config).await?;
-    let storage = Arc::new(S3Storage::new(s3_client, config.s3_bucket.clone()));
-    let jwt = JwtService::from_config(&config)?;
 
-    let state = AppState::new(pool, config, storage, jwt);
+    let router = routes::create_router(state.as_ref().clone());
 
-    let router = routes::create_router(state.clone());
+    let addr: SocketAddr = format!("{}:{}", server_host, server_port).parse()?;
-
-    let addr: SocketAddr =
-        format!("{}:{}", state.config.server_host, state.config.server_port).parse()?;
     let listener = TcpListener::bind(addr).await?;
     tracing::info!("listening on {}", addr);
 
     axum::serve(listener, Shared::new(router)).await?;
     Ok(())
 }
-
-fn init_tracing() {
-    let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info"));
-    tracing_subscriber::fmt()
-        .with_env_filter(filter)
-        .with_target(false)
-        .compact()
-        .init();
-}

backend/src/models.rs

@@ -4,13 +4,48 @@ use uuid::Uuid;
 
 use crate::schema::*;
 
+#[derive(Debug, Clone, Queryable, Identifiable, Associations)]
+#[diesel(table_name = user_memberships)]
+#[diesel(belongs_to(User, foreign_key = user_id))]
+#[diesel(belongs_to(Tenant, foreign_key = tenant_id))]
+pub struct UserMembership {
+    pub id: Uuid,
+    pub user_id: Uuid,
+    pub tenant_id: Uuid,
+    pub role: String,
+    pub created_at: NaiveDateTime,
+    pub updated_at: NaiveDateTime,
+}
+
+#[derive(Debug, Insertable)]
+#[diesel(table_name = user_memberships)]
+pub struct NewUserMembership {
+    pub id: Uuid,
+    pub user_id: Uuid,
+    pub tenant_id: Uuid,
+    pub role: String,
+}
+
+#[derive(Debug, Clone, Queryable, Identifiable)]
+#[diesel(table_name = tenants)]
+#[diesel(primary_key(id))]
+pub struct Tenant {
+    pub id: Uuid,
+    pub slug: String,
+    pub storage_root: Option<String>,
+    pub quickwit_index: Option<String>,
+    pub status: String,
+    pub config: serde_json::Value,
+    pub created_at: NaiveDateTime,
+    pub updated_at: NaiveDateTime,
+}
+
 #[derive(Debug, Clone, Queryable, Identifiable)]
 #[diesel(table_name = users)]
 pub struct User {
     pub id: Uuid,
     pub username: String,
     pub password_hash: String,
-    pub role: String,
     pub created_at: NaiveDateTime,
     pub updated_at: NaiveDateTime,
 }
@@ -21,7 +56,35 @@ pub struct NewUser {
     pub id: Uuid,
     pub username: String,
     pub password_hash: String,
-    pub role: String,
+}
+
+#[derive(Debug, Clone, Queryable, Identifiable, Associations)]
+#[diesel(table_name = webdav_tokens)]
+#[diesel(belongs_to(User))]
+#[diesel(belongs_to(Tenant))]
+pub struct WebdavToken {
+    pub id: Uuid,
+    pub user_id: Uuid,
+    pub tenant_id: Uuid,
+    pub token_prefix: String,
+    pub token_hash: String,
+    pub label: Option<String>,
+    pub created_at: NaiveDateTime,
+    pub last_used_at: Option<NaiveDateTime>,
+    pub expires_at: Option<NaiveDateTime>,
+    pub revoked_at: Option<NaiveDateTime>,
+}
+
+#[derive(Debug, Insertable)]
+#[diesel(table_name = webdav_tokens)]
+pub struct NewWebdavToken {
+    pub id: Uuid,
+    pub user_id: Uuid,
+    pub tenant_id: Uuid,
+    pub token_prefix: String,
+    pub token_hash: String,
+    pub label: Option<String>,
+    pub expires_at: Option<NaiveDateTime>,
 }
 
 #[derive(Debug, Clone, Queryable, Identifiable)]
@@ -32,6 +95,7 @@ pub struct Folder {
     pub parent_id: Option<Uuid>,
     pub created_at: NaiveDateTime,
     pub updated_at: NaiveDateTime,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Insertable)]
@@ -40,6 +104,7 @@ pub struct NewFolder {
     pub id: Uuid,
     pub name: String,
     pub parent_id: Option<Uuid>,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Clone, Queryable, Identifiable, Associations)]
@@ -58,6 +123,7 @@ pub struct Document {
     pub issued_at: Option<NaiveDateTime>,
     pub title: String,
     pub current_version_id: Uuid,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Insertable)]
@@ -72,6 +138,7 @@ pub struct NewDocument {
     pub metadata: serde_json::Value,
     pub issued_at: Option<NaiveDateTime>,
     pub title: String,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Clone, Queryable, Identifiable, Associations)]
@@ -85,8 +152,8 @@ pub struct DocumentVersion {
     pub size_bytes: i64,
     pub checksum: String,
     pub created_at: NaiveDateTime,
-    pub operations_summary: serde_json::Value,
     pub metadata: serde_json::Value,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Insertable)]
@@ -98,8 +165,8 @@ pub struct NewDocumentVersion {
     pub s3_key: String,
     pub size_bytes: i64,
     pub checksum: String,
-    pub operations_summary: serde_json::Value,
     pub metadata: serde_json::Value,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Clone, Queryable, Identifiable, Associations)]
@@ -109,10 +176,11 @@ pub struct DocumentAsset {
     pub id: Uuid,
     pub document_version_id: Uuid,
     pub asset_type: String,
-    pub s3_key: String,
     pub mime_type: String,
     pub metadata: serde_json::Value,
     pub created_at: NaiveDateTime,
+    pub cardinality: Option<i32>,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Insertable)]
@@ -121,9 +189,33 @@ pub struct NewDocumentAsset {
     pub id: Uuid,
     pub document_version_id: Uuid,
     pub asset_type: String,
-    pub s3_key: String,
     pub mime_type: String,
     pub metadata: serde_json::Value,
+    pub cardinality: Option<i32>,
+    pub tenant_id: Uuid,
+}
+
+#[derive(Debug, Clone, Queryable, Identifiable, Associations)]
+#[diesel(table_name = document_asset_objects)]
+#[diesel(belongs_to(DocumentAsset, foreign_key = asset_id))]
+pub struct DocumentAssetObject {
+    pub id: Uuid,
+    pub asset_id: Uuid,
+    pub ordinal: i32,
+    pub s3_key: String,
+    pub metadata: serde_json::Value,
+    pub tenant_id: Uuid,
+}
+
+#[derive(Debug, Insertable)]
+#[diesel(table_name = document_asset_objects)]
+pub struct NewDocumentAssetObject {
+    pub id: Uuid,
+    pub asset_id: Uuid,
+    pub ordinal: i32,
+    pub s3_key: String,
+    pub metadata: serde_json::Value,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Clone, Queryable, Identifiable)]
@@ -138,6 +230,7 @@ pub struct Job {
     pub last_error: Option<String>,
     pub created_at: NaiveDateTime,
     pub updated_at: NaiveDateTime,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Insertable)]
@@ -148,6 +241,7 @@ pub struct NewJob {
     pub payload: serde_json::Value,
     pub status: String,
     pub run_after: NaiveDateTime,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Clone, Queryable, Identifiable)]
@@ -157,6 +251,7 @@ pub struct Tag {
     pub label: String,
     pub color: Option<String>,
     pub created_at: NaiveDateTime,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Insertable)]
@@ -165,6 +260,7 @@ pub struct NewTag {
     pub id: Uuid,
     pub label: String,
     pub color: Option<String>,
+    pub tenant_id: Uuid,
 }
 
 #[allow(dead_code)]
@@ -178,6 +274,7 @@ pub struct DocumentTag {
     pub tag_id: Uuid,
     pub assigned_at: NaiveDateTime,
     pub assigned_by: Option<Uuid>,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Insertable)]
@@ -186,6 +283,7 @@ pub struct NewDocumentTag {
     pub document_id: Uuid,
     pub tag_id: Uuid,
     pub assigned_by: Option<Uuid>,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Clone, Queryable, Identifiable)]
@@ -196,6 +294,7 @@ pub struct Correspondent {
     pub metadata: serde_json::Value,
     pub created_at: NaiveDateTime,
     pub updated_at: NaiveDateTime,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Insertable)]
@@ -204,19 +303,20 @@ pub struct NewCorrespondent {
     pub id: Uuid,
     pub name: String,
     pub metadata: serde_json::Value,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Clone, Queryable, Associations)]
 #[diesel(table_name = document_correspondents)]
 #[diesel(belongs_to(Document))]
 #[diesel(belongs_to(Correspondent))]
-#[diesel(primary_key(document_id, correspondent_id, role))]
+#[diesel(primary_key(document_id, correspondent_id))]
 pub struct DocumentCorrespondent {
     pub document_id: Uuid,
     pub correspondent_id: Uuid,
-    pub role: String,
     pub assigned_at: NaiveDateTime,
     pub assigned_by: Option<Uuid>,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Insertable)]
@@ -224,8 +324,8 @@ pub struct DocumentCorrespondent {
 pub struct NewDocumentCorrespondent {
     pub document_id: Uuid,
     pub correspondent_id: Uuid,
-    pub role: String,
     pub assigned_by: Option<Uuid>,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Clone, Queryable, Identifiable, Associations)]
@@ -240,6 +340,7 @@ pub struct RefreshToken {
     pub revoked_at: Option<NaiveDateTime>,
     pub created_at: NaiveDateTime,
     pub updated_at: NaiveDateTime,
+    pub tenant_id: Uuid,
 }
 
 #[derive(Debug, Insertable)]
@@ -250,4 +351,5 @@ pub struct NewRefreshToken {
     pub token_hash: String,
     pub issued_at: NaiveDateTime,
     pub expires_at: NaiveDateTime,
+    pub tenant_id: Uuid,
 }

backend/src/routes/auth.rs

@@ -1,11 +1,15 @@
 use axum::{
     extract::State,
     http::{header::SET_COOKIE, HeaderMap, HeaderValue, StatusCode},
+    response::{IntoResponse, Response},
     Json,
 };
-use axum_extra::{headers::Cookie, typed_header::TypedHeader};
+use axum_extra::{
+    headers::{authorization::Bearer, Authorization, Cookie},
+    typed_header::TypedHeader,
+};
 use chrono::{Duration as ChronoDuration, Utc};
-use diesel::prelude::*;
+use diesel::{pg::PgConnection, prelude::*};
 use rand::{rngs::OsRng, RngCore};
 use serde::{Deserialize, Serialize};
 use sha2::{Digest, Sha256};
@@ -14,8 +18,11 @@ use uuid::Uuid;
 use crate::{
     auth::{password, AuthenticatedUser},
     error::{AppError, AppResult},
-    models::{NewRefreshToken, RefreshToken, User},
+    models::{NewRefreshToken, RefreshToken, Tenant, User, UserMembership},
-    schema::{refresh_tokens, users::dsl},
+    schema::{
+        refresh_tokens, tenants::dsl as tenant_dsl, user_memberships::dsl as memberships_dsl,
+        users::dsl,
+    },
     state::AppState,
 };
 
@@ -27,6 +34,8 @@ const REFRESH_COOKIE_NAME: &str = "refresh_token";
 pub struct LoginRequest {
     pub username: String,
     pub password: String,
+    #[serde(default)]
+    pub preferred_tenant_slug: Option<String>,
 }
 
 #[derive(Serialize)]
@@ -34,17 +43,46 @@ pub struct LoginResponse {
     pub access_token: String,
     pub token_type: String,
     pub expires_in: i64,
+    pub tenant: TenantSnippet,
+}
+
+#[derive(Serialize)]
+pub struct TenantSnippet {
+    pub id: Uuid,
+    pub slug: String,
+}
+
+#[derive(Serialize)]
+pub struct TenantSelectionResponse {
+    pub access_token: String,
+    pub tenants: Vec<TenantSnippet>,
+}
+
+#[derive(Serialize)]
+pub struct TenantListResponse {
+    pub tenants: Vec<TenantSnippet>,
+}
+
+#[derive(Deserialize)]
+pub struct TenantSelectionRequest {
+    pub tenant_id: Uuid,
 }
 
 pub async fn login(
     State(state): State<AppState>,
     Json(payload): Json<LoginRequest>,
-) -> AppResult<(HeaderMap, Json<LoginResponse>)> {
+) -> AppResult<Response> {
-    let mut conn = state.db()?;
+    let mut conn = state.db_unscoped()?;
 
-    let user: User = dsl::users
+    let user: Option<User> = dsl::users
         .filter(dsl::username.eq(&payload.username))
-        .first(&mut conn)?;
+        .first(&mut conn)
+        .optional()?;
+
+    let user = match user {
+        Some(user) => user,
+        None => return Err(AppError::unauthorized()),
+    };
 
     let valid = password::verify_password(&payload.password, &user.password_hash)
         .map_err(|_| AppError::unauthorized())?;
@@ -53,55 +91,67 @@ pub async fn login(
         return Err(AppError::unauthorized());
     }
 
-    let access_token = state
+    let memberships: Vec<(UserMembership, Tenant)> = memberships_dsl::user_memberships
+        .inner_join(tenant_dsl::tenants)
+        .filter(memberships_dsl::user_id.eq(user.id))
+        .load(&mut conn)?;
+
+    if memberships.is_empty() {
+        return Err(AppError::unauthorized());
+    }
+
+    let preferred_slug = payload
+        .preferred_tenant_slug
+        .as_ref()
+        .map(|slug| slug.trim().to_string())
+        .filter(|slug| !slug.is_empty());
+
+    if let Some(tenant) = preferred_slug.as_ref().and_then(|slug| {
+        memberships
+            .iter()
+            .find(|(_, tenant)| tenant.slug.eq_ignore_ascii_case(slug))
+    }) {
+        return issue_session(&state, &mut conn, &user, tenant.1.id);
+    }
+
+    if memberships.len() == 1 {
+        let tenant_id = memberships[0].1.id;
+        return issue_session(&state, &mut conn, &user, tenant_id);
+    }
+
+    let selection_token = state
         .jwt
-        .generate_token(user.id, &user.username, &user.role)
+        .generate_tenant_selector_token(user.id)
         .map_err(AppError::from)?;
 
-    let now = Utc::now();
+    let tenants = memberships
-    let refresh_value = generate_refresh_token();
+        .into_iter()
-    let refresh_hash = hash_refresh_token(&refresh_value);
+        .map(|(_, tenant)| TenantSnippet {
-    let refresh_expires_at = now + ChronoDuration::days(state.config.refresh_token_expiry_days);
+            id: tenant.id,
+            slug: tenant.slug,
+        })
+        .collect();
 
-    let new_refresh = NewRefreshToken {
+    let response = Json(TenantSelectionResponse {
-        id: Uuid::new_v4(),
+        access_token: selection_token,
-        user_id: user.id,
+        tenants,
-        token_hash: refresh_hash,
+    })
-        issued_at: now.naive_utc(),
+    .into_response();
-        expires_at: refresh_expires_at.naive_utc(),
-    };
 
-    diesel::insert_into(refresh_tokens::table)
+    Ok(response)
-        .values(&new_refresh)
-        .execute(&mut conn)?;
-
-    let mut headers = HeaderMap::new();
-    headers.insert(
-        SET_COOKIE,
-        build_refresh_cookie(&state, &refresh_value, refresh_expires_at),
-    );
-
-    Ok((
-        headers,
-        Json(LoginResponse {
-            access_token,
-            token_type: "Bearer".to_string(),
-            expires_in: state.config.jwt_expiry_minutes * 60,
-        }),
-    ))
 }
 
 pub async fn refresh(
     State(state): State<AppState>,
     jar: Option<TypedHeader<Cookie>>,
-) -> AppResult<(HeaderMap, Json<LoginResponse>)> {
+) -> AppResult<Response> {
     let cookies = jar.ok_or_else(AppError::unauthorized)?;
     let refresh_value = cookies
         .get(REFRESH_COOKIE_NAME)
         .ok_or_else(AppError::unauthorized)?;
 
     let hashed = hash_refresh_token(refresh_value);
-    let mut conn = state.db()?;
+    let mut conn = state.db_unscoped()?;
     let now = Utc::now();
     let now_naive = now.naive_utc();
 
@@ -128,41 +178,43 @@ pub async fn refresh(
         .first(&mut conn)
         .map_err(AppError::from)?;
 
-    let access_token = state
+    issue_session(&state, &mut conn, &user, token.tenant_id)
+}
+
+pub async fn select_tenant(
+    State(state): State<AppState>,
+    TypedHeader(Authorization(bearer)): TypedHeader<Authorization<Bearer>>,
+    Json(payload): Json<TenantSelectionRequest>,
+) -> AppResult<Response> {
+    let user_id = match state.jwt.verify_tenant_selector_token(bearer.token()) {
+        Ok(claims) => claims.sub,
+        Err(_) => state
             .jwt
-        .generate_token(user.id, &user.username, &user.role)
+            .verify_token(bearer.token())
-        .map_err(AppError::from)?;
+            .map(|claims| claims.sub)
-
+            .map_err(|_| AppError::unauthorized())?,
-    let new_refresh_value = generate_refresh_token();
-    let new_refresh_hash = hash_refresh_token(&new_refresh_value);
-    let new_refresh_expires = now + ChronoDuration::days(state.config.refresh_token_expiry_days);
-
-    let new_refresh = NewRefreshToken {
-        id: Uuid::new_v4(),
-        user_id: user.id,
-        token_hash: new_refresh_hash,
-        issued_at: now_naive,
-        expires_at: new_refresh_expires.naive_utc(),
     };
 
-    diesel::insert_into(refresh_tokens::table)
+    let mut conn = state.db_unscoped()?;
-        .values(&new_refresh)
-        .execute(&mut conn)?;
 
-    let mut headers = HeaderMap::new();
+    let membership_exists = memberships_dsl::user_memberships
-    headers.insert(
+        .filter(memberships_dsl::user_id.eq(user_id))
-        SET_COOKIE,
+        .filter(memberships_dsl::tenant_id.eq(payload.tenant_id))
-        build_refresh_cookie(&state, &new_refresh_value, new_refresh_expires),
+        .inner_join(tenant_dsl::tenants)
-    );
+        .select(memberships_dsl::id)
+        .first::<Uuid>(&mut conn)
+        .optional()?;
 
-    Ok((
+    if membership_exists.is_none() {
-        headers,
+        return Err(AppError::unauthorized());
-        Json(LoginResponse {
+    }
-            access_token,
+
-            token_type: "Bearer".to_string(),
+    let user: User = dsl::users
-            expires_in: state.config.jwt_expiry_minutes * 60,
+        .find(user_id)
-        }),
+        .first(&mut conn)
-    ))
+        .map_err(AppError::from)?;
+
+    issue_session(&state, &mut conn, &user, payload.tenant_id)
 }
 
 pub async fn logout(
@@ -170,7 +222,7 @@ pub async fn logout(
     user: AuthenticatedUser,
     jar: Option<TypedHeader<Cookie>>,
 ) -> AppResult<(HeaderMap, StatusCode)> {
-    let mut conn = state.db()?;
+    let mut conn = state.db_unscoped()?;
     let now = Utc::now().naive_utc();
     let mut rows_affected = 0;
 
@@ -214,6 +266,92 @@ pub async fn me(user: AuthenticatedUser) -> Json<AuthenticatedUser> {
     Json(user)
 }
 
+pub async fn list_tenants(
+    State(state): State<AppState>,
+    auth: Option<TypedHeader<Authorization<Bearer>>>,
+) -> AppResult<Json<TenantListResponse>> {
+    let bearer = auth.ok_or_else(AppError::unauthorized)?;
+    let token = bearer.token();
+
+    let user_id = match state.jwt.verify_token(token) {
+        Ok(claims) => claims.sub,
+        Err(_) => {
+            let claims = state
+                .jwt
+                .verify_tenant_selector_token(token)
+                .map_err(|_| AppError::unauthorized())?;
+            claims.sub
+        }
+    };
+
+    let mut conn = state.db_unscoped()?;
+
+    let tenants = memberships_dsl::user_memberships
+        .inner_join(tenant_dsl::tenants)
+        .filter(memberships_dsl::user_id.eq(user_id))
+        .select((tenant_dsl::id, tenant_dsl::slug))
+        .load::<(Uuid, String)>(&mut conn)?
+        .into_iter()
+        .map(|(id, slug)| TenantSnippet { id, slug })
+        .collect();
+
+    Ok(Json(TenantListResponse { tenants }))
+}
+
+fn issue_session(
+    state: &AppState,
+    conn: &mut PgConnection,
+    user: &User,
+    tenant_id: Uuid,
+) -> AppResult<Response> {
+    let now = Utc::now();
+    let access_token = state
+        .jwt
+        .generate_token(user.id, tenant_id, &user.username)
+        .map_err(AppError::from)?;
+
+    let tenant_slug: String = tenant_dsl::tenants
+        .find(tenant_id)
+        .select(tenant_dsl::slug)
+        .first(conn)
+        .map_err(AppError::from)?;
+
+    let refresh_value = generate_refresh_token();
+    let refresh_hash = hash_refresh_token(&refresh_value);
+    let refresh_expires_at = now + ChronoDuration::days(state.config.refresh_token_expiry_days);
+
+    let new_refresh = NewRefreshToken {
+        id: Uuid::new_v4(),
+        user_id: user.id,
+        token_hash: refresh_hash,
+        issued_at: now.naive_utc(),
+        expires_at: refresh_expires_at.naive_utc(),
+        tenant_id,
+    };
+
+    diesel::insert_into(refresh_tokens::table)
+        .values(&new_refresh)
+        .execute(conn)?;
+
+    let mut response = Json(LoginResponse {
+        access_token,
+        token_type: "Bearer".to_string(),
+        expires_in: state.config.jwt_expiry_minutes * 60,
+        tenant: TenantSnippet {
+            id: tenant_id,
+            slug: tenant_slug,
+        },
+    })
+    .into_response();
+
+    response.headers_mut().insert(
+        SET_COOKIE,
+        build_refresh_cookie(state, &refresh_value, refresh_expires_at),
+    );
+
+    Ok(response)
+}
+
 fn hash_refresh_token(token: &str) -> String {
     let mut hasher = Sha256::new();
     hasher.update(token.as_bytes());

backend/src/routes/correspondents.rs

@@ -1,11 +1,6 @@
-use std::collections::{BTreeMap, HashMap};
+use std::collections::HashMap;
 
-use axum::{
+use axum::{extract::Path, http::StatusCode, Json};
-    extract::{Path, State},
-    http::StatusCode,
-    response::IntoResponse,
-    Json,
-};
 use chrono::Utc;
 use diesel::{dsl::count_star, prelude::*, result::DatabaseErrorKind, PgConnection};
 use serde::{Deserialize, Serialize};
@@ -13,19 +8,19 @@ use serde_json::Value;
 use uuid::Uuid;
 
 use crate::{
+    auth::TenantScopedConn,
     error::{AppError, AppResult},
     models::{Correspondent, NewCorrespondent},
     schema::{correspondents, document_correspondents},
-    state::AppState,
+    utils::{
+        db::{no_content, EnsureEntity, IntoJsonResponse},
+        time::to_iso,
+    },
 };
 
-use super::documents::to_iso;
-
 #[derive(Serialize)]
 pub struct CorrespondentUsage {
     pub total: i64,
-    #[serde(default, skip_serializing_if = "BTreeMap::is_empty")]
-    pub by_role: BTreeMap<String, i64>,
 }
 
 #[derive(Serialize)]
@@ -59,45 +54,43 @@ struct CorrespondentChangeset<'a> {
 }
 
 pub async fn list_correspondents(
-    State(state): State<AppState>,
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        ..
+    }: TenantScopedConn,
 ) -> AppResult<Json<Vec<CorrespondentSummary>>> {
-    let mut conn = state.db()?;
-
     let correspondents_list: Vec<Correspondent> = correspondents::table
+        .filter(correspondents::tenant_id.eq(tenant_id))
         .order(correspondents::name.asc())
         .load(&mut conn)?;
 
-    let usage_rows: Vec<(Uuid, String, i64)> = document_correspondents::table
+    let usage_rows: Vec<(Uuid, i64)> = document_correspondents::table
-        .group_by((
+        .filter(document_correspondents::tenant_id.eq(tenant_id))
-            document_correspondents::correspondent_id,
+        .group_by(document_correspondents::correspondent_id)
-            document_correspondents::role,
+        .select((document_correspondents::correspondent_id, count_star()))
-        ))
-        .select((
-            document_correspondents::correspondent_id,
-            document_correspondents::role,
-            count_star(),
-        ))
         .load(&mut conn)?;
 
-    let mut usage_map: HashMap<Uuid, BTreeMap<String, i64>> = HashMap::new();
+    let mut usage_map: HashMap<Uuid, i64> = HashMap::new();
-    for (correspondent_id, role, count) in usage_rows {
+    for (correspondent_id, count) in usage_rows {
-        usage_map
+        usage_map.insert(correspondent_id, count);
-            .entry(correspondent_id)
-            .or_default()
-            .insert(role, count);
     }
 
     let mut response = Vec::with_capacity(correspondents_list.len());
     for correspondent in correspondents_list {
-        let role_counts = usage_map.remove(&correspondent.id).unwrap_or_default();
+        let total = usage_map.remove(&correspondent.id).unwrap_or(0);
-        response.push(build_summary(correspondent, role_counts));
+        response.push(build_summary(correspondent, total));
     }
 
-    Ok(Json(response))
+    response.into_json()
 }
 
 pub async fn create_correspondent(
-    State(state): State<AppState>,
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        ..
+    }: TenantScopedConn,
     Json(payload): Json<CreateCorrespondentRequest>,
 ) -> AppResult<Json<CorrespondentSummary>> {
     let name = payload.name.trim();
@@ -111,9 +104,9 @@ pub async fn create_correspondent(
         id: new_id,
         name: name.to_string(),
         metadata: metadata_value,
+        tenant_id,
     };
 
-    let mut conn = state.db()?;
     match diesel::insert_into(correspondents::table)
         .values(&new_correspondent)
         .execute(&mut conn)
@@ -125,19 +118,29 @@ pub async fn create_correspondent(
         Err(err) => return Err(AppError::from(err)),
     }
 
-    let correspondent: Correspondent = correspondents::table.find(new_id).first(&mut conn)?;
+    let correspondent: Correspondent = correspondents::table
-    Ok(Json(build_summary(correspondent, BTreeMap::new())))
+        .find(new_id)
+        .filter(correspondents::tenant_id.eq(tenant_id))
+        .first(&mut conn)
+        .one()?;
+
+    build_summary(correspondent, 0).into_json()
 }
 
 pub async fn update_correspondent(
-    State(state): State<AppState>,
     Path(correspondent_id): Path<Uuid>,
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        ..
+    }: TenantScopedConn,
     Json(payload): Json<UpdateCorrespondentRequest>,
 ) -> AppResult<Json<CorrespondentSummary>> {
-    let mut conn = state.db()?;
     let existing: Correspondent = correspondents::table
         .find(correspondent_id)
-        .first(&mut conn)?;
+        .filter(correspondents::tenant_id.eq(tenant_id))
+        .first(&mut conn)
+        .one()?;
 
     let mut new_name: Option<String> = None;
     if let Some(ref candidate) = payload.name {
@@ -149,6 +152,7 @@ pub async fn update_correspondent(
             let duplicate = correspondents::table
                 .filter(correspondents::name.eq(trimmed))
                 .filter(correspondents::id.ne(correspondent_id))
+                .filter(correspondents::tenant_id.eq(tenant_id))
                 .first::<Correspondent>(&mut conn)
                 .optional()?;
             if duplicate.is_some() {
@@ -167,8 +171,8 @@ pub async fn update_correspondent(
     }
 
     if new_name.is_none() && new_metadata.is_none() {
-        let usage = load_usage_for_correspondent(&mut conn, correspondent_id)?;
+        let usage = load_usage_for_correspondent(&mut conn, tenant_id, correspondent_id)?;
-        return Ok(Json(build_summary(existing.clone(), usage)));
+        return build_summary(existing.clone(), usage).into_json();
     }
 
     let mut changeset = CorrespondentChangeset::default();
@@ -180,24 +184,33 @@ pub async fn update_correspondent(
     }
 
     let now = Utc::now().naive_utc();
-    diesel::update(correspondents::table.find(correspondent_id))
+    diesel::update(
+        correspondents::table
+            .find(correspondent_id)
+            .filter(correspondents::tenant_id.eq(tenant_id)),
+    )
     .set((&changeset, correspondents::updated_at.eq(now)))
     .execute(&mut conn)?;
 
     let updated: Correspondent = correspondents::table
         .find(correspondent_id)
-        .first(&mut conn)?;
+        .filter(correspondents::tenant_id.eq(tenant_id))
-    let usage = load_usage_for_correspondent(&mut conn, correspondent_id)?;
+        .first(&mut conn)
-    Ok(Json(build_summary(updated, usage)))
+        .one()?;
+    let usage = load_usage_for_correspondent(&mut conn, tenant_id, correspondent_id)?;
+    build_summary(updated, usage).into_json()
 }
 
 pub async fn delete_correspondent(
-    State(state): State<AppState>,
     Path(correspondent_id): Path<Uuid>,
-) -> AppResult<impl IntoResponse> {
+    TenantScopedConn {
-    let mut conn = state.db()?;
+        mut conn,
-
+        tenant_id,
+        ..
+    }: TenantScopedConn,
+) -> AppResult<StatusCode> {
     let usage: i64 = document_correspondents::table
+        .filter(document_correspondents::tenant_id.eq(tenant_id))
         .filter(document_correspondents::correspondent_id.eq(correspondent_id))
         .select(count_star())
         .first(&mut conn)?;
@@ -208,29 +221,26 @@ pub async fn delete_correspondent(
         ));
     }
 
-    let deleted =
+    let deleted = diesel::delete(
-        diesel::delete(correspondents::table.find(correspondent_id)).execute(&mut conn)?;
+        correspondents::table
+            .filter(correspondents::id.eq(correspondent_id))
+            .filter(correspondents::tenant_id.eq(tenant_id)),
+    )
+    .execute(&mut conn)?;
     if deleted == 0 {
         return Err(AppError::not_found());
     }
-    Ok(StatusCode::NO_CONTENT)
+    no_content()
 }
 
-fn build_summary(
+fn build_summary(correspondent: Correspondent, total: i64) -> CorrespondentSummary {
-    correspondent: Correspondent,
-    role_counts: BTreeMap<String, i64>,
-) -> CorrespondentSummary {
-    let total = role_counts.values().copied().sum();
     CorrespondentSummary {
         id: correspondent.id,
         name: correspondent.name,
         metadata: correspondent.metadata,
         created_at: to_iso(correspondent.created_at),
         updated_at: to_iso(correspondent.updated_at),
-        usage: CorrespondentUsage {
+        usage: CorrespondentUsage { total },
-            total,
-            by_role: role_counts,
-        },
     }
 }
 
@@ -243,17 +253,14 @@ fn normalize_metadata(input: Option<Value>) -> Value {
 
 fn load_usage_for_correspondent(
     conn: &mut PgConnection,
+    tenant_id: Uuid,
     correspondent_id: Uuid,
-) -> AppResult<BTreeMap<String, i64>> {
+) -> AppResult<i64> {
-    let rows: Vec<(String, i64)> = document_correspondents::table
+    let total: i64 = document_correspondents::table
         .filter(document_correspondents::correspondent_id.eq(correspondent_id))
-        .group_by(document_correspondents::role)
+        .filter(document_correspondents::tenant_id.eq(tenant_id))
-        .select((document_correspondents::role, count_star()))
+        .select(count_star())
-        .load(conn)?;
+        .get_result(conn)?;
 
-    let mut map = BTreeMap::new();
+    Ok(total)
-    for (role, count) in rows {
-        map.insert(role, count);
-    }
-    Ok(map)
 }

backend/src/routes/folders.rs

@@ -4,19 +4,25 @@ use axum::{
 };
 use diesel::{dsl::exists, prelude::*, PgConnection};
 use serde::{Deserialize, Serialize};
+use serde_json::Value;
 use uuid::Uuid;
 
 use crate::models::{Document, Folder, NewFolder};
 use crate::schema::{documents, folders};
 use crate::state::AppState;
 use crate::{
-    auth::AuthenticatedUser,
+    auth::TenantScopedConn,
     error::{AppError, AppResult},
 };
 
-use super::documents::{
+use super::documents::{to_document_response, DocumentResponse};
-    load_correspondents_for_documents, load_primary_assets, load_tags_for_documents,
+use crate::documents::{
-    to_document_response, to_iso, DocumentResponse,
+    asset::load_primary_assets, correspondents::load_correspondents_for_documents,
+    tags::load_tags_for_documents,
+};
+use crate::utils::{
+    json::{classify_nullable, NullableValue},
+    time::to_iso,
 };
 
 #[derive(Deserialize)]
@@ -31,13 +37,6 @@ pub struct EnsureFolderPathRequest {
     pub segments: Vec<String>,
 }
 
-#[derive(Deserialize)]
-pub struct UpdateFolderRequest {
-    #[serde(default)]
-    pub parent_id: Option<Option<Uuid>>,
-    pub name: Option<String>,
-}
-
 #[derive(Serialize)]
 pub struct FolderResponse {
     pub folder: FolderInfo,
@@ -69,16 +68,36 @@ pub struct FolderInfo {
     pub updated_at: String,
 }
 
+pub async fn get_folder(
+    Path(folder_id): Path<Uuid>,
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        ..
+    }: TenantScopedConn,
+) -> AppResult<Json<FolderResponse>> {
+    let folder: Folder = folders::table
+        .find(folder_id)
+        .filter(folders::tenant_id.eq(tenant_id))
+        .first(&mut conn)?;
+
+    Ok(Json(FolderResponse {
+        folder: folder_to_info(folder),
+    }))
+}
+
 pub async fn ensure_folder_path(
-    State(state): State<AppState>,
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        ..
+    }: TenantScopedConn,
     Json(payload): Json<EnsureFolderPathRequest>,
 ) -> AppResult<Json<FolderResponse>> {
     if payload.segments.is_empty() {
         return Err(AppError::bad_request("segments must not be empty"));
     }
 
-    let mut conn = state.db()?;
-
     let target_folder = conn.transaction::<Folder, AppError, _>(|conn| {
         let mut current_parent = payload.parent_id;
         let mut last_folder: Option<Folder> = None;
@@ -91,12 +110,14 @@ pub async fn ensure_folder_path(
 
             let existing: Option<Folder> = if let Some(parent_id) = current_parent {
                 folders::table
+                    .filter(folders::tenant_id.eq(tenant_id))
                     .filter(folders::parent_id.eq(Some(parent_id)))
                     .filter(folders::name.eq(name))
                     .first(conn)
                     .optional()?
             } else {
                 folders::table
+                    .filter(folders::tenant_id.eq(tenant_id))
                     .filter(folders::parent_id.is_null())
                     .filter(folders::name.eq(name))
                     .first(conn)
@@ -110,15 +131,35 @@ pub async fn ensure_folder_path(
                     id: Uuid::new_v4(),
                     name: name.to_string(),
                     parent_id: current_parent,
+                    tenant_id,
                 };
 
-                diesel::insert_into(folders::table)
+                let inserted_id: Option<Uuid> = diesel::insert_into(folders::table)
                     .values(&new_folder)
-                    .execute(conn)?;
+                    .on_conflict_do_nothing()
+                    .returning(folders::id)
+                    .get_result(conn)
+                    .optional()?;
 
-                folders::table.find(new_folder.id).first(conn)?
+                if let Some(id) = inserted_id {
+                    folders::table
+                        .find(id)
+                        .filter(folders::tenant_id.eq(tenant_id))
+                        .first(conn)?
+                } else if let Some(parent_id) = current_parent {
+                    folders::table
+                        .filter(folders::tenant_id.eq(tenant_id))
+                        .filter(folders::parent_id.eq(Some(parent_id)))
+                        .filter(folders::name.eq(name))
+                        .first(conn)?
+                } else {
+                    folders::table
+                        .filter(folders::tenant_id.eq(tenant_id))
+                        .filter(folders::parent_id.is_null())
+                        .filter(folders::name.eq(name))
+                        .first(conn)?
+                }
             };
-
             current_parent = Some(folder.id);
             last_folder = Some(folder);
         }
@@ -132,26 +173,72 @@ pub async fn ensure_folder_path(
 }
 
 pub async fn create_folder(
-    State(state): State<AppState>,
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        ..
+    }: TenantScopedConn,
     Json(payload): Json<CreateFolderRequest>,
 ) -> AppResult<Json<FolderResponse>> {
     if payload.name.trim().is_empty() {
         return Err(AppError::bad_request("name must not be empty"));
     }
 
-    let mut conn = state.db()?;
+    let name = payload.name.trim();
 
-    let new_folder = NewFolder {
+    let existing: Option<Folder> = if let Some(parent_id) = payload.parent_id {
-        id: Uuid::new_v4(),
+        folders::table
-        name: payload.name.trim().to_string(),
+            .filter(folders::tenant_id.eq(tenant_id))
-        parent_id: payload.parent_id,
+            .filter(folders::parent_id.eq(Some(parent_id)))
+            .filter(folders::name.eq(name))
+            .first(&mut conn)
+            .optional()?
+    } else {
+        folders::table
+            .filter(folders::tenant_id.eq(tenant_id))
+            .filter(folders::parent_id.is_null())
+            .filter(folders::name.eq(name))
+            .first(&mut conn)
+            .optional()?
     };
 
-    diesel::insert_into(folders::table)
+    let folder: Folder = if let Some(folder) = existing {
+        folder
+    } else {
+        let new_folder = NewFolder {
+            id: Uuid::new_v4(),
+            name: name.to_string(),
+            parent_id: payload.parent_id,
+            tenant_id,
+        };
+
+        let inserted_id: Option<Uuid> = diesel::insert_into(folders::table)
             .values(&new_folder)
-        .execute(&mut conn)?;
+            .on_conflict_do_nothing()
+            .returning(folders::id)
+            .get_result(&mut conn)
+            .optional()?;
+
+        if let Some(id) = inserted_id {
+            folders::table
+                .find(id)
+                .filter(folders::tenant_id.eq(tenant_id))
+                .first(&mut conn)?
+        } else if let Some(parent_id) = payload.parent_id {
+            folders::table
+                .filter(folders::tenant_id.eq(tenant_id))
+                .filter(folders::parent_id.eq(Some(parent_id)))
+                .filter(folders::name.eq(name))
+                .first(&mut conn)?
+        } else {
+            folders::table
+                .filter(folders::tenant_id.eq(tenant_id))
+                .filter(folders::parent_id.is_null())
+                .filter(folders::name.eq(name))
+                .first(&mut conn)?
+        }
+    };
 
-    let folder: Folder = folders::table.find(new_folder.id).first(&mut conn)?;
     Ok(Json(FolderResponse {
         folder: folder_to_info(folder),
     }))
@@ -161,10 +248,13 @@ pub async fn list_folder_contents(
     State(state): State<AppState>,
     Path(folder_identifier): Path<String>,
     Query(query): Query<FolderContentsQuery>,
-    user: AuthenticatedUser,
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        user_id,
+        ..
+    }: TenantScopedConn,
 ) -> AppResult<Json<FolderContentsResponse>> {
-    let mut conn = state.db()?;
-
     let folder_id = if folder_identifier.eq_ignore_ascii_case("root") {
         None
     } else {
@@ -176,7 +266,10 @@ pub async fn list_folder_contents(
 
     let folder = match folder_id {
         Some(id) => Some(folder_to_info(
-            folders::table.find(id).first::<Folder>(&mut conn)?,
+            folders::table
+                .find(id)
+                .filter(folders::tenant_id.eq(tenant_id))
+                .first::<Folder>(&mut conn)?,
         )),
         None => None,
     };
@@ -184,11 +277,13 @@ pub async fn list_folder_contents(
     let child_folders: Vec<Folder> = if let Some(parent_id) = folder_id {
         folders::table
             .filter(folders::parent_id.eq(parent_id))
+            .filter(folders::tenant_id.eq(tenant_id))
             .order(folders::name.asc())
             .load(&mut conn)?
     } else {
         folders::table
             .filter(folders::parent_id.is_null())
+            .filter(folders::tenant_id.eq(tenant_id))
             .order(folders::name.asc())
             .load(&mut conn)?
     };
@@ -197,6 +292,7 @@ pub async fn list_folder_contents(
     let documents = if query.include_documents {
         let docs_query = documents::table
             .filter(documents::deleted_at.is_null())
+            .filter(documents::tenant_id.eq(tenant_id))
             .order(documents::uploaded_at.desc());
 
         let docs: Vec<Document> = if let Some(current_folder) = folder_id {
@@ -214,7 +310,7 @@ pub async fn list_folder_contents(
         let mut correspondents_map = load_correspondents_for_documents(&mut conn, &doc_ids)?;
         drop(conn);
 
-        let primary_versions = load_primary_assets(&state, &docs).await?;
+        let primary_versions = load_primary_assets(&state, tenant_id, &docs)?;
 
         let mut documents = Vec::with_capacity(doc_ids.len());
         for doc in docs {
@@ -223,7 +319,7 @@ pub async fn list_folder_contents(
             let current_version = primary_versions.get(&doc.id).cloned();
             documents.push(to_document_response(
                 &state,
-                user.user_id,
+                user_id,
                 doc,
                 tags,
                 correspondents,
@@ -244,16 +340,23 @@ pub async fn list_folder_contents(
 }
 
 pub async fn delete_folder(
-    State(state): State<AppState>,
     Path(folder_id): Path<Uuid>,
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        ..
+    }: TenantScopedConn,
 ) -> AppResult<StatusCode> {
-    let mut conn = state.db()?;
-
     conn.transaction::<_, AppError, _>(|conn| {
-        folders::table.find(folder_id).first::<Folder>(conn)?;
+        folders::table
+            .find(folder_id)
+            .filter(folders::tenant_id.eq(tenant_id))
+            .first::<Folder>(conn)?;
 
         let has_child_folders: bool = diesel::select(exists(
-            folders::table.filter(folders::parent_id.eq(Some(folder_id))),
+            folders::table
+                .filter(folders::parent_id.eq(Some(folder_id)))
+                .filter(folders::tenant_id.eq(tenant_id)),
         ))
         .get_result(conn)?;
 
@@ -266,6 +369,7 @@ pub async fn delete_folder(
         let has_documents: bool = diesel::select(exists(
             documents::table
                 .filter(documents::folder_id.eq(Some(folder_id)))
+                .filter(documents::tenant_id.eq(tenant_id))
                 .filter(documents::deleted_at.is_null()),
         ))
         .get_result(conn)?;
@@ -276,7 +380,12 @@ pub async fn delete_folder(
             ));
         }
 
-        diesel::delete(folders::table.find(folder_id)).execute(conn)?;
+        diesel::delete(
+            folders::table
+                .filter(folders::id.eq(folder_id))
+                .filter(folders::tenant_id.eq(tenant_id)),
+        )
+        .execute(conn)?;
 
         Ok(())
     })?;
@@ -285,43 +394,76 @@ pub async fn delete_folder(
 }
 
 pub async fn update_folder(
-    State(state): State<AppState>,
     Path(folder_id): Path<Uuid>,
-    Json(payload): Json<UpdateFolderRequest>,
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        ..
+    }: TenantScopedConn,
+    Json(body): Json<Value>,
 ) -> AppResult<StatusCode> {
-    let mut conn = state.db()?;
+    if !body.is_object() {
+        return Err(AppError::bad_request("request body must be a JSON object"));
+    }
+
+    let parent_class = classify_nullable(body.get("parent_id")).map_err(AppError::bad_request)?;
+    let name_class = classify_nullable(body.get("name")).map_err(AppError::bad_request)?;
 
     conn.transaction::<(), AppError, _>(|conn| {
-        let folder: Folder = folders::table.find(folder_id).first(conn)?;
+        let folder: Folder = folders::table
+            .find(folder_id)
+            .filter(folders::tenant_id.eq(tenant_id))
+            .first(conn)?;
 
         let mut next_parent = folder.parent_id;
         let mut parent_changed = false;
-
+        match parent_class {
-        if let Some(parent_request) = payload.parent_id {
+            NullableValue::Omitted => {}
-            if parent_request == Some(folder_id) {
+            NullableValue::Null => {
+                if folder.parent_id.is_some() {
+                    parent_changed = true;
+                }
+                next_parent = None;
+            }
+            NullableValue::String(value) => {
+                let trimmed = value.trim();
+                if trimmed.is_empty() {
+                    return Err(AppError::bad_request("parent_id must not be empty"));
+                }
+                let parent_id = Uuid::parse_str(trimmed)
+                    .map_err(|_| AppError::bad_request("parent_id must be a valid UUID or null"))?;
+                if parent_id == folder_id {
                     return Err(AppError::bad_request("folder cannot be its own parent"));
                 }
 
-            if let Some(parent_id) = parent_request {
+                let _parent: Folder = folders::table
-                let _parent: Folder = folders::table.find(parent_id).first(conn)?;
+                    .find(parent_id)
+                    .filter(folders::tenant_id.eq(tenant_id))
+                    .first(conn)?;
 
-                let descendant_ids = gather_descendant_folder_ids(conn, folder_id)?;
+                if folder.parent_id != Some(parent_id) {
+                    let descendant_ids = gather_descendant_folder_ids(conn, tenant_id, folder_id)?;
                     if descendant_ids.contains(&parent_id) {
                         return Err(AppError::bad_request(
                             "cannot move folder into itself or a descendant",
                         ));
                     }
+                    parent_changed = true;
                 }
 
-            parent_changed = parent_request != folder.parent_id;
+                next_parent = Some(parent_id);
-            next_parent = parent_request;
+            }
         }
 
         let mut new_name = folder.name.clone();
         let mut name_changed = false;
-
+        match name_class {
-        if let Some(name) = payload.name {
+            NullableValue::Omitted => {}
-            let trimmed = name.trim();
+            NullableValue::Null => {
+                return Err(AppError::bad_request("name cannot be null"));
+            }
+            NullableValue::String(value) => {
+                let trimmed = value.trim();
                 if trimmed.is_empty() {
                     return Err(AppError::bad_request("name must not be empty"));
                 }
@@ -331,6 +473,7 @@ pub async fn update_folder(
                     name_changed = true;
                 }
             }
+        }
 
         if !parent_changed && !name_changed {
             return Ok(());
@@ -341,6 +484,7 @@ pub async fn update_folder(
                 .filter(folders::parent_id.eq(Some(parent_id)))
                 .filter(folders::name.eq(&new_name))
                 .filter(folders::id.ne(folder_id))
+                .filter(folders::tenant_id.eq(tenant_id))
                 .first::<Folder>(conn)
                 .optional()?
         } else {
@@ -348,6 +492,7 @@ pub async fn update_folder(
                 .filter(folders::parent_id.is_null())
                 .filter(folders::name.eq(&new_name))
                 .filter(folders::id.ne(folder_id))
+                .filter(folders::tenant_id.eq(tenant_id))
                 .first::<Folder>(conn)
                 .optional()?
         };
@@ -358,7 +503,11 @@ pub async fn update_folder(
             ));
         }
 
-        diesel::update(folders::table.find(folder_id))
+        diesel::update(
+            folders::table
+                .find(folder_id)
+                .filter(folders::tenant_id.eq(tenant_id)),
+        )
         .set((
             folders::parent_id.eq(next_parent),
             folders::name.eq(&new_name),
@@ -383,6 +532,7 @@ fn folder_to_info(folder: Folder) -> FolderInfo {
 
 pub(super) fn gather_descendant_folder_ids(
     conn: &mut PgConnection,
+    tenant_id: Uuid,
     folder_id: Uuid,
 ) -> AppResult<Vec<Uuid>> {
     let mut ids = vec![folder_id];
@@ -391,6 +541,7 @@ pub(super) fn gather_descendant_folder_ids(
     while let Some(current) = queue.pop() {
         let child_ids: Vec<Uuid> = folders::table
             .filter(folders::parent_id.eq(Some(current)))
+            .filter(folders::tenant_id.eq(tenant_id))
             .select(folders::id)
             .load(conn)?;
         queue.extend(child_ids.iter().copied());

backend/src/routes/mod.rs

@@ -2,18 +2,25 @@ use axum::http::HeaderValue;
 use axum::{
     extract::DefaultBodyLimit,
     middleware,
+    response::Json,
     routing::{delete, get, patch, post},
     Router,
 };
-use tower_http::cors::{AllowOrigin, CorsLayer};
+use std::sync::Arc;
+use tower_http::{
+    cors::{AllowOrigin, CorsLayer},
+    trace::{DefaultMakeSpan, DefaultOnFailure, DefaultOnResponse, TraceLayer},
+};
+use utoipa::OpenApi;
 
-use crate::{auth::AuthenticatedUser, state::AppState};
+use crate::{auth::AuthenticatedUser, openapi::ApiDoc, state::AppState};
 
 pub mod auth;
 pub mod correspondents;
 pub mod documents;
 pub mod folders;
 pub mod health;
+pub mod profile;
 pub mod tags;
 pub mod webdav;
 
@@ -50,14 +57,16 @@ pub fn create_router(state: AppState) -> Router<()> {
         .route("/login", post(auth::login))
         .route("/refresh", post(auth::refresh))
         .route("/logout", post(auth::logout))
+        .route("/select-tenant", post(auth::select_tenant))
+        .route("/tenants", get(auth::list_tenants))
         .route("/me", get(auth::me));
 
     let documents_routes = Router::new()
+        .route("/check", get(documents::check_document))
         .route(
             "/",
             get(documents::list_documents).post(documents::upload_document),
         )
-        .route("/reanalyze", post(documents::reanalyze_all_documents))
         .route("/bulk/move", post(documents::bulk_move_documents))
         .route("/bulk/tags", post(documents::bulk_update_tags))
         .route(
@@ -74,13 +83,17 @@ pub fn create_router(state: AppState) -> Router<()> {
                 .delete(documents::delete_document)
                 .patch(documents::update_document),
         )
-        .route("/:id/download", get(documents::download_document))
-        .route("/:id/assets/:asset_id", get(documents::get_document_asset))
         .route(
             "/:id/assets",
             get(documents::list_document_assets).post(documents::request_document_assets),
         )
         .route("/:id/folder", patch(documents::move_document))
+        .route("/:id/versions", get(documents::list_document_versions))
+        .route(
+            "/:id/versions/:version_id",
+            get(documents::get_document_version),
+        )
+        .route("/:id/restore", post(documents::restore_document))
         .route("/:id/tags", post(documents::assign_tags))
         .route("/:id/tags/:tag_id", delete(documents::remove_tag))
         .route(
@@ -98,10 +111,9 @@ pub fn create_router(state: AppState) -> Router<()> {
     let folders_routes = Router::new()
         .route("/", post(folders::create_folder))
         .route("/path", post(folders::ensure_folder_path))
-        .route(
+        .route("/:id", get(folders::get_folder))
-            "/:id",
+        .route("/:id", delete(folders::delete_folder))
-            delete(folders::delete_folder).patch(folders::update_folder),
+        .route("/:id", patch(folders::update_folder))
-        )
         .route("/:id/contents", get(folders::list_folder_contents));
 
     let tags_routes = Router::new()
@@ -119,20 +131,50 @@ pub fn create_router(state: AppState) -> Router<()> {
                 .delete(correspondents::delete_correspondent),
         );
 
+    let profile_routes = Router::new()
+        .route(
+            "/webdav-tokens",
+            get(profile::list_webdav_tokens).post(profile::create_webdav_token),
+        )
+        .route("/webdav-tokens/:id", delete(profile::delete_webdav_token));
+
     let protected_state = state.clone();
+    let assets_routes = Router::new().route("/:asset_id", get(documents::get_document_asset));
+
     let protected_routes = Router::new()
         .nest("/api/documents", documents_routes)
         .nest("/api/folders", folders_routes)
         .nest("/api/tags", tags_routes)
         .nest("/api/correspondents", correspondents_routes)
+        .nest("/api/profile", profile_routes)
+        .nest("/api/assets", assets_routes)
         .layer(middleware::from_extractor_with_state::<AuthenticatedUser, _>(protected_state));
 
+    let openapi_arc = Arc::new(ApiDoc::openapi());
+    let docs_route = Router::new().route(
+        "/api/docs/openapi.json",
+        get({
+            let spec = openapi_arc.clone();
+            move || {
+                let spec = spec.clone();
+                async move { Json((*spec).clone()) }
+            }
+        }),
+    );
+
     Router::new()
         .merge(download_routes)
         .merge(protected_routes)
+        .merge(docs_route)
         .nest("/api/auth", auth_routes)
         .route("/api/health", get(health::health_check))
         .with_state(state)
         .layer(cors)
         .layer(DefaultBodyLimit::max(1024 * 1024 * 512))
+        .layer(
+            TraceLayer::new_for_http()
+                .make_span_with(DefaultMakeSpan::new().level(tracing::Level::INFO))
+                .on_response(DefaultOnResponse::new().level(tracing::Level::INFO))
+                .on_failure(DefaultOnFailure::new().level(tracing::Level::ERROR)),
+        )
 }

backend/src/routes/profile.rs

@@ -0,0 +1,109 @@
+use axum::{extract::Path, http::StatusCode, Json};
+use chrono::{DateTime, NaiveDateTime};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use crate::auth::{
+    webdav_tokens::{
+        create_webdav_token as issue_token, list_webdav_tokens as load_tokens,
+        revoke_webdav_token as revoke_token,
+    },
+    TenantScopedConn,
+};
+use crate::error::{AppError, AppResult};
+use crate::models::WebdavToken;
+use crate::utils::{db::no_content, time::to_iso};
+
+#[derive(Debug, Serialize)]
+pub struct WebdavTokenResponse {
+    pub id: Uuid,
+    pub tenant_id: Uuid,
+    pub label: Option<String>,
+    pub created_at: String,
+    pub last_used_at: Option<String>,
+    pub expires_at: Option<String>,
+    pub revoked_at: Option<String>,
+}
+
+#[derive(Debug, Serialize)]
+pub struct WebdavTokenCreatedResponse {
+    pub token: String,
+    pub token_info: WebdavTokenResponse,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct CreateWebdavTokenRequest {
+    pub label: Option<String>,
+    pub expires_at: Option<String>,
+}
+
+pub async fn list_webdav_tokens(
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        user_id,
+        ..
+    }: TenantScopedConn,
+) -> AppResult<Json<Vec<WebdavTokenResponse>>> {
+    let tokens = load_tokens(&mut conn, user_id, Some(tenant_id))?;
+    let responses = tokens.into_iter().map(webdav_token_to_response).collect();
+    Ok(Json(responses))
+}
+
+pub async fn create_webdav_token(
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        user_id,
+        ..
+    }: TenantScopedConn,
+    Json(payload): Json<CreateWebdavTokenRequest>,
+) -> AppResult<(StatusCode, Json<WebdavTokenCreatedResponse>)> {
+    let expires_at = match payload.expires_at {
+        Some(ref value) => Some(parse_timestamp(value)?),
+        None => None,
+    };
+
+    let issued = issue_token(
+        &mut conn,
+        user_id,
+        tenant_id,
+        payload.label.clone(),
+        expires_at,
+    )?;
+
+    let response = WebdavTokenCreatedResponse {
+        token: issued.token,
+        token_info: webdav_token_to_response(issued.record),
+    };
+
+    Ok((StatusCode::CREATED, Json(response)))
+}
+
+pub async fn delete_webdav_token(
+    TenantScopedConn {
+        mut conn, user_id, ..
+    }: TenantScopedConn,
+    Path(token_id): Path<Uuid>,
+) -> AppResult<StatusCode> {
+    revoke_token(&mut conn, token_id, user_id)?;
+    no_content()
+}
+
+fn webdav_token_to_response(token: WebdavToken) -> WebdavTokenResponse {
+    WebdavTokenResponse {
+        id: token.id,
+        tenant_id: token.tenant_id,
+        label: token.label,
+        created_at: to_iso(token.created_at),
+        last_used_at: token.last_used_at.map(to_iso),
+        expires_at: token.expires_at.map(to_iso),
+        revoked_at: token.revoked_at.map(to_iso),
+    }
+}
+
+fn parse_timestamp(value: &str) -> AppResult<NaiveDateTime> {
+    let dt = DateTime::parse_from_rfc3339(value)
+        .map_err(|_| AppError::bad_request("invalid expires_at timestamp"))?;
+    Ok(dt.naive_utc())
+}

backend/src/routes/tags.rs

@@ -1,19 +1,16 @@
 use crate::utils::json::{classify_nullable, NullableValue};
-use axum::{
+use axum::{extract::Path, http::StatusCode, Json};
-    extract::{Path, State},
-    http::StatusCode,
-    Json,
-};
 use diesel::{dsl::count_star, prelude::*};
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
 use std::collections::HashMap;
 use uuid::Uuid;
 
+use crate::auth::TenantScopedConn;
 use crate::error::{AppError, AppResult};
 use crate::models::{NewTag, Tag};
 use crate::schema::{document_tags, tags};
-use crate::state::AppState;
+use crate::utils::db::{no_content, EnsureEntity, IntoJsonResponse};
 
 #[derive(Deserialize)]
 pub struct CreateTagRequest {
@@ -36,19 +33,27 @@ pub struct TagCatalogEntry {
     pub usage_count: i64,
 }
 
-pub async fn list_tags(State(state): State<AppState>) -> AppResult<Json<Vec<TagCatalogEntry>>> {
+pub async fn list_tags(
-    let mut conn = state.db()?;
+    TenantScopedConn {
-
+        mut conn,
-    let tag_list: Vec<Tag> = tags::table.order(tags::label.asc()).load(&mut conn)?;
+        tenant_id,
+        ..
+    }: TenantScopedConn,
+) -> AppResult<Json<Vec<TagCatalogEntry>>> {
+    let tag_list: Vec<Tag> = tags::table
+        .filter(tags::tenant_id.eq(tenant_id))
+        .order(tags::label.asc())
+        .load(&mut conn)?;
 
     let usage_rows: Vec<(Uuid, i64)> = document_tags::table
+        .filter(document_tags::tenant_id.eq(tenant_id))
         .group_by(document_tags::tag_id)
         .select((document_tags::tag_id, count_star()))
         .load(&mut conn)?;
 
     let usage_map: HashMap<Uuid, i64> = usage_rows.into_iter().collect();
 
-    let response = tag_list
+    let response: Vec<TagCatalogEntry> = tag_list
         .into_iter()
         .map(|tag| TagCatalogEntry {
             id: tag.id,
@@ -58,22 +63,26 @@ pub async fn list_tags(State(state): State<AppState>) -> AppResult<Json<Vec<TagC
         })
         .collect();
 
-    Ok(Json(response))
+    response.into_json()
 }
 
 pub async fn create_tag(
-    State(state): State<AppState>,
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        ..
+    }: TenantScopedConn,
     Json(payload): Json<CreateTagRequest>,
 ) -> AppResult<Json<TagCatalogEntry>> {
     if payload.label.trim().is_empty() {
         return Err(AppError::bad_request("label must not be empty"));
     }
 
-    let mut conn = state.db()?;
     let new_tag = NewTag {
         id: Uuid::new_v4(),
         label: payload.label.trim().to_string(),
         color: payload.color,
+        tenant_id,
     };
 
     match diesel::insert_into(tags::table)
@@ -90,22 +99,35 @@ pub async fn create_tag(
         Err(err) => return Err(AppError::from(err)),
     }
 
-    let tag: Tag = tags::table.find(new_tag.id).first(&mut conn)?;
+    let tag: Tag = tags::table
-    Ok(Json(TagCatalogEntry {
+        .find(new_tag.id)
+        .filter(tags::tenant_id.eq(tenant_id))
+        .first(&mut conn)
+        .one()?;
+
+    TagCatalogEntry {
         id: tag.id,
         label: tag.label,
         color: tag.color,
         usage_count: 0,
-    }))
+    }
+    .into_json()
 }
 
 pub async fn update_tag(
-    State(state): State<AppState>,
     Path(tag_id): Path<Uuid>,
+    TenantScopedConn {
+        mut conn,
+        tenant_id,
+        ..
+    }: TenantScopedConn,
     Json(body): Json<Value>,
 ) -> AppResult<Json<TagCatalogEntry>> {
-    let mut conn = state.db()?;
+    let existing: Tag = tags::table
-    let existing: Tag = tags::table.find(tag_id).first(&mut conn)?;
+        .find(tag_id)
+        .filter(tags::tenant_id.eq(tenant_id))
+        .first(&mut conn)
+        .one()?;
     let label_class = classify_nullable(body.get("label")).map_err(AppError::bad_request)?;
     let color_class = classify_nullable(body.get("color")).map_err(AppError::bad_request)?;
 
@@ -116,12 +138,13 @@ pub async fn update_tag(
             .filter(document_tags::tag_id.eq(tag_id))
             .select(count_star())
             .first(&mut conn)?;
-        return Ok(Json(TagCatalogEntry {
+        return TagCatalogEntry {
             id: existing.id,
             label: existing.label.clone(),
             color: existing.color.clone(),
             usage_count,
-        }));
+        }
+        .into_json();
     }
 
     let mut new_label: Option<String> = None;
@@ -140,6 +163,7 @@ pub async fn update_tag(
                 let duplicate = tags::table
                     .filter(tags::label.eq(trimmed))
                     .filter(tags::id.ne(tag_id))
+                    .filter(tags::tenant_id.eq(tenant_id))
                     .first::<Tag>(&mut conn)
                     .optional()?;
                 if duplicate.is_some() {
@@ -174,6 +198,7 @@ pub async fn update_tag(
     if !label_changed && !color_changed {
         let usage_count: i64 = document_tags::table
             .filter(document_tags::tag_id.eq(tag_id))
+            .filter(document_tags::tenant_id.eq(tenant_id))
             .select(count_star())
             .first(&mut conn)?;
         return Ok(Json(TagCatalogEntry {
@@ -191,32 +216,45 @@ pub async fn update_tag(
             .map(|opt| opt.as_ref().map(|value| value.as_str())),
     };
 
-    diesel::update(tags::table.find(tag_id))
+    diesel::update(
+        tags::table
+            .find(tag_id)
+            .filter(tags::tenant_id.eq(tenant_id)),
+    )
     .set(&changeset)
     .execute(&mut conn)?;
 
-    let updated: Tag = tags::table.find(tag_id).first(&mut conn)?;
+    let updated: Tag = tags::table
+        .find(tag_id)
+        .filter(tags::tenant_id.eq(tenant_id))
+        .first(&mut conn)
+        .one()?;
     let usage_count: i64 = document_tags::table
         .filter(document_tags::tag_id.eq(tag_id))
+        .filter(document_tags::tenant_id.eq(tenant_id))
         .select(count_star())
         .first(&mut conn)?;
 
-    Ok(Json(TagCatalogEntry {
+    TagCatalogEntry {
         id: updated.id,
         label: updated.label,
         color: updated.color,
         usage_count,
-    }))
+    }
+    .into_json()
 }
 
 pub async fn delete_tag(
-    State(state): State<AppState>,
     Path(tag_id): Path<Uuid>,
-) -> AppResult<impl axum::response::IntoResponse> {
+    TenantScopedConn {
-    let mut conn = state.db()?;
+        mut conn,
-
+        tenant_id,
+        ..
+    }: TenantScopedConn,
+) -> AppResult<StatusCode> {
     let usage: i64 = document_tags::table
         .filter(document_tags::tag_id.eq(tag_id))
+        .filter(document_tags::tenant_id.eq(tenant_id))
         .select(count_star())
         .first(&mut conn)?;
 
@@ -226,10 +264,15 @@ pub async fn delete_tag(
         ));
     }
 
-    let deleted = diesel::delete(tags::table.find(tag_id)).execute(&mut conn)?;
+    let deleted = diesel::delete(
+        tags::table
+            .find(tag_id)
+            .filter(tags::tenant_id.eq(tenant_id)),
+    )
+    .execute(&mut conn)?;
     if deleted == 0 {
         return Err(AppError::not_found());
     }
 
-    Ok(StatusCode::NO_CONTENT)
+    no_content()
 }

backend/src/routes/webdav/mod.rs

@@ -8,6 +8,7 @@ use axum::Router;
 use base64::engine::general_purpose::STANDARD as BASE64;
 use base64::Engine;
 use diesel::prelude::*;
+use diesel::OptionalExtension;
 use diesel::PgConnection;
 use futures_util::StreamExt;
 use percent_encoding::{percent_decode_str, utf8_percent_encode, NON_ALPHANUMERIC};
@@ -15,20 +16,23 @@ use quick_xml::events::{BytesDecl, BytesEnd, BytesStart, BytesText, Event};
 use quick_xml::Writer;
 use uuid::Uuid;
 
-use crate::auth::password;
+use crate::auth::webdav_tokens::{find_active_token_by_secret, touch_webdav_token};
 use crate::error::{AppError, AppResult};
 use crate::models::{Document, DocumentVersion, Folder, User};
 use crate::schema::{
     document_versions::dsl as document_versions_dsl, documents::dsl as documents_dsl,
-    folders::dsl as folders_dsl, users::dsl as users_dsl,
+    folders::dsl as folders_dsl, tenants::dsl as tenant_dsl,
+    user_memberships::dsl as memberships_dsl, users::dsl as users_dsl,
 };
 use crate::state::AppState;
+use crate::utils::{http::inline_content_disposition, time::to_http_date};
 
 const REALM: &str = "Papercrate WebDAV";
 const DOWNLOAD_URL_TTL_SECONDS: u64 = 300;
 
 #[derive(Clone, Debug)]
-struct WebDavUser {
+struct WebDavContext {
+    tenant_id: Uuid,
     _user_id: Uuid,
     _username: String,
 }
@@ -68,7 +72,7 @@ async fn handle_propfind(
     path: &str,
     headers: HeaderMap,
 ) -> Result<Response, AppError> {
-    let _user = match authenticate(state, &headers)? {
+    let context = match authenticate(state, &headers)? {
         Some(user) => user,
         None => return Ok(unauthorized_response()),
     };
@@ -79,18 +83,21 @@ async fn handle_propfind(
     };
 
     let segments = parse_segments(path)?;
-    let resolution = match resolve_path(state, &segments)? {
+
+    let tenant_id = context.tenant_id;
+
+    let resources = if segments.is_empty() {
+        let contents = fetch_folder_contents(state, tenant_id, None)?;
+        build_resources_for_folder(None, &[], &contents, depth)
+    } else {
+        let resolution = match resolve_path(state, tenant_id, &segments)? {
             Some(resolved) => resolved,
             None => return Ok(not_found_response()),
         };
 
-    let resources = match resolution {
+        match resolution {
-        ResolvedPath::Root => {
-            let contents = fetch_folder_contents(state, None)?;
-            build_resources_for_folder(None, &[], &contents, depth)
-        }
             ResolvedPath::Folder { folder, chain } => {
-            let contents = fetch_folder_contents(state, Some(folder.id))?;
+                let contents = fetch_folder_contents(state, tenant_id, Some(folder.id))?;
                 build_resources_for_folder(Some(&folder), &chain, &contents, depth)
             }
             ResolvedPath::Document {
@@ -98,6 +105,7 @@ async fn handle_propfind(
                 version,
                 chain,
             } => build_resources_for_document(&chain, &document, &version),
+        }
     };
 
     let body = render_multistatus(&resources)
@@ -118,13 +126,18 @@ async fn handle_get_or_head(
     headers: HeaderMap,
     method: Method,
 ) -> Result<Response, AppError> {
-    let _user = match authenticate(state, &headers)? {
+    let context = match authenticate(state, &headers)? {
         Some(user) => user,
         None => return Ok(unauthorized_response()),
     };
 
+    let tenant_id = context.tenant_id;
     let segments = parse_segments(path)?;
-    let resolution = match resolve_path(state, &segments)? {
+    if segments.is_empty() {
+        return Ok(method_not_allowed());
+    }
+
+    let resolution = match resolve_path(state, tenant_id, &segments)? {
         Some(resolved) => resolved,
         None => return Ok(not_found_response()),
     };
@@ -219,21 +232,29 @@ fn parse_segments(path: &str) -> AppResult<Vec<String>> {
 
 fn fetch_folder_contents(
     state: &AppState,
+    tenant_id: Uuid,
     folder_id: Option<Uuid>,
 ) -> AppResult<WebDavFolderContents> {
-    let mut conn = state.db()?;
+    let mut conn = state.db_for_tenant(tenant_id)?;
 
     let folder = match folder_id {
-        Some(id) => Some(folders_dsl::folders.find(id).first::<Folder>(&mut conn)?),
+        Some(id) => Some(
+            folders_dsl::folders
+                .filter(folders_dsl::tenant_id.eq(tenant_id))
+                .find(id)
+                .first::<Folder>(&mut conn)?,
+        ),
         None => None,
     };
 
     let subfolders: Vec<Folder> = match folder_id {
         Some(id) => folders_dsl::folders
+            .filter(folders_dsl::tenant_id.eq(tenant_id))
             .filter(folders_dsl::parent_id.eq(Some(id)))
             .order(folders_dsl::name.asc())
             .load(&mut conn)?,
         None => folders_dsl::folders
+            .filter(folders_dsl::tenant_id.eq(tenant_id))
             .filter(folders_dsl::parent_id.is_null())
             .order(folders_dsl::name.asc())
             .load(&mut conn)?,
@@ -241,6 +262,7 @@ fn fetch_folder_contents(
 
     let mut docs_query = documents_dsl::documents
         .filter(documents_dsl::deleted_at.is_null())
+        .filter(documents_dsl::tenant_id.eq(tenant_id))
         .into_boxed();
 
     docs_query = match folder_id {
@@ -290,8 +312,9 @@ async fn stream_document(
 ) -> Result<Response, AppError> {
     let range_header = headers.get(header::RANGE).cloned();
 
-    let url = state
+    let storage = state.storage_for_tenant(document.tenant_id)?;
-        .storage
+
+    let url = storage
         .presign_get_object(
             &version.s3_key,
             Duration::from_secs(DOWNLOAD_URL_TTL_SECONDS),
@@ -338,7 +361,7 @@ async fn stream_document(
 
     builder = builder.header("Accept-Ranges", "bytes");
 
-    if let Some(disposition) = content_disposition(&document.filename) {
+    if let Some(disposition) = inline_content_disposition(&document.filename) {
         builder = builder.header(header::CONTENT_DISPOSITION, disposition);
     }
 
@@ -360,7 +383,7 @@ async fn stream_document(
         .map_err(|err| AppError::internal(format!("failed to build response: {err}")))
 }
 
-fn authenticate(state: &AppState, headers: &HeaderMap) -> Result<Option<WebDavUser>, AppError> {
+fn authenticate(state: &AppState, headers: &HeaderMap) -> Result<Option<WebDavContext>, AppError> {
     tracing::debug!("webdav authenticate invoked");
     let authorization = match headers.get(header::AUTHORIZATION) {
         Some(value) => match value.to_str() {
@@ -399,13 +422,13 @@ fn authenticate(state: &AppState, headers: &HeaderMap) -> Result<Option<WebDavUs
         }
     };
 
-    let (username, password) = match credential_str.split_once(':') {
+    let (username, secret) = match credential_str.split_once(':') {
-        Some((username, password)) if !username.is_empty() => (username, password),
+        Some((username, secret)) if !username.is_empty() => (username, secret),
         _ => return Ok(None),
     };
 
     tracing::debug!(%username, "attempting webdav login");
-    let mut conn = state.db()?;
+    let mut conn = state.db_unscoped()?;
 
     let user: User = match users_dsl::users
         .filter(users_dsl::username.eq(username))
@@ -419,16 +442,44 @@ fn authenticate(state: &AppState, headers: &HeaderMap) -> Result<Option<WebDavUs
         Err(err) => return Err(AppError::from(err)),
     };
 
-    let valid = password::verify_password(password, &user.password_hash)
+    let token = match find_active_token_by_secret(&mut conn, user.id, None, secret)? {
-        .map_err(|_| AppError::internal("failed to verify password"))?;
+        Some(token) => token,
-
+        None => {
-    if !valid {
+            tracing::warn!(%username, "webdav token invalid or expired");
-        tracing::warn!(%username, "webdav password invalid");
             return Ok(None);
         }
+    };
 
-    tracing::debug!(%username, "webdav login success");
+    let tenant_row = memberships_dsl::user_memberships
-    Ok(Some(WebDavUser {
+        .inner_join(tenant_dsl::tenants)
+        .filter(memberships_dsl::user_id.eq(user.id))
+        .filter(memberships_dsl::tenant_id.eq(token.tenant_id))
+        .select((tenant_dsl::id, tenant_dsl::slug))
+        .first::<(Uuid, String)>(&mut conn)
+        .optional()?;
+
+    let (tenant_id, _slug) = match tenant_row {
+        Some(row) => row,
+        None => {
+            tracing::warn!(
+                %username,
+                tenant_id = %token.tenant_id,
+                "webdav token tenant membership missing"
+            );
+            return Ok(None);
+        }
+    };
+
+    touch_webdav_token(&mut conn, token.id)?;
+
+    tracing::debug!(
+        %username,
+        tenant_id = %tenant_id,
+        token_id = %token.id,
+        "webdav token login success"
+    );
+    Ok(Some(WebDavContext {
+        tenant_id,
         _user_id: user.id,
         _username: user.username,
     }))
@@ -444,10 +495,10 @@ fn build_resources_for_folder(
 
     let display_name = folder
         .map(|folder| folder.name.clone())
-        .unwrap_or_else(|| "/".to_string());
+        .unwrap_or_else(|| chain.last().cloned().unwrap_or_else(|| "/".to_string()));
 
     let href = build_href(chain, true);
-    let last_modified = folder.map(|folder| format_http_date(folder.updated_at));
+    let last_modified = folder.map(|folder| to_http_date(folder.updated_at));
 
     resources.push(DavResource {
         href,
@@ -471,7 +522,7 @@ fn build_resources_for_folder(
             is_collection: true,
             content_length: None,
             content_type: None,
-            last_modified: Some(format_http_date(subfolder.updated_at)),
+            last_modified: Some(to_http_date(subfolder.updated_at)),
         });
     }
 
@@ -509,7 +560,7 @@ fn document_to_resource(
         is_collection: false,
         content_length: Some(version.size_bytes),
         content_type: document.content_type.clone(),
-        last_modified: Some(format_http_date(document.updated_at)),
+        last_modified: Some(to_http_date(document.updated_at)),
     }
 }
 
@@ -590,32 +641,6 @@ fn render_multistatus(resources: &[DavResource]) -> Result<Vec<u8>, quick_xml::E
     Ok(writer.into_inner())
 }
 
-fn format_http_date(value: chrono::NaiveDateTime) -> String {
-    let datetime = chrono::DateTime::<chrono::Utc>::from_naive_utc_and_offset(value, chrono::Utc);
-    datetime.format("%a, %d %b %Y %H:%M:%S GMT").to_string()
-}
-
-fn content_disposition(filename: &str) -> Option<String> {
-    if filename.is_empty() {
-        return None;
-    }
-
-    let sanitized: String = filename
-        .chars()
-        .map(|ch| match ch {
-            '"' | '\\' => '_',
-            _ => ch,
-        })
-        .collect();
-
-    let encoded =
-        percent_encoding::utf8_percent_encode(&sanitized, percent_encoding::NON_ALPHANUMERIC);
-    Some(format!(
-        "inline; filename=\"{}\"; filename*=UTF-8''{}",
-        sanitized, encoded
-    ))
-}
-
 struct WebDavFolderContents {
     _folder: Option<Folder>,
     subfolders: Vec<Folder>,
@@ -635,9 +660,7 @@ struct DavResource {
     content_type: Option<String>,
     last_modified: Option<String>,
 }
-
 enum ResolvedPath {
-    Root,
     Folder {
         folder: Folder,
         chain: Vec<String>,
@@ -649,12 +672,12 @@ enum ResolvedPath {
     },
 }
 
-fn resolve_path(state: &AppState, segments: &[String]) -> AppResult<Option<ResolvedPath>> {
+fn resolve_path(
-    if segments.is_empty() {
+    state: &AppState,
-        return Ok(Some(ResolvedPath::Root));
+    tenant_id: Uuid,
-    }
+    segments: &[String],
-
+) -> AppResult<Option<ResolvedPath>> {
-    let mut conn = state.db()?;
+    let mut conn = state.db_for_tenant(tenant_id)?;
     let mut parent_id: Option<Uuid> = None;
     let mut chain: Vec<String> = Vec::new();
     let mut current_folder: Option<Folder> = None;
@@ -662,24 +685,19 @@ fn resolve_path(state: &AppState, segments: &[String]) -> AppResult<Option<Resol
     for (index, segment) in segments.iter().enumerate() {
         let is_last = index == segments.len() - 1;
 
-        match find_folder_by_name(&mut conn, parent_id, segment)? {
+        if let Some(folder) = find_folder_by_name(&mut conn, tenant_id, parent_id, segment)? {
-            Some(folder) => {
-                if is_last {
             chain.push(folder.name.clone());
+            if is_last {
                 return Ok(Some(ResolvedPath::Folder { folder, chain }));
             }
-
             parent_id = Some(folder.id);
-                chain.push(folder.name.clone());
             current_folder = Some(folder);
             continue;
         }
-            None => {}
-        }
 
         if is_last {
             if let Some((document, version)) =
-                find_document_by_filename(&mut conn, parent_id, segment)?
+                find_document_by_filename(&mut conn, tenant_id, parent_id, segment)?
             {
                 chain.push(document.filename.clone());
                 return Ok(Some(ResolvedPath::Document {
@@ -691,26 +709,20 @@ fn resolve_path(state: &AppState, segments: &[String]) -> AppResult<Option<Resol
         }
 
         if let Ok(uuid) = Uuid::parse_str(segment) {
-            if let Some(folder) = folders_dsl::folders
+            if let Some(folder) = find_folder_by_id(&mut conn, tenant_id, uuid)? {
-                .find(uuid)
-                .first::<Folder>(&mut conn)
-                .optional()?
-            {
                 if folder.parent_id != parent_id {
                     return Ok(None);
                 }
-                if !is_last {
-                    parent_id = Some(folder.id);
-                    chain.push(folder.name.clone());
-                    current_folder = Some(folder);
-                    continue;
-                } else {
                 chain.push(folder.name.clone());
+                if is_last {
                     return Ok(Some(ResolvedPath::Folder { folder, chain }));
                 }
+                parent_id = Some(folder.id);
+                current_folder = Some(folder);
+                continue;
             }
 
-            if let Some((document, version)) = find_document_by_id(&mut conn, uuid)? {
+            if let Some((document, version)) = find_document_by_id(&mut conn, tenant_id, uuid)? {
                 if document.folder_id != parent_id {
                     return Ok(None);
                 }
@@ -723,19 +735,6 @@ fn resolve_path(state: &AppState, segments: &[String]) -> AppResult<Option<Resol
             }
         }
 
-        if is_last {
-            if let Some((document, version)) =
-                find_document_by_filename(&mut conn, parent_id, segment)?
-            {
-                chain.push(document.filename.clone());
-                return Ok(Some(ResolvedPath::Document {
-                    document,
-                    version,
-                    chain,
-                }));
-            }
-        }
-
         return Ok(None);
     }
 
@@ -744,32 +743,46 @@ fn resolve_path(state: &AppState, segments: &[String]) -> AppResult<Option<Resol
 
 fn find_folder_by_name(
     conn: &mut PgConnection,
+    tenant_id: Uuid,
     parent_id: Option<Uuid>,
     name: &str,
 ) -> AppResult<Option<Folder>> {
-    let result = match parent_id {
+    let mut query = folders_dsl::folders
-        Some(parent) => folders_dsl::folders
+        .filter(folders_dsl::tenant_id.eq(tenant_id))
-            .filter(folders_dsl::parent_id.eq(Some(parent)))
+        .into_boxed();
-            .filter(folders_dsl::name.eq(name))
+
-            .first::<Folder>(conn)
+    query = match parent_id {
-            .optional()?,
+        Some(parent) => query.filter(folders_dsl::parent_id.eq(Some(parent))),
-        None => folders_dsl::folders
+        None => query.filter(folders_dsl::parent_id.is_null()),
-            .filter(folders_dsl::parent_id.is_null())
-            .filter(folders_dsl::name.eq(name))
-            .first::<Folder>(conn)
-            .optional()?,
     };
 
-    Ok(result)
+    Ok(query
+        .filter(folders_dsl::name.eq(name))
+        .first::<Folder>(conn)
+        .optional()?)
+}
+
+fn find_folder_by_id(
+    conn: &mut PgConnection,
+    tenant_id: Uuid,
+    folder_id: Uuid,
+) -> AppResult<Option<Folder>> {
+    Ok(folders_dsl::folders
+        .filter(folders_dsl::tenant_id.eq(tenant_id))
+        .find(folder_id)
+        .first::<Folder>(conn)
+        .optional()?)
 }
 
 fn find_document_by_filename(
     conn: &mut PgConnection,
+    tenant_id: Uuid,
     parent_id: Option<Uuid>,
     filename: &str,
 ) -> AppResult<Option<(Document, DocumentVersion)>> {
     let mut query = documents_dsl::documents
         .filter(documents_dsl::deleted_at.is_null())
+        .filter(documents_dsl::tenant_id.eq(tenant_id))
         .filter(documents_dsl::filename.eq(filename))
         .into_boxed();
 
@@ -790,10 +803,12 @@ fn find_document_by_filename(
 
 fn find_document_by_id(
     conn: &mut PgConnection,
+    tenant_id: Uuid,
     document_id: Uuid,
 ) -> AppResult<Option<(Document, DocumentVersion)>> {
     if let Some(document) = documents_dsl::documents
         .filter(documents_dsl::deleted_at.is_null())
+        .filter(documents_dsl::tenant_id.eq(tenant_id))
         .find(document_id)
         .first::<Document>(conn)
         .optional()?

backend/src/schema.rs

@@ -8,6 +8,18 @@ diesel::table! {
         metadata -> Jsonb,
         created_at -> Timestamptz,
         updated_at -> Timestamptz,
+        tenant_id -> Uuid,
+    }
+}
+
+diesel::table! {
+    document_asset_objects (id) {
+        id -> Uuid,
+        asset_id -> Uuid,
+        ordinal -> Int4,
+        s3_key -> Text,
+        metadata -> Jsonb,
+        tenant_id -> Uuid,
     }
 }
 
@@ -16,21 +28,21 @@ diesel::table! {
         id -> Uuid,
         document_version_id -> Uuid,
         asset_type -> Text,
-        s3_key -> Text,
         mime_type -> Text,
         metadata -> Jsonb,
         created_at -> Timestamptz,
+        cardinality -> Nullable<Int4>,
+        tenant_id -> Uuid,
     }
 }
 
 diesel::table! {
-    document_correspondents (document_id, correspondent_id, role) {
+    document_correspondents (document_id, correspondent_id) {
         document_id -> Uuid,
         correspondent_id -> Uuid,
-        #[max_length = 32]
-        role -> Varchar,
         assigned_at -> Timestamptz,
         assigned_by -> Nullable<Uuid>,
+        tenant_id -> Uuid,
     }
 }
 
@@ -40,6 +52,7 @@ diesel::table! {
         tag_id -> Uuid,
         assigned_at -> Timestamptz,
         assigned_by -> Nullable<Uuid>,
+        tenant_id -> Uuid,
     }
 }
 
@@ -54,8 +67,8 @@ diesel::table! {
         #[max_length = 64]
         checksum -> Varchar,
         created_at -> Timestamptz,
-        operations_summary -> Jsonb,
         metadata -> Jsonb,
+        tenant_id -> Uuid,
     }
 }
 
@@ -77,6 +90,7 @@ diesel::table! {
         #[max_length = 255]
         title -> Varchar,
         current_version_id -> Uuid,
+        tenant_id -> Uuid,
     }
 }
 
@@ -88,6 +102,7 @@ diesel::table! {
         parent_id -> Nullable<Uuid>,
         created_at -> Timestamptz,
         updated_at -> Timestamptz,
+        tenant_id -> Uuid,
     }
 }
 
@@ -102,6 +117,7 @@ diesel::table! {
         last_error -> Nullable<Text>,
         created_at -> Timestamptz,
         updated_at -> Timestamptz,
+        tenant_id -> Uuid,
     }
 }
 
@@ -115,6 +131,7 @@ diesel::table! {
         revoked_at -> Nullable<Timestamptz>,
         created_at -> Timestamptz,
         updated_at -> Timestamptz,
+        tenant_id -> Uuid,
     }
 }
 
@@ -126,6 +143,31 @@ diesel::table! {
         #[max_length = 7]
         color -> Nullable<Varchar>,
         created_at -> Timestamptz,
+        tenant_id -> Uuid,
+    }
+}
+
+diesel::table! {
+    tenants (id) {
+        id -> Uuid,
+        slug -> Text,
+        storage_root -> Nullable<Text>,
+        quickwit_index -> Nullable<Text>,
+        status -> Text,
+        config -> Jsonb,
+        created_at -> Timestamptz,
+        updated_at -> Timestamptz,
+    }
+}
+
+diesel::table! {
+    user_memberships (id) {
+        id -> Uuid,
+        user_id -> Uuid,
+        tenant_id -> Uuid,
+        role -> Text,
+        created_at -> Timestamptz,
+        updated_at -> Timestamptz,
     }
 }
 
@@ -136,25 +178,55 @@ diesel::table! {
         username -> Varchar,
         #[max_length = 255]
         password_hash -> Varchar,
-        #[max_length = 16]
-        role -> Varchar,
         created_at -> Timestamptz,
         updated_at -> Timestamptz,
     }
 }
 
+diesel::table! {
+    webdav_tokens (id) {
+        id -> Uuid,
+        user_id -> Uuid,
+        tenant_id -> Uuid,
+        token_prefix -> Text,
+        token_hash -> Text,
+        label -> Nullable<Text>,
+        created_at -> Timestamptz,
+        last_used_at -> Nullable<Timestamptz>,
+        expires_at -> Nullable<Timestamptz>,
+        revoked_at -> Nullable<Timestamptz>,
+    }
+}
+
+diesel::joinable!(correspondents -> tenants (tenant_id));
+diesel::joinable!(document_asset_objects -> document_assets (asset_id));
+diesel::joinable!(document_asset_objects -> tenants (tenant_id));
 diesel::joinable!(document_assets -> document_versions (document_version_id));
+diesel::joinable!(document_assets -> tenants (tenant_id));
 diesel::joinable!(document_correspondents -> correspondents (correspondent_id));
 diesel::joinable!(document_correspondents -> documents (document_id));
+diesel::joinable!(document_correspondents -> tenants (tenant_id));
 diesel::joinable!(document_correspondents -> users (assigned_by));
 diesel::joinable!(document_tags -> documents (document_id));
 diesel::joinable!(document_tags -> tags (tag_id));
+diesel::joinable!(document_tags -> tenants (tenant_id));
 diesel::joinable!(document_tags -> users (assigned_by));
+diesel::joinable!(document_versions -> tenants (tenant_id));
 diesel::joinable!(documents -> folders (folder_id));
+diesel::joinable!(documents -> tenants (tenant_id));
+diesel::joinable!(folders -> tenants (tenant_id));
+diesel::joinable!(jobs -> tenants (tenant_id));
+diesel::joinable!(refresh_tokens -> tenants (tenant_id));
 diesel::joinable!(refresh_tokens -> users (user_id));
+diesel::joinable!(tags -> tenants (tenant_id));
+diesel::joinable!(user_memberships -> tenants (tenant_id));
+diesel::joinable!(user_memberships -> users (user_id));
+diesel::joinable!(webdav_tokens -> tenants (tenant_id));
+diesel::joinable!(webdav_tokens -> users (user_id));
 
 diesel::allow_tables_to_appear_in_same_query!(
     correspondents,
+    document_asset_objects,
     document_assets,
     document_correspondents,
     document_tags,
@@ -164,5 +236,8 @@ diesel::allow_tables_to_appear_in_same_query!(
     jobs,
     refresh_tokens,
     tags,
+    tenants,
+    user_memberships,
     users,
+    webdav_tokens,
 );

backend/src/state.rs

@@ -4,43 +4,79 @@ use diesel::{
     pg::PgConnection,
     r2d2::{ConnectionManager, PooledConnection},
 };
+use uuid::Uuid;
 
 use crate::{
     auth::jwt::JwtService,
     config::AppConfig,
     db::PgPool,
     error::{AppError, AppResult},
-    storage::ObjectStorage,
+    storage::{ObjectStorage, TenantStorage},
+    tenants::{apply_tenant_guc, TenantService},
 };
 
-type PgPooledConnection = PooledConnection<ConnectionManager<PgConnection>>;
+pub type PgPooledConnection = PooledConnection<ConnectionManager<PgConnection>>;
 
 #[derive(Clone)]
 pub struct AppState {
     pub pool: PgPool,
     pub config: Arc<AppConfig>,
-    pub storage: Arc<dyn ObjectStorage>,
+    storage: Arc<dyn ObjectStorage>,
     pub jwt: JwtService,
+    pub tenants: TenantService,
 }
 
 impl AppState {
+    pub async fn initialize(
+        config: AppConfig,
+        pool_size_override: Option<u32>,
+    ) -> anyhow::Result<Self> {
+        let pool_size = pool_size_override.unwrap_or(config.database_max_pool_size);
+        let pool = crate::db::init_pool_with_size(&config.database_url, pool_size)?;
+        let s3_client = crate::s3::build_client(&config).await?;
+        let storage = Arc::new(crate::storage::S3Storage::new(
+            s3_client,
+            config.s3_bucket.clone(),
+        ));
+        let jwt = crate::auth::jwt::JwtService::from_config(&config)?;
+
+        Ok(Self::new(pool, config, storage, jwt))
+    }
+
     pub fn new(
         pool: PgPool,
         config: AppConfig,
         storage: Arc<dyn ObjectStorage>,
         jwt: JwtService,
     ) -> Self {
+        let config = Arc::new(config);
+        let tenants = TenantService::new(pool.clone());
+
         Self {
             pool,
-            config: Arc::new(config),
+            config,
             storage,
             jwt,
+            tenants,
         }
     }
 
-    pub fn db(&self) -> AppResult<PgPooledConnection> {
+    pub fn db_for_tenant(&self, tenant_id: Uuid) -> AppResult<PgPooledConnection> {
+        debug_assert!(!tenant_id.is_nil(), "nil tenant_id passed to db_for_tenant");
+        let mut conn = self.db_unscoped()?;
+        apply_tenant_guc(&mut conn, tenant_id)?;
+        Ok(conn)
+    }
+
+    pub(crate) fn db_unscoped(&self) -> AppResult<PgPooledConnection> {
         self.pool
             .get()
             .map_err(|err| AppError::internal(format!("database pool error: {err}")))
     }
+
+    pub fn storage_for_tenant(&self, tenant_id: Uuid) -> AppResult<TenantStorage> {
+        let tenant = self.tenants.get_by_id(tenant_id)?;
+        TenantStorage::new(self.storage.clone(), &tenant)
+            .map_err(|err| AppError::internal(format!("tenant storage error: {err}")))
+    }
 }

backend/src/storage.rs

@@ -1,11 +1,15 @@
 use std::time::Duration;
 
-use anyhow::{Context, Result};
+use std::sync::Arc;
+
+use anyhow::{anyhow, Context, Result};
 use async_trait::async_trait;
 use aws_sdk_s3::presigning::PresigningConfig;
 use aws_sdk_s3::primitives::ByteStream;
 use aws_sdk_s3::Client as S3Client;
 
+use crate::models::Tenant;
+
 #[async_trait]
 pub trait ObjectStorage: Send + Sync + 'static {
     async fn put_object(
@@ -119,3 +123,52 @@ impl ObjectStorage for S3Storage {
         Ok(())
     }
 }
+#[derive(Clone)]
+pub struct TenantStorage {
+    inner: Arc<dyn ObjectStorage>,
+    root: String,
+}
+
+impl TenantStorage {
+    pub fn new(inner: Arc<dyn ObjectStorage>, tenant: &Tenant) -> Result<Self> {
+        let root = tenant
+            .storage_root
+            .as_ref()
+            .ok_or_else(|| anyhow!("tenant {} missing storage_root", tenant.id))?
+            .to_owned();
+
+        Ok(Self { inner, root })
+    }
+
+    fn qualify(&self, key: &str) -> String {
+        format!("{}{}", self.root, key)
+    }
+
+    pub async fn put_object(
+        &self,
+        key: &str,
+        bytes: Vec<u8>,
+        content_type: Option<String>,
+        content_disposition: Option<String>,
+    ) -> Result<()> {
+        let qualified = self.qualify(key);
+        self.inner
+            .put_object(&qualified, bytes, content_type, content_disposition)
+            .await
+    }
+
+    pub async fn presign_get_object(&self, key: &str, expires_in: Duration) -> Result<String> {
+        let qualified = self.qualify(key);
+        self.inner.presign_get_object(&qualified, expires_in).await
+    }
+
+    pub async fn get_object(&self, key: &str) -> Result<Vec<u8>> {
+        let qualified = self.qualify(key);
+        self.inner.get_object(&qualified).await
+    }
+
+    pub async fn delete_object(&self, key: &str) -> Result<()> {
+        let qualified = self.qualify(key);
+        self.inner.delete_object(&qualified).await
+    }
+}

backend/src/tenants.rs

@@ -0,0 +1,91 @@
+use axum::{async_trait, extract::FromRequestParts, http::request::Parts};
+use diesel::{pg::PgConnection, prelude::*, sql_types::Text};
+use uuid::Uuid;
+
+use crate::{
+    db::PgPool,
+    error::{AppError, AppResult},
+    models::Tenant,
+    schema::tenants::dsl,
+    state::AppState,
+};
+
+pub struct TenantRepository;
+
+impl TenantRepository {
+    pub fn get_by_id(conn: &mut PgConnection, tenant_id: Uuid) -> AppResult<Tenant> {
+        dsl::tenants.find(tenant_id).first(conn).map_err(Into::into)
+    }
+
+    pub fn get_by_slug(conn: &mut PgConnection, slug: &str) -> AppResult<Tenant> {
+        dsl::tenants
+            .filter(dsl::slug.eq(slug))
+            .first(conn)
+            .map_err(Into::into)
+    }
+}
+
+#[derive(Clone)]
+pub struct TenantService {
+    pool: PgPool,
+}
+
+impl TenantService {
+    pub fn new(pool: PgPool) -> Self {
+        Self { pool }
+    }
+
+    pub fn get_by_id(&self, tenant_id: Uuid) -> AppResult<Tenant> {
+        let tenant = self.load(|conn| TenantRepository::get_by_id(conn, tenant_id))?;
+        Ok(tenant)
+    }
+
+    pub fn get_by_slug(&self, slug: &str) -> AppResult<Tenant> {
+        let slug_owned = slug.to_owned();
+        let tenant = self.load(|conn| TenantRepository::get_by_slug(conn, &slug_owned))?;
+        Ok(tenant)
+    }
+
+    pub fn tenant_id_for_slug(&self, slug: &str) -> AppResult<Uuid> {
+        Ok(self.get_by_slug(slug)?.id)
+    }
+
+    fn load<F>(&self, loader: F) -> AppResult<Tenant>
+    where
+        F: FnOnce(&mut PgConnection) -> AppResult<Tenant>,
+    {
+        let mut conn = self
+            .pool
+            .get()
+            .map_err(|err| AppError::internal(format!("database pool error: {err}")))?;
+        let tenant = loader(&mut conn)?;
+        Ok(tenant)
+    }
+}
+
+pub fn apply_tenant_guc(conn: &mut PgConnection, tenant_id: Uuid) -> AppResult<()> {
+    diesel::sql_query("SELECT set_config('papercrate.tenant_id', $1, true)")
+        .bind::<Text, _>(tenant_id.to_string())
+        .execute(conn)
+        .map(|_| ())
+        .map_err(AppError::from)
+}
+
+pub struct TenantContext {
+    pub tenant: Tenant,
+}
+
+#[async_trait]
+impl FromRequestParts<AppState> for TenantContext {
+    type Rejection = AppError;
+
+    async fn from_request_parts(
+        _parts: &mut Parts,
+        state: &AppState,
+    ) -> Result<Self, Self::Rejection> {
+        let tenant = state
+            .tenants
+            .get_by_slug(&state.config.default_tenant_slug)?;
+        Ok(Self { tenant })
+    }
+}

backend/src/utils/bootstrap.rs

@@ -0,0 +1,14 @@
+use std::sync::Arc;
+
+use anyhow::Result;
+
+use crate::{config::AppConfig, state::AppState, utils::tracing::init_tracing};
+
+/// Initialize tracing, load configuration, and build the shared `AppState`.
+/// Optionally override the connection pool size for lightweight components.
+pub async fn init_component(name: &str, pool_override: Option<u32>) -> Result<Arc<AppState>> {
+    init_tracing("info");
+    let config = AppConfig::load_and_log(name)?;
+    let state = AppState::initialize(config, pool_override).await?;
+    Ok(Arc::new(state))
+}

backend/src/utils/db.rs

@@ -0,0 +1,59 @@
+use diesel::{pg::PgConnection, result::Error as DieselError};
+use uuid::Uuid;
+
+use crate::{
+    error::{AppError, AppResult},
+    state::AppState,
+};
+
+pub trait EnsureEntity<T> {
+    fn one(self) -> AppResult<T>;
+    fn maybe(self) -> AppResult<Option<T>>;
+}
+
+impl<T> EnsureEntity<T> for Result<T, DieselError> {
+    fn one(self) -> AppResult<T> {
+        self.map_err(AppError::from)
+    }
+
+    fn maybe(self) -> AppResult<Option<T>> {
+        match self {
+            Ok(value) => Ok(Some(value)),
+            Err(DieselError::NotFound) => Ok(None),
+            Err(err) => Err(AppError::from(err)),
+        }
+    }
+}
+
+impl AppState {
+    pub fn with_tenant_conn<F, T>(&self, tenant_id: Uuid, f: F) -> AppResult<T>
+    where
+        F: FnOnce(&mut PgConnection) -> AppResult<T>,
+    {
+        let mut conn = self.db_for_tenant(tenant_id)?;
+        f(&mut conn)
+    }
+}
+
+pub fn validate_bulk_ids(ids: &mut Vec<Uuid>, label: &str) -> AppResult<()> {
+    if ids.is_empty() {
+        return Err(AppError::bad_request(format!("{label} must not be empty")));
+    }
+    ids.sort_unstable();
+    ids.dedup();
+    Ok(())
+}
+
+pub trait IntoJsonResponse<T> {
+    fn into_json(self) -> AppResult<axum::Json<T>>;
+}
+
+impl<T> IntoJsonResponse<T> for T {
+    fn into_json(self) -> AppResult<axum::Json<T>> {
+        Ok(axum::Json(self))
+    }
+}
+
+pub fn no_content() -> AppResult<axum::http::StatusCode> {
+    Ok(axum::http::StatusCode::NO_CONTENT)
+}

backend/src/utils/http.rs

@@ -0,0 +1,22 @@
+use percent_encoding::{utf8_percent_encode, NON_ALPHANUMERIC};
+
+/// Build an inline `Content-Disposition` header value for a given filename.
+pub fn inline_content_disposition(filename: &str) -> Option<String> {
+    if filename.is_empty() {
+        return None;
+    }
+
+    let sanitized: String = filename
+        .chars()
+        .map(|ch| match ch {
+            '"' | '\\' => '_',
+            _ => ch,
+        })
+        .collect();
+    let encoded = utf8_percent_encode(&sanitized, NON_ALPHANUMERIC);
+
+    Some(format!(
+        "inline; filename=\"{}\"; filename*=UTF-8''{}",
+        sanitized, encoded
+    ))
+}

backend/src/utils/mod.rs

@@ -1 +1,8 @@
+pub mod bootstrap;
+pub mod db;
+pub mod http;
 pub mod json;
+pub mod storage_paths;
+pub mod time;
+pub mod tracing;
+pub mod validation;

backend/src/utils/storage_paths.rs

@@ -0,0 +1,115 @@
+//! Document storage path helpers.
+//!
+//! NOTE: The path layout produced here is part of the durable storage contract.
+//! External systems (presigned URLs, lifecycle jobs, migrations) expect the
+//! `documents/{document_id}/...` structure to remain stable. Coordinate before
+//! changing any of these helpers to avoid breaking compatibility with existing
+//! objects.
+
+use uuid::Uuid;
+
+const DOCUMENTS_PREFIX: &str = "documents";
+
+/// Returns the root prefix for all objects belonging to a document.
+pub fn document_prefix(document_id: Uuid) -> String {
+    format!("{DOCUMENTS_PREFIX}/{document_id}")
+}
+
+/// Returns the prefix for a specific document version (without the object id).
+pub fn document_version_prefix(document_id: Uuid, version_number: i32) -> String {
+    format!("{}/v{}", document_prefix(document_id), version_number)
+}
+
+/// Returns the storage key for a stored document version blob.
+pub fn document_version_object_key(
+    document_id: Uuid,
+    version_number: i32,
+    version_id: Uuid,
+) -> String {
+    format!(
+        "{}/{}",
+        document_version_prefix(document_id, version_number),
+        version_id
+    )
+}
+
+fn document_asset_prefix(document_id: Uuid, version_number: i32) -> String {
+    format!(
+        "{}/assets",
+        document_version_prefix(document_id, version_number)
+    )
+}
+
+fn document_asset_type_prefix(document_id: Uuid, version_number: i32, asset_type: &str) -> String {
+    format!(
+        "{}/{}",
+        document_asset_prefix(document_id, version_number),
+        asset_type
+    )
+}
+
+/// Returns the storage prefix under which the asset objects for a type/id pair live.
+pub fn document_asset_object_prefix(
+    document_id: Uuid,
+    version_number: i32,
+    asset_type: &str,
+    asset_id: Uuid,
+) -> String {
+    format!(
+        "{}/{}",
+        document_asset_type_prefix(document_id, version_number, asset_type),
+        asset_id
+    )
+}
+
+/// Returns the full storage key for a specific asset object (ordinal).
+pub fn document_asset_object_key(
+    document_id: Uuid,
+    version_number: i32,
+    asset_type: &str,
+    asset_id: Uuid,
+    ordinal: i32,
+) -> String {
+    format!(
+        "{}/{}",
+        document_asset_object_prefix(document_id, version_number, asset_type, asset_id),
+        ordinal
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn generates_expected_paths() {
+        let document_id = Uuid::nil();
+        let version_id = Uuid::nil();
+        let asset_id = Uuid::nil();
+
+        assert_eq!(
+            document_prefix(document_id),
+            format!("documents/{document_id}")
+        );
+
+        assert_eq!(
+            document_version_prefix(document_id, 3),
+            format!("documents/{document_id}/v3")
+        );
+
+        assert_eq!(
+            document_version_object_key(document_id, 3, version_id),
+            format!("documents/{document_id}/v3/{version_id}")
+        );
+
+        assert_eq!(
+            document_asset_object_prefix(document_id, 3, "preview", asset_id),
+            format!("documents/{document_id}/v3/assets/preview/{asset_id}")
+        );
+
+        assert_eq!(
+            document_asset_object_key(document_id, 3, "preview", asset_id, 2),
+            format!("documents/{document_id}/v3/assets/preview/{asset_id}/2")
+        );
+    }
+}

backend/src/utils/time.rs

@@ -0,0 +1,13 @@
+use chrono::{DateTime, NaiveDateTime, Utc};
+
+/// Format a timestamp as RFC3339 using UTC.
+pub fn to_iso(dt: NaiveDateTime) -> String {
+    DateTime::<Utc>::from_naive_utc_and_offset(dt, Utc).to_rfc3339()
+}
+
+/// Format a timestamp for HTTP headers (RFC 7231 date).
+pub fn to_http_date(dt: NaiveDateTime) -> String {
+    DateTime::<Utc>::from_naive_utc_and_offset(dt, Utc)
+        .format("%a, %d %b %Y %H:%M:%S GMT")
+        .to_string()
+}

backend/src/utils/tracing.rs

@@ -0,0 +1,14 @@
+use tracing_subscriber::EnvFilter;
+
+/// Initialize tracing with an optional default level.
+///
+/// Falls back to `default_level` when `RUST_LOG` is not provided.
+pub fn init_tracing(default_level: &str) {
+    let filter =
+        EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new(default_level));
+    tracing_subscriber::fmt()
+        .with_env_filter(filter)
+        .with_target(false)
+        .compact()
+        .init();
+}

backend/src/utils/validation.rs

@@ -0,0 +1,10 @@
+use crate::error::{AppError, AppResult};
+
+/// Ensure an entity exists, returning a bad request error when it does not.
+pub fn ensure_exists(exists: bool, entity: &str) -> AppResult<()> {
+    if exists {
+        Ok(())
+    } else {
+        Err(AppError::bad_request(format!("{entity} does not exist")))
+    }
+}

backend/src/workers/analyze.rs

@@ -3,7 +3,7 @@ use std::{collections::HashSet, sync::Arc, time::Duration};
 use async_trait::async_trait;
 use diesel::prelude::*;
 use serde::Deserialize;
-use serde_json::{json, Map, Value};
+use serde_json::json;
 use tokio::task;
 use tracing::{error, warn};
 use uuid::Uuid;
@@ -14,6 +14,7 @@ use crate::{
     models::{Document, DocumentAsset, DocumentVersion},
     schema::{document_assets, document_versions, documents},
     state::AppState,
+    storage::TenantStorage,
 };
 
 use super::{JobExecution, JobHandler};
@@ -40,7 +41,12 @@ impl JobHandler for AnalyzeDocumentJob {
         JOB_ANALYZE_DOCUMENT
     }
 
-    async fn handle(&self, state: Arc<AppState>, job: crate::models::Job) -> JobExecution {
+    async fn handle(
+        &self,
+        state: Arc<AppState>,
+        job: crate::models::Job,
+        _storage: TenantStorage,
+    ) -> JobExecution {
         let payload: AnalyzePayload = match serde_json::from_value(job.payload.clone()) {
             Ok(payload) => payload,
             Err(err) => {
@@ -51,7 +57,9 @@ impl JobHandler for AnalyzeDocumentJob {
         };
 
         let state_clone = state.clone();
-        match task::spawn_blocking(move || analyze_document(state_clone, payload)).await {
+        let tenant_id = job.tenant_id;
+        match task::spawn_blocking(move || analyze_document(state_clone, tenant_id, payload)).await
+        {
             Ok(Ok(execution)) => execution,
             Ok(Err(err)) => {
                 warn!(job_id = %job.id, error = %err, "analyze job will retry");
@@ -71,8 +79,14 @@ impl JobHandler for AnalyzeDocumentJob {
     }
 }
 
-fn analyze_document(state: Arc<AppState>, payload: AnalyzePayload) -> Result<JobExecution, String> {
+fn analyze_document(
-    let mut conn = state.db().map_err(|err| format!("{err:?}"))?;
+    state: Arc<AppState>,
+    tenant_id: Uuid,
+    payload: AnalyzePayload,
+) -> Result<JobExecution, String> {
+    let mut conn = state
+        .db_for_tenant(tenant_id)
+        .map_err(|err| format!("{err:?}"))?;
 
     let version: DocumentVersion = document_versions::table
         .find(payload.document_version_id)
@@ -88,47 +102,25 @@ fn analyze_document(state: Arc<AppState>, payload: AnalyzePayload) -> Result<Job
         .first(&mut conn)
         .map_err(|err| format!("{err:?}"))?;
 
-    let (supported, reason) = determine_thumbnail_support(&document);
+    let tenant_id = document.tenant_id;
+
+    let (supported, _reason) = determine_thumbnail_support(&document);
     let ocr_supported = document_is_pdf(&document);
 
     let existing_ocr: Option<DocumentAsset> = document_assets::table
         .filter(document_assets::document_version_id.eq(payload.document_version_id))
         .filter(document_assets::asset_type.eq(OCR_TEXT_ASSET_TYPE))
+        .filter(document_assets::tenant_id.eq(tenant_id))
         .first(&mut conn)
         .optional()
         .map_err(|err| format!("{err:?}"))?;
 
     let skip_ocr = existing_ocr.is_some() && !payload.force;
 
-    let mut summary_map = match version.operations_summary {
-        Value::Object(map) => map,
-        _ => Map::new(),
-    };
-    summary_map.insert("thumbnail_supported".to_string(), Value::Bool(supported));
-    if let Some(reason) = reason {
-        summary_map.insert("thumbnail_reason".to_string(), Value::String(reason));
-    } else {
-        summary_map.remove("thumbnail_reason");
-    }
-
-    summary_map.insert("ocr_supported".to_string(), Value::Bool(ocr_supported));
-    if ocr_supported {
-        summary_map.remove("ocr_reason");
-    } else {
-        summary_map.insert(
-            "ocr_reason".to_string(),
-            Value::String("document is not a PDF".into()),
-        );
-    }
-
-    diesel::update(document_versions::table.find(version.id))
-        .set(document_versions::operations_summary.eq(Value::Object(summary_map)))
-        .execute(&mut conn)
-        .map_err(|err| format!("{err:?}"))?;
-
     if supported {
         let enqueue_result = enqueue_job(
             &mut conn,
+            tenant_id,
             JOB_GENERATE_THUMBNAILS,
             json!({
                 "document_id": payload.document_id,
@@ -146,6 +138,7 @@ fn analyze_document(state: Arc<AppState>, payload: AnalyzePayload) -> Result<Job
     if ocr_supported && !skip_ocr {
         let enqueue_result = enqueue_job(
             &mut conn,
+            tenant_id,
             JOB_GENERATE_OCR_TEXT,
             json!({
                 "document_id": payload.document_id,

backend/src/workers/index.rs

@@ -12,9 +12,10 @@ use uuid::Uuid;
 
 use crate::{
     jobs::JOB_INDEX_DOCUMENT_TEXT,
-    models::{Document, DocumentAsset, DocumentVersion},
+    models::{Document, DocumentVersion},
-    schema::{document_assets, document_versions, documents},
+    schema::{document_asset_objects, document_assets, document_versions, documents},
     state::AppState,
+    storage::TenantStorage,
 };
 
 use super::{ocr::OCR_TEXT_ASSET_TYPE, JobExecution, JobHandler};
@@ -39,7 +40,12 @@ impl JobHandler for IndexDocumentTextJob {
         JOB_INDEX_DOCUMENT_TEXT
     }
 
-    async fn handle(&self, state: Arc<AppState>, job: crate::models::Job) -> JobExecution {
+    async fn handle(
+        &self,
+        state: Arc<AppState>,
+        job: crate::models::Job,
+        storage: TenantStorage,
+    ) -> JobExecution {
         let payload: IndexPayload = match serde_json::from_value(job.payload.clone()) {
             Ok(payload) => payload,
             Err(err) => {
@@ -52,16 +58,29 @@ impl JobHandler for IndexDocumentTextJob {
         let quickwit_endpoint = match &state.config.quickwit_endpoint {
             Some(endpoint) => endpoint.clone(),
             None => {
-                warn!("quickwit endpoint missing; skipping indexing");
+                return JobExecution::Failed {
-                return JobExecution::Success;
+                    error: "quickwit endpoint missing".into(),
+                };
             }
         };
 
-        let quickwit_index = match &state.config.quickwit_index {
+        let tenant = match state.tenants.get_by_id(job.tenant_id) {
-            Some(index) => index.clone(),
+            Ok(tenant) => tenant,
+            Err(err) => {
+                warn!(job_id = %job.id, error = ?err, "failed to load tenant for indexing");
+                return JobExecution::Retry {
+                    delay: Duration::from_secs(30),
+                    error: format!("failed to load tenant: {err:?}"),
+                };
+            }
+        };
+
+        let quickwit_index = match tenant.quickwit_index.clone() {
+            Some(index) => index,
             None => {
-                warn!("quickwit index missing; skipping indexing");
+                return JobExecution::Failed {
-                return JobExecution::Success;
+                    error: "tenant quickwit index not configured".into(),
+                };
             }
         };
 
@@ -87,15 +106,15 @@ impl JobHandler for IndexDocumentTextJob {
             }
         };
 
-        if context.text_asset.is_none() {
+        if context.text_s3_key.is_none() {
             warn!(job_id = %job.id, "missing OCR text asset; failing indexing job");
             return JobExecution::Failed {
                 error: "missing OCR text asset".into(),
             };
         }
 
-        let asset = context.text_asset.unwrap();
+        let s3_key = context.text_s3_key.unwrap();
-        let text = match state.storage.get_object(&asset.s3_key).await {
+        let text = match storage.get_object(&s3_key).await {
             Ok(bytes) => match String::from_utf8(bytes) {
                 Ok(text) => text,
                 Err(err) => {
@@ -129,6 +148,7 @@ impl JobHandler for IndexDocumentTextJob {
         let payload = json!({
             "document_id": context.document.id,
             "version_id": context.version.id,
+            "tenant_id": job.tenant_id,
             "title": context.document.title.to_lowercase(),
             "text": text.to_lowercase()
         });
@@ -169,15 +189,15 @@ impl JobHandler for IndexDocumentTextJob {
 struct IndexContext {
     document: Document,
     version: DocumentVersion,
-    text_asset: Option<DocumentAsset>,
+    text_s3_key: Option<String>,
 }
 
 fn load_context(state: Arc<AppState>, payload: &IndexPayload) -> Result<IndexContext, String> {
-    let mut conn = state.db().map_err(|err| format!("{err:?}"))?;
+    let mut base_conn = state.db_unscoped().map_err(|err| format!("{err:?}"))?;
 
     let version: DocumentVersion = document_versions::table
         .find(payload.document_version_id)
-        .first(&mut conn)
+        .first(&mut base_conn)
         .map_err(|err| format!("{err:?}"))?;
 
     if version.document_id != payload.document_id {
@@ -186,12 +206,26 @@ fn load_context(state: Arc<AppState>, payload: &IndexPayload) -> Result<IndexCon
 
     let document: Document = documents::table
         .find(payload.document_id)
-        .first(&mut conn)
+        .first(&mut base_conn)
         .map_err(|err| format!("{err:?}"))?;
 
-    let text_asset: Option<DocumentAsset> = document_assets::table
+    let tenant_id = document.tenant_id;
+    drop(base_conn);
+
+    let mut conn = state
+        .db_for_tenant(tenant_id)
+        .map_err(|err| format!("{err:?}"))?;
+
+    let text_s3_key: Option<String> = document_asset_objects::table
+        .inner_join(
+            document_assets::table.on(document_asset_objects::asset_id.eq(document_assets::id)),
+        )
         .filter(document_assets::document_version_id.eq(payload.document_version_id))
         .filter(document_assets::asset_type.eq(OCR_TEXT_ASSET_TYPE))
+        .filter(document_assets::tenant_id.eq(tenant_id))
+        .filter(document_asset_objects::ordinal.eq(1))
+        .filter(document_asset_objects::tenant_id.eq(tenant_id))
+        .select(document_asset_objects::s3_key)
         .first(&mut conn)
         .optional()
         .map_err(|err| format!("{err:?}"))?;
@@ -199,6 +233,6 @@ fn load_context(state: Arc<AppState>, payload: &IndexPayload) -> Result<IndexCon
     Ok(IndexContext {
         document,
         version,
-        text_asset,
+        text_s3_key,
     })
 }

backend/src/workers/mod.rs

@@ -8,6 +8,7 @@ use crate::{
     jobs::{mark_job_failed, mark_job_succeeded, reserve_job, retry_job_after, JobQueueError},
     models::Job,
     state::AppState,
+    storage::TenantStorage,
 };
 
 pub mod analyze;
@@ -25,7 +26,7 @@ pub enum JobExecution {
 #[async_trait]
 pub trait JobHandler: Send + Sync {
     fn job_type(&self) -> &'static str;
-    async fn handle(&self, state: Arc<AppState>, job: Job) -> JobExecution;
+    async fn handle(&self, state: Arc<AppState>, job: Job, storage: TenantStorage) -> JobExecution;
 }
 
 pub struct Worker {
@@ -71,7 +72,7 @@ impl Worker {
             return Ok(false);
         }
 
-        let mut conn = match self.state.db() {
+        let mut conn = match self.state.db_unscoped() {
             Ok(conn) => conn,
             Err(err) => {
                 error!(?err, "failed to obtain database connection in worker");
@@ -84,10 +85,22 @@ impl Worker {
 
         if let Some(job) = job_opt {
             if let Some(handler) = self.handlers.get(job.job_type.as_str()) {
-                let result = handler.handle(self.state.clone(), job.clone()).await;
+                let execution = match self.state.storage_for_tenant(job.tenant_id) {
-                match result {
+                    Ok(storage) => {
+                        handler
+                            .handle(self.state.clone(), job.clone(), storage)
+                            .await
+                    }
+                    Err(err) => {
+                        error!(job_id = %job.id, error = ?err, "failed to load tenant storage for job");
+                        JobExecution::Failed {
+                            error: format!("tenant storage unavailable: {err:?}"),
+                        }
+                    }
+                };
+                match execution {
                     JobExecution::Success => {
-                        if let Ok(mut conn) = self.state.db() {
+                        if let Ok(mut conn) = self.state.db_unscoped() {
                             mark_job_succeeded(&mut conn, job.id)?;
                             info!(job_id = %job.id, job_type = %job.job_type, "job completed successfully");
                         } else {
@@ -96,7 +109,7 @@ impl Worker {
                     }
                     JobExecution::Retry { delay, error } => {
                         warn!(job_id = %job.id, job_type = %job.job_type, %error, "job will retry");
-                        if let Ok(mut conn) = self.state.db() {
+                        if let Ok(mut conn) = self.state.db_unscoped() {
                             retry_job_after(&mut conn, job.id, delay, &error)?;
                         } else {
                             error!("failed to requeue job for retry due to pool error");
@@ -104,7 +117,7 @@ impl Worker {
                     }
                     JobExecution::Failed { error } => {
                         error!(job_id = %job.id, job_type = %job.job_type, %error, "job failed");
-                        if let Ok(mut conn) = self.state.db() {
+                        if let Ok(mut conn) = self.state.db_unscoped() {
                             mark_job_failed(&mut conn, job.id, &error)?;
                         } else {
                             error!("failed to mark job failed due to pool error");
@@ -113,7 +126,7 @@ impl Worker {
                 }
             } else {
                 error!(job_type = %job.job_type, "no handler registered for job type");
-                if let Ok(mut conn) = self.state.db() {
+                if let Ok(mut conn) = self.state.db_unscoped() {
                     mark_job_failed(&mut conn, job.id, "no handler registered")?;
                 } else {
                     error!("failed to mark job failed for missing handler due to pool error");

backend/src/workers/ocr.rs

@@ -18,10 +18,16 @@ use tracing::{error, info, warn};
 use uuid::Uuid;
 
 use crate::{
+    documents::asset::delete_asset,
     jobs::{enqueue_job, JOB_GENERATE_OCR_TEXT, JOB_INDEX_DOCUMENT_TEXT},
-    models::{Document, DocumentAsset, DocumentVersion, NewDocumentAsset},
+    models::{
-    schema::{document_assets, document_versions, documents},
+        Document, DocumentAsset, DocumentAssetObject, DocumentVersion, NewDocumentAsset,
+        NewDocumentAssetObject,
+    },
+    schema::{document_asset_objects, document_assets, document_versions, documents},
     state::AppState,
+    storage::TenantStorage,
+    utils::storage_paths::document_asset_object_prefix,
 };
 
 use super::{JobExecution, JobHandler};
@@ -51,7 +57,12 @@ impl JobHandler for GenerateOcrTextJob {
         JOB_GENERATE_OCR_TEXT
     }
 
-    async fn handle(&self, state: Arc<AppState>, job: crate::models::Job) -> JobExecution {
+    async fn handle(
+        &self,
+        state: Arc<AppState>,
+        job: crate::models::Job,
+        storage: TenantStorage,
+    ) -> JobExecution {
         let payload: OcrPayload = match serde_json::from_value(job.payload.clone()) {
             Ok(payload) => payload,
             Err(err) => {
@@ -88,7 +99,7 @@ impl JobHandler for GenerateOcrTextJob {
             return JobExecution::Success;
         }
 
-        let bytes = match state.storage.get_object(&context.version.s3_key).await {
+        let bytes = match storage.get_object(&context.version.s3_key).await {
             Ok(bytes) => bytes,
             Err(err) => {
                 warn!(job_id = %job.id, error = %err, "failed to fetch document for ocr");
@@ -123,19 +134,41 @@ impl JobHandler for GenerateOcrTextJob {
             };
         };
 
-        let asset_id = context
+        if let Some(existing_asset) = &context.existing_asset {
-            .existing_asset
+            for object in &context.existing_objects {
-            .as_ref()
+                if let Err(err) = storage.delete_object(&object.s3_key).await {
-            .map(|asset| asset.id)
+                    warn!(job_id = %job.id, error = %err, s3_key = %object.s3_key, "failed to delete existing ocr asset object");
-            .unwrap_or_else(Uuid::new_v4);
+                }
+            }
 
-        let s3_key = format!(
+            let tenant_id = context.document.tenant_id;
-            "documents/{}/v{}/assets/{}/{}",
+            let asset_id = existing_asset.id;
-            context.document.id, context.version.version_number, OCR_TEXT_ASSET_TYPE, asset_id
+            let state_clone = state.clone();
+            match task::spawn_blocking(move || {
+                delete_asset(state_clone.as_ref(), tenant_id, asset_id)
+            })
+            .await
+            {
+                Ok(Ok(())) => {}
+                Ok(Err(err)) => {
+                    warn!(job_id = %job.id, error = ?err, asset_id = %asset_id, "failed to remove ocr asset metadata after deletion");
+                }
+                Err(join_err) => {
+                    warn!(job_id = %job.id, error = %join_err, asset_id = %asset_id, "failed to remove ocr asset metadata: task panicked");
+                }
+            }
+        }
+
+        let asset_id = Uuid::new_v4();
+
+        let s3_key = document_asset_object_prefix(
+            context.document.id,
+            context.version.version_number,
+            OCR_TEXT_ASSET_TYPE,
+            asset_id,
         );
 
-        if let Err(err) = state
+        if let Err(err) = storage
-            .storage
             .put_object(
                 &s3_key,
                 generation.text.into_bytes(),
@@ -158,12 +191,9 @@ impl JobHandler for GenerateOcrTextJob {
         .await
         {
             Ok(Ok(())) => {
-                if state.config.quickwit_endpoint.is_some() && state.config.quickwit_index.is_some()
-                {
                 if let Err(err) = enqueue_index_job(&state, &payload) {
                     warn!(job_id = %job.id, error = %err, "failed to enqueue index job");
                 }
-                }
                 JobExecution::Success
             }
             Ok(Err(err)) => {
@@ -193,6 +223,7 @@ struct OcrContext {
     document: Document,
     version: DocumentVersion,
     existing_asset: Option<DocumentAsset>,
+    existing_objects: Vec<DocumentAssetObject>,
     skip: bool,
 }
 
@@ -202,11 +233,11 @@ struct OcrGeneration {
 }
 
 fn load_ocr_context(state: Arc<AppState>, payload: &OcrPayload) -> Result<OcrContext, String> {
-    let mut conn = state.db().map_err(|err| format!("{err:?}"))?;
+    let mut base_conn = state.db_unscoped().map_err(|err| format!("{err:?}"))?;
 
     let version: DocumentVersion = document_versions::table
         .find(payload.document_version_id)
-        .first(&mut conn)
+        .first(&mut base_conn)
         .map_err(|err| format!("{err:?}"))?;
 
     if version.document_id != payload.document_id {
@@ -215,32 +246,53 @@ fn load_ocr_context(state: Arc<AppState>, payload: &OcrPayload) -> Result<OcrCon
 
     let document: Document = documents::table
         .find(payload.document_id)
-        .first(&mut conn)
+        .first(&mut base_conn)
         .map_err(|err| format!("{err:?}"))?;
 
-    let existing: Option<DocumentAsset> = document_assets::table
+    let tenant_id = document.tenant_id;
+    drop(base_conn);
+
+    let mut conn = state
+        .db_for_tenant(tenant_id)
+        .map_err(|err| format!("{err:?}"))?;
+
+    let existing_asset: Option<DocumentAsset> = document_assets::table
         .filter(document_assets::document_version_id.eq(payload.document_version_id))
         .filter(document_assets::asset_type.eq(OCR_TEXT_ASSET_TYPE))
+        .filter(document_assets::tenant_id.eq(tenant_id))
         .first(&mut conn)
         .optional()
         .map_err(|err| format!("{err:?}"))?;
 
+    let existing_objects: Vec<DocumentAssetObject> = if let Some(asset) = &existing_asset {
+        document_asset_objects::table
+            .filter(document_asset_objects::asset_id.eq(asset.id))
+            .filter(document_asset_objects::tenant_id.eq(tenant_id))
+            .order(document_asset_objects::ordinal.asc())
+            .load(&mut conn)
+            .map_err(|err| format!("{err:?}"))?
+    } else {
+        Vec::new()
+    };
+
     let is_pdf = document_is_pdf(&document);
     if !is_pdf {
         return Ok(OcrContext {
             document,
             version,
-            existing_asset: existing,
+            existing_asset: existing_asset,
+            existing_objects,
             skip: true,
         });
     }
 
-    let skip = existing.is_some() && !payload.force;
+    let skip = existing_asset.is_some() && !payload.force;
 
     Ok(OcrContext {
         document,
         version,
-        existing_asset: existing,
+        existing_asset,
+        existing_objects,
         skip,
     })
 }
@@ -369,18 +421,28 @@ fn persist_ocr_metadata(
     s3_key: &str,
     source: &'static str,
 ) -> Result<(), String> {
-    let mut conn = state.db().map_err(|err| format!("{err:?}"))?;
+    let tenant_id = context.document.tenant_id;
+    let mut conn = state
+        .db_for_tenant(tenant_id)
+        .map_err(|err| format!("{err:?}"))?;
+
+    if let Some(existing_asset) = &context.existing_asset {
+        diesel::delete(document_assets::table.filter(document_assets::id.eq(existing_asset.id)))
+            .execute(&mut conn)
+            .map_err(|err| format!("{err:?}"))?;
+    }
 
     let new_asset = NewDocumentAsset {
         id: asset_id,
         document_version_id: context.version.id,
         asset_type: OCR_TEXT_ASSET_TYPE.to_string(),
-        s3_key: s3_key.to_string(),
         mime_type: "text/plain".to_string(),
         metadata: json!({
             "generated_at": Utc::now().to_rfc3339(),
             "source": source,
         }),
+        cardinality: Some(1),
+        tenant_id,
     };
 
     diesel::insert_into(document_assets::table)
@@ -391,9 +453,43 @@ fn persist_ocr_metadata(
         ))
         .do_update()
         .set((
-            document_assets::s3_key.eq(excluded(document_assets::s3_key)),
             document_assets::mime_type.eq(excluded(document_assets::mime_type)),
             document_assets::metadata.eq(excluded(document_assets::metadata)),
+            document_assets::cardinality.eq(excluded(document_assets::cardinality)),
+        ))
+        .execute(&mut conn)
+        .map_err(|err| format!("{err:?}"))?;
+
+    let existing_object_id: Option<Uuid> = document_asset_objects::table
+        .filter(document_asset_objects::asset_id.eq(asset_id))
+        .filter(document_asset_objects::ordinal.eq(1))
+        .filter(document_asset_objects::tenant_id.eq(tenant_id))
+        .select(document_asset_objects::id)
+        .first(&mut conn)
+        .optional()
+        .map_err(|err| format!("{err:?}"))?;
+
+    let object_id = existing_object_id.unwrap_or_else(Uuid::new_v4);
+
+    let new_object = NewDocumentAssetObject {
+        id: object_id,
+        asset_id,
+        ordinal: 1,
+        s3_key: s3_key.to_string(),
+        metadata: json!({}),
+        tenant_id,
+    };
+
+    diesel::insert_into(document_asset_objects::table)
+        .values(&new_object)
+        .on_conflict((
+            document_asset_objects::asset_id,
+            document_asset_objects::ordinal,
+        ))
+        .do_update()
+        .set((
+            document_asset_objects::s3_key.eq(excluded(document_asset_objects::s3_key)),
+            document_asset_objects::metadata.eq(excluded(document_asset_objects::metadata)),
         ))
         .execute(&mut conn)
         .map_err(|err| format!("{err:?}"))?;
@@ -402,9 +498,20 @@ fn persist_ocr_metadata(
 }
 
 fn enqueue_index_job(state: &AppState, payload: &OcrPayload) -> Result<(), String> {
-    let mut conn = state.db().map_err(|err| format!("{err:?}"))?;
+    let mut base_conn = state.db_unscoped().map_err(|err| format!("{err:?}"))?;
+    let tenant_id: Uuid = documents::table
+        .find(payload.document_id)
+        .select(documents::tenant_id)
+        .first(&mut base_conn)
+        .map_err(|err| format!("{err:?}"))?;
+    drop(base_conn);
+
+    let mut conn = state
+        .db_for_tenant(tenant_id)
+        .map_err(|err| format!("{err:?}"))?;
     enqueue_job(
         &mut conn,
+        tenant_id,
         JOB_INDEX_DOCUMENT_TEXT,
         json!({
             "document_id": payload.document_id,

backend/src/workers/thumbnails.rs

@@ -12,10 +12,16 @@ use tracing::{error, info, warn};
 use uuid::Uuid;
 
 use crate::{
+    documents::asset::delete_asset,
     jobs::JOB_GENERATE_THUMBNAILS,
-    models::{Document, DocumentAsset, DocumentVersion, NewDocumentAsset},
+    models::{
-    schema::{document_assets, document_versions, documents},
+        Document, DocumentAsset, DocumentAssetObject, DocumentVersion, NewDocumentAsset,
+        NewDocumentAssetObject,
+    },
+    schema::{document_asset_objects, document_assets, document_versions, documents},
     state::AppState,
+    storage::TenantStorage,
+    utils::storage_paths::document_asset_object_key,
 };
 
 use super::{analyze::determine_thumbnail_support, JobExecution, JobHandler};
@@ -49,7 +55,12 @@ impl JobHandler for GenerateThumbnailsJob {
         JOB_GENERATE_THUMBNAILS
     }
 
-    async fn handle(&self, state: Arc<AppState>, job: crate::models::Job) -> JobExecution {
+    async fn handle(
+        &self,
+        state: Arc<AppState>,
+        job: crate::models::Job,
+        storage: TenantStorage,
+    ) -> JobExecution {
         let payload: ThumbnailPayload = match serde_json::from_value(job.payload.clone()) {
             Ok(p) => p,
             Err(err) => {
@@ -85,7 +96,7 @@ impl JobHandler for GenerateThumbnailsJob {
             return JobExecution::Success;
         }
 
-        let bytes = match state.storage.get_object(&initial.version.s3_key).await {
+        let bytes = match storage.get_object(&initial.version.s3_key).await {
             Ok(bytes) => bytes,
             Err(err) => {
                 warn!(job_id = %job.id, error = %err, "thumbnail fetch failed; will retry");
@@ -142,86 +153,188 @@ impl JobHandler for GenerateThumbnailsJob {
             }
         }
 
-        let thumbnail_asset_id = initial
+        if let Some(existing_preview) = &initial.existing_preview {
-            .existing_thumbnail
+            for object in &initial.existing_preview_objects {
-            .as_ref()
+                if let Err(err) = storage.delete_object(&object.s3_key).await {
-            .map(|asset| asset.id)
+                    warn!(
-            .unwrap_or_else(Uuid::new_v4);
+                        job_id = %job.id,
-        let thumbnail_s3_key = format!(
+                        error = %err,
-            "documents/{}/v{}/assets/{}/{}",
+                        s3_key = %object.s3_key,
-            initial.document.id,
+                        "failed to delete existing preview object"
-            initial.version.version_number,
-            THUMBNAIL_ASSET_TYPE,
-            thumbnail_asset_id
                     );
+                }
+            }
 
-        let preview_asset_id = initial
+            let tenant_id = initial.document.tenant_id;
-            .existing_preview
+            let asset_id = existing_preview.id;
-            .as_ref()
+            let state_clone = state.clone();
-            .map(|asset| asset.id)
+            match task::spawn_blocking(move || {
-            .unwrap_or_else(Uuid::new_v4);
+                delete_asset(state_clone.as_ref(), tenant_id, asset_id)
-        let preview_s3_key = format!(
+            })
-            "documents/{}/v{}/assets/{}/{}",
+            .await
+            {
+                Ok(Ok(())) => {}
+                Ok(Err(err)) => {
+                    warn!(
+                        job_id = %job.id,
+                        error = ?err,
+                        asset_id = %asset_id,
+                        "failed to remove preview metadata after deletion"
+                    );
+                }
+                Err(join_err) => {
+                    warn!(
+                        job_id = %job.id,
+                        error = %join_err,
+                        asset_id = %asset_id,
+                        "failed to remove preview metadata: task panicked"
+                    );
+                }
+            }
+        }
+
+        if let Some(existing_thumbnail) = &initial.existing_thumbnail {
+            for object in &initial.existing_thumbnail_objects {
+                if let Err(err) = storage.delete_object(&object.s3_key).await {
+                    warn!(
+                        job_id = %job.id,
+                        error = %err,
+                        s3_key = %object.s3_key,
+                        "failed to delete existing thumbnail object"
+                    );
+                }
+            }
+
+            let tenant_id = initial.document.tenant_id;
+            let asset_id = existing_thumbnail.id;
+            let state_clone = state.clone();
+            match task::spawn_blocking(move || {
+                delete_asset(state_clone.as_ref(), tenant_id, asset_id)
+            })
+            .await
+            {
+                Ok(Ok(())) => {}
+                Ok(Err(err)) => {
+                    warn!(
+                        job_id = %job.id,
+                        error = ?err,
+                        asset_id = %asset_id,
+                        "failed to remove thumbnail metadata after deletion"
+                    );
+                }
+                Err(join_err) => {
+                    warn!(
+                        job_id = %job.id,
+                        error = %join_err,
+                        asset_id = %asset_id,
+                        "failed to remove thumbnail metadata: task panicked"
+                    );
+                }
+            }
+        }
+
+        let preview_asset_id = Uuid::new_v4();
+
+        let thumbnail_asset_id = Uuid::new_v4();
+
+        let mut preview_objects: Vec<AssetObjectPersistence> =
+            Vec::with_capacity(generation.preview.objects.len());
+        for (index, image) in generation.preview.objects.iter().enumerate() {
+            if index + 1 > i32::MAX as usize {
+                return JobExecution::Failed {
+                    error: "too many preview objects".to_string(),
+                };
+            }
+            let ordinal = (index + 1) as i32;
+            let s3_key = document_asset_object_key(
                 initial.document.id,
                 initial.version.version_number,
                 PREVIEW_ASSET_TYPE,
-            preview_asset_id
+                preview_asset_id,
+                ordinal,
             );
 
-        if let Err(err) = state
+            if let Err(err) = storage
-            .storage
                 .put_object(
-                &preview_s3_key,
+                    &s3_key,
-                generation.preview.image_bytes.clone(),
+                    image.image_bytes.clone(),
                     Some("image/png".into()),
                     None,
                 )
                 .await
             {
-            warn!(job_id = %job.id, error = %err, "failed to upload preview; retrying");
+                warn!(job_id = %job.id, error = %err, ordinal, "failed to upload preview; retrying");
                 return JobExecution::Retry {
                     delay: Duration::from_secs(30),
                     error: err.to_string(),
                 };
             }
 
-        if let Err(err) = state
+            preview_objects.push(AssetObjectPersistence {
-            .storage
+                ordinal,
+                s3_key,
+                width: image.width,
+                height: image.height,
+            });
+        }
+
+        let mut thumbnail_objects: Vec<AssetObjectPersistence> =
+            Vec::with_capacity(generation.thumbnail.objects.len());
+        for (index, image) in generation.thumbnail.objects.iter().enumerate() {
+            if index + 1 > i32::MAX as usize {
+                return JobExecution::Failed {
+                    error: "too many thumbnail objects".to_string(),
+                };
+            }
+            let ordinal = (index + 1) as i32;
+            let s3_key = document_asset_object_key(
+                initial.document.id,
+                initial.version.version_number,
+                THUMBNAIL_ASSET_TYPE,
+                thumbnail_asset_id,
+                ordinal,
+            );
+
+            if let Err(err) = storage
                 .put_object(
-                &thumbnail_s3_key,
+                    &s3_key,
-                generation.thumbnail.image_bytes.clone(),
+                    image.image_bytes.clone(),
                     Some("image/png".into()),
                     None,
                 )
                 .await
             {
-            warn!(job_id = %job.id, error = %err, "failed to upload thumbnail; retrying");
+                warn!(job_id = %job.id, error = %err, ordinal, "failed to upload thumbnail; retrying");
                 return JobExecution::Retry {
                     delay: Duration::from_secs(30),
                     error: err.to_string(),
                 };
             }
 
-        let state_clone = state.clone();
+            thumbnail_objects.push(AssetObjectPersistence {
-        match task::spawn_blocking(move || {
+                ordinal,
-            persist_assets_metadata(
+                s3_key,
-                state_clone,
+                width: image.width,
-                &initial,
+                height: image.height,
-                &[
+            });
+        }
+
+        let asset_persistences = vec![
             AssetPersistence {
                 asset_type: PREVIEW_ASSET_TYPE,
                 asset_id: preview_asset_id,
-                        s3_key: &preview_s3_key,
+                objects: preview_objects,
-                        generated: &generation.preview,
             },
             AssetPersistence {
                 asset_type: THUMBNAIL_ASSET_TYPE,
                 asset_id: thumbnail_asset_id,
-                        s3_key: &thumbnail_s3_key,
+                objects: thumbnail_objects,
-                        generated: &generation.thumbnail,
             },
-                ],
+        ];
-            )
+
+        let state_clone = state.clone();
+        match task::spawn_blocking(move || {
+            persist_assets_metadata(state_clone, &initial, &asset_persistences)
         })
         .await
         {
@@ -250,7 +363,9 @@ struct ThumbnailContext {
     document: Document,
     version: DocumentVersion,
     existing_thumbnail: Option<DocumentAsset>,
+    existing_thumbnail_objects: Vec<DocumentAssetObject>,
     existing_preview: Option<DocumentAsset>,
+    existing_preview_objects: Vec<DocumentAssetObject>,
     skip: bool,
 }
 
@@ -260,24 +375,34 @@ struct GeneratedImage {
     height: Option<i32>,
 }
 
+struct GeneratedAsset {
+    objects: Vec<GeneratedImage>,
+}
+
 struct GeneratedAssets {
-    thumbnail: GeneratedImage,
+    thumbnail: GeneratedAsset,
-    preview: GeneratedImage,
+    preview: GeneratedAsset,
     page_count: Option<u32>,
 }
 
-struct AssetPersistence<'a> {
+struct AssetObjectPersistence {
+    ordinal: i32,
+    s3_key: String,
+    width: Option<i32>,
+    height: Option<i32>,
+}
+
+struct AssetPersistence {
     asset_type: &'static str,
     asset_id: Uuid,
-    s3_key: &'a str,
+    objects: Vec<AssetObjectPersistence>,
-    generated: &'a GeneratedImage,
 }
 
 fn load_thumbnail_context(
     state: Arc<AppState>,
     payload: &ThumbnailPayload,
 ) -> Result<ThumbnailContext, String> {
-    let mut conn = state.db().map_err(|err| format!("{err:?}"))?;
+    let mut conn = state.db_unscoped().map_err(|err| format!("{err:?}"))?;
 
     let version: DocumentVersion = document_versions::table
         .find(payload.document_version_id)
@@ -293,21 +418,42 @@ fn load_thumbnail_context(
         .first(&mut conn)
         .map_err(|err| format!("{err:?}"))?;
 
+    let tenant_id = document.tenant_id;
+
     let existing_assets: Vec<DocumentAsset> = document_assets::table
         .filter(document_assets::document_version_id.eq(payload.document_version_id))
         .filter(document_assets::asset_type.eq_any(vec![
             THUMBNAIL_ASSET_TYPE.to_string(),
             PREVIEW_ASSET_TYPE.to_string(),
         ]))
+        .filter(document_assets::tenant_id.eq(tenant_id))
         .load(&mut conn)
         .map_err(|err| format!("{err:?}"))?;
 
     let mut existing_thumbnail = None;
+    let mut existing_thumbnail_objects: Vec<DocumentAssetObject> = Vec::new();
     let mut existing_preview = None;
+    let mut existing_preview_objects: Vec<DocumentAssetObject> = Vec::new();
     for asset in existing_assets {
         match asset.asset_type.as_str() {
-            THUMBNAIL_ASSET_TYPE => existing_thumbnail = Some(asset),
+            THUMBNAIL_ASSET_TYPE => {
-            PREVIEW_ASSET_TYPE => existing_preview = Some(asset),
+                existing_thumbnail_objects = document_asset_objects::table
+                    .filter(document_asset_objects::asset_id.eq(asset.id))
+                    .filter(document_asset_objects::tenant_id.eq(tenant_id))
+                    .order(document_asset_objects::ordinal.asc())
+                    .load(&mut conn)
+                    .map_err(|err| format!("{err:?}"))?;
+                existing_thumbnail = Some(asset);
+            }
+            PREVIEW_ASSET_TYPE => {
+                existing_preview_objects = document_asset_objects::table
+                    .filter(document_asset_objects::asset_id.eq(asset.id))
+                    .filter(document_asset_objects::tenant_id.eq(tenant_id))
+                    .order(document_asset_objects::ordinal.asc())
+                    .load(&mut conn)
+                    .map_err(|err| format!("{err:?}"))?;
+                existing_preview = Some(asset);
+            }
             _ => {}
         }
     }
@@ -317,13 +463,33 @@ fn load_thumbnail_context(
         return Err("thumbnail generation not supported for this document".into());
     }
 
-    let skip = existing_thumbnail.is_some() && existing_preview.is_some() && !payload.force;
+    let expected_cardinality = expected_asset_cardinality(&document, &version);
+    let preview_cardinality = existing_preview
+        .as_ref()
+        .and_then(|asset| asset.cardinality)
+        .unwrap_or_else(|| existing_preview_objects.len() as i32);
+    let thumbnail_cardinality = existing_thumbnail
+        .as_ref()
+        .and_then(|asset| asset.cardinality)
+        .unwrap_or_else(|| existing_thumbnail_objects.len() as i32);
+
+    let needs_regeneration = preview_cardinality < expected_cardinality
+        || thumbnail_cardinality < expected_cardinality
+        || (existing_preview_objects.len() as i32) < expected_cardinality
+        || (existing_thumbnail_objects.len() as i32) < expected_cardinality;
+
+    let skip = existing_thumbnail.is_some()
+        && existing_preview.is_some()
+        && !payload.force
+        && !needs_regeneration;
 
     Ok(ThumbnailContext {
         document,
         version,
         existing_thumbnail,
+        existing_thumbnail_objects,
         existing_preview,
+        existing_preview_objects,
         skip,
     })
 }
@@ -332,18 +498,7 @@ fn generate_preview_and_thumbnail(
     document: &Document,
     bytes: &[u8],
 ) -> Result<GeneratedAssets, String> {
-    let is_pdf = document
+    let is_pdf = document_is_pdf(document);
-        .content_type
-        .as_deref()
-        .map(|mime| mime == "application/pdf")
-        .unwrap_or_else(|| {
-            document
-                .original_name
-                .rsplit('.')
-                .next()
-                .map(|ext| ext.eq_ignore_ascii_case("pdf"))
-                .unwrap_or(false)
-        });
 
     if is_pdf {
         let pdf_assets = generate_pdf_assets(bytes)?;
@@ -362,7 +517,7 @@ fn generate_preview_and_thumbnail(
     }
 }
 
-fn generate_image_assets(bytes: &[u8]) -> Result<(GeneratedImage, GeneratedImage), String> {
+fn generate_image_assets(bytes: &[u8]) -> Result<(GeneratedAsset, GeneratedAsset), String> {
     let reader = ImageReader::new(Cursor::new(bytes))
         .with_guessed_format()
         .map_err(|err| err.to_string())?;
@@ -384,12 +539,19 @@ fn generate_image_assets(bytes: &[u8]) -> Result<(GeneratedImage, GeneratedImage
     let preview = encode_dynamic_image(preview_image)?;
     let thumbnail = encode_dynamic_image(thumbnail_image)?;
 
-    Ok((preview, thumbnail))
+    Ok((
+        GeneratedAsset {
+            objects: vec![preview],
+        },
+        GeneratedAsset {
+            objects: vec![thumbnail],
+        },
+    ))
 }
 
 struct PdfGeneratedAssets {
-    preview: GeneratedImage,
+    preview: GeneratedAsset,
-    thumbnail: GeneratedImage,
+    thumbnail: GeneratedAsset,
     page_count: u32,
 }
 
@@ -402,11 +564,7 @@ fn generate_pdf_assets(bytes: &[u8]) -> Result<PdfGeneratedAssets, String> {
         .map_err(|err| format!("load pdf: {err}"))?;
 
     let pages = document.pages();
-    let total_pages = pages.len();
+    let total_pages = pages.len() as usize;
-
-    let page = pages
-        .get(0)
-        .map_err(|err| format!("load first page: {err}"))?;
 
     let render_config = PdfRenderConfig::new()
         .set_target_width(PREVIEW_WIDTH as i32)
@@ -414,30 +572,44 @@ fn generate_pdf_assets(bytes: &[u8]) -> Result<PdfGeneratedAssets, String> {
         .render_form_data(true)
         .rotate_if_landscape(PdfPageRenderRotation::None, true);
 
+    let mut preview_objects: Vec<GeneratedImage> = Vec::with_capacity(total_pages);
+    let mut thumbnail_objects: Vec<GeneratedImage> = Vec::with_capacity(total_pages);
+
+    for page_index in 0..total_pages {
+        let page = pages
+            .get(u16::try_from(page_index).map_err(|_| "page index overflow".to_string())?)
+            .map_err(|err| format!("load page {page_index}: {err}"))?;
+
         let bitmap = page
             .render_with_config(&render_config)
-        .map_err(|err| format!("render pdf page: {err}"))?;
+            .map_err(|err| format!("render pdf page {page_index}: {err}"))?;
 
         let preview_buffer = bitmap.as_image().to_rgb8();
         let preview_image = image::DynamicImage::ImageRgb8(preview_buffer);
 
-    let thumbnail_image =
+        let thumbnail_image = if preview_image.width() > THUMBNAIL_WIDTH
-        if preview_image.width() > THUMBNAIL_WIDTH || preview_image.height() > THUMBNAIL_HEIGHT {
+            || preview_image.height() > THUMBNAIL_HEIGHT
+        {
             preview_image.thumbnail(THUMBNAIL_WIDTH, THUMBNAIL_HEIGHT)
         } else {
             preview_image.clone()
         };
 
-    let preview = encode_dynamic_image(preview_image)?;
+        preview_objects.push(encode_dynamic_image(preview_image)?);
-    let thumbnail = encode_dynamic_image(thumbnail_image)?;
+        thumbnail_objects.push(encode_dynamic_image(thumbnail_image)?);
+    }
 
     let page_count: u32 = total_pages
         .try_into()
         .map_err(|_| "page count exceeds supported range".to_string())?;
 
     Ok(PdfGeneratedAssets {
-        preview,
+        preview: GeneratedAsset {
-        thumbnail,
+            objects: preview_objects,
+        },
+        thumbnail: GeneratedAsset {
+            objects: thumbnail_objects,
+        },
         page_count,
     })
 }
@@ -458,22 +630,51 @@ fn encode_dynamic_image(image: image::DynamicImage) -> Result<GeneratedImage, St
 fn persist_assets_metadata(
     state: Arc<AppState>,
     context: &ThumbnailContext,
-    assets: &[AssetPersistence<'_>],
+    assets: &[AssetPersistence],
 ) -> Result<(), String> {
-    let mut conn = state.db().map_err(|err| format!("{err:?}"))?;
+    let tenant_id = context.document.tenant_id;
+    let mut conn = state
+        .db_for_tenant(tenant_id)
+        .map_err(|err| format!("{err:?}"))?;
+
+    if let Some(existing_preview) = &context.existing_preview {
+        diesel::delete(document_assets::table.filter(document_assets::id.eq(existing_preview.id)))
+            .execute(&mut conn)
+            .map_err(|err| format!("{err:?}"))?;
+    }
+
+    if let Some(existing_thumbnail) = &context.existing_thumbnail {
+        diesel::delete(
+            document_assets::table.filter(document_assets::id.eq(existing_thumbnail.id)),
+        )
+        .execute(&mut conn)
+        .map_err(|err| format!("{err:?}"))?;
+    }
 
     for asset in assets {
+        if asset.objects.is_empty() {
+            return Err(format!(
+                "asset {} has no generated objects",
+                asset.asset_type
+            ));
+        }
+
+        let object_count: i32 = asset
+            .objects
+            .len()
+            .try_into()
+            .map_err(|_| "asset contains too many objects".to_string())?;
+
         let new_asset = NewDocumentAsset {
             id: asset.asset_id,
             document_version_id: context.version.id,
             asset_type: asset.asset_type.to_string(),
-            s3_key: asset.s3_key.to_string(),
             mime_type: "image/png".to_string(),
             metadata: json!({
                 "generated_at": Utc::now().to_rfc3339(),
-                "width": asset.generated.width,
-                "height": asset.generated.height,
             }),
+            cardinality: Some(object_count),
+            tenant_id,
         };
 
         diesel::insert_into(document_assets::table)
@@ -484,12 +685,46 @@ fn persist_assets_metadata(
             ))
             .do_update()
             .set((
-                document_assets::s3_key.eq(excluded(document_assets::s3_key)),
                 document_assets::mime_type.eq(excluded(document_assets::mime_type)),
                 document_assets::metadata.eq(excluded(document_assets::metadata)),
+                document_assets::cardinality.eq(excluded(document_assets::cardinality)),
             ))
             .execute(&mut conn)
             .map_err(|err| format!("{err:?}"))?;
+
+        diesel::delete(
+            document_asset_objects::table
+                .filter(document_asset_objects::asset_id.eq(asset.asset_id))
+                .filter(document_asset_objects::tenant_id.eq(tenant_id)),
+        )
+        .execute(&mut conn)
+        .map_err(|err| format!("{err:?}"))?;
+
+        for object in &asset.objects {
+            let mut metadata_map = Map::new();
+            if let Some(width) = object.width {
+                metadata_map.insert("width".to_string(), Value::from(width));
+            }
+            if let Some(height) = object.height {
+                metadata_map.insert("height".to_string(), Value::from(height));
+            }
+
+            let object_metadata = Value::Object(metadata_map);
+
+            let new_object = NewDocumentAssetObject {
+                id: Uuid::new_v4(),
+                asset_id: asset.asset_id,
+                ordinal: object.ordinal,
+                s3_key: object.s3_key.clone(),
+                metadata: object_metadata,
+                tenant_id,
+            };
+
+            diesel::insert_into(document_asset_objects::table)
+                .values(&new_object)
+                .execute(&mut conn)
+                .map_err(|err| format!("{err:?}"))?;
+        }
     }
 
     Ok(())
@@ -501,11 +736,17 @@ fn persist_document_page_count(
     document_version_id: Uuid,
     page_count: u32,
 ) -> Result<(), String> {
-    let mut conn = state.db().map_err(|err| format!("{err:?}"))?;
+    let mut conn = state.db_unscoped().map_err(|err| format!("{err:?}"))?;
+    let tenant_id: Uuid = documents::table
+        .find(document_id)
+        .select(documents::tenant_id)
+        .first(&mut conn)
+        .map_err(|err| format!("{err:?}"))?;
 
     let existing_metadata: Value = document_versions::table
         .filter(document_versions::id.eq(document_version_id))
         .filter(document_versions::document_id.eq(document_id))
+        .filter(document_versions::tenant_id.eq(tenant_id))
         .select(document_versions::metadata)
         .first(&mut conn)
         .map_err(|err| format!("{err:?}"))?;
@@ -525,7 +766,8 @@ fn persist_document_page_count(
     diesel::update(
         document_versions::table
             .filter(document_versions::id.eq(document_version_id))
-            .filter(document_versions::document_id.eq(document_id)),
+            .filter(document_versions::document_id.eq(document_id))
+            .filter(document_versions::tenant_id.eq(tenant_id)),
     )
     .set(document_versions::metadata.eq(updated))
     .execute(&mut conn)
@@ -533,3 +775,37 @@ fn persist_document_page_count(
 
     Ok(())
 }
+
+fn document_is_pdf(document: &Document) -> bool {
+    document
+        .content_type
+        .as_deref()
+        .map(|mime| mime.eq_ignore_ascii_case("application/pdf"))
+        .unwrap_or_else(|| {
+            document
+                .original_name
+                .rsplit('.')
+                .next()
+                .map(|ext| ext.eq_ignore_ascii_case("pdf"))
+                .unwrap_or(false)
+        })
+}
+
+fn expected_asset_cardinality(document: &Document, version: &DocumentVersion) -> i32 {
+    if let Value::Object(map) = &version.metadata {
+        if let Some(count) = map.get("page_count").and_then(|v| v.as_i64()) {
+            if count > 0 {
+                return count
+                    .min(i64::from(i32::MAX))
+                    .try_into()
+                    .unwrap_or(i32::MAX);
+            }
+        }
+    }
+
+    if document_is_pdf(document) {
+        1
+    } else {
+        1
+    }
+}

backend/tests/auth_flow.rs

@@ -1,14 +1,47 @@
 mod common;
 
-use anyhow::Result;
+use anyhow::{anyhow, Context, Result};
-use axum::http::StatusCode;
+use axum::body::Body;
+use axum::http::{header::SET_COOKIE, StatusCode};
+use backend::models::NewUserMembership;
+use backend::schema::{tenants, user_memberships};
 use common::{acquire_db_lock, body_to_vec, TestApp};
+use diesel::prelude::*;
 use serde::Deserialize;
+use serde_json::json;
+use uuid::Uuid;
 
 #[derive(Deserialize)]
 struct AuthenticatedUser {
     username: String,
-    role: String,
+}
+
+#[derive(Deserialize)]
+struct ErrorResponse {
+    error: String,
+}
+
+#[derive(Deserialize)]
+struct LoginTenant {
+    slug: String,
+}
+
+#[derive(Deserialize)]
+struct LoginResponse {
+    access_token: String,
+    tenant: LoginTenant,
+}
+
+#[derive(Deserialize)]
+struct TenantSelectionResponse {
+    access_token: String,
+    tenants: Vec<TenantSummary>,
+}
+
+#[derive(Deserialize)]
+struct TenantSummary {
+    tenant_id: Uuid,
+    slug: String,
 }
 
 #[tokio::test]
@@ -19,16 +52,244 @@ async fn login_and_me_roundtrip() -> Result<()> {
     let password = "s3cret";
     app.insert_user("alice", password, "admin").await?;
 
-    let token = app.login_token("alice", password).await?;
+    let (login, _) = login_with_session(&app, "alice", password).await?;
 
-    let response = app.get("/api/auth/me", Some(&token)).await?;
+    let response = app.get("/api/auth/me", Some(&login.access_token)).await?;
     assert_eq!(response.status(), StatusCode::OK);
     let body = body_to_vec(response.into_body()).await?;
     let user: AuthenticatedUser = serde_json::from_slice(&body)?;
 
     assert_eq!(user.username, "alice");
-    assert_eq!(user.role, "admin");
 
     app.cleanup().await?;
     Ok(())
 }
+
+#[tokio::test]
+async fn login_rejects_unknown_user() -> Result<()> {
+    let _lock = acquire_db_lock().await;
+    let app = TestApp::new().await?;
+
+    let payload = json!({ "username": "ghost", "password": "nope" });
+    let response = app.post_json("/api/auth/login", &payload, None).await?;
+    assert_eq!(response.status(), StatusCode::UNAUTHORIZED);
+    let body = body_to_vec(response.into_body()).await?;
+    let err: ErrorResponse = serde_json::from_slice(&body)?;
+    assert_eq!(err.error, "unauthorized");
+
+    app.cleanup().await?;
+    Ok(())
+}
+
+#[tokio::test]
+async fn login_rejects_invalid_password() -> Result<()> {
+    let _lock = acquire_db_lock().await;
+    let app = TestApp::new().await?;
+
+    let password = "valid";
+    app.insert_user("robin", password, "admin").await?;
+
+    let payload = json!({ "username": "robin", "password": "wrong" });
+    let response = app.post_json("/api/auth/login", &payload, None).await?;
+    assert_eq!(response.status(), StatusCode::UNAUTHORIZED);
+    let body = body_to_vec(response.into_body()).await?;
+    let err: ErrorResponse = serde_json::from_slice(&body)?;
+    assert_eq!(err.error, "unauthorized");
+
+    app.cleanup().await?;
+    Ok(())
+}
+
+#[tokio::test]
+async fn refresh_rotates_refresh_token() -> Result<()> {
+    let _lock = acquire_db_lock().await;
+    let app = TestApp::new().await?;
+
+    let password = "rotate";
+    app.insert_user("rita", password, "admin").await?;
+
+    let (login, refresh_cookie) = login_with_session(&app, "rita", password).await?;
+
+    let response = app
+        .post_json_with_cookie("/api/auth/refresh", &json!({}), None, Some(&refresh_cookie))
+        .await?;
+    assert_eq!(response.status(), StatusCode::OK);
+    let new_cookie = extract_refresh_cookie(response.headers())?;
+    let body = body_to_vec(response.into_body()).await?;
+    let refreshed: LoginResponse = serde_json::from_slice(&body)?;
+    assert_eq!(refreshed.tenant.slug, login.tenant.slug);
+
+    let me_response = app
+        .get("/api/auth/me", Some(&refreshed.access_token))
+        .await?;
+    assert_eq!(me_response.status(), StatusCode::OK);
+
+    let retry = app
+        .post_json_with_cookie("/api/auth/refresh", &json!({}), None, Some(&refresh_cookie))
+        .await?;
+    assert_eq!(retry.status(), StatusCode::UNAUTHORIZED);
+
+    // new cookie should differ from old to avoid reuse
+    assert_ne!(new_cookie, refresh_cookie);
+
+    app.cleanup().await?;
+    Ok(())
+}
+
+#[tokio::test]
+async fn logout_revokes_refresh_token() -> Result<()> {
+    let _lock = acquire_db_lock().await;
+    let app = TestApp::new().await?;
+
+    let password = "logout";
+    app.insert_user("logan", password, "admin").await?;
+
+    let (login, refresh_cookie) = login_with_session(&app, "logan", password).await?;
+
+    let response = app
+        .post_json_with_cookie(
+            "/api/auth/logout",
+            &json!({}),
+            Some(&login.access_token),
+            Some(&refresh_cookie),
+        )
+        .await?;
+    assert_eq!(response.status(), StatusCode::NO_CONTENT);
+    let cleared_cookie = extract_refresh_cookie(response.headers())?;
+    assert!(cleared_cookie.ends_with("="));
+
+    let after_logout = app
+        .post_json_with_cookie("/api/auth/refresh", &json!({}), None, Some(&refresh_cookie))
+        .await?;
+    assert_eq!(after_logout.status(), StatusCode::UNAUTHORIZED);
+
+    app.cleanup().await?;
+    Ok(())
+}
+
+#[tokio::test]
+async fn me_requires_authentication() -> Result<()> {
+    let _lock = acquire_db_lock().await;
+    let app = TestApp::new().await?;
+
+    let unauthenticated = app.get("/api/auth/me", None).await?;
+    assert_eq!(unauthenticated.status(), StatusCode::UNAUTHORIZED);
+
+    let invalid = app.get("/api/auth/me", Some("invalid")).await?;
+    assert_eq!(invalid.status(), StatusCode::UNAUTHORIZED);
+
+    app.cleanup().await?;
+    Ok(())
+}
+
+#[tokio::test]
+async fn login_returns_tenant_selection_when_multiple_memberships() -> Result<()> {
+    let _lock = acquire_db_lock().await;
+    let app = TestApp::new().await?;
+
+    let password = "multipass";
+    let user_id = app.insert_user("multipass", password, "admin").await?;
+
+    let secondary_slug = "secondary".to_string();
+    let slug_for_insert = secondary_slug.clone();
+    let secondary_id = Uuid::new_v4();
+    app.with_conn(move |conn| {
+        diesel::insert_into(tenants::table)
+            .values((
+                tenants::id.eq(secondary_id),
+                tenants::slug.eq(&slug_for_insert),
+            ))
+            .execute(conn)?;
+
+        let membership = NewUserMembership {
+            id: Uuid::new_v4(),
+            user_id,
+            tenant_id: secondary_id,
+            role: "admin".to_string(),
+        };
+
+        diesel::insert_into(user_memberships::table)
+            .values(&membership)
+            .execute(conn)?;
+        Ok(())
+    })
+    .await?;
+
+    let payload = json!({ "username": "multipass", "password": password });
+    let response = app.post_json("/api/auth/login", &payload, None).await?;
+    assert_eq!(response.status(), StatusCode::OK);
+    let body = body_to_vec(response.into_body()).await?;
+    let selection: TenantSelectionResponse = serde_json::from_slice(&body)?;
+    assert!(selection.tenants.len() >= 2);
+    let secondary = selection
+        .tenants
+        .iter()
+        .find(|tenant| tenant.slug == secondary_slug)
+        .map(|t| t.tenant_id)
+        .context("secondary tenant missing from selection")?;
+
+    let select_response = app
+        .post_json(
+            "/api/auth/select-tenant",
+            &json!({ "tenant_id": secondary }),
+            Some(&selection.access_token),
+        )
+        .await?;
+    assert_eq!(select_response.status(), StatusCode::OK);
+    let session_cookie = extract_refresh_cookie(select_response.headers())?;
+    let select_body = body_to_vec(select_response.into_body()).await?;
+    let login: LoginResponse = serde_json::from_slice(&select_body)?;
+    assert_eq!(login.tenant.slug, secondary_slug);
+
+    let me_response = app.get("/api/auth/me", Some(&login.access_token)).await?;
+    assert_eq!(me_response.status(), StatusCode::OK);
+
+    let refresh_response = app
+        .post_json_with_cookie("/api/auth/refresh", &json!({}), None, Some(&session_cookie))
+        .await?;
+    assert_eq!(refresh_response.status(), StatusCode::OK);
+
+    app.cleanup().await?;
+    Ok(())
+}
+
+async fn login_with_session(
+    app: &TestApp,
+    username: &str,
+    password: &str,
+) -> Result<(LoginResponse, String)> {
+    let payload = json!({ "username": username, "password": password });
+    let response = app.post_json("/api/auth/login", &payload, None).await?;
+    ensure_status(&response, StatusCode::OK)?;
+    let refresh_cookie = extract_refresh_cookie(response.headers())?;
+    let body = body_to_vec(response.into_body()).await?;
+    let login: LoginResponse = serde_json::from_slice(&body)
+        .map_err(|_| anyhow!("expected login response with session"))?;
+    Ok((login, refresh_cookie))
+}
+
+fn extract_refresh_cookie(headers: &axum::http::HeaderMap) -> Result<String> {
+    let header_value = headers
+        .get(SET_COOKIE)
+        .context("missing set-cookie header")?
+        .to_str()
+        .context("invalid set-cookie header")?;
+    let cookie = header_value
+        .split(';')
+        .next()
+        .context("set-cookie missing cookie value")?
+        .to_string();
+    Ok(cookie)
+}
+
+fn ensure_status(response: &hyper::Response<Body>, expected: StatusCode) -> Result<()> {
+    if response.status() == expected {
+        Ok(())
+    } else {
+        Err(anyhow!(
+            "unexpected status: got {}, expected {}",
+            response.status(),
+            expected
+        ))
+    }
+}

backend/tests/common/mod.rs

@@ -6,23 +6,25 @@ use std::time::Duration;
 use anyhow::{anyhow, ensure, Context, Result};
 use async_trait::async_trait;
 use axum::body::Body;
-use axum::http::{Method, Request, StatusCode};
+use axum::http::{header, Method, Request, StatusCode};
 use axum::Router;
 use backend::auth::jwt::JwtService;
 use backend::config::AppConfig;
 use backend::db::{self, PgPool};
-use backend::models::{Job, NewUser};
+use backend::models::{Job, NewUser, NewUserMembership, Tenant};
 use backend::routes;
 use backend::state::AppState;
 use backend::storage::ObjectStorage;
 use diesel::connection::SimpleConnection;
 use diesel::prelude::*;
+use diesel::OptionalExtension;
 use diesel::PgConnection;
 use diesel_migrations::{embed_migrations, EmbeddedMigrations, MigrationHarness};
 use http_body_util::BodyExt;
 use once_cell::sync::Lazy;
 use rand::rngs::OsRng;
-use serde::Serialize;
+use serde::{Deserialize, Serialize};
+use serde_json;
 use tokio::sync::Mutex;
 use tower::util::ServiceExt;
 use uuid::Uuid;
@@ -138,6 +140,7 @@ impl TestApp {
             s3_bucket: "test-bucket".to_string(),
             quickwit_endpoint: None,
             quickwit_index: None,
+            default_tenant_slug: "admin".to_string(),
         };
 
         let pool = db::init_pool_with_size(&config.database_url, config.database_max_pool_size)?;
@@ -149,16 +152,20 @@ impl TestApp {
         let state = AppState::new(pool.clone(), config, storage_for_state, jwt);
         let router = routes::create_router(state.clone());
 
-        Ok(Self {
+        let app = Self {
             state,
             router,
             storage,
-        })
+        };
+
+        app.ensure_default_tenant().await?;
+
+        Ok(app)
     }
 
     pub async fn cleanup(&self) -> Result<()> {
         let pool = self.state.pool.clone();
-        tokio::task::spawn_blocking(move || -> Result<()> {
+        let _ = tokio::task::spawn_blocking(move || -> Result<()> {
             let mut conn = pool
                 .get()
                 .map_err(|err| anyhow!("failed to get cleanup connection: {err}"))?;
@@ -166,7 +173,10 @@ impl TestApp {
             Ok(())
         })
         .await
-        .context("cleanup task panicked")?
+        .context("cleanup task panicked")?;
+
+        self.ensure_default_tenant().await?;
+        Ok(())
     }
 
     #[allow(dead_code)]
@@ -174,27 +184,111 @@ impl TestApp {
         self.storage.clone()
     }
 
+    #[allow(dead_code)]
+    pub async fn storage_key_for(&self, key: &str) -> Result<String> {
+        let tenant = self
+            .state
+            .tenants
+            .get_by_slug(&self.state.config.default_tenant_slug)
+            .map_err(|err| anyhow!("default tenant not found: {:?}", err))?;
+        let root = tenant
+            .storage_root
+            .clone()
+            .ok_or_else(|| anyhow!("default tenant missing storage root"))?;
+        Ok(format!("{}{}", root, key))
+    }
+
     pub async fn insert_user(&self, username: &str, password: &str, role: &str) -> Result<Uuid> {
         let username = username.to_string();
         let password = password.to_string();
         let role = role.to_string();
+        let tenant_id = self
+            .state
+            .tenants
+            .tenant_id_for_slug(&self.state.config.default_tenant_slug)
+            .map_err(|err| anyhow!("default tenant not found: {:?}", err))?;
         self.with_conn(move |conn| {
             let password_hash = hash_password(&password)?;
             let user = NewUser {
                 id: Uuid::new_v4(),
                 username,
                 password_hash,
-                role,
             };
             diesel::insert_into(backend::schema::users::table)
                 .values(&user)
                 .execute(conn)
                 .context("failed to insert user")?;
+
+            let membership = NewUserMembership {
+                id: Uuid::new_v4(),
+                user_id: user.id,
+                tenant_id,
+                role,
+            };
+
+            diesel::insert_into(backend::schema::user_memberships::table)
+                .values(&membership)
+                .execute(conn)
+                .context("failed to insert user membership")?;
             Ok(user.id)
         })
         .await
     }
 
+    async fn ensure_default_tenant(&self) -> Result<Uuid> {
+        let slug_value = self.state.config.default_tenant_slug.clone();
+        let quickwit_enabled = self.state.config.quickwit_endpoint.is_some();
+        self.with_conn(move |conn| {
+            use backend::schema::tenants::dsl as tenants_dsl;
+
+            let existing = tenants_dsl::tenants
+                .filter(tenants_dsl::slug.eq(&slug_value))
+                .first::<Tenant>(conn)
+                .optional()
+                .context("failed to load default tenant")?;
+
+            let tenant_id = if let Some(current) = existing {
+                let desired_root = current
+                    .storage_root
+                    .clone()
+                    .filter(|root| root.ends_with('/'))
+                    .unwrap_or_else(|| format!("test-tenants/{}/", current.id));
+
+                if current.storage_root.as_deref() != Some(desired_root.as_str()) {
+                    diesel::update(tenants_dsl::tenants.filter(tenants_dsl::id.eq(current.id)))
+                        .set(tenants_dsl::storage_root.eq(Some(desired_root)))
+                        .execute(conn)
+                        .context("failed to update default tenant storage root")?;
+                }
+
+                current.id
+            } else {
+                let new_id = Uuid::new_v4();
+                let root = format!("test-tenants/{}/", new_id);
+                let quickwit_value = if quickwit_enabled {
+                    Some(format!("documents-{}", new_id))
+                } else {
+                    None
+                };
+
+                diesel::insert_into(tenants_dsl::tenants)
+                    .values((
+                        tenants_dsl::id.eq(new_id),
+                        tenants_dsl::slug.eq(&slug_value),
+                        tenants_dsl::storage_root.eq(Some(root)),
+                        tenants_dsl::quickwit_index.eq(quickwit_value),
+                    ))
+                    .execute(conn)
+                    .context("failed to insert default tenant")?;
+
+                new_id
+            };
+
+            Ok(tenant_id)
+        })
+        .await
+    }
+
     pub async fn login_token(&self, username: &str, password: &str) -> Result<String> {
         #[derive(Serialize)]
         struct LoginPayload<'a> {
@@ -217,11 +311,57 @@ impl TestApp {
         );
 
         let body = body_to_vec(response.into_body()).await?;
-        #[derive(serde::Deserialize)]
+        #[derive(Deserialize)]
         struct LoginResponse {
             access_token: String,
         }
-        let parsed: LoginResponse = serde_json::from_slice(&body)?;
+
+        if let Ok(parsed) = serde_json::from_slice::<LoginResponse>(&body) {
+            return Ok(parsed.access_token);
+        }
+
+        #[derive(Deserialize)]
+        struct TenantSummary {
+            tenant_id: Uuid,
+            _slug: String,
+        }
+
+        #[derive(Deserialize)]
+        struct TenantSelectionResponse {
+            access_token: String,
+            tenants: Vec<TenantSummary>,
+        }
+
+        let selection: TenantSelectionResponse = serde_json::from_slice(&body)?;
+        ensure!(
+            !selection.tenants.is_empty(),
+            "login returned no tenant options",
+        );
+
+        #[derive(Serialize)]
+        struct SelectTenantPayload {
+            tenant_id: Uuid,
+        }
+
+        let target_tenant = selection.tenants[0].tenant_id;
+        let select_response = self
+            .post_json(
+                "/api/auth/select-tenant",
+                &SelectTenantPayload {
+                    tenant_id: target_tenant,
+                },
+                Some(&selection.access_token),
+            )
+            .await?;
+
+        ensure!(
+            select_response.status() == StatusCode::OK,
+            "tenant selection failed with status {}",
+            select_response.status()
+        );
+
+        let select_body = body_to_vec(select_response.into_body()).await?;
+        let parsed: LoginResponse = serde_json::from_slice(&select_body)?;
         Ok(parsed.access_token)
     }
 
@@ -256,6 +396,16 @@ impl TestApp {
         path: &str,
         payload: &T,
         token: Option<&str>,
+    ) -> Result<hyper::Response<Body>> {
+        self.post_json_with_cookie(path, payload, token, None).await
+    }
+
+    pub async fn post_json_with_cookie<T: Serialize + ?Sized>(
+        &self,
+        path: &str,
+        payload: &T,
+        token: Option<&str>,
+        cookie: Option<&str>,
     ) -> Result<hyper::Response<Body>> {
         let body = serde_json::to_vec(payload)?;
         let mut builder = Request::builder()
@@ -265,6 +415,9 @@ impl TestApp {
         if let Some(token) = token {
             builder = builder.header("authorization", format!("Bearer {token}"));
         }
+        if let Some(cookie) = cookie {
+            builder = builder.header(header::COOKIE, cookie);
+        }
         let request = builder.body(Body::from(body))?;
         Ok(self
             .router
@@ -338,6 +491,60 @@ impl TestApp {
         data: &[u8],
         folder_id: Option<Uuid>,
         token: &str,
+    ) -> Result<hyper::Response<Body>> {
+        let extras = UploadExtras::empty();
+        self.upload_document_with_extras(
+            path,
+            filename,
+            content_type,
+            data,
+            folder_id,
+            extras,
+            token,
+        )
+        .await
+    }
+
+    pub async fn upload_document_with_options(
+        &self,
+        path: &str,
+        filename: &str,
+        content_type: &str,
+        data: &[u8],
+        folder_id: Option<Uuid>,
+        title: Option<&str>,
+        metadata_json: Option<&str>,
+        token: &str,
+    ) -> Result<hyper::Response<Body>> {
+        let extras = UploadExtras {
+            title,
+            metadata_json,
+            tag_ids_json: None,
+            correspondents_json: None,
+            issued_at: None,
+            skip_existing: false,
+        };
+        self.upload_document_with_extras(
+            path,
+            filename,
+            content_type,
+            data,
+            folder_id,
+            extras,
+            token,
+        )
+        .await
+    }
+
+    pub async fn upload_document_with_extras(
+        &self,
+        path: &str,
+        filename: &str,
+        content_type: &str,
+        data: &[u8],
+        folder_id: Option<Uuid>,
+        extras: UploadExtras<'_>,
+        token: &str,
     ) -> Result<hyper::Response<Body>> {
         let boundary = format!("boundary-{}", Uuid::new_v4());
         let mut body = Vec::new();
@@ -360,6 +567,46 @@ impl TestApp {
             body.extend(b"\r\n");
         }
 
+        if let Some(title_value) = extras.title {
+            body.extend(format!("--{boundary}\r\n").as_bytes());
+            body.extend(b"Content-Disposition: form-data; name=\"title\"\r\n\r\n");
+            body.extend(title_value.as_bytes());
+            body.extend(b"\r\n");
+        }
+
+        if let Some(metadata_value) = extras.metadata_json {
+            body.extend(format!("--{boundary}\r\n").as_bytes());
+            body.extend(b"Content-Disposition: form-data; name=\"metadata\"\r\n\r\n");
+            body.extend(metadata_value.as_bytes());
+            body.extend(b"\r\n");
+        }
+
+        if let Some(tag_ids_value) = extras.tag_ids_json {
+            body.extend(format!("--{boundary}\r\n").as_bytes());
+            body.extend(b"Content-Disposition: form-data; name=\"tag_ids\"\r\n\r\n");
+            body.extend(tag_ids_value.as_bytes());
+            body.extend(b"\r\n");
+        }
+
+        if let Some(correspondents_value) = extras.correspondents_json {
+            body.extend(format!("--{boundary}\r\n").as_bytes());
+            body.extend(b"Content-Disposition: form-data; name=\"correspondents\"\r\n\r\n");
+            body.extend(correspondents_value.as_bytes());
+            body.extend(b"\r\n");
+        }
+
+        if let Some(issued_at_value) = extras.issued_at {
+            body.extend(format!("--{boundary}\r\n").as_bytes());
+            body.extend(b"Content-Disposition: form-data; name=\"issued_at\"\r\n\r\n");
+            body.extend(issued_at_value.as_bytes());
+            body.extend(b"\r\n");
+        }
+
+        if extras.skip_existing {
+            body.extend(format!("--{boundary}\r\n").as_bytes());
+            body.extend(b"Content-Disposition: form-data; name=\"skip_existing\"\r\n\r\ntrue\r\n");
+        }
+
         body.extend(format!("--{boundary}--\r\n").as_bytes());
 
         let builder = Request::builder()
@@ -380,7 +627,7 @@ impl TestApp {
             .expect("infallible response"))
     }
 
-    async fn with_conn<F, T>(&self, f: F) -> Result<T>
+    pub async fn with_conn<F, T>(&self, f: F) -> Result<T>
     where
         F: FnOnce(&mut PgConnection) -> Result<T> + Send + 'static,
         T: Send + 'static,
@@ -397,6 +644,28 @@ impl TestApp {
     }
 }
 
+pub struct UploadExtras<'a> {
+    pub title: Option<&'a str>,
+    pub metadata_json: Option<&'a str>,
+    pub tag_ids_json: Option<&'a str>,
+    pub correspondents_json: Option<&'a str>,
+    pub issued_at: Option<&'a str>,
+    pub skip_existing: bool,
+}
+
+impl<'a> UploadExtras<'a> {
+    pub fn empty() -> Self {
+        Self {
+            title: None,
+            metadata_json: None,
+            tag_ids_json: None,
+            correspondents_json: None,
+            issued_at: None,
+            skip_existing: false,
+        }
+    }
+}
+
 pub async fn acquire_db_lock() -> tokio::sync::MutexGuard<'static, ()> {
     DB_LOCK.lock().await
 }
@@ -426,13 +695,29 @@ async fn prepare_database(pool: &PgPool) -> Result<()> {
 
 fn truncate_all(conn: &mut PgConnection) -> Result<()> {
     conn.batch_execute(
-        "TRUNCATE TABLE document_tags, document_versions, documents, folders, tags, users RESTART IDENTITY CASCADE;",
+        "TRUNCATE TABLE \
+            document_asset_objects, \
+            document_assets, \
+            document_correspondents, \
+            correspondents, \
+            document_tags, \
+            document_versions, \
+            documents, \
+            folders, \
+            jobs, \
+            refresh_tokens, \
+            tags, \
+            webdav_tokens, \
+            user_memberships, \
+            users, \
+            tenants \
+        RESTART IDENTITY CASCADE;",
     )
     .context("failed to truncate tables")?;
     Ok(())
 }
 
-fn hash_password(password: &str) -> Result<String> {
+pub fn hash_password(password: &str) -> Result<String> {
     use argon2::password_hash::{PasswordHasher, SaltString};
     use argon2::Argon2;
 

backend/tests/correspondents_flow.rs

@@ -0,0 +1,276 @@
+mod common;
+
+use anyhow::Result;
+use common::{acquire_db_lock, body_to_vec, TestApp};
+use serde::Deserialize;
+use serde_json::json;
+use uuid::Uuid;
+
+#[derive(Deserialize)]
+struct DocumentDetail {
+    document: DocumentSummary,
+}
+
+#[derive(Deserialize)]
+struct DocumentSummary {
+    id: Uuid,
+    title: String,
+    #[serde(default)]
+    correspondents: Vec<DocumentCorrespondentSummary>,
+}
+
+#[derive(Deserialize)]
+struct DocumentCorrespondentSummary {
+    id: Uuid,
+    name: String,
+}
+
+#[derive(Deserialize)]
+struct CorrespondentSummary {
+    id: Uuid,
+}
+
+#[derive(Deserialize)]
+struct BulkCorrespondentResult {
+    assigned: usize,
+    removed: usize,
+}
+
+struct TestContext {
+    app: TestApp,
+    token: String,
+    document_ids: Vec<Uuid>,
+    sender_id: Uuid,
+    receiver_id: Uuid,
+}
+
+impl TestContext {
+    const SENDER_NAME: &'static str = "Acme Corp";
+    const RECEIVER_NAME: &'static str = "Bank Ltd";
+
+    async fn new(prefix: &str) -> Result<Self> {
+        let app = TestApp::new().await?;
+        let username = format!("{prefix}_user");
+        let password = format!("{prefix}_pw");
+        app.insert_user(&username, &password, "admin").await?;
+        let token = app.login_token(&username, &password).await?;
+
+        let first_id =
+            upload_document(&app, &token, &format!("{prefix}-one.txt"), b"letter one").await?;
+        let second_id =
+            upload_document(&app, &token, &format!("{prefix}-two.txt"), b"letter two").await?;
+        let sender_id = create_correspondent(&app, &token, Self::SENDER_NAME).await?;
+        let receiver_id = create_correspondent(&app, &token, Self::RECEIVER_NAME).await?;
+
+        Ok(Self {
+            app,
+            token,
+            document_ids: vec![first_id, second_id],
+            sender_id,
+            receiver_id,
+        })
+    }
+
+    async fn assign(&self, correspondent_ids: &[Uuid]) -> Result<BulkCorrespondentResult> {
+        self.assign_with_action(correspondent_ids, None).await
+    }
+
+    async fn assign_with_action(
+        &self,
+        correspondent_ids: &[Uuid],
+        action: Option<&str>,
+    ) -> Result<BulkCorrespondentResult> {
+        let assignments: Vec<_> = correspondent_ids
+            .iter()
+            .map(|id| json!({ "correspondent_id": id }))
+            .collect();
+
+        let mut payload = json!({
+            "document_ids": self.document_ids,
+            "assignments": assignments,
+        });
+
+        if let Some(action) = action {
+            if let Some(obj) = payload.as_object_mut() {
+                obj.insert("action".to_string(), json!(action));
+            }
+        }
+
+        let response = self
+            .app
+            .post_json(
+                "/api/documents/bulk/correspondents",
+                &payload,
+                Some(&self.token),
+            )
+            .await?;
+        assert!(response.status().is_success());
+        let body = body_to_vec(response.into_body()).await?;
+        Ok(serde_json::from_slice(&body)?)
+    }
+
+    async fn fetch_correspondents(
+        &self,
+        document_id: Uuid,
+    ) -> Result<Vec<DocumentCorrespondentSummary>> {
+        let detail = fetch_document_detail(&self.app, &self.token, document_id).await?;
+        Ok(detail.document.correspondents)
+    }
+
+    async fn create_correspondent(&self, name: &str) -> Result<Uuid> {
+        create_correspondent(&self.app, &self.token, name).await
+    }
+}
+
+#[tokio::test]
+async fn bulk_assign_correspondents_adds_new_links() -> Result<()> {
+    let _lock = acquire_db_lock().await;
+    let context = TestContext::new("corresp_add").await?;
+
+    let result = context
+        .assign(&[context.sender_id, context.receiver_id])
+        .await?;
+    assert_eq!(result.assigned, 4);
+    assert_eq!(result.removed, 0);
+
+    for doc_id in &context.document_ids {
+        let correspondents = context.fetch_correspondents(*doc_id).await?;
+        let names: Vec<_> = correspondents
+            .iter()
+            .map(|entry| entry.name.as_str())
+            .collect();
+        assert!(names.contains(&TestContext::SENDER_NAME));
+        assert!(names.contains(&TestContext::RECEIVER_NAME));
+        let ids: Vec<_> = correspondents.iter().map(|entry| entry.id).collect();
+        assert!(ids.contains(&context.sender_id));
+        assert!(ids.contains(&context.receiver_id));
+    }
+
+    context.app.cleanup().await?;
+    Ok(())
+}
+
+#[tokio::test]
+async fn bulk_assign_correspondents_is_idempotent() -> Result<()> {
+    let _lock = acquire_db_lock().await;
+    let context = TestContext::new("corresp_idempotent").await?;
+
+    context
+        .assign(&[context.sender_id, context.receiver_id])
+        .await?;
+    let repeat = context
+        .assign(&[context.sender_id, context.receiver_id])
+        .await?;
+    assert_eq!(repeat.assigned, 0);
+    assert_eq!(repeat.removed, 0);
+
+    context.app.cleanup().await?;
+    Ok(())
+}
+
+#[tokio::test]
+async fn bulk_remove_correspondents_detaches_links() -> Result<()> {
+    let _lock = acquire_db_lock().await;
+    let context = TestContext::new("corresp_remove").await?;
+
+    context
+        .assign(&[context.sender_id, context.receiver_id])
+        .await?;
+    let removal = context
+        .assign_with_action(&[context.sender_id], Some("remove"))
+        .await?;
+    assert_eq!(removal.assigned, 0);
+    assert_eq!(removal.removed, 2);
+
+    for doc_id in &context.document_ids {
+        let correspondents = context.fetch_correspondents(*doc_id).await?;
+        assert_eq!(correspondents.len(), 1);
+        let entry = &correspondents[0];
+        assert_eq!(entry.id, context.receiver_id);
+        assert_eq!(entry.name, TestContext::RECEIVER_NAME);
+    }
+
+    context.app.cleanup().await?;
+    Ok(())
+}
+
+#[tokio::test]
+async fn bulk_assign_correspondents_appends_new_entries() -> Result<()> {
+    let _lock = acquire_db_lock().await;
+    let context = TestContext::new("corresp_append").await?;
+
+    context
+        .assign(&[context.sender_id, context.receiver_id])
+        .await?;
+    context
+        .assign_with_action(&[context.sender_id], Some("remove"))
+        .await?;
+
+    let charlie_name = "Charlie";
+    let charlie_id = context.create_correspondent(charlie_name).await?;
+    let add_result = context.assign(&[charlie_id]).await?;
+    assert_eq!(add_result.assigned, 2);
+    assert_eq!(add_result.removed, 0);
+
+    for doc_id in &context.document_ids {
+        let correspondents = context.fetch_correspondents(*doc_id).await?;
+        assert_eq!(correspondents.len(), 2);
+        let ids: Vec<_> = correspondents.iter().map(|entry| entry.id).collect();
+        assert!(ids.contains(&context.receiver_id));
+        assert!(ids.contains(&charlie_id));
+        let names: Vec<_> = correspondents
+            .iter()
+            .map(|entry| entry.name.as_str())
+            .collect();
+        assert!(names.contains(&TestContext::RECEIVER_NAME));
+        assert!(names.contains(&charlie_name));
+    }
+
+    context.app.cleanup().await?;
+    Ok(())
+}
+
+async fn upload_document(
+    app: &TestApp,
+    token: &str,
+    filename: &str,
+    contents: &[u8],
+) -> Result<Uuid> {
+    let response = app
+        .upload_document(
+            "/api/documents",
+            filename,
+            "text/plain",
+            contents,
+            None,
+            token,
+        )
+        .await?;
+    assert!(response.status().is_success());
+    let body = body_to_vec(response.into_body()).await?;
+    let detail: DocumentDetail = serde_json::from_slice(&body)?;
+    Ok(detail.document.id)
+}
+
+async fn create_correspondent(app: &TestApp, token: &str, name: &str) -> Result<Uuid> {
+    let response = app
+        .post_json("/api/correspondents", &json!({ "name": name }), Some(token))
+        .await?;
+    assert!(response.status().is_success());
+    let body = body_to_vec(response.into_body()).await?;
+    let summary: CorrespondentSummary = serde_json::from_slice(&body)?;
+    Ok(summary.id)
+}
+
+async fn fetch_document_detail(
+    app: &TestApp,
+    token: &str,
+    document_id: Uuid,
+) -> Result<DocumentDetail> {
+    let response = app
+        .get(&format!("/api/documents/{document_id}"), Some(token))
+        .await?;
+    assert!(response.status().is_success());
+    let body = body_to_vec(response.into_body()).await?;
+    Ok(serde_json::from_slice(&body)?)
+}