license

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+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
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+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -26,6 +26,15 @@ The compose service uses tmpfs storage, giving each test run a clean database.
 - `ocrmypdf` (optional but recommended): Used by the OCR worker to extract text from PDFs when no embedded text layer is available. Ensure it is installed and available on the worker hosts if OCR is desired.
 - Quickwit (optional): The Quickwit indexer is used to ingest extracted text for search. Set `QUICKWIT_ENDPOINT` and `QUICKWIT_INDEX` in the environment when running workers if you want indexing jobs to run. The local compose file starts a Quickwit instance on `http://localhost:7280` and seeds the `documents` index automatically.
 
+## Configuration
+
+The backend reads its settings from environment variables (see `backend/.env` for local defaults). In particular:
+
+- `DATABASE_URL` – connection string for the primary Postgres database (required).
+- `DATABASE_MAX_POOL_SIZE` – optional override for the r2d2 connection pool size. Defaults to `2`; increase it in staging/production to match expected concurrency.
+
+On startup each binary logs the effective configuration with secrets redacted (for example, the database password is masked). This makes it easier to confirm the runtime settings in staging without exposing credentials.
+
 ## Running Migrations in Kubernetes
 
 The backend container image ships the `diesel` CLI, so schema migrations can be executed as a short-lived Job (or Helm hook) before rolling out new pods. Example manifest:

backend/Cargo.lock

@@ -605,11 +605,13 @@ dependencies = [
  "aws-sdk-s3",
  "axum",
  "axum-extra",
+ "base64 0.21.7",
  "bytes",
  "chrono",
  "diesel",
  "diesel_migrations",
  "dotenv",
+ "futures-util",
  "hex",
  "http-body-util",
  "hyper 1.7.0",
@@ -619,6 +621,7 @@ dependencies = [
  "once_cell",
  "pdfium-render",
  "percent-encoding",
+ "quick-xml",
  "rand 0.8.5",
  "reqwest",
  "serde",
@@ -628,9 +631,10 @@ dependencies = [
  "thiserror 1.0.69",
  "tokio",
  "tower 0.4.13",
- "tower-http 0.5.2",
+ "tower-http",
  "tracing",
  "tracing-subscriber",
+ "url",
  "uuid",
 ]
 
@@ -1269,6 +1273,23 @@ version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "05f29059c0c2090612e8d742178b0580d2dc940c837851ad723096f87af6663e"
 
+[[package]]
+name = "futures-io"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e5c1b78ca4aae1ac06c48a526a655760685149f0d465d21f37abfe57ce075c6"
+
+[[package]]
+name = "futures-macro"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "162ee34ebcb7c64a8abebc059ce0fee27c2262618d7b60ed8faf72fef13c3650"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "futures-sink"
 version = "0.3.31"
@@ -1288,9 +1309,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9fa08315bb612088cc391249efdc3bc77536f16c91f6cf495e6fbe85b20a4a81"
 dependencies = [
  "futures-core",
+ "futures-io",
+ "futures-macro",
+ "futures-sink",
  "futures-task",
+ "memchr",
  "pin-project-lite",
  "pin-utils",
+ "slab",
 ]
 
 [[package]]
@@ -2354,6 +2380,15 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "quick-xml"
+version = "0.32.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d3a6e5838b60e0e8fa7a43f22ade549a37d61f8bdbe636d0d7816191de969c2"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "quinn"
 version = "0.11.9"
@@ -2547,6 +2582,7 @@ dependencies = [
  "base64 0.22.1",
  "bytes",
  "futures-core",
+ "futures-util",
  "http 1.3.1",
  "http-body 1.0.1",
  "http-body-util",
@@ -2566,12 +2602,14 @@ dependencies = [
  "sync_wrapper",
  "tokio",
  "tokio-rustls 0.26.4",
+ "tokio-util",
  "tower 0.5.2",
- "tower-http 0.6.6",
+ "tower-http",
  "tower-service",
  "url",
  "wasm-bindgen",
  "wasm-bindgen-futures",
+ "wasm-streams",
  "web-sys",
  "webpki-roots",
 ]
@@ -3320,23 +3358,6 @@ dependencies = [
  "tracing",
 ]
 
-[[package]]
-name = "tower-http"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e9cd434a998747dd2c4276bc96ee2e0c7a2eadf3cae88e52be55a05fa9053f5"
-dependencies = [
- "bitflags",
- "bytes",
- "http 1.3.1",
- "http-body 1.0.1",
- "http-body-util",
- "pin-project-lite",
- "tower-layer",
- "tower-service",
- "tracing",
-]
-
 [[package]]
 name = "tower-http"
 version = "0.6.6"
@@ -3353,6 +3374,7 @@ dependencies = [
  "tower 0.5.2",
  "tower-layer",
  "tower-service",
+ "tracing",
 ]
 
 [[package]]
@@ -3642,6 +3664,19 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "wasm-streams"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15053d8d85c7eccdbefef60f06769760a563c7f0a9d6902a13d35c7800b0ad65"
+dependencies = [
+ "futures-util",
+ "js-sys",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+]
+
 [[package]]
 name = "web-sys"
 version = "0.3.81"

backend/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2021"
 axum = { version = "0.7", features = ["multipart"] }
 tokio = { version = "1", features = ["full"] }
 tower = { version = "0.4", features = ["make", "util"] }
-tower-http = { version = "0.5", features = ["cors", "trace"] }
+tower-http = { version = "0.6", features = ["cors", "trace"] }
 axum-extra = { version = "0.9", features = ["typed-header"] }
 
 # Database
@@ -38,8 +38,12 @@ image = { version = "0.25", default-features = false, features = ["png", "jpeg"]
 pdfium-render = "0.8"
 mime_guess = "2.0"
 tempfile = "3.10"
-reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls", "stream"] }
 percent-encoding = "2.3"
+base64 = "0.21"
+quick-xml = "0.32"
+futures-util = "0.3"
+url = "2.5"
 
 # 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
+RUN cargo build --release --bin backend --bin worker --bin webdav
 RUN cargo install diesel_cli --no-default-features --features postgres
 
 FROM debian:trixie-slim AS runtime
@@ -52,6 +52,7 @@ 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 /usr/local/cargo/bin/diesel /usr/local/bin/diesel
 COPY migrations ./migrations
 COPY diesel.toml ./

backend/migrations/202503120001_drop_asset_dimensions/down.sql

@@ -0,0 +1,13 @@
+-- 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

@@ -0,0 +1,15 @@
+-- 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

@@ -0,0 +1,17 @@
+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

@@ -0,0 +1,21 @@
+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

@@ -0,0 +1,5 @@
+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

@@ -0,0 +1,27 @@
+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

@@ -0,0 +1,2 @@
+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

@@ -0,0 +1,13 @@
+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

@@ -0,0 +1,16 @@
+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

@@ -0,0 +1,18 @@
+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

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

backend/migrations/202503240003_add_metadata_to_document_versions/up.sql

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

backend/migrations/202503240004_drop_folder_path_cache/down.sql

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

backend/migrations/202503240004_drop_folder_path_cache/up.sql

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

backend/src/bin/maintenance.rs

@@ -32,7 +32,14 @@ async fn main() -> Result<()> {
 
 async fn delete_all_assets() -> Result<()> {
     let config = AppConfig::from_env()?;
-    let pool = db::init_pool(&config.database_url)?;
+    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());

backend/src/bin/webdav.rs

@@ -0,0 +1,60 @@
+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::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();
+    init_tracing();
+
+    let config = AppConfig::from_env()?;
+    tracing::info!(
+        component = "webdav",
+        database_url = %config.redacted_database_url(),
+        pool_size = config.database_max_pool_size,
+        server_host = %config.server_host,
+        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 = {
+        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);
+
+    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

@@ -14,7 +14,15 @@ async fn main() -> anyhow::Result<()> {
     init_tracing();
 
     let config = AppConfig::from_env()?;
-    let pool = db::init_pool(&config.database_url)?;
+    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)?;

backend/src/config.rs

@@ -1,12 +1,18 @@
 use std::env;
 
 use anyhow::{Context, Result};
+use url::Url;
+
+use crate::db::DEFAULT_MAX_POOL_SIZE;
 
 #[derive(Clone, Debug)]
 pub struct AppConfig {
     pub database_url: String,
+    pub database_max_pool_size: u32,
     pub server_host: String,
     pub server_port: u16,
+    pub webdav_host: String,
+    pub webdav_port: u16,
     pub jwt_secret: String,
     pub jwt_issuer: String,
     pub jwt_audience: String,
@@ -29,11 +35,20 @@ pub struct AppConfig {
 impl AppConfig {
     pub fn from_env() -> Result<Self> {
         let database_url = env::var("DATABASE_URL").context("DATABASE_URL must be set")?;
+        let database_max_pool_size = env::var("DATABASE_MAX_POOL_SIZE")
+            .ok()
+            .and_then(|value| value.parse().ok())
+            .unwrap_or(DEFAULT_MAX_POOL_SIZE);
         let server_host = env::var("SERVER_HOST").unwrap_or_else(|_| "127.0.0.1".to_string());
         let server_port = env::var("SERVER_PORT")
             .unwrap_or_else(|_| "3000".to_string())
             .parse()
             .context("SERVER_PORT must be a valid u16")?;
+        let webdav_host = env::var("WEBDAV_HOST").unwrap_or_else(|_| server_host.clone());
+        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 =
@@ -67,8 +82,11 @@ impl AppConfig {
 
         Ok(Self {
             database_url,
+            database_max_pool_size,
             server_host,
             server_port,
+            webdav_host,
+            webdav_port,
             jwt_secret,
             jwt_issuer,
             jwt_audience,
@@ -88,4 +106,42 @@ impl AppConfig {
             quickwit_index,
         })
     }
+
+    pub fn redacted_database_url(&self) -> String {
+        redact_database_url(&self.database_url)
+    }
+}
+
+fn redact_database_url(raw: &str) -> String {
+    match Url::parse(raw) {
+        Ok(mut parsed) => {
+            let _ = parsed.set_password(Some("*****"));
+            parsed.to_string()
+        }
+        Err(_) => "***".to_string(),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::redact_database_url;
+
+    #[test]
+    fn redacts_password_in_database_url() {
+        let redacted = redact_database_url("postgres://user:secret@localhost/db");
+        assert!(redacted.contains("postgres://user:*****@"));
+        assert!(!redacted.contains("secret"));
+    }
+
+    #[test]
+    fn handles_url_without_password() {
+        let redacted = redact_database_url("postgres://localhost/db");
+        assert_eq!(redacted, "postgres://localhost/db");
+    }
+
+    #[test]
+    fn falls_back_when_parse_fails() {
+        let redacted = redact_database_url("not a url");
+        assert_eq!(redacted, "***");
+    }
 }

backend/src/db.rs

@@ -5,10 +5,17 @@ use diesel::r2d2::{ConnectionManager, Pool};
 
 pub type PgPool = Pool<ConnectionManager<PgConnection>>;
 
+pub const DEFAULT_MAX_POOL_SIZE: u32 = 2;
+
 pub fn init_pool(database_url: &str) -> anyhow::Result<PgPool> {
+    init_pool_with_size(database_url, DEFAULT_MAX_POOL_SIZE)
+}
+
+pub fn init_pool_with_size(database_url: &str, max_size: u32) -> anyhow::Result<PgPool> {
     let manager = ConnectionManager::<PgConnection>::new(database_url);
+    let pool_size = max_size.max(1);
     let pool = Pool::builder()
-        .max_size(16)
+        .max_size(pool_size)
         .connection_timeout(Duration::from_secs(10))
         .build(manager)?;
     Ok(pool)

backend/src/main.rs

@@ -19,7 +19,17 @@ async fn main() -> anyhow::Result<()> {
     init_tracing();
 
     let config = AppConfig::from_env()?;
-    let pool = db::init_pool(&config.database_url)?;
+    tracing::info!(
+        component = "api",
+        database_url = %config.redacted_database_url(),
+        pool_size = config.database_max_pool_size,
+        server_host = %config.server_host,
+        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)?;

backend/src/models.rs

@@ -30,7 +30,6 @@ pub struct Folder {
     pub id: Uuid,
     pub name: String,
     pub parent_id: Option<Uuid>,
-    pub path_cache: Option<String>,
     pub created_at: NaiveDateTime,
     pub updated_at: NaiveDateTime,
 }
@@ -41,7 +40,6 @@ pub struct NewFolder {
     pub id: Uuid,
     pub name: String,
     pub parent_id: Option<Uuid>,
-    pub path_cache: Option<String>,
 }
 
 #[derive(Debug, Clone, Queryable, Identifiable, Associations)]
@@ -53,13 +51,13 @@ pub struct Document {
     pub original_name: String,
     pub content_type: Option<String>,
     pub folder_id: Option<Uuid>,
-    pub current_version: i32,
     pub uploaded_at: NaiveDateTime,
     pub updated_at: NaiveDateTime,
     pub deleted_at: Option<NaiveDateTime>,
     pub metadata: serde_json::Value,
     pub issued_at: Option<NaiveDateTime>,
     pub title: String,
+    pub current_version_id: Uuid,
 }
 
 #[derive(Debug, Insertable)]
@@ -70,7 +68,7 @@ pub struct NewDocument {
     pub original_name: String,
     pub content_type: Option<String>,
     pub folder_id: Option<Uuid>,
-    pub current_version: i32,
+    pub current_version_id: Uuid,
     pub metadata: serde_json::Value,
     pub issued_at: Option<NaiveDateTime>,
     pub title: String,
@@ -88,6 +86,7 @@ pub struct DocumentVersion {
     pub checksum: String,
     pub created_at: NaiveDateTime,
     pub operations_summary: serde_json::Value,
+    pub metadata: serde_json::Value,
 }
 
 #[derive(Debug, Insertable)]
@@ -100,6 +99,7 @@ pub struct NewDocumentVersion {
     pub size_bytes: i64,
     pub checksum: String,
     pub operations_summary: serde_json::Value,
+    pub metadata: serde_json::Value,
 }
 
 #[derive(Debug, Clone, Queryable, Identifiable, Associations)]
@@ -111,8 +111,6 @@ pub struct DocumentAsset {
     pub asset_type: String,
     pub s3_key: String,
     pub mime_type: String,
-    pub width: Option<i32>,
-    pub height: Option<i32>,
     pub metadata: serde_json::Value,
     pub created_at: NaiveDateTime,
 }
@@ -125,8 +123,6 @@ pub struct NewDocumentAsset {
     pub asset_type: String,
     pub s3_key: String,
     pub mime_type: String,
-    pub width: Option<i32>,
-    pub height: Option<i32>,
     pub metadata: serde_json::Value,
 }
 
@@ -192,6 +188,46 @@ pub struct NewDocumentTag {
     pub assigned_by: Option<Uuid>,
 }
 
+#[derive(Debug, Clone, Queryable, Identifiable)]
+#[diesel(table_name = correspondents)]
+pub struct Correspondent {
+    pub id: Uuid,
+    pub name: String,
+    pub metadata: serde_json::Value,
+    pub created_at: NaiveDateTime,
+    pub updated_at: NaiveDateTime,
+}
+
+#[derive(Debug, Insertable)]
+#[diesel(table_name = correspondents)]
+pub struct NewCorrespondent {
+    pub id: Uuid,
+    pub name: String,
+    pub metadata: serde_json::Value,
+}
+
+#[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))]
+pub struct DocumentCorrespondent {
+    pub document_id: Uuid,
+    pub correspondent_id: Uuid,
+    pub role: String,
+    pub assigned_at: NaiveDateTime,
+    pub assigned_by: Option<Uuid>,
+}
+
+#[derive(Debug, Insertable)]
+#[diesel(table_name = document_correspondents)]
+pub struct NewDocumentCorrespondent {
+    pub document_id: Uuid,
+    pub correspondent_id: Uuid,
+    pub role: String,
+    pub assigned_by: Option<Uuid>,
+}
+
 #[derive(Debug, Clone, Queryable, Identifiable, Associations)]
 #[diesel(table_name = refresh_tokens)]
 #[diesel(belongs_to(User))]

backend/src/routes/correspondents.rs

@@ -0,0 +1,259 @@
+use std::collections::{BTreeMap, HashMap};
+
+use axum::{
+    extract::{Path, State},
+    http::StatusCode,
+    response::IntoResponse,
+    Json,
+};
+use chrono::Utc;
+use diesel::{dsl::count_star, prelude::*, result::DatabaseErrorKind, PgConnection};
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use uuid::Uuid;
+
+use crate::{
+    error::{AppError, AppResult},
+    models::{Correspondent, NewCorrespondent},
+    schema::{correspondents, document_correspondents},
+    state::AppState,
+};
+
+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)]
+pub struct CorrespondentSummary {
+    pub id: Uuid,
+    pub name: String,
+    pub metadata: Value,
+    pub created_at: String,
+    pub updated_at: String,
+    pub usage: CorrespondentUsage,
+}
+
+#[derive(Deserialize)]
+pub struct CreateCorrespondentRequest {
+    pub name: String,
+    #[serde(default)]
+    pub metadata: Option<Value>,
+}
+
+#[derive(Deserialize)]
+pub struct UpdateCorrespondentRequest {
+    pub name: Option<String>,
+    pub metadata: Option<Value>,
+}
+
+#[derive(AsChangeset, Default)]
+#[diesel(table_name = correspondents)]
+struct CorrespondentChangeset<'a> {
+    name: Option<&'a str>,
+    metadata: Option<&'a Value>,
+}
+
+pub async fn list_correspondents(
+    State(state): State<AppState>,
+) -> AppResult<Json<Vec<CorrespondentSummary>>> {
+    let mut conn = state.db()?;
+
+    let correspondents_list: Vec<Correspondent> = correspondents::table
+        .order(correspondents::name.asc())
+        .load(&mut conn)?;
+
+    let usage_rows: Vec<(Uuid, String, i64)> = document_correspondents::table
+        .group_by((
+            document_correspondents::correspondent_id,
+            document_correspondents::role,
+        ))
+        .select((
+            document_correspondents::correspondent_id,
+            document_correspondents::role,
+            count_star(),
+        ))
+        .load(&mut conn)?;
+
+    let mut usage_map: HashMap<Uuid, BTreeMap<String, i64>> = HashMap::new();
+    for (correspondent_id, role, count) in usage_rows {
+        usage_map
+            .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();
+        response.push(build_summary(correspondent, role_counts));
+    }
+
+    Ok(Json(response))
+}
+
+pub async fn create_correspondent(
+    State(state): State<AppState>,
+    Json(payload): Json<CreateCorrespondentRequest>,
+) -> AppResult<Json<CorrespondentSummary>> {
+    let name = payload.name.trim();
+    if name.is_empty() {
+        return Err(AppError::bad_request("name must not be empty"));
+    }
+
+    let metadata_value = normalize_metadata(payload.metadata);
+    let new_id = Uuid::new_v4();
+    let new_correspondent = NewCorrespondent {
+        id: new_id,
+        name: name.to_string(),
+        metadata: metadata_value,
+    };
+
+    let mut conn = state.db()?;
+    match diesel::insert_into(correspondents::table)
+        .values(&new_correspondent)
+        .execute(&mut conn)
+    {
+        Ok(_) => {}
+        Err(diesel::result::Error::DatabaseError(DatabaseErrorKind::UniqueViolation, _)) => {
+            return Err(AppError::bad_request("correspondent name already exists"));
+        }
+        Err(err) => return Err(AppError::from(err)),
+    }
+
+    let correspondent: Correspondent = correspondents::table.find(new_id).first(&mut conn)?;
+    Ok(Json(build_summary(correspondent, BTreeMap::new())))
+}
+
+pub async fn update_correspondent(
+    State(state): State<AppState>,
+    Path(correspondent_id): Path<Uuid>,
+    Json(payload): Json<UpdateCorrespondentRequest>,
+) -> AppResult<Json<CorrespondentSummary>> {
+    let mut conn = state.db()?;
+    let existing: Correspondent = correspondents::table
+        .find(correspondent_id)
+        .first(&mut conn)?;
+
+    let mut new_name: Option<String> = None;
+    if let Some(ref candidate) = payload.name {
+        let trimmed = candidate.trim();
+        if trimmed.is_empty() {
+            return Err(AppError::bad_request("name must not be empty"));
+        }
+        if trimmed != existing.name {
+            let duplicate = correspondents::table
+                .filter(correspondents::name.eq(trimmed))
+                .filter(correspondents::id.ne(correspondent_id))
+                .first::<Correspondent>(&mut conn)
+                .optional()?;
+            if duplicate.is_some() {
+                return Err(AppError::bad_request("correspondent name already exists"));
+            }
+            new_name = Some(trimmed.to_string());
+        }
+    }
+
+    let mut new_metadata: Option<Value> = None;
+    if let Some(metadata) = payload.metadata.clone() {
+        let candidate = normalize_metadata(Some(metadata));
+        if candidate != existing.metadata {
+            new_metadata = Some(candidate);
+        }
+    }
+
+    if new_name.is_none() && new_metadata.is_none() {
+        let usage = load_usage_for_correspondent(&mut conn, correspondent_id)?;
+        return Ok(Json(build_summary(existing.clone(), usage)));
+    }
+
+    let mut changeset = CorrespondentChangeset::default();
+    if let Some(ref name) = new_name {
+        changeset.name = Some(name.as_str());
+    }
+    if let Some(ref metadata) = new_metadata {
+        changeset.metadata = Some(metadata);
+    }
+
+    let now = Utc::now().naive_utc();
+    diesel::update(correspondents::table.find(correspondent_id))
+        .set((&changeset, correspondents::updated_at.eq(now)))
+        .execute(&mut conn)?;
+
+    let updated: Correspondent = correspondents::table
+        .find(correspondent_id)
+        .first(&mut conn)?;
+    let usage = load_usage_for_correspondent(&mut conn, correspondent_id)?;
+    Ok(Json(build_summary(updated, usage)))
+}
+
+pub async fn delete_correspondent(
+    State(state): State<AppState>,
+    Path(correspondent_id): Path<Uuid>,
+) -> AppResult<impl IntoResponse> {
+    let mut conn = state.db()?;
+
+    let usage: i64 = document_correspondents::table
+        .filter(document_correspondents::correspondent_id.eq(correspondent_id))
+        .select(count_star())
+        .first(&mut conn)?;
+
+    if usage > 0 {
+        return Err(AppError::bad_request(
+            "cannot delete correspondent that is still assigned to documents",
+        ));
+    }
+
+    let deleted =
+        diesel::delete(correspondents::table.find(correspondent_id)).execute(&mut conn)?;
+    if deleted == 0 {
+        return Err(AppError::not_found());
+    }
+    Ok(StatusCode::NO_CONTENT)
+}
+
+fn build_summary(
+    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 {
+            total,
+            by_role: role_counts,
+        },
+    }
+}
+
+fn normalize_metadata(input: Option<Value>) -> Value {
+    match input {
+        None | Some(Value::Null) => Value::Object(Default::default()),
+        Some(value) => value,
+    }
+}
+
+fn load_usage_for_correspondent(
+    conn: &mut PgConnection,
+    correspondent_id: Uuid,
+) -> AppResult<BTreeMap<String, i64>> {
+    let rows: Vec<(String, i64)> = document_correspondents::table
+        .filter(document_correspondents::correspondent_id.eq(correspondent_id))
+        .group_by(document_correspondents::role)
+        .select((document_correspondents::role, count_star()))
+        .load(conn)?;
+
+    let mut map = BTreeMap::new();
+    for (role, count) in rows {
+        map.insert(role, count);
+    }
+    Ok(map)
+}

backend/src/routes/folders.rs

@@ -1,17 +1,13 @@
-use anyhow::anyhow;
 use axum::{
     extract::{Json, Path, Query, State},
     http::StatusCode,
 };
 use diesel::{dsl::exists, prelude::*, PgConnection};
-use reqwest::Client;
 use serde::{Deserialize, Serialize};
-use serde_json::{json, Value};
-use std::collections::{HashMap, HashSet};
 use uuid::Uuid;
 
 use crate::models::{Document, Folder, NewFolder};
-use crate::schema::{document_tags, documents, folders};
+use crate::schema::{documents, folders};
 use crate::state::AppState;
 use crate::{
     auth::AuthenticatedUser,
@@ -19,12 +15,10 @@ use crate::{
 };
 
 use super::documents::{
-    load_primary_thumbnails, load_tags_for_documents, to_document_response, to_iso,
-    DocumentResponse,
+    load_correspondents_for_documents, load_primary_assets, load_tags_for_documents,
+    to_document_response, to_iso, DocumentResponse,
 };
 
-const QUICKWIT_MAX_HITS: usize = 200;
-
 #[derive(Deserialize)]
 pub struct CreateFolderRequest {
     pub name: String,
@@ -39,7 +33,9 @@ pub struct EnsureFolderPathRequest {
 
 #[derive(Deserialize)]
 pub struct UpdateFolderRequest {
-    pub parent_id: Option<Uuid>,
+    #[serde(default)]
+    pub parent_id: Option<Option<Uuid>>,
+    pub name: Option<String>,
 }
 
 #[derive(Serialize)]
@@ -55,9 +51,13 @@ pub struct FolderContentsResponse {
 }
 
 #[derive(Deserialize)]
-pub struct DocumentSearchQuery {
-    pub query: Option<String>,
-    pub tags: Option<String>,
+pub struct FolderContentsQuery {
+    #[serde(default = "default_include_documents")]
+    pub include_documents: bool,
+}
+
+const fn default_include_documents() -> bool {
+    true
 }
 
 #[derive(Serialize)]
@@ -65,7 +65,6 @@ pub struct FolderInfo {
     pub id: Uuid,
     pub name: String,
     pub parent_id: Option<Uuid>,
-    pub path_cache: Option<String>,
     pub created_at: String,
     pub updated_at: String,
 }
@@ -107,12 +106,10 @@ pub async fn ensure_folder_path(
             let folder = if let Some(folder) = existing {
                 folder
             } else {
-                let path_cache = build_path_cache(conn, current_parent, name)?;
                 let new_folder = NewFolder {
                     id: Uuid::new_v4(),
                     name: name.to_string(),
                     parent_id: current_parent,
-                    path_cache,
                 };
 
                 diesel::insert_into(folders::table)
@@ -143,13 +140,11 @@ pub async fn create_folder(
     }
 
     let mut conn = state.db()?;
-    let path_cache = build_path_cache(&mut conn, payload.parent_id, &payload.name)?;
 
     let new_folder = NewFolder {
         id: Uuid::new_v4(),
         name: payload.name.trim().to_string(),
         parent_id: payload.parent_id,
-        path_cache,
     };
 
     diesel::insert_into(folders::table)
@@ -165,6 +160,7 @@ pub async fn create_folder(
 pub async fn list_folder_contents(
     State(state): State<AppState>,
     Path(folder_identifier): Path<String>,
+    Query(query): Query<FolderContentsQuery>,
     user: AuthenticatedUser,
 ) -> AppResult<Json<FolderContentsResponse>> {
     let mut conn = state.db()?;
@@ -198,39 +194,48 @@ pub async fn list_folder_contents(
     };
     let subfolders = child_folders.into_iter().map(folder_to_info).collect();
 
-    let docs_query = documents::table
-        .filter(documents::deleted_at.is_null())
-        .order(documents::uploaded_at.desc());
+    let documents = if query.include_documents {
+        let docs_query = documents::table
+            .filter(documents::deleted_at.is_null())
+            .order(documents::uploaded_at.desc());
 
-    let docs: Vec<Document> = if let Some(current_folder) = folder_id {
-        docs_query
-            .filter(documents::folder_id.eq(current_folder))
-            .load(&mut conn)?
+        let docs: Vec<Document> = if let Some(current_folder) = folder_id {
+            docs_query
+                .filter(documents::folder_id.eq(current_folder))
+                .load(&mut conn)?
+        } else {
+            docs_query
+                .filter(documents::folder_id.is_null())
+                .load(&mut conn)?
+        };
+
+        let doc_ids: Vec<Uuid> = docs.iter().map(|doc| doc.id).collect();
+        let tags_map = load_tags_for_documents(&mut conn, &doc_ids)?;
+        let mut correspondents_map = load_correspondents_for_documents(&mut conn, &doc_ids)?;
+        drop(conn);
+
+        let primary_versions = load_primary_assets(&state, &docs).await?;
+
+        let mut documents = Vec::with_capacity(doc_ids.len());
+        for doc in docs {
+            let tags = tags_map.get(&doc.id).cloned();
+            let correspondents = correspondents_map.remove(&doc.id).unwrap_or_default();
+            let current_version = primary_versions.get(&doc.id).cloned();
+            documents.push(to_document_response(
+                &state,
+                user.user_id,
+                doc,
+                tags,
+                correspondents,
+                current_version,
+            )?);
+        }
+
+        documents
     } else {
-        docs_query
-            .filter(documents::folder_id.is_null())
-            .load(&mut conn)?
+        Vec::new()
     };
 
-    let doc_ids: Vec<Uuid> = docs.iter().map(|doc| doc.id).collect();
-    let tags_map = load_tags_for_documents(&mut conn, &doc_ids)?;
-    drop(conn);
-
-    let thumbnails = load_primary_thumbnails(&state, &docs).await?;
-
-    let mut documents = Vec::with_capacity(doc_ids.len());
-    for doc in docs {
-        let tags = tags_map.get(&doc.id).cloned();
-        let thumbnail = thumbnails.get(&doc.id).cloned();
-        documents.push(to_document_response(
-            &state,
-            user.user_id,
-            doc,
-            tags,
-            thumbnail,
-        )?);
-    }
-
     Ok(Json(FolderContentsResponse {
         folder,
         subfolders,
@@ -238,318 +243,6 @@ pub async fn list_folder_contents(
     }))
 }
 
-pub async fn search_documents(
-    State(state): State<AppState>,
-    Path(folder_identifier): Path<String>,
-    Query(params): Query<DocumentSearchQuery>,
-    user: AuthenticatedUser,
-) -> AppResult<Json<Vec<DocumentResponse>>> {
-    let mut conn = state.db()?;
-
-    let folder_id = if folder_identifier.eq_ignore_ascii_case("root") {
-        None
-    } else {
-        Some(
-            Uuid::parse_str(&folder_identifier)
-                .map_err(|_| AppError::bad_request("folder identifier must be 'root' or a UUID"))?,
-        )
-    };
-
-    let mut docs_query = documents::table
-        .filter(documents::deleted_at.is_null())
-        .into_boxed();
-
-    if let Some(folder_id) = folder_id {
-        let descendant_ids = gather_descendant_folder_ids(&mut conn, folder_id)?;
-        docs_query = docs_query.filter(documents::folder_id.eq_any(descendant_ids));
-    }
-
-    let mut filter_ids: Option<HashSet<Uuid>> = None;
-    let mut quickwit_order: Option<Vec<Uuid>> = None;
-
-    if let Some(query) = params
-        .query
-        .as_ref()
-        .map(|s| s.trim())
-        .filter(|s| !s.is_empty())
-    {
-        let endpoint = state
-            .config
-            .quickwit_endpoint
-            .as_ref()
-            .ok_or_else(|| AppError::internal("quickwit endpoint not configured"))?;
-        let index = state
-            .config
-            .quickwit_index
-            .as_ref()
-            .ok_or_else(|| AppError::internal("quickwit index not configured"))?;
-
-        let ids = quickwit_search(endpoint, index, query)
-            .await
-            .map_err(|err| AppError::internal(format!("quickwit search failed: {err}")))?;
-
-        if ids.is_empty() {
-            return Ok(Json(vec![]));
-        }
-
-        quickwit_order = Some(ids.clone());
-        let set: HashSet<Uuid> = ids.into_iter().collect();
-        filter_ids = Some(match &filter_ids {
-            Some(existing) => existing.intersection(&set).copied().collect(),
-            None => set,
-        });
-    }
-
-    if let Some(tags_param) = params
-        .tags
-        .as_ref()
-        .map(|s| s.trim())
-        .filter(|s| !s.is_empty())
-    {
-        let tag_ids: Result<Vec<Uuid>, _> = tags_param
-            .split(',')
-            .map(|s| Uuid::parse_str(s.trim()))
-            .collect();
-
-        if let Ok(ids) = tag_ids {
-            if !ids.is_empty() {
-                let mut doc_id_set: Option<HashSet<Uuid>> = None;
-                for tag_id in &ids {
-                    let docs_for_tag: Vec<Uuid> = document_tags::table
-                        .filter(document_tags::tag_id.eq(*tag_id))
-                        .select(document_tags::document_id)
-                        .load(&mut conn)?;
-                    let docs_set: HashSet<Uuid> = docs_for_tag.into_iter().collect();
-                    doc_id_set = Some(match doc_id_set {
-                        Some(existing) => existing.intersection(&docs_set).cloned().collect(),
-                        None => docs_set,
-                    });
-
-                    if let Some(ref set) = doc_id_set {
-                        if set.is_empty() {
-                            break;
-                        }
-                    }
-                }
-
-                let matching_doc_ids: HashSet<Uuid> = doc_id_set.unwrap_or_default();
-
-                if matching_doc_ids.is_empty() {
-                    return Ok(Json(vec![]));
-                }
-
-                let new_filter = match &filter_ids {
-                    Some(existing) => existing.intersection(&matching_doc_ids).copied().collect(),
-                    None => matching_doc_ids.clone(),
-                };
-
-                filter_ids = Some(new_filter);
-            }
-        }
-    }
-
-    if let Some(ref set) = filter_ids {
-        if set.is_empty() {
-            return Ok(Json(vec![]));
-        }
-
-        let ids_vec: Vec<Uuid> = set.iter().copied().collect();
-        docs_query = docs_query.filter(documents::id.eq_any(ids_vec));
-    }
-
-    let docs: Vec<Document> = if let Some(order_ids) = quickwit_order.as_ref() {
-        let relevant_ids: Vec<Uuid> = if let Some(filter_set) = filter_ids.as_ref() {
-            order_ids
-                .iter()
-                .copied()
-                .filter(|id| filter_set.contains(id))
-                .collect()
-        } else {
-            order_ids.clone()
-        };
-
-        if relevant_ids.is_empty() {
-            return Ok(Json(vec![]));
-        }
-
-        let fetched: Vec<Document> = docs_query.load(&mut conn)?;
-        let mut by_id: HashMap<Uuid, Document> =
-            fetched.into_iter().map(|doc| (doc.id, doc)).collect();
-
-        let mut ordered = Vec::with_capacity(by_id.len());
-        for id in relevant_ids {
-            if let Some(doc) = by_id.remove(&id) {
-                ordered.push(doc);
-            }
-        }
-
-        if !by_id.is_empty() {
-            let mut remaining: Vec<Document> = by_id.into_values().collect();
-            remaining.sort_by(|a, b| b.uploaded_at.cmp(&a.uploaded_at));
-            ordered.extend(remaining);
-        }
-
-        ordered
-    } else {
-        docs_query
-            .order(documents::uploaded_at.desc())
-            .load(&mut conn)?
-    };
-
-    let doc_ids: Vec<Uuid> = docs.iter().map(|doc| doc.id).collect();
-    let tags_map = load_tags_for_documents(&mut conn, &doc_ids)?;
-    drop(conn);
-
-    let thumbnails = load_primary_thumbnails(&state, &docs).await?;
-    let mut response = Vec::with_capacity(doc_ids.len());
-    for doc in docs {
-        let tags = tags_map.get(&doc.id).cloned();
-        let thumbnail = thumbnails.get(&doc.id).cloned();
-        response.push(to_document_response(
-            &state,
-            user.user_id,
-            doc,
-            tags,
-            thumbnail,
-        )?);
-    }
-
-    Ok(Json(response))
-}
-
-async fn quickwit_search(endpoint: &str, index: &str, query: &str) -> anyhow::Result<Vec<Uuid>> {
-    let quickwit_query = match build_quickwit_query(query) {
-        Some(q) => q,
-        None => 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,
-    });
-
-    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();
-        return Err(anyhow!(
-            "quickwit search failed with status {status}: {body}"
-        ));
-    }
-
-    let data: QuickwitSearchResponse = response.json().await?;
-    let mut seen = HashSet::new();
-    let mut doc_ids = Vec::new();
-
-    for hit in data.hits {
-        if let Some(doc_id) = extract_document_id(&hit) {
-            if seen.insert(doc_id) {
-                doc_ids.push(doc_id);
-            }
-        }
-    }
-
-    Ok(doc_ids)
-}
-
-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 "))
-}
-
-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
-}
-
-#[derive(Deserialize)]
-struct QuickwitSearchResponse {
-    #[serde(default)]
-    hits: Vec<Value>,
-}
-
-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
-}
-
-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)
-}
-
-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
-}
-
 pub async fn delete_folder(
     State(state): State<AppState>,
     Path(folder_id): Path<Uuid>,
@@ -591,50 +284,69 @@ pub async fn delete_folder(
     Ok(StatusCode::NO_CONTENT)
 }
 
-pub async fn update_folder_parent(
+pub async fn update_folder(
     State(state): State<AppState>,
     Path(folder_id): Path<Uuid>,
     Json(payload): Json<UpdateFolderRequest>,
 ) -> AppResult<StatusCode> {
-    if payload.parent_id == Some(folder_id) {
-        return Err(AppError::bad_request("folder cannot be its own parent"));
-    }
-
     let mut conn = state.db()?;
 
     conn.transaction::<(), AppError, _>(|conn| {
         let folder: Folder = folders::table.find(folder_id).first(conn)?;
-        let current_parent = folder.parent_id;
-        let next_parent = payload.parent_id;
 
-        if current_parent == next_parent {
-            return Ok(());
-        }
+        let mut next_parent = folder.parent_id;
+        let mut parent_changed = false;
 
-        if let Some(parent_id) = next_parent {
-            let _parent: Folder = folders::table.find(parent_id).first(conn)?;
-        }
-
-        if let Some(parent_id) = next_parent {
-            let descendant_ids = gather_descendant_folder_ids(conn, folder_id)?;
-            if descendant_ids.contains(&parent_id) {
-                return Err(AppError::bad_request(
-                    "cannot move folder into itself or a descendant",
-                ));
+        if let Some(parent_request) = payload.parent_id {
+            if parent_request == Some(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.find(parent_id).first(conn)?;
+
+                let descendant_ids = gather_descendant_folder_ids(conn, folder_id)?;
+                if descendant_ids.contains(&parent_id) {
+                    return Err(AppError::bad_request(
+                        "cannot move folder into itself or a descendant",
+                    ));
+                }
+            }
+
+            parent_changed = parent_request != folder.parent_id;
+            next_parent = parent_request;
+        }
+
+        let mut new_name = folder.name.clone();
+        let mut name_changed = false;
+
+        if let Some(name) = payload.name {
+            let trimmed = name.trim();
+            if trimmed.is_empty() {
+                return Err(AppError::bad_request("name must not be empty"));
+            }
+
+            if trimmed != folder.name {
+                new_name = trimmed.to_string();
+                name_changed = true;
+            }
+        }
+
+        if !parent_changed && !name_changed {
+            return Ok(());
         }
 
         let conflict = if let Some(parent_id) = next_parent {
             folders::table
                 .filter(folders::parent_id.eq(Some(parent_id)))
-                .filter(folders::name.eq(&folder.name))
+                .filter(folders::name.eq(&new_name))
                 .filter(folders::id.ne(folder_id))
                 .first::<Folder>(conn)
                 .optional()?
         } else {
             folders::table
                 .filter(folders::parent_id.is_null())
-                .filter(folders::name.eq(&folder.name))
+                .filter(folders::name.eq(&new_name))
                 .filter(folders::id.ne(folder_id))
                 .first::<Folder>(conn)
                 .optional()?
@@ -646,54 +358,33 @@ pub async fn update_folder_parent(
             ));
         }
 
-        let new_path = build_path_cache(conn, next_parent, &folder.name)?;
-
         diesel::update(folders::table.find(folder_id))
             .set((
                 folders::parent_id.eq(next_parent),
-                folders::path_cache.eq(new_path),
+                folders::name.eq(&new_name),
             ))
             .execute(conn)?;
 
-        refresh_descendant_paths(conn, folder_id)?;
-
         Ok(())
     })?;
 
     Ok(StatusCode::NO_CONTENT)
 }
 
-fn build_path_cache(
-    conn: &mut PgConnection,
-    parent_id: Option<Uuid>,
-    name: &str,
-) -> AppResult<Option<String>> {
-    let path = if let Some(parent_id) = parent_id {
-        let parent: Folder = folders::table.find(parent_id).first(conn)?;
-        let base = parent
-            .path_cache
-            .unwrap_or_else(|| "/".to_string())
-            .trim_end_matches('/')
-            .to_string();
-        format!("{}/{}", base, name)
-    } else {
-        format!("/{}", name)
-    };
-    Ok(Some(path))
-}
-
 fn folder_to_info(folder: Folder) -> FolderInfo {
     FolderInfo {
         id: folder.id,
         name: folder.name,
         parent_id: folder.parent_id,
-        path_cache: folder.path_cache,
         created_at: to_iso(folder.created_at),
         updated_at: to_iso(folder.updated_at),
     }
 }
 
-fn gather_descendant_folder_ids(conn: &mut PgConnection, folder_id: Uuid) -> AppResult<Vec<Uuid>> {
+pub(super) fn gather_descendant_folder_ids(
+    conn: &mut PgConnection,
+    folder_id: Uuid,
+) -> AppResult<Vec<Uuid>> {
     let mut ids = vec![folder_id];
     let mut queue = vec![folder_id];
 
@@ -708,19 +399,3 @@ fn gather_descendant_folder_ids(conn: &mut PgConnection, folder_id: Uuid) -> App
 
     Ok(ids)
 }
-
-fn refresh_descendant_paths(conn: &mut PgConnection, parent_id: Uuid) -> AppResult<()> {
-    let children: Vec<Folder> = folders::table
-        .filter(folders::parent_id.eq(Some(parent_id)))
-        .load(conn)?;
-
-    for child in children {
-        let path_cache = build_path_cache(conn, Some(parent_id), &child.name)?;
-        diesel::update(folders::table.find(child.id))
-            .set(folders::path_cache.eq(path_cache))
-            .execute(conn)?;
-        refresh_descendant_paths(conn, child.id)?;
-    }
-
-    Ok(())
-}

backend/src/routes/mod.rs

@@ -10,10 +10,12 @@ use tower_http::cors::{AllowOrigin, CorsLayer};
 use crate::{auth::AuthenticatedUser, state::AppState};
 
 pub mod auth;
+pub mod correspondents;
 pub mod documents;
 pub mod folders;
 pub mod health;
 pub mod tags;
+pub mod webdav;
 
 pub fn create_router(state: AppState) -> Router<()> {
     let cors = if let Some(origins) = state.config.cors_allowed_origin.as_ref() {
@@ -58,6 +60,10 @@ pub fn create_router(state: AppState) -> Router<()> {
         .route("/reanalyze", post(documents::reanalyze_all_documents))
         .route("/bulk/move", post(documents::bulk_move_documents))
         .route("/bulk/tags", post(documents::bulk_update_tags))
+        .route(
+            "/bulk/correspondents",
+            post(documents::bulk_assign_correspondents),
+        )
         .route(
             "/bulk/reanalyze",
             post(documents::reanalyze_selected_documents),
@@ -69,13 +75,22 @@ pub fn create_router(state: AppState) -> Router<()> {
                 .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/tags", post(documents::assign_tags))
-        .route("/:id/tags/:tag_id", delete(documents::remove_tag));
+        .route("/:id/tags/:tag_id", delete(documents::remove_tag))
+        .route(
+            "/:id/correspondents",
+            post(documents::assign_correspondents),
+        )
+        .route(
+            "/:id/correspondents/:correspondent_id",
+            delete(documents::remove_correspondent),
+        );
 
     let download_routes =
         Router::new().route("/download/:token", get(documents::download_with_token));
@@ -85,27 +100,38 @@ pub fn create_router(state: AppState) -> Router<()> {
         .route("/path", post(folders::ensure_folder_path))
         .route(
             "/:id",
-            delete(folders::delete_folder).patch(folders::update_folder_parent),
+            delete(folders::delete_folder).patch(folders::update_folder),
         )
-        .route("/:id/contents", get(folders::list_folder_contents))
-        .route("/:id/documents", get(folders::search_documents));
+        .route("/:id/contents", get(folders::list_folder_contents));
 
     let tags_routes = Router::new()
         .route("/", get(tags::list_tags).post(tags::create_tag))
-        .route("/:id", patch(tags::update_tag));
+        .route("/:id", patch(tags::update_tag).delete(tags::delete_tag));
+
+    let correspondents_routes = Router::new()
+        .route(
+            "/",
+            get(correspondents::list_correspondents).post(correspondents::create_correspondent),
+        )
+        .route(
+            "/:id",
+            patch(correspondents::update_correspondent)
+                .delete(correspondents::delete_correspondent),
+        );
 
     let protected_state = state.clone();
     let protected_routes = Router::new()
         .nest("/api/documents", documents_routes)
         .nest("/api/folders", folders_routes)
         .nest("/api/tags", tags_routes)
-        .route("/api/health", get(health::health_check))
+        .nest("/api/correspondents", correspondents_routes)
         .layer(middleware::from_extractor_with_state::<AuthenticatedUser, _>(protected_state));
 
     Router::new()
         .merge(download_routes)
-        .nest("/api/auth", auth_routes)
         .merge(protected_routes)
+        .nest("/api/auth", auth_routes)
+        .route("/api/health", get(health::health_check))
         .with_state(state)
         .layer(cors)
         .layer(DefaultBodyLimit::max(1024 * 1024 * 512))

backend/src/routes/tags.rs

@@ -1,6 +1,7 @@
 use crate::utils::json::{classify_nullable, NullableValue};
 use axum::{
     extract::{Path, State},
+    http::StatusCode,
     Json,
 };
 use diesel::{dsl::count_star, prelude::*};
@@ -111,7 +112,16 @@ pub async fn update_tag(
     if matches!(label_class, NullableValue::Omitted)
         && matches!(color_class, NullableValue::Omitted)
     {
-        return Err(AppError::bad_request("no changes supplied"));
+        let usage_count: i64 = document_tags::table
+            .filter(document_tags::tag_id.eq(tag_id))
+            .select(count_star())
+            .first(&mut conn)?;
+        return Ok(Json(TagCatalogEntry {
+            id: existing.id,
+            label: existing.label.clone(),
+            color: existing.color.clone(),
+            usage_count,
+        }));
     }
 
     let mut new_label: Option<String> = None;
@@ -162,7 +172,16 @@ pub async fn update_tag(
     }
 
     if !label_changed && !color_changed {
-        return Err(AppError::bad_request("no changes supplied"));
+        let usage_count: i64 = document_tags::table
+            .filter(document_tags::tag_id.eq(tag_id))
+            .select(count_star())
+            .first(&mut conn)?;
+        return Ok(Json(TagCatalogEntry {
+            id: existing.id,
+            label: existing.label.clone(),
+            color: existing.color.clone(),
+            usage_count,
+        }));
     }
 
     let changeset = UpdateTagChangeset {
@@ -189,3 +208,28 @@ pub async fn update_tag(
         usage_count,
     }))
 }
+
+pub async fn delete_tag(
+    State(state): State<AppState>,
+    Path(tag_id): Path<Uuid>,
+) -> AppResult<impl axum::response::IntoResponse> {
+    let mut conn = state.db()?;
+
+    let usage: i64 = document_tags::table
+        .filter(document_tags::tag_id.eq(tag_id))
+        .select(count_star())
+        .first(&mut conn)?;
+
+    if usage > 0 {
+        return Err(AppError::bad_request(
+            "cannot delete tag that is still assigned to documents",
+        ));
+    }
+
+    let deleted = diesel::delete(tags::table.find(tag_id)).execute(&mut conn)?;
+    if deleted == 0 {
+        return Err(AppError::not_found());
+    }
+
+    Ok(StatusCode::NO_CONTENT)
+}

backend/src/routes/webdav/mod.rs

@@ -0,0 +1,808 @@
+use std::time::Duration;
+
+use axum::body::Body;
+use axum::extract::State;
+use axum::http::{header, HeaderMap, Method, StatusCode};
+use axum::response::Response;
+use axum::Router;
+use base64::engine::general_purpose::STANDARD as BASE64;
+use base64::Engine;
+use diesel::prelude::*;
+use diesel::PgConnection;
+use futures_util::StreamExt;
+use percent_encoding::{percent_decode_str, utf8_percent_encode, NON_ALPHANUMERIC};
+use quick_xml::events::{BytesDecl, BytesEnd, BytesStart, BytesText, Event};
+use quick_xml::Writer;
+use uuid::Uuid;
+
+use crate::auth::password;
+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,
+};
+use crate::state::AppState;
+
+const REALM: &str = "Papercrate WebDAV";
+const DOWNLOAD_URL_TTL_SECONDS: u64 = 300;
+
+#[derive(Clone, Debug)]
+struct WebDavUser {
+    _user_id: Uuid,
+    _username: String,
+}
+
+pub fn create_router() -> Router<AppState> {
+    Router::new().fallback(webdav_entrypoint)
+}
+
+async fn webdav_entrypoint(
+    State(state): State<AppState>,
+    req: axum::http::Request<axum::body::Body>,
+) -> Result<Response, AppError> {
+    let method = req.method().clone();
+    let headers = req.headers().clone();
+    let path = req.uri().path().trim_start_matches('/').to_string();
+
+    tracing::debug!(method = %method, %path, "webdav entrypoint" );
+
+    match method {
+        ref m if m == Method::OPTIONS => Ok(handle_options()),
+        ref m if m == Method::GET => handle_get_or_head(&state, &path, headers, Method::GET).await,
+        ref m if m == Method::HEAD => {
+            handle_get_or_head(&state, &path, headers, Method::HEAD).await
+        }
+        _ => {
+            if method.as_str() == "PROPFIND" {
+                handle_propfind(&state, &path, headers).await
+            } else {
+                Ok(method_not_allowed())
+            }
+        }
+    }
+}
+
+async fn handle_propfind(
+    state: &AppState,
+    path: &str,
+    headers: HeaderMap,
+) -> Result<Response, AppError> {
+    let _user = match authenticate(state, &headers)? {
+        Some(user) => user,
+        None => return Ok(unauthorized_response()),
+    };
+
+    let depth = match parse_depth(&headers) {
+        Ok(value) => value,
+        Err(response) => return Ok(response),
+    };
+
+    let segments = parse_segments(path)?;
+    let resolution = match resolve_path(state, &segments)? {
+        Some(resolved) => resolved,
+        None => return Ok(not_found_response()),
+    };
+
+    let resources = 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))?;
+            build_resources_for_folder(Some(&folder), &chain, &contents, depth)
+        }
+        ResolvedPath::Document {
+            document,
+            version,
+            chain,
+        } => build_resources_for_document(&chain, &document, &version),
+    };
+
+    let body = render_multistatus(&resources)
+        .map_err(|err| AppError::internal(format!("failed to render WebDAV response: {err}")))?;
+
+    let response = Response::builder()
+        .status(multi_status())
+        .header(header::CONTENT_TYPE, "application/xml; charset=utf-8")
+        .body(Body::from(body))
+        .expect("valid response");
+
+    Ok(response)
+}
+
+async fn handle_get_or_head(
+    state: &AppState,
+    path: &str,
+    headers: HeaderMap,
+    method: Method,
+) -> Result<Response, AppError> {
+    let _user = match authenticate(state, &headers)? {
+        Some(user) => user,
+        None => return Ok(unauthorized_response()),
+    };
+
+    let segments = parse_segments(path)?;
+    let resolution = match resolve_path(state, &segments)? {
+        Some(resolved) => resolved,
+        None => return Ok(not_found_response()),
+    };
+
+    let (document, version, chain) = match resolution {
+        ResolvedPath::Document {
+            document,
+            version,
+            chain,
+        } => (document, version, chain),
+        _ => return Ok(method_not_allowed()),
+    };
+
+    stream_document(state, &document, &version, &chain, headers, method).await
+}
+
+fn handle_options() -> Response {
+    Response::builder()
+        .status(StatusCode::OK)
+        .header("DAV", "1,2")
+        .header(header::ALLOW, "OPTIONS, PROPFIND, GET, HEAD")
+        .header("Accept-Ranges", "bytes")
+        .body(Body::empty())
+        .expect("valid OPTIONS response")
+}
+
+fn method_not_allowed() -> Response {
+    Response::builder()
+        .status(StatusCode::METHOD_NOT_ALLOWED)
+        .body(Body::empty())
+        .expect("valid response")
+}
+
+fn not_found_response() -> Response {
+    Response::builder()
+        .status(StatusCode::NOT_FOUND)
+        .body(Body::empty())
+        .expect("valid response")
+}
+
+fn unauthorized_response() -> Response {
+    Response::builder()
+        .status(StatusCode::UNAUTHORIZED)
+        .header(
+            header::WWW_AUTHENTICATE,
+            format!("Basic realm=\"{REALM}\", charset=\"UTF-8\""),
+        )
+        .body(Body::empty())
+        .expect("valid response")
+}
+
+fn multi_status() -> StatusCode {
+    StatusCode::from_u16(207).expect("valid multi-status")
+}
+
+fn parse_depth(headers: &HeaderMap) -> Result<u8, Response> {
+    match headers.get("Depth") {
+        None => Ok(1),
+        Some(value) => match value.to_str() {
+            Ok("0") => Ok(0),
+            Ok("1") => Ok(1),
+            Ok("infinity") => Err(Response::builder()
+                .status(StatusCode::FORBIDDEN)
+                .body(Body::empty())
+                .expect("valid response")),
+            _ => Err(Response::builder()
+                .status(StatusCode::BAD_REQUEST)
+                .body(Body::empty())
+                .expect("valid response")),
+        },
+    }
+}
+
+fn parse_segments(path: &str) -> AppResult<Vec<String>> {
+    if path.trim_matches('/').is_empty() {
+        return Ok(vec![]);
+    }
+
+    let segments = path
+        .split('/')
+        .filter(|segment| !segment.is_empty())
+        .map(|segment| {
+            percent_decode_str(segment)
+                .decode_utf8()
+                .map(|cow| cow.into_owned())
+                .map_err(|_| AppError::bad_request("invalid UTF-8 in path"))
+        })
+        .collect::<Result<Vec<_>, _>>()?;
+
+    Ok(segments)
+}
+
+fn fetch_folder_contents(
+    state: &AppState,
+    folder_id: Option<Uuid>,
+) -> AppResult<WebDavFolderContents> {
+    let mut conn = state.db()?;
+
+    let folder = match folder_id {
+        Some(id) => Some(folders_dsl::folders.find(id).first::<Folder>(&mut conn)?),
+        None => None,
+    };
+
+    let subfolders: Vec<Folder> = match folder_id {
+        Some(id) => folders_dsl::folders
+            .filter(folders_dsl::parent_id.eq(Some(id)))
+            .order(folders_dsl::name.asc())
+            .load(&mut conn)?,
+        None => folders_dsl::folders
+            .filter(folders_dsl::parent_id.is_null())
+            .order(folders_dsl::name.asc())
+            .load(&mut conn)?,
+    };
+
+    let mut docs_query = documents_dsl::documents
+        .filter(documents_dsl::deleted_at.is_null())
+        .into_boxed();
+
+    docs_query = match folder_id {
+        Some(id) => docs_query.filter(documents_dsl::folder_id.eq(Some(id))),
+        None => docs_query.filter(documents_dsl::folder_id.is_null()),
+    };
+
+    let documents: Vec<Document> = docs_query
+        .order(documents_dsl::uploaded_at.desc())
+        .load(&mut conn)?;
+
+    let version_ids: Vec<Uuid> = documents.iter().map(|doc| doc.current_version_id).collect();
+    let versions: Vec<DocumentVersion> = if version_ids.is_empty() {
+        Vec::new()
+    } else {
+        document_versions_dsl::document_versions
+            .filter(document_versions_dsl::id.eq_any(&version_ids))
+            .load(&mut conn)?
+    };
+
+    let mut version_map = versions
+        .into_iter()
+        .map(|version| (version.id, version))
+        .collect::<std::collections::HashMap<_, _>>();
+
+    let mut entries = Vec::with_capacity(documents.len());
+    for document in documents {
+        if let Some(version) = version_map.remove(&document.current_version_id) {
+            entries.push(DocumentEntry { document, version });
+        }
+    }
+
+    Ok(WebDavFolderContents {
+        _folder: folder,
+        subfolders,
+        documents: entries,
+    })
+}
+
+async fn stream_document(
+    state: &AppState,
+    document: &Document,
+    version: &DocumentVersion,
+    _chain: &[String],
+    headers: HeaderMap,
+    method: Method,
+) -> Result<Response, AppError> {
+    let range_header = headers.get(header::RANGE).cloned();
+
+    let url = state
+        .storage
+        .presign_get_object(
+            &version.s3_key,
+            Duration::from_secs(DOWNLOAD_URL_TTL_SECONDS),
+        )
+        .await
+        .map_err(|err| AppError::internal(format!("failed to presign document download: {err}")))?;
+
+    let client = reqwest::Client::new();
+    let mut request = client.request(method.clone(), url.clone());
+
+    if let Some(range) = range_header.clone() {
+        request = request.header(header::RANGE, range.clone());
+    }
+
+    let upstream = request
+        .send()
+        .await
+        .map_err(|err| AppError::internal(format!("failed to fetch document stream: {err}")))?;
+
+    let status =
+        StatusCode::from_u16(upstream.status().as_u16()).unwrap_or(StatusCode::BAD_GATEWAY);
+
+    if !(status.is_success() || status == StatusCode::PARTIAL_CONTENT) {
+        return Err(AppError::internal(format!(
+            "upstream download returned status {status}"
+        )));
+    }
+
+    let mut builder = Response::builder().status(status);
+
+    if let Some(content_type) = upstream.headers().get(header::CONTENT_TYPE) {
+        builder = builder.header(header::CONTENT_TYPE, content_type);
+    } else if let Some(ref typ) = document.content_type {
+        builder = builder.header(header::CONTENT_TYPE, typ);
+    }
+
+    if let Some(content_length) = upstream.headers().get(header::CONTENT_LENGTH) {
+        builder = builder.header(header::CONTENT_LENGTH, content_length);
+    }
+
+    if let Some(range) = upstream.headers().get(header::CONTENT_RANGE) {
+        builder = builder.header(header::CONTENT_RANGE, range);
+    }
+
+    builder = builder.header("Accept-Ranges", "bytes");
+
+    if let Some(disposition) = content_disposition(&document.filename) {
+        builder = builder.header(header::CONTENT_DISPOSITION, disposition);
+    }
+
+    builder = builder.header(header::ETAG, format!("\"{}\"", version.id));
+
+    if method == Method::HEAD {
+        return builder
+            .body(Body::empty())
+            .map_err(|err| AppError::internal(format!("failed to build response: {err}")));
+    }
+
+    let stream = upstream
+        .bytes_stream()
+        .map(|chunk| chunk.map_err(|err| std::io::Error::new(std::io::ErrorKind::Other, err)));
+    let body = Body::from_stream(stream);
+
+    builder
+        .body(body)
+        .map_err(|err| AppError::internal(format!("failed to build response: {err}")))
+}
+
+fn authenticate(state: &AppState, headers: &HeaderMap) -> Result<Option<WebDavUser>, AppError> {
+    tracing::debug!("webdav authenticate invoked");
+    let authorization = match headers.get(header::AUTHORIZATION) {
+        Some(value) => match value.to_str() {
+            Ok(header) if header.starts_with("Basic ") => {
+                tracing::debug!("authorization header present");
+                &header[6..]
+            }
+            Ok(other) => {
+                tracing::warn!(header = %other, "non-basic authorization header");
+                return Ok(None);
+            }
+            Err(err) => {
+                tracing::warn!(error = %err, "invalid authorization header");
+                return Ok(None);
+            }
+        },
+        None => {
+            tracing::debug!("no authorization header");
+            return Ok(None);
+        }
+    };
+
+    let decoded = match BASE64.decode(authorization) {
+        Ok(bytes) => bytes,
+        Err(err) => {
+            tracing::warn!(error = %err, "failed to decode basic credentials");
+            return Ok(None);
+        }
+    };
+
+    let credential_str = match String::from_utf8(decoded) {
+        Ok(value) => value,
+        Err(err) => {
+            tracing::warn!(error = %err, "invalid utf-8 basic credentials");
+            return Ok(None);
+        }
+    };
+
+    let (username, password) = match credential_str.split_once(':') {
+        Some((username, password)) if !username.is_empty() => (username, password),
+        _ => return Ok(None),
+    };
+
+    tracing::debug!(%username, "attempting webdav login");
+    let mut conn = state.db()?;
+
+    let user: User = match users_dsl::users
+        .filter(users_dsl::username.eq(username))
+        .first(&mut conn)
+    {
+        Ok(user) => user,
+        Err(diesel::result::Error::NotFound) => {
+            tracing::warn!(%username, "webdav user not found");
+            return Ok(None);
+        }
+        Err(err) => return Err(AppError::from(err)),
+    };
+
+    let valid = password::verify_password(password, &user.password_hash)
+        .map_err(|_| AppError::internal("failed to verify password"))?;
+
+    if !valid {
+        tracing::warn!(%username, "webdav password invalid");
+        return Ok(None);
+    }
+
+    tracing::debug!(%username, "webdav login success");
+    Ok(Some(WebDavUser {
+        _user_id: user.id,
+        _username: user.username,
+    }))
+}
+
+fn build_resources_for_folder(
+    folder: Option<&Folder>,
+    chain: &[String],
+    contents: &WebDavFolderContents,
+    depth: u8,
+) -> Vec<DavResource> {
+    let mut resources = Vec::new();
+
+    let display_name = folder
+        .map(|folder| folder.name.clone())
+        .unwrap_or_else(|| "/".to_string());
+
+    let href = build_href(chain, true);
+    let last_modified = folder.map(|folder| format_http_date(folder.updated_at));
+
+    resources.push(DavResource {
+        href,
+        display_name,
+        is_collection: true,
+        content_length: None,
+        content_type: None,
+        last_modified,
+    });
+
+    if depth == 0 {
+        return resources;
+    }
+
+    for subfolder in &contents.subfolders {
+        let mut child_chain = chain.to_vec();
+        child_chain.push(subfolder.name.clone());
+        resources.push(DavResource {
+            href: build_href(&child_chain, true),
+            display_name: subfolder.name.clone(),
+            is_collection: true,
+            content_length: None,
+            content_type: None,
+            last_modified: Some(format_http_date(subfolder.updated_at)),
+        });
+    }
+
+    for entry in &contents.documents {
+        let mut child_chain = chain.to_vec();
+        child_chain.push(entry.document.filename.clone());
+        resources.push(document_to_resource(
+            &child_chain,
+            &entry.document,
+            &entry.version,
+        ));
+    }
+
+    resources
+}
+
+fn build_resources_for_document(
+    chain: &[String],
+    document: &Document,
+    version: &DocumentVersion,
+) -> Vec<DavResource> {
+    vec![document_to_resource(chain, document, version)]
+}
+
+fn document_to_resource(
+    chain: &[String],
+    document: &Document,
+    version: &DocumentVersion,
+) -> DavResource {
+    let href = build_href(chain, false);
+
+    DavResource {
+        href,
+        display_name: document.title.clone(),
+        is_collection: false,
+        content_length: Some(version.size_bytes),
+        content_type: document.content_type.clone(),
+        last_modified: Some(format_http_date(document.updated_at)),
+    }
+}
+
+fn build_href(names: &[String], is_collection: bool) -> String {
+    if names.is_empty() {
+        return "/".to_string();
+    }
+
+    let encoded = names
+        .iter()
+        .map(|name| utf8_percent_encode(name, NON_ALPHANUMERIC).to_string())
+        .collect::<Vec<_>>();
+
+    let mut path = format!("/{}", encoded.join("/"));
+    if is_collection && !path.ends_with('/') {
+        path.push('/');
+    }
+    path
+}
+
+fn render_multistatus(resources: &[DavResource]) -> Result<Vec<u8>, quick_xml::Error> {
+    let mut writer = Writer::new(Vec::new());
+    writer.write_event(Event::Decl(BytesDecl::new("1.0", Some("UTF-8"), None)))?;
+
+    let mut multistatus = BytesStart::new("D:multistatus");
+    multistatus.push_attribute(("xmlns:D", "DAV:"));
+    writer.write_event(Event::Start(multistatus))?;
+
+    for resource in resources {
+        writer.write_event(Event::Start(BytesStart::new("D:response")))?;
+
+        writer.write_event(Event::Start(BytesStart::new("D:href")))?;
+        writer.write_event(Event::Text(BytesText::new(&resource.href)))?;
+        writer.write_event(Event::End(BytesEnd::new("D:href")))?;
+
+        writer.write_event(Event::Start(BytesStart::new("D:propstat")))?;
+        writer.write_event(Event::Start(BytesStart::new("D:prop")))?;
+
+        writer.write_event(Event::Start(BytesStart::new("D:displayname")))?;
+        writer.write_event(Event::Text(BytesText::new(&resource.display_name)))?;
+        writer.write_event(Event::End(BytesEnd::new("D:displayname")))?;
+
+        writer.write_event(Event::Start(BytesStart::new("D:resourcetype")))?;
+        if resource.is_collection {
+            writer.write_event(Event::Empty(BytesStart::new("D:collection")))?;
+        }
+        writer.write_event(Event::End(BytesEnd::new("D:resourcetype")))?;
+
+        if let Some(length) = resource.content_length {
+            writer.write_event(Event::Start(BytesStart::new("D:getcontentlength")))?;
+            writer.write_event(Event::Text(BytesText::new(&length.to_string())))?;
+            writer.write_event(Event::End(BytesEnd::new("D:getcontentlength")))?;
+        }
+
+        if let Some(content_type) = &resource.content_type {
+            writer.write_event(Event::Start(BytesStart::new("D:getcontenttype")))?;
+            writer.write_event(Event::Text(BytesText::new(content_type)))?;
+            writer.write_event(Event::End(BytesEnd::new("D:getcontenttype")))?;
+        }
+
+        if let Some(last_modified) = &resource.last_modified {
+            writer.write_event(Event::Start(BytesStart::new("D:getlastmodified")))?;
+            writer.write_event(Event::Text(BytesText::new(last_modified)))?;
+            writer.write_event(Event::End(BytesEnd::new("D:getlastmodified")))?;
+        }
+
+        writer.write_event(Event::End(BytesEnd::new("D:prop")))?;
+
+        writer.write_event(Event::Start(BytesStart::new("D:status")))?;
+        writer.write_event(Event::Text(BytesText::new("HTTP/1.1 200 OK")))?;
+        writer.write_event(Event::End(BytesEnd::new("D:status")))?;
+
+        writer.write_event(Event::End(BytesEnd::new("D:propstat")))?;
+        writer.write_event(Event::End(BytesEnd::new("D:response")))?;
+    }
+
+    writer.write_event(Event::End(BytesEnd::new("D:multistatus")))?;
+    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>,
+    documents: Vec<DocumentEntry>,
+}
+
+struct DocumentEntry {
+    document: Document,
+    version: DocumentVersion,
+}
+
+struct DavResource {
+    href: String,
+    display_name: String,
+    is_collection: bool,
+    content_length: Option<i64>,
+    content_type: Option<String>,
+    last_modified: Option<String>,
+}
+
+enum ResolvedPath {
+    Root,
+    Folder {
+        folder: Folder,
+        chain: Vec<String>,
+    },
+    Document {
+        document: Document,
+        version: DocumentVersion,
+        chain: Vec<String>,
+    },
+}
+
+fn resolve_path(state: &AppState, segments: &[String]) -> AppResult<Option<ResolvedPath>> {
+    if segments.is_empty() {
+        return Ok(Some(ResolvedPath::Root));
+    }
+
+    let mut conn = state.db()?;
+    let mut parent_id: Option<Uuid> = None;
+    let mut chain: Vec<String> = Vec::new();
+    let mut current_folder: Option<Folder> = None;
+
+    for (index, segment) in segments.iter().enumerate() {
+        let is_last = index == segments.len() - 1;
+
+        match find_folder_by_name(&mut conn, parent_id, segment)? {
+            Some(folder) => {
+                if is_last {
+                    chain.push(folder.name.clone());
+                    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)?
+            {
+                chain.push(document.filename.clone());
+                return Ok(Some(ResolvedPath::Document {
+                    document,
+                    version,
+                    chain,
+                }));
+            }
+        }
+
+        if let Ok(uuid) = Uuid::parse_str(segment) {
+            if let Some(folder) = folders_dsl::folders
+                .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());
+                    return Ok(Some(ResolvedPath::Folder { folder, chain }));
+                }
+            }
+
+            if let Some((document, version)) = find_document_by_id(&mut conn, uuid)? {
+                if document.folder_id != parent_id {
+                    return Ok(None);
+                }
+                chain.push(document.filename.clone());
+                return Ok(Some(ResolvedPath::Document {
+                    document,
+                    version,
+                    chain,
+                }));
+            }
+        }
+
+        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);
+    }
+
+    Ok(current_folder.map(|folder| ResolvedPath::Folder { folder, chain }))
+}
+
+fn find_folder_by_name(
+    conn: &mut PgConnection,
+    parent_id: Option<Uuid>,
+    name: &str,
+) -> AppResult<Option<Folder>> {
+    let result = match parent_id {
+        Some(parent) => folders_dsl::folders
+            .filter(folders_dsl::parent_id.eq(Some(parent)))
+            .filter(folders_dsl::name.eq(name))
+            .first::<Folder>(conn)
+            .optional()?,
+        None => folders_dsl::folders
+            .filter(folders_dsl::parent_id.is_null())
+            .filter(folders_dsl::name.eq(name))
+            .first::<Folder>(conn)
+            .optional()?,
+    };
+
+    Ok(result)
+}
+
+fn find_document_by_filename(
+    conn: &mut PgConnection,
+    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::filename.eq(filename))
+        .into_boxed();
+
+    query = match parent_id {
+        Some(parent) => query.filter(documents_dsl::folder_id.eq(Some(parent))),
+        None => query.filter(documents_dsl::folder_id.is_null()),
+    };
+
+    if let Some(document) = query.first::<Document>(conn).optional()? {
+        let version = document_versions_dsl::document_versions
+            .find(document.current_version_id)
+            .first::<DocumentVersion>(conn)?;
+        return Ok(Some((document, version)));
+    }
+
+    Ok(None)
+}
+
+fn find_document_by_id(
+    conn: &mut PgConnection,
+    document_id: Uuid,
+) -> AppResult<Option<(Document, DocumentVersion)>> {
+    if let Some(document) = documents_dsl::documents
+        .filter(documents_dsl::deleted_at.is_null())
+        .find(document_id)
+        .first::<Document>(conn)
+        .optional()?
+    {
+        let version = document_versions_dsl::document_versions
+            .find(document.current_version_id)
+            .first::<DocumentVersion>(conn)?;
+        return Ok(Some((document, version)));
+    }
+
+    Ok(None)
+}

backend/src/schema.rs

@@ -1,5 +1,16 @@
 // @generated automatically by Diesel CLI.
 
+diesel::table! {
+    correspondents (id) {
+        id -> Uuid,
+        #[max_length = 255]
+        name -> Varchar,
+        metadata -> Jsonb,
+        created_at -> Timestamptz,
+        updated_at -> Timestamptz,
+    }
+}
+
 diesel::table! {
     document_assets (id) {
         id -> Uuid,
@@ -7,13 +18,22 @@ diesel::table! {
         asset_type -> Text,
         s3_key -> Text,
         mime_type -> Text,
-        width -> Nullable<Int4>,
-        height -> Nullable<Int4>,
         metadata -> Jsonb,
         created_at -> Timestamptz,
     }
 }
 
+diesel::table! {
+    document_correspondents (document_id, correspondent_id, role) {
+        document_id -> Uuid,
+        correspondent_id -> Uuid,
+        #[max_length = 32]
+        role -> Varchar,
+        assigned_at -> Timestamptz,
+        assigned_by -> Nullable<Uuid>,
+    }
+}
+
 diesel::table! {
     document_tags (document_id, tag_id) {
         document_id -> Uuid,
@@ -35,6 +55,7 @@ diesel::table! {
         checksum -> Varchar,
         created_at -> Timestamptz,
         operations_summary -> Jsonb,
+        metadata -> Jsonb,
     }
 }
 
@@ -48,7 +69,6 @@ diesel::table! {
         #[max_length = 100]
         content_type -> Nullable<Varchar>,
         folder_id -> Nullable<Uuid>,
-        current_version -> Int4,
         uploaded_at -> Timestamptz,
         updated_at -> Timestamptz,
         deleted_at -> Nullable<Timestamptz>,
@@ -56,6 +76,7 @@ diesel::table! {
         issued_at -> Nullable<Timestamptz>,
         #[max_length = 255]
         title -> Varchar,
+        current_version_id -> Uuid,
     }
 }
 
@@ -65,8 +86,6 @@ diesel::table! {
         #[max_length = 255]
         name -> Varchar,
         parent_id -> Nullable<Uuid>,
-        #[max_length = 1000]
-        path_cache -> Nullable<Varchar>,
         created_at -> Timestamptz,
         updated_at -> Timestamptz,
     }
@@ -125,15 +144,19 @@ diesel::table! {
 }
 
 diesel::joinable!(document_assets -> document_versions (document_version_id));
+diesel::joinable!(document_correspondents -> correspondents (correspondent_id));
+diesel::joinable!(document_correspondents -> documents (document_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 -> users (assigned_by));
-diesel::joinable!(document_versions -> documents (document_id));
 diesel::joinable!(documents -> folders (folder_id));
 diesel::joinable!(refresh_tokens -> users (user_id));
 
 diesel::allow_tables_to_appear_in_same_query!(
+    correspondents,
     document_assets,
+    document_correspondents,
     document_tags,
     document_versions,
     documents,

backend/src/workers/index.rs

@@ -129,8 +129,8 @@ impl JobHandler for IndexDocumentTextJob {
         let payload = json!({
             "document_id": context.document.id,
             "version_id": context.version.id,
-            "title": context.document.title,
-            "text": text,
+            "title": context.document.title.to_lowercase(),
+            "text": text.to_lowercase()
         });
 
         let body = serde_json::to_string(&payload).unwrap();

backend/src/workers/ocr.rs

@@ -377,8 +377,6 @@ fn persist_ocr_metadata(
         asset_type: OCR_TEXT_ASSET_TYPE.to_string(),
         s3_key: s3_key.to_string(),
         mime_type: "text/plain".to_string(),
-        width: None,
-        height: None,
         metadata: json!({
             "generated_at": Utc::now().to_rfc3339(),
             "source": source,

backend/src/workers/thumbnails.rs

@@ -1,14 +1,12 @@
-use std::{io::Cursor, panic, sync::Arc, time::Duration};
+use std::{convert::TryInto, io::Cursor, panic, sync::Arc, time::Duration};
 
 use async_trait::async_trait;
 use chrono::Utc;
 use diesel::{pg::upsert::excluded, prelude::*};
-use image::{
-    codecs::png::PngEncoder, ColorType, GenericImageView, ImageEncoder, ImageFormat, ImageReader,
-};
+use image::{GenericImageView, ImageFormat, ImageReader};
 use pdfium_render::prelude::*;
 use serde::Deserialize;
-use serde_json::json;
+use serde_json::{json, Map, Value};
 use tokio::task;
 use tracing::{error, info, warn};
 use uuid::Uuid;
@@ -24,7 +22,10 @@ use super::{analyze::determine_thumbnail_support, JobExecution, JobHandler};
 
 const THUMBNAIL_WIDTH: u32 = 512;
 const THUMBNAIL_HEIGHT: u32 = 512;
+const PREVIEW_WIDTH: u32 = THUMBNAIL_WIDTH * 4;
+const PREVIEW_HEIGHT: u32 = THUMBNAIL_HEIGHT * 4;
 const THUMBNAIL_ASSET_TYPE: &str = "thumbnail";
+const PREVIEW_ASSET_TYPE: &str = "preview";
 
 #[derive(Debug, Deserialize)]
 struct ThumbnailPayload {
@@ -95,28 +96,100 @@ impl JobHandler for GenerateThumbnailsJob {
             }
         };
 
-        let generation = match generate_thumbnail(&initial.document, &bytes) {
+        let generation = match generate_preview_and_thumbnail(&initial.document, &bytes) {
             Ok(result) => result,
             Err(err) => {
                 return JobExecution::Failed { error: err };
             }
         };
 
-        let asset_id = initial
-            .existing_asset
+        if let Some(page_count) = generation.page_count {
+            let state_clone = state.clone();
+            let document_id = initial.document.id;
+            let version_id = initial.version.id;
+            match task::spawn_blocking(move || {
+                persist_document_page_count(state_clone, document_id, version_id, page_count)
+            })
+            .await
+            {
+                Ok(Ok(())) => {}
+                Ok(Err(err)) => {
+                    warn!(
+                        job_id = %job.id,
+                        document_id = %document_id,
+                        version_id = %version_id,
+                        error = %err,
+                        "failed to update document page count metadata; retrying"
+                    );
+                    return JobExecution::Retry {
+                        delay: Duration::from_secs(30),
+                        error: err,
+                    };
+                }
+                Err(join_err) => {
+                    error!(
+                        job_id = %job.id,
+                        document_id = %document_id,
+                        version_id = %version_id,
+                        error = %join_err,
+                        "page count metadata task panicked"
+                    );
+                    return JobExecution::Retry {
+                        delay: Duration::from_secs(60),
+                        error: format!("metadata panic: {join_err}"),
+                    };
+                }
+            }
+        }
+
+        let thumbnail_asset_id = initial
+            .existing_thumbnail
             .as_ref()
             .map(|asset| asset.id)
             .unwrap_or_else(Uuid::new_v4);
-        let s3_key = format!(
+        let thumbnail_s3_key = format!(
             "documents/{}/v{}/assets/{}/{}",
-            initial.document.id, initial.version.version_number, THUMBNAIL_ASSET_TYPE, asset_id
+            initial.document.id,
+            initial.version.version_number,
+            THUMBNAIL_ASSET_TYPE,
+            thumbnail_asset_id
+        );
+
+        let preview_asset_id = initial
+            .existing_preview
+            .as_ref()
+            .map(|asset| asset.id)
+            .unwrap_or_else(Uuid::new_v4);
+        let preview_s3_key = format!(
+            "documents/{}/v{}/assets/{}/{}",
+            initial.document.id,
+            initial.version.version_number,
+            PREVIEW_ASSET_TYPE,
+            preview_asset_id
         );
 
         if let Err(err) = state
             .storage
             .put_object(
-                &s3_key,
-                generation.image_bytes.clone(),
+                &preview_s3_key,
+                generation.preview.image_bytes.clone(),
+                Some("image/png".into()),
+                None,
+            )
+            .await
+        {
+            warn!(job_id = %job.id, error = %err, "failed to upload preview; retrying");
+            return JobExecution::Retry {
+                delay: Duration::from_secs(30),
+                error: err.to_string(),
+            };
+        }
+
+        if let Err(err) = state
+            .storage
+            .put_object(
+                &thumbnail_s3_key,
+                generation.thumbnail.image_bytes.clone(),
                 Some("image/png".into()),
                 None,
             )
@@ -131,7 +204,24 @@ impl JobHandler for GenerateThumbnailsJob {
 
         let state_clone = state.clone();
         match task::spawn_blocking(move || {
-            persist_thumbnail_metadata(state_clone, &initial, &generation, asset_id, &s3_key)
+            persist_assets_metadata(
+                state_clone,
+                &initial,
+                &[
+                    AssetPersistence {
+                        asset_type: PREVIEW_ASSET_TYPE,
+                        asset_id: preview_asset_id,
+                        s3_key: &preview_s3_key,
+                        generated: &generation.preview,
+                    },
+                    AssetPersistence {
+                        asset_type: THUMBNAIL_ASSET_TYPE,
+                        asset_id: thumbnail_asset_id,
+                        s3_key: &thumbnail_s3_key,
+                        generated: &generation.thumbnail,
+                    },
+                ],
+            )
         })
         .await
         {
@@ -159,16 +249,30 @@ impl JobHandler for GenerateThumbnailsJob {
 struct ThumbnailContext {
     document: Document,
     version: DocumentVersion,
-    existing_asset: Option<DocumentAsset>,
+    existing_thumbnail: Option<DocumentAsset>,
+    existing_preview: Option<DocumentAsset>,
     skip: bool,
 }
 
-struct GeneratedThumbnail {
+struct GeneratedImage {
     image_bytes: Vec<u8>,
     width: Option<i32>,
     height: Option<i32>,
 }
 
+struct GeneratedAssets {
+    thumbnail: GeneratedImage,
+    preview: GeneratedImage,
+    page_count: Option<u32>,
+}
+
+struct AssetPersistence<'a> {
+    asset_type: &'static str,
+    asset_id: Uuid,
+    s3_key: &'a str,
+    generated: &'a GeneratedImage,
+}
+
 fn load_thumbnail_context(
     state: Arc<AppState>,
     payload: &ThumbnailPayload,
@@ -189,29 +293,45 @@ fn load_thumbnail_context(
         .first(&mut conn)
         .map_err(|err| format!("{err:?}"))?;
 
-    let existing: Option<DocumentAsset> = document_assets::table
+    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(THUMBNAIL_ASSET_TYPE))
-        .first(&mut conn)
-        .optional()
+        .filter(document_assets::asset_type.eq_any(vec![
+            THUMBNAIL_ASSET_TYPE.to_string(),
+            PREVIEW_ASSET_TYPE.to_string(),
+        ]))
+        .load(&mut conn)
         .map_err(|err| format!("{err:?}"))?;
 
+    let mut existing_thumbnail = None;
+    let mut existing_preview = None;
+    for asset in existing_assets {
+        match asset.asset_type.as_str() {
+            THUMBNAIL_ASSET_TYPE => existing_thumbnail = Some(asset),
+            PREVIEW_ASSET_TYPE => existing_preview = Some(asset),
+            _ => {}
+        }
+    }
+
     let (supported, _) = determine_thumbnail_support(&document);
     if !supported {
         return Err("thumbnail generation not supported for this document".into());
     }
 
-    let skip = existing.is_some() && !payload.force;
+    let skip = existing_thumbnail.is_some() && existing_preview.is_some() && !payload.force;
 
     Ok(ThumbnailContext {
         document,
         version,
-        existing_asset: existing,
+        existing_thumbnail,
+        existing_preview,
         skip,
     })
 }
 
-fn generate_thumbnail(document: &Document, bytes: &[u8]) -> Result<GeneratedThumbnail, String> {
+fn generate_preview_and_thumbnail(
+    document: &Document,
+    bytes: &[u8],
+) -> Result<GeneratedAssets, String> {
     let is_pdf = document
         .content_type
         .as_deref()
@@ -225,38 +345,55 @@ fn generate_thumbnail(document: &Document, bytes: &[u8]) -> Result<GeneratedThum
                 .unwrap_or(false)
         });
 
-    let (png_bytes, width, height) = if is_pdf {
-        generate_pdf_thumbnail(bytes)?
+    if is_pdf {
+        let pdf_assets = generate_pdf_assets(bytes)?;
+        Ok(GeneratedAssets {
+            preview: pdf_assets.preview,
+            thumbnail: pdf_assets.thumbnail,
+            page_count: Some(pdf_assets.page_count),
+        })
     } else {
-        generate_image_thumbnail(bytes)?
-    };
-
-    Ok(GeneratedThumbnail {
-        image_bytes: png_bytes,
-        width,
-        height,
-    })
+        let (preview, thumbnail) = generate_image_assets(bytes)?;
+        Ok(GeneratedAssets {
+            preview,
+            thumbnail,
+            page_count: None,
+        })
+    }
 }
 
-fn generate_image_thumbnail(bytes: &[u8]) -> Result<(Vec<u8>, Option<i32>, Option<i32>), String> {
+fn generate_image_assets(bytes: &[u8]) -> Result<(GeneratedImage, GeneratedImage), String> {
     let reader = ImageReader::new(Cursor::new(bytes))
         .with_guessed_format()
         .map_err(|err| err.to_string())?;
-    let mut image = reader.decode().map_err(|err| err.to_string())?;
-    if image.width() > THUMBNAIL_WIDTH || image.height() > THUMBNAIL_HEIGHT {
-        image = image.thumbnail(THUMBNAIL_WIDTH, THUMBNAIL_HEIGHT);
-    }
+    let image = reader.decode().map_err(|err| err.to_string())?;
 
-    let (width, height) = image.dimensions();
-    let mut cursor = Cursor::new(Vec::new());
-    image
-        .write_to(&mut cursor, ImageFormat::Png)
-        .map_err(|err| err.to_string())?;
-    let buffer = cursor.into_inner();
-    Ok((buffer, Some(width as i32), Some(height as i32)))
+    let preview_image = if image.width() > PREVIEW_WIDTH || image.height() > PREVIEW_HEIGHT {
+        image.thumbnail(PREVIEW_WIDTH, PREVIEW_HEIGHT)
+    } else {
+        image.clone()
+    };
+
+    let thumbnail_image =
+        if preview_image.width() > THUMBNAIL_WIDTH || preview_image.height() > THUMBNAIL_HEIGHT {
+            preview_image.thumbnail(THUMBNAIL_WIDTH, THUMBNAIL_HEIGHT)
+        } else {
+            preview_image.clone()
+        };
+
+    let preview = encode_dynamic_image(preview_image)?;
+    let thumbnail = encode_dynamic_image(thumbnail_image)?;
+
+    Ok((preview, thumbnail))
 }
 
-fn generate_pdf_thumbnail(bytes: &[u8]) -> Result<(Vec<u8>, Option<i32>, Option<i32>), String> {
+struct PdfGeneratedAssets {
+    preview: GeneratedImage,
+    thumbnail: GeneratedImage,
+    page_count: u32,
+}
+
+fn generate_pdf_assets(bytes: &[u8]) -> Result<PdfGeneratedAssets, String> {
     let pdfium = panic::catch_unwind(|| Pdfium::default())
         .map_err(|_| "failed to initialize PDFium".to_string())?;
 
@@ -264,14 +401,16 @@ fn generate_pdf_thumbnail(bytes: &[u8]) -> Result<(Vec<u8>, Option<i32>, Option<
         .load_pdf_from_byte_slice(bytes, None)
         .map_err(|err| format!("load pdf: {err}"))?;
 
-    let page = document
-        .pages()
+    let pages = document.pages();
+    let total_pages = pages.len();
+
+    let page = pages
         .get(0)
         .map_err(|err| format!("load first page: {err}"))?;
 
     let render_config = PdfRenderConfig::new()
-        .set_target_width(THUMBNAIL_WIDTH as i32)
-        .set_maximum_height(THUMBNAIL_HEIGHT as i32)
+        .set_target_width(PREVIEW_WIDTH as i32)
+        .set_maximum_height(PREVIEW_HEIGHT as i32)
         .render_form_data(true)
         .rotate_if_landscape(PdfPageRenderRotation::None, true);
 
@@ -279,54 +418,118 @@ fn generate_pdf_thumbnail(bytes: &[u8]) -> Result<(Vec<u8>, Option<i32>, Option<
         .render_with_config(&render_config)
         .map_err(|err| format!("render pdf page: {err}"))?;
 
-    let image = bitmap.as_image().to_rgb8();
-    let (width, height) = image.dimensions();
-    let mut cursor = Cursor::new(Vec::new());
-    PngEncoder::new(&mut cursor)
-        .write_image(image.as_raw(), width, height, ColorType::Rgb8.into())
-        .map_err(|err| format!("encode pdf thumbnail: {err}"))?;
+    let preview_buffer = bitmap.as_image().to_rgb8();
+    let preview_image = image::DynamicImage::ImageRgb8(preview_buffer);
 
-    Ok((cursor.into_inner(), Some(width as i32), Some(height as i32)))
+    let thumbnail_image =
+        if preview_image.width() > THUMBNAIL_WIDTH || preview_image.height() > THUMBNAIL_HEIGHT {
+            preview_image.thumbnail(THUMBNAIL_WIDTH, THUMBNAIL_HEIGHT)
+        } else {
+            preview_image.clone()
+        };
+
+    let preview = encode_dynamic_image(preview_image)?;
+    let thumbnail = 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,
+        thumbnail,
+        page_count,
+    })
 }
 
-fn persist_thumbnail_metadata(
+fn encode_dynamic_image(image: image::DynamicImage) -> Result<GeneratedImage, String> {
+    let (width, height) = image.dimensions();
+    let mut cursor = Cursor::new(Vec::new());
+    image
+        .write_to(&mut cursor, ImageFormat::Png)
+        .map_err(|err| err.to_string())?;
+    Ok(GeneratedImage {
+        image_bytes: cursor.into_inner(),
+        width: Some(width as i32),
+        height: Some(height as i32),
+    })
+}
+
+fn persist_assets_metadata(
     state: Arc<AppState>,
     context: &ThumbnailContext,
-    generated: &GeneratedThumbnail,
-    asset_id: Uuid,
-    s3_key: &str,
+    assets: &[AssetPersistence<'_>],
 ) -> Result<(), String> {
     let mut conn = state.db().map_err(|err| format!("{err:?}"))?;
 
-    let new_asset = NewDocumentAsset {
-        id: asset_id,
-        document_version_id: context.version.id,
-        asset_type: THUMBNAIL_ASSET_TYPE.to_string(),
-        s3_key: s3_key.to_string(),
-        mime_type: "image/png".to_string(),
-        width: generated.width,
-        height: generated.height,
-        metadata: json!({
-            "generated_at": Utc::now().to_rfc3339(),
-        }),
-    };
+    for asset in assets {
+        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,
+            }),
+        };
 
-    diesel::insert_into(document_assets::table)
-        .values(&new_asset)
-        .on_conflict((
-            document_assets::document_version_id,
-            document_assets::asset_type,
-        ))
-        .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::width.eq(excluded(document_assets::width)),
-            document_assets::height.eq(excluded(document_assets::height)),
-            document_assets::metadata.eq(excluded(document_assets::metadata)),
-        ))
-        .execute(&mut conn)
+        diesel::insert_into(document_assets::table)
+            .values(&new_asset)
+            .on_conflict((
+                document_assets::document_version_id,
+                document_assets::asset_type,
+            ))
+            .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)),
+            ))
+            .execute(&mut conn)
+            .map_err(|err| format!("{err:?}"))?;
+    }
+
+    Ok(())
+}
+
+fn persist_document_page_count(
+    state: Arc<AppState>,
+    document_id: Uuid,
+    document_version_id: Uuid,
+    page_count: u32,
+) -> Result<(), String> {
+    let mut conn = state.db().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))
+        .select(document_versions::metadata)
+        .first(&mut conn)
         .map_err(|err| format!("{err:?}"))?;
+
+    let updated = match existing_metadata {
+        Value::Object(mut map) => {
+            map.insert("page_count".to_string(), Value::from(page_count));
+            Value::Object(map)
+        }
+        _ => {
+            let mut map = Map::new();
+            map.insert("page_count".to_string(), Value::from(page_count));
+            Value::Object(map)
+        }
+    };
+
+    diesel::update(
+        document_versions::table
+            .filter(document_versions::id.eq(document_version_id))
+            .filter(document_versions::document_id.eq(document_id)),
+    )
+    .set(document_versions::metadata.eq(updated))
+    .execute(&mut conn)
+    .map_err(|err| format!("{err:?}"))?;
 
     Ok(())
 }

backend/tests/common/mod.rs

@@ -116,8 +116,11 @@ impl TestApp {
 
         let config = AppConfig {
             database_url: database_url.clone(),
+            database_max_pool_size: db::DEFAULT_MAX_POOL_SIZE,
             server_host: "127.0.0.1".to_string(),
             server_port: 0,
+            webdav_host: "127.0.0.1".to_string(),
+            webdav_port: 0,
             jwt_secret: "test-secret".to_string(),
             jwt_issuer: "test-issuer".to_string(),
             jwt_audience: "test-audience".to_string(),
@@ -137,7 +140,7 @@ impl TestApp {
             quickwit_index: None,
         };
 
-        let pool = db::init_pool(&config.database_url)?;
+        let pool = db::init_pool_with_size(&config.database_url, config.database_max_pool_size)?;
         prepare_database(&pool).await?;
 
         let storage = Arc::new(FakeStorage::default());

backend/tests/documents_flow.rs

@@ -9,8 +9,6 @@ use uuid::Uuid;
 #[derive(Deserialize)]
 struct DocumentDetail {
     document: DocumentInfo,
-    current_version: DocumentVersion,
-    assets: Vec<DocumentAssetInfo>,
 }
 
 #[derive(Deserialize)]
@@ -18,11 +16,13 @@ struct DocumentInfo {
     id: Uuid,
     title: String,
     original_name: String,
-    current_version: i32,
     deleted_at: Option<String>,
     issued_at: Option<String>,
     tags: Vec<TagSummary>,
-    download_path: String,
+    #[serde(default)]
+    correspondents: Vec<DocumentCorrespondentInfo>,
+    #[serde(default)]
+    current_version: Option<DocumentVersion>,
 }
 
 #[derive(Deserialize)]
@@ -30,6 +30,10 @@ struct DocumentVersion {
     id: Uuid,
     s3_key: String,
     size_bytes: i64,
+    version_number: i32,
+    download_path: String,
+    #[serde(default)]
+    assets: Vec<DocumentAssetInfo>,
 }
 
 #[allow(dead_code)]
@@ -42,8 +46,8 @@ struct DocumentAssetInfo {
 #[derive(Deserialize)]
 struct DocumentListItem {
     id: Uuid,
-    current_version: i32,
-    download_path: String,
+    #[serde(default)]
+    current_version: Option<DocumentVersion>,
 }
 
 #[derive(Deserialize)]
@@ -73,6 +77,23 @@ struct TagSummary {
     label: String,
 }
 
+#[derive(Deserialize)]
+struct DocumentCorrespondentInfo {
+    name: String,
+    role: String,
+}
+
+#[derive(Deserialize)]
+struct CorrespondentSummary {
+    id: Uuid,
+}
+
+#[derive(Deserialize)]
+struct BulkCorrespondentResult {
+    assigned: usize,
+    removed: usize,
+}
+
 #[derive(Deserialize)]
 struct AnalyzeJobPayload {
     document_id: Uuid,
@@ -152,17 +173,22 @@ async fn upload_and_list_document() -> Result<()> {
 
     assert_eq!(detail.document.original_name, "doc.txt");
     assert_eq!(detail.document.title, "doc");
-    assert_eq!(detail.document.current_version, 1);
     assert_eq!(detail.document.deleted_at, None);
     assert!(detail.document.issued_at.is_none());
     assert!(detail.document.tags.is_empty());
-    assert!(detail.document.download_path.starts_with("/download/"));
-    assert_eq!(detail.current_version.size_bytes, file_bytes.len() as i64);
-    assert!(detail.assets.is_empty());
+    let current_version = detail
+        .document
+        .current_version
+        .as_ref()
+        .expect("current version detail");
+    assert!(current_version.download_path.starts_with("/download/"));
+    assert_eq!(current_version.version_number, 1);
+    assert_eq!(current_version.size_bytes, file_bytes.len() as i64);
+    assert!(current_version.assets.is_empty());
 
     let stored = app
         .storage()
-        .get(&detail.current_version.s3_key)
+        .get(&current_version.s3_key)
         .await
         .expect("object stored");
     assert_eq!(stored.bytes, file_bytes);
@@ -175,8 +201,18 @@ async fn upload_and_list_document() -> Result<()> {
     assert_eq!(list.len(), 1);
     let item = list.pop().unwrap();
     assert_eq!(item.id, detail.document.id);
-    assert_eq!(item.current_version, 1);
-    assert!(item.download_path.starts_with("/download/"));
+    assert_eq!(
+        item.current_version
+            .as_ref()
+            .map(|version| version.version_number),
+        Some(1)
+    );
+    assert!(item
+        .current_version
+        .as_ref()
+        .expect("list current version")
+        .download_path
+        .starts_with("/download/"));
 
     let download = app
         .get(
@@ -187,17 +223,17 @@ async fn upload_and_list_document() -> Result<()> {
     assert_eq!(download.status(), StatusCode::OK);
     let body = body_to_vec(download.into_body()).await?;
     let download_info: DocumentDownload = serde_json::from_slice(&body)?;
-    assert!(download_info.url.contains(&detail.current_version.s3_key));
+    assert!(download_info.url.contains(&current_version.s3_key));
     assert_eq!(download_info.filename, "doc.txt");
 
-    let redirect = app.get(&detail.document.download_path, None).await?;
+    let redirect = app.get(&current_version.download_path, None).await?;
     assert_eq!(redirect.status(), StatusCode::TEMPORARY_REDIRECT);
     let location = redirect
         .headers()
         .get("location")
         .expect("redirect location header");
     let location = location.to_str().expect("location header utf8");
-    assert!(location.contains(&detail.current_version.s3_key));
+    assert!(location.contains(&current_version.s3_key));
 
     app.cleanup().await?;
     Ok(())
@@ -243,7 +279,13 @@ async fn duplicate_and_restore_document() -> Result<()> {
 
     assert_eq!(first_detail.document.id, second_detail.document.id);
     assert_eq!(second_detail.document.deleted_at, None);
-    assert!(second_detail.assets.is_empty());
+    assert!(second_detail
+        .document
+        .current_version
+        .as_ref()
+        .expect("second current version")
+        .assets
+        .is_empty());
     assert_eq!(app.storage().object_count().await, 1);
 
     let delete = app
@@ -341,8 +383,24 @@ async fn bulk_reanalyze_documents() -> Result<()> {
     }
 
     let mut expected = vec![
-        (first_detail.document.id, first_detail.current_version.id),
-        (second_detail.document.id, second_detail.current_version.id),
+        (
+            first_detail.document.id,
+            first_detail
+                .document
+                .current_version
+                .as_ref()
+                .expect("first current version")
+                .id,
+        ),
+        (
+            second_detail.document.id,
+            second_detail
+                .document
+                .current_version
+                .as_ref()
+                .expect("second current version")
+                .id,
+        ),
     ];
     payload_docs.sort();
     expected.sort();
@@ -577,6 +635,234 @@ async fn bulk_update_tags_for_selection() -> Result<()> {
     Ok(())
 }
 
+#[tokio::test]
+async fn bulk_assign_correspondents_to_selection() -> Result<()> {
+    let _lock = acquire_db_lock().await;
+    let app = TestApp::new().await?;
+
+    let password = "bulkcorresp";
+    app.insert_user("corra", password, "admin").await?;
+    let token = app.login_token("corra", password).await?;
+
+    let first = app
+        .upload_document(
+            "/api/documents",
+            "letter-one.txt",
+            "text/plain",
+            b"letter one",
+            None,
+            &token,
+        )
+        .await?;
+    assert_eq!(first.status(), StatusCode::CREATED);
+    let first_body = body_to_vec(first.into_body()).await?;
+    let first_detail: DocumentDetail = serde_json::from_slice(&first_body)?;
+
+    let second = app
+        .upload_document(
+            "/api/documents",
+            "letter-two.txt",
+            "text/plain",
+            b"letter two",
+            None,
+            &token,
+        )
+        .await?;
+    assert_eq!(second.status(), StatusCode::CREATED);
+    let second_body = body_to_vec(second.into_body()).await?;
+    let second_detail: DocumentDetail = serde_json::from_slice(&second_body)?;
+
+    let sender = app
+        .post_json(
+            "/api/correspondents",
+            &serde_json::json!({ "name": "Acme Corp" }),
+            Some(&token),
+        )
+        .await?;
+    assert_eq!(sender.status(), StatusCode::OK);
+    let sender_body = body_to_vec(sender.into_body()).await?;
+    let sender_summary: CorrespondentSummary = serde_json::from_slice(&sender_body)?;
+
+    let receiver = app
+        .post_json(
+            "/api/correspondents",
+            &serde_json::json!({ "name": "Bank Ltd" }),
+            Some(&token),
+        )
+        .await?;
+    assert_eq!(receiver.status(), StatusCode::OK);
+    let receiver_body = body_to_vec(receiver.into_body()).await?;
+    let receiver_summary: CorrespondentSummary = serde_json::from_slice(&receiver_body)?;
+
+    let assign_payload = serde_json::json!({
+        "document_ids": [
+            first_detail.document.id,
+            second_detail.document.id
+        ],
+        "assignments": [
+            {
+                "correspondent_id": sender_summary.id,
+                "role": "sender"
+            },
+            {
+                "correspondent_id": receiver_summary.id,
+                "role": "receiver"
+            }
+        ]
+    });
+
+    let assign_resp = app
+        .post_json(
+            "/api/documents/bulk/correspondents",
+            &assign_payload,
+            Some(&token),
+        )
+        .await?;
+    assert_eq!(assign_resp.status(), StatusCode::OK);
+    let assign_body = body_to_vec(assign_resp.into_body()).await?;
+    let assign_result: BulkCorrespondentResult = serde_json::from_slice(&assign_body)?;
+    assert_eq!(assign_result.assigned, 4);
+    assert_eq!(assign_result.removed, 0);
+
+    for doc_id in [first_detail.document.id, second_detail.document.id] {
+        let refreshed = app
+            .get(&format!("/api/documents/{doc_id}"), Some(&token))
+            .await?;
+        assert_eq!(refreshed.status(), StatusCode::OK);
+        let refreshed_body = body_to_vec(refreshed.into_body()).await?;
+        let detail: DocumentDetail = serde_json::from_slice(&refreshed_body)?;
+        assert_eq!(detail.document.correspondents.len(), 2);
+        assert!(detail
+            .document
+            .correspondents
+            .iter()
+            .any(|entry| entry.role == "sender" && entry.name == "Acme Corp"));
+        assert!(detail
+            .document
+            .correspondents
+            .iter()
+            .any(|entry| entry.role == "receiver" && entry.name == "Bank Ltd"));
+    }
+
+    let duplicate_resp = app
+        .post_json(
+            "/api/documents/bulk/correspondents",
+            &assign_payload,
+            Some(&token),
+        )
+        .await?;
+    assert_eq!(duplicate_resp.status(), StatusCode::OK);
+    let duplicate_body = body_to_vec(duplicate_resp.into_body()).await?;
+    let duplicate_result: BulkCorrespondentResult = serde_json::from_slice(&duplicate_body)?;
+    assert_eq!(duplicate_result.assigned, 0);
+    assert_eq!(duplicate_result.removed, 0);
+
+    let replacement = app
+        .post_json(
+            "/api/correspondents",
+            &serde_json::json!({ "name": "Charlie" }),
+            Some(&token),
+        )
+        .await?;
+    assert_eq!(replacement.status(), StatusCode::OK);
+    let replacement_body = body_to_vec(replacement.into_body()).await?;
+    let replacement_summary: CorrespondentSummary = serde_json::from_slice(&replacement_body)?;
+
+    let replace_payload = serde_json::json!({
+        "document_ids": [
+            first_detail.document.id,
+            second_detail.document.id
+        ],
+        "assignments": [
+            {
+                "correspondent_id": replacement_summary.id,
+                "role": "sender"
+            }
+        ]
+    });
+
+    let replace_resp = app
+        .post_json(
+            "/api/documents/bulk/correspondents",
+            &replace_payload,
+            Some(&token),
+        )
+        .await?;
+    assert_eq!(replace_resp.status(), StatusCode::OK);
+    let replace_body = body_to_vec(replace_resp.into_body()).await?;
+    let replace_result: BulkCorrespondentResult = serde_json::from_slice(&replace_body)?;
+    assert_eq!(replace_result.assigned, 2);
+    assert_eq!(replace_result.removed, 2);
+
+    for doc_id in [first_detail.document.id, second_detail.document.id] {
+        let refreshed = app
+            .get(&format!("/api/documents/{doc_id}"), Some(&token))
+            .await?;
+        let refreshed_body = body_to_vec(refreshed.into_body()).await?;
+        let detail: DocumentDetail = serde_json::from_slice(&refreshed_body)?;
+        assert_eq!(detail.document.correspondents.len(), 2);
+        assert!(detail
+            .document
+            .correspondents
+            .iter()
+            .any(|entry| entry.role == "sender" && entry.name == "Charlie"));
+        assert!(detail
+            .document
+            .correspondents
+            .iter()
+            .any(|entry| entry.role == "receiver" && entry.name == "Bank Ltd"));
+    }
+
+    let remove_payload = serde_json::json!({
+        "document_ids": [
+            first_detail.document.id,
+            second_detail.document.id
+        ],
+        "assignments": [
+            {
+                "correspondent_id": receiver_summary.id,
+                "role": "receiver"
+            }
+        ],
+        "action": "remove"
+    });
+
+    let remove_resp = app
+        .post_json(
+            "/api/documents/bulk/correspondents",
+            &remove_payload,
+            Some(&token),
+        )
+        .await?;
+    assert_eq!(remove_resp.status(), StatusCode::OK);
+    let remove_body = body_to_vec(remove_resp.into_body()).await?;
+    let remove_result: BulkCorrespondentResult = serde_json::from_slice(&remove_body)?;
+    assert_eq!(remove_result.assigned, 0);
+    assert_eq!(remove_result.removed, 2);
+
+    for doc_id in [first_detail.document.id, second_detail.document.id] {
+        let refreshed = app
+            .get(&format!("/api/documents/{doc_id}"), Some(&token))
+            .await?;
+        let refreshed_body = body_to_vec(refreshed.into_body()).await?;
+        let detail: DocumentDetail = serde_json::from_slice(&refreshed_body)?;
+        assert_eq!(detail.document.correspondents.len(), 1);
+        assert!(detail
+            .document
+            .correspondents
+            .iter()
+            .any(|entry| entry.role == "sender" && entry.name == "Charlie"));
+        assert!(!detail
+            .document
+            .correspondents
+            .iter()
+            .any(|entry| entry.role == "receiver"));
+    }
+
+    app.cleanup().await?;
+    Ok(())
+}
+
 #[tokio::test]
 async fn bulk_reanalyze_selected_documents() -> Result<()> {
     let _lock = acquire_db_lock().await;
@@ -661,8 +947,24 @@ async fn bulk_reanalyze_selected_documents() -> Result<()> {
         .all(|(doc_id, _)| *doc_id != second_detail.document.id));
 
     let mut expected = vec![
-        (first_detail.document.id, first_detail.current_version.id),
-        (third_detail.document.id, third_detail.current_version.id),
+        (
+            first_detail.document.id,
+            first_detail
+                .document
+                .current_version
+                .as_ref()
+                .expect("first current version")
+                .id,
+        ),
+        (
+            third_detail.document.id,
+            third_detail
+                .document
+                .current_version
+                .as_ref()
+                .expect("third current version")
+                .id,
+        ),
     ];
     payload_docs.sort();
     expected.sort();

backend/tests/folders_flow.rs

@@ -15,10 +15,13 @@ struct FolderResponse {
 #[derive(Deserialize)]
 struct FolderInfo {
     id: Uuid,
+    name: String,
 }
 
 #[derive(Deserialize)]
 struct FolderContents {
+    folder: Option<FolderInfo>,
+    subfolders: Vec<FolderInfo>,
     documents: Vec<DocSummary>,
 }
 
@@ -39,6 +42,14 @@ struct EnsureFolderPath<'a> {
     segments: &'a [&'a str],
 }
 
+#[derive(Serialize)]
+struct UpdateFolderRequest {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    parent_id: Option<Option<Uuid>>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    name: Option<String>,
+}
+
 #[derive(Serialize)]
 struct MoveDocumentRequest {
     folder_id: Option<Uuid>,
@@ -215,3 +226,93 @@ async fn ensure_path_creates_nested_folders() -> Result<()> {
     app.cleanup().await?;
     Ok(())
 }
+
+#[tokio::test]
+async fn folder_rename_updates_name_and_child_paths() -> Result<()> {
+    let _lock = acquire_db_lock().await;
+    let app = TestApp::new().await?;
+
+    let password = "renamepass";
+    app.insert_user("rename-admin", password, "admin").await?;
+    let token = app.login_token("rename-admin", password).await?;
+
+    let parent_resp = app
+        .post_json(
+            "/api/folders",
+            &CreateFolder {
+                name: "Projects",
+                parent_id: None,
+            },
+            Some(&token),
+        )
+        .await?;
+    assert_eq!(parent_resp.status(), StatusCode::OK);
+    let parent_body = body_to_vec(parent_resp.into_body()).await?;
+    let parent: FolderResponse = serde_json::from_slice(&parent_body)?;
+
+    let child_resp = app
+        .post_json(
+            "/api/folders",
+            &CreateFolder {
+                name: "Q1",
+                parent_id: Some(parent.folder.id),
+            },
+            Some(&token),
+        )
+        .await?;
+    assert_eq!(child_resp.status(), StatusCode::OK);
+    let child_body = body_to_vec(child_resp.into_body()).await?;
+    let child: FolderResponse = serde_json::from_slice(&child_body)?;
+
+    let rename_resp = app
+        .patch_json(
+            &format!("/api/folders/{}", parent.folder.id),
+            &UpdateFolderRequest {
+                parent_id: None,
+                name: Some("Archive".to_string()),
+            },
+            Some(&token),
+        )
+        .await?;
+    assert_eq!(rename_resp.status(), StatusCode::NO_CONTENT);
+
+    let root_contents = app.get("/api/folders/root/contents", Some(&token)).await?;
+    assert_eq!(root_contents.status(), StatusCode::OK);
+    let root_body = body_to_vec(root_contents.into_body()).await?;
+    let root: FolderContents = serde_json::from_slice(&root_body)?;
+    let renamed = root
+        .subfolders
+        .iter()
+        .find(|f| f.id == parent.folder.id)
+        .expect("renamed folder present");
+    assert_eq!(renamed.name, "Archive");
+
+    let folders_only = app
+        .get(
+            &format!(
+                "/api/folders/{}/contents?include_documents=false",
+                parent.folder.id
+            ),
+            Some(&token),
+        )
+        .await?;
+    assert_eq!(folders_only.status(), StatusCode::OK);
+    let folders_only_body = body_to_vec(folders_only.into_body()).await?;
+    let folders_only_contents: FolderContents = serde_json::from_slice(&folders_only_body)?;
+    assert!(folders_only_contents.documents.is_empty());
+
+    let child_contents = app
+        .get(
+            &format!("/api/folders/{}/contents", child.folder.id),
+            Some(&token),
+        )
+        .await?;
+    assert_eq!(child_contents.status(), StatusCode::OK);
+    let child_contents_body = body_to_vec(child_contents.into_body()).await?;
+    let child_details: FolderContents = serde_json::from_slice(&child_contents_body)?;
+    let child_folder = child_details.folder.expect("child folder info");
+    assert_eq!(child_folder.name, "Q1");
+
+    app.cleanup().await?;
+    Ok(())
+}

docs/api.txt

@@ -0,0 +1,66 @@
+Papercrate REST API
+===================
+
+Unless noted otherwise, endpoints below require a valid `Authorization: Bearer <token>` header.
+
+Authentication
+--------------
+- POST /api/auth/login - Exchange username/password for an access token and refresh cookie (public).
+- POST /api/auth/refresh - Rotate the refresh cookie and return a new access token (public, requires refresh cookie).
+- POST /api/auth/logout - Revoke the caller's refresh tokens and clear the cookie.
+- GET  /api/auth/me - Return the authenticated principal payload.
+
+Health
+------
+- GET  /api/health - Lightweight liveness probe (no authentication required).
+
+Documents
+---------
+- GET  /api/documents - List or search documents. Optional filters: `folder_id` (defaults to root when omitted), `include_deleted`, `include_descendants` (defaults to true when a `folder_id` is provided and no other override is supplied), `query` (Quickwit full-text), `tags` (comma-separated tag UUIDs), and `correspondents` (comma-separated correspondent UUIDs). Each entry includes tags, correspondent assignments, and current version info.
+- POST /api/documents - Upload a document via multipart form-data (`file`, optional metadata/folder fields).
+- POST /api/documents/reanalyze - Queue re-analysis for every non-deleted document.
+- POST /api/documents/bulk/move - Move multiple documents to a target folder.
+- POST /api/documents/bulk/tags - Add or remove tags across multiple documents.
+- POST /api/documents/bulk/correspondents - Bulk correspondent actions. Default `action=add` replaces existing assignments for the provided roles before adding the supplied correspondents; `action=remove` drops the specified correspondent/role pairs.
+- POST /api/documents/bulk/reanalyze - Queue re-analysis jobs for selected documents.
+- GET  /api/documents/:id - Retrieve metadata and current version details for a document.
+- PATCH /api/documents/:id - Update document metadata (currently title).
+- DELETE /api/documents/:id - Soft-delete a document.
+- GET  /api/documents/:id/download - Create a pre-signed download URL for the current version.
+- PATCH /api/documents/:id/folder - Move a document to another folder.
+- POST /api/documents/:id/tags - Assign one or more tags to a document.
+- DELETE /api/documents/:id/tags/:tag_id - Remove a single tag from a document.
+- POST /api/documents/:id/correspondents - Assign correspondents to roles (`assignments[]` with `correspondent_id` and `role`; optional `replace=true` overwrites existing assignments for those roles). Valid roles: `sender`, `receiver`, `other`.
+- DELETE /api/documents/:id/correspondents/:correspondent_id - Remove a correspondent assignment (requires `role` query string).
+
+Document Assets
+---------------
+- GET  /api/documents/:id/assets - List generated assets for the current version.
+- POST /api/documents/:id/assets - Request (re)generation of document assets; accepts optional `force` query flag.
+- GET  /api/documents/:id/assets/:asset_id - Fetch metadata and a pre-signed URL for a specific asset.
+
+Downloads
+---------
+- GET  /download/:token - Follow a one-time download token; redirects to a pre-signed URL (public token required).
+
+Folders
+-------
+- POST /api/folders - Create a folder (optionally under a parent).
+- POST /api/folders/path - Ensure a nested folder path exists, creating missing segments.
+- GET  /api/folders/:id/contents - List subfolders and documents inside a folder; use `root` for the workspace root.
+- DELETE /api/folders/:id - Soft-delete a folder.
+- PATCH /api/folders/:id - Update a folder's parent (`parent_id`) and/or rename it (`name`).
+
+Tags
+----
+- GET  /api/tags - List all tags with usage counts.
+- POST /api/tags - Create a new tag.
+- PATCH /api/tags/:id - Update a tag's label or color.
+- DELETE /api/tags/:id - Remove a tag; fails with 400 if still assigned to any document.
+
+Correspondents
+--------------
+- GET  /api/correspondents - List correspondents with usage totals and per-role counts (roles: `sender`, `receiver`, `other`).
+- POST /api/correspondents - Create a correspondent (name + optional metadata JSON).
+- PATCH /api/correspondents/:id - Update name and/or metadata.
+- DELETE /api/correspondents/:id - Remove a correspondent; fails with 400 if referenced by any document.

frontend/README.md

@@ -41,3 +41,7 @@ npm run build
 - Tag management (create/assign/remove) from the detail panel
 - Login via the seeded admin account (`admin` / `adminadmin`) with stored JWT session
 - Inline status banner for quick feedback on API interactions
+
+## Assets
+
+- The folder icon (`public/folder.svg`) is derived from the Adwaita icon theme by the [GNOME Project](http://www.gnome.org/).

frontend/package-lock.json

@@ -8,6 +8,7 @@
       "name": "papercrate-frontend",
       "version": "0.1.0",
       "dependencies": {
+        "@tabler/icons-react": "3.11.0",
         "axios": "1.7.7",
         "react": "18.3.1",
         "react-dom": "18.3.1",
@@ -1963,6 +1964,32 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/@tabler/icons": {
+      "version": "3.11.0",
+      "resolved": "https://registry.npmjs.org/@tabler/icons/-/icons-3.11.0.tgz",
+      "integrity": "sha512-/vZinJNvCYhdAB+RUsyCpanSPuOEKHHIZi4Uu0Bw7ilewHnQhCWUPrT704uHCRli2ROl7spADPmWzAqOganA5A==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/codecalm"
+      }
+    },
+    "node_modules/@tabler/icons-react": {
+      "version": "3.11.0",
+      "resolved": "https://registry.npmjs.org/@tabler/icons-react/-/icons-react-3.11.0.tgz",
+      "integrity": "sha512-xHNBi9mns1slvqos+7LkP3ube4CjWrANMbxMaorzwzO9J/+y1sAEG/sN8CV8FmtpYW/9/gDR+OWCjjLLg0RmAw==",
+      "license": "MIT",
+      "dependencies": {
+        "@tabler/icons": "3.11.0"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/codecalm"
+      },
+      "peerDependencies": {
+        "react": ">= 16"
+      }
+    },
     "node_modules/@types/body-parser": {
       "version": "1.19.6",
       "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.19.6.tgz",

frontend/package.json

@@ -9,6 +9,7 @@
     "lint": "echo \"No linting configured\""
   },
   "dependencies": {
+    "@tabler/icons-react": "3.11.0",
     "axios": "1.7.7",
     "react": "18.3.1",
     "react-dom": "18.3.1",

frontend/public/folder.svg

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg height="128px" viewBox="0 0 128 128" width="128px" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <linearGradient id="a" gradientTransform="matrix(0.45451 0 0 0.455522 -1210.292114 616.172607)" gradientUnits="userSpaceOnUse" x1="2689.251953" x2="2918.069824" y1="-1106.802979" y2="-1106.802979">
+        <stop offset="0" stop-color="#62a0ea"/>
+        <stop offset="0.0576991" stop-color="#afd4ff"/>
+        <stop offset="0.122204" stop-color="#62a0ea"/>
+        <stop offset="0.873306" stop-color="#62a0ea"/>
+        <stop offset="0.955997" stop-color="#c0d5ea"/>
+        <stop offset="1" stop-color="#62a0ea"/>
+    </linearGradient>
+    <path d="m 21.976562 12 c -5.527343 0 -9.976562 4.460938 -9.976562 10 v 86.03125 c 0 5.542969 4.449219 10 9.976562 10 h 84.042969 c 5.53125 0 9.980469 -4.457031 9.980469 -10 v -72.085938 c 0 -6.628906 -5.359375 -12 -11.972656 -12 h -46.027344 c -2.453125 0 -4.695312 -1.386718 -5.796875 -3.582031 l -1.503906 -2.992187 c -1.65625 -3.292969 -5.019531 -5.371094 -8.699219 -5.371094 z m 0 0" fill="#438de6"/>
+    <path d="m 65.976562 36 c -2.746093 0 -5.226562 1.101562 -7.027343 2.890625 c -2.273438 2.253906 -5.382813 5.109375 -8.632813 5.109375 h -28.339844 c -5.527343 0 -9.976562 4.460938 -9.976562 10 v 54.03125 c 0 5.542969 4.449219 10 9.976562 10 h 84.042969 c 5.53125 0 9.980469 -4.457031 9.980469 -10 v -62.03125 c 0 -5.539062 -4.449219 -10 -9.980469 -10 z m 0 0" fill="url(#a)"/>
+    <path d="m 65.976562 32 c -2.746093 0 -5.226562 1.101562 -7.027343 2.890625 c -2.273438 2.253906 -5.382813 5.109375 -8.632813 5.109375 h -28.339844 c -5.527343 0 -9.976562 4.460938 -9.976562 10 v 55.976562 c 0 5.539063 4.449219 10 9.976562 10 h 84.042969 c 5.53125 0 9.980469 -4.460937 9.980469 -10 v -63.976562 c 0 -5.539062 -4.449219 -10 -9.980469 -10 z m 0 0" fill="#a4caee"/>
+</svg>

frontend/src/asset_manager.js

@@ -0,0 +1,226 @@
+export const getAssetFromGroup = (assets, assetType) => {
+  if (!assetType || !assets) {
+    return null;
+  }
+
+  if (Array.isArray(assets)) {
+    return assets.find((entry) => entry?.asset_type === assetType) || null;
+  }
+
+  return assets?.[assetType] || null;
+};
+
+export const getAssetFromVersion = (currentVersion, assetType) => {
+  if (!currentVersion) {
+    return null;
+  }
+  return getAssetFromGroup(currentVersion.assets, assetType);
+};
+
+export const resolveDocumentAssetUrl = (doc, type, { ensureAssetUrl, getAsset, ensureOptions } = {}) => {
+  if (!doc || !type) {
+    return null;
+  }
+  const asset = typeof getAsset === 'function' ? getAsset(doc, type) : null;
+  if (!asset) {
+    return null;
+  }
+  const now = Date.now();
+  const expiresAt = typeof asset.expiresAt === 'number' ? asset.expiresAt : null;
+  const hasFreshUrl = asset.url && (!expiresAt || expiresAt > now);
+  if (hasFreshUrl) {
+    return asset.url;
+  }
+  if (doc.id && asset.id && typeof ensureAssetUrl === 'function') {
+    const force = Boolean(asset.url && expiresAt && expiresAt <= now);
+    const options = ensureOptions ? { ...ensureOptions, force } : { force };
+    ensureAssetUrl(doc.id, asset, options).catch(() => {});
+  }
+  return null;
+};
+
+class AssetManager {
+  constructor({ api, assetPresignTtlMs }) {
+    this.api = api;
+    this.assetPresignTtlMs = assetPresignTtlMs;
+    this.assetCache = new Map();
+    this.assetInflight = new Map();
+  }
+
+  setApi(api) {
+    this.api = api;
+  }
+
+  rememberAsset(entry) {
+    if (entry?.id) {
+      this.assetCache.set(entry.id, entry);
+    }
+  }
+
+  hydrateAsset(asset) {
+    if (!asset || !asset.id) {
+      return asset;
+    }
+    const cached = this.assetCache.get(asset.id);
+    if (!cached) {
+      return asset;
+    }
+    const merged = { ...cached, ...asset };
+    if (cached.url && !asset.url) {
+      merged.url = cached.url;
+    }
+    if (cached.expiresAt) {
+      const cachedExpires = Number(cached.expiresAt) || null;
+      const assetExpires = Number(asset.expiresAt) || null;
+      if (!assetExpires || (cachedExpires && cachedExpires > assetExpires)) {
+        merged.expiresAt = cachedExpires;
+      }
+    }
+    return merged;
+  }
+
+  hydrateDocument(document) {
+    if (!document) {
+      return document;
+    }
+
+    const currentVersion = document.current_version || null;
+    if (!currentVersion) {
+      return document;
+    }
+
+    let changed = false;
+    let nextAssets = currentVersion.assets;
+
+    if (nextAssets && !Array.isArray(nextAssets)) {
+      const hydrated = {};
+      Object.keys(nextAssets).forEach((key) => {
+        hydrated[key] = this.hydrateAsset(nextAssets[key]);
+        if (hydrated[key] !== nextAssets[key]) {
+          changed = true;
+        }
+      });
+      if (changed) {
+        nextAssets = { ...nextAssets, ...hydrated };
+      }
+    } else if (Array.isArray(nextAssets)) {
+      const hydratedList = nextAssets.map((item) => this.hydrateAsset(item));
+      if (
+        hydratedList.length !== nextAssets.length ||
+        hydratedList.some((item, index) => item !== nextAssets[index])
+      ) {
+        changed = true;
+        nextAssets = hydratedList;
+      }
+    }
+
+    if (!changed) {
+      return document;
+    }
+
+    const nextCurrentVersion = { ...currentVersion, assets: nextAssets };
+    return { ...document, current_version: nextCurrentVersion };
+  }
+
+  hydrateDocuments(documents) {
+    if (!Array.isArray(documents)) {
+      return documents;
+    }
+    return documents.map((doc) => this.hydrateDocument(doc));
+  }
+
+  hydrateDetail(detail) {
+    if (!detail) {
+      return detail;
+    }
+    let changed = false;
+    const next = { ...detail };
+
+    if (detail.document) {
+      const hydratedDocument = this.hydrateDocument(detail.document);
+      if (hydratedDocument !== detail.document) {
+        next.document = hydratedDocument;
+        changed = true;
+      }
+    }
+
+    if (Array.isArray(detail.assets)) {
+      const hydratedAssets = detail.assets.map((item) => this.hydrateAsset(item));
+      if (
+        hydratedAssets.length !== detail.assets.length ||
+        hydratedAssets.some((item, index) => item !== detail.assets[index])
+      ) {
+        next.assets = hydratedAssets;
+        changed = true;
+      }
+    }
+
+    return changed ? next : detail;
+  }
+
+  hydrateFolderContents(contents) {
+    if (!contents) {
+      return contents;
+    }
+    const next = { ...contents };
+    if (Array.isArray(contents.documents)) {
+      next.documents = this.hydrateDocuments(contents.documents);
+    }
+    if (contents.document) {
+      next.document = this.hydrateDocument(contents.document);
+    }
+    return next;
+  }
+
+  ensureAsset(documentId, asset, { force = false } = {}) {
+    if (!documentId || !asset?.id) {
+      return Promise.resolve(asset || null);
+    }
+
+    const assetExpiresAt = typeof asset.expiresAt === 'number' ? asset.expiresAt : null;
+    if (!force && asset?.url && (!assetExpiresAt || assetExpiresAt > Date.now())) {
+      this.rememberAsset(asset);
+      return Promise.resolve(asset);
+    }
+
+    const cached = this.assetCache.get(asset.id);
+    const now = Date.now();
+    if (!force && cached && cached.expiresAt && cached.expiresAt > now && cached.url) {
+      return Promise.resolve({ ...asset, ...cached });
+    }
+
+    const inflightKey = `${documentId}:${asset.id}`;
+    if (!force && this.assetInflight.has(inflightKey)) {
+      return this.assetInflight.get(inflightKey);
+    }
+
+    if (!this.api) {
+      return Promise.reject(new Error('AssetManager API client is not configured.'));
+    }
+
+    const request = this.api
+      .get(`/documents/${documentId}/assets/${asset.id}`)
+      .then(({ data }) => {
+        const entry = {
+          ...asset,
+          ...data,
+          expiresAt: Date.now() + this.assetPresignTtlMs,
+        };
+        this.rememberAsset(entry);
+        return entry;
+      })
+      .finally(() => {
+        this.assetInflight.delete(inflightKey);
+      });
+
+    this.assetInflight.set(inflightKey, request);
+    return request;
+  }
+
+  reset() {
+    this.assetCache.clear();
+    this.assetInflight.clear();
+  }
+}
+
+export default AssetManager;

frontend/src/constants/correspondents.js

@@ -0,0 +1,3 @@
+export const CORRESPONDENT_ROLES = ['sender', 'receiver', 'other'];
+
+export default CORRESPONDENT_ROLES;

frontend/src/correspondents/CorrespondentsPanel.jsx

@@ -0,0 +1,240 @@
+import React, { useCallback, useState } from 'react';
+
+function CorrespondentsPanel({
+  correspondents = [],
+  onRefresh,
+  onCreate,
+  onUpdate,
+  onDelete,
+  onNotify,
+}) {
+  const [editingId, setEditingId] = useState(null);
+  const [draftName, setDraftName] = useState('');
+  const [createName, setCreateName] = useState('');
+  const [saving, setSaving] = useState(false);
+  const [creating, setCreating] = useState(false);
+  const [deletingId, setDeletingId] = useState(null);
+
+  const startEdit = useCallback((correspondent) => {
+    setEditingId(correspondent.id);
+    setDraftName(correspondent.name || '');
+  }, []);
+
+  const cancelEdit = useCallback(() => {
+    setEditingId(null);
+    setDraftName('');
+    setSaving(false);
+  }, []);
+
+  const handleSave = useCallback(async () => {
+    if (!editingId) return;
+    const trimmed = draftName.trim();
+    if (!trimmed) {
+      onNotify?.('Correspondent name cannot be empty.', 'error');
+      return;
+    }
+
+    setSaving(true);
+    try {
+      await onUpdate(editingId, { name: trimmed });
+      cancelEdit();
+    } catch (
+      // eslint-disable-next-line no-empty
+      error
+    ) {}
+  }, [editingId, draftName, onUpdate, cancelEdit, onNotify]);
+
+  const handleDelete = useCallback(
+    async (correspondent) => {
+      if (!correspondent?.id) return;
+      setDeletingId(correspondent.id);
+      try {
+        await onDelete(correspondent.id);
+        if (editingId === correspondent.id) {
+          cancelEdit();
+        }
+      } catch (
+        // eslint-disable-next-line no-empty
+        error
+      ) {
+        return;
+      } finally {
+        setDeletingId(null);
+      }
+    },
+    [onDelete, editingId, cancelEdit],
+  );
+
+  const handleCreate = useCallback(
+    async (event) => {
+      event.preventDefault();
+      const trimmed = createName.trim();
+      if (!trimmed) {
+        onNotify?.('Correspondent name cannot be empty.', 'error');
+        return;
+      }
+      setCreating(true);
+      try {
+        await onCreate({ name: trimmed });
+        setCreateName('');
+      } catch (
+        // eslint-disable-next-line no-empty
+        error
+      ) {
+        return;
+      } finally {
+        setCreating(false);
+      }
+    },
+    [createName, onCreate, onNotify],
+  );
+
+  const handleKeyDown = useCallback(
+    (event) => {
+      if (event.key === 'Enter') {
+        event.preventDefault();
+        handleSave();
+      } else if (event.key === 'Escape') {
+        event.preventDefault();
+        cancelEdit();
+      }
+    },
+    [handleSave, cancelEdit],
+  );
+
+  const renderUsage = useCallback((usage) => {
+    if (!usage) {
+      return '0';
+    }
+    const total = typeof usage.total === 'number' ? usage.total : 0;
+    const entries = usage.by_role ? Object.entries(usage.by_role) : [];
+    if (!entries.length) {
+      return total.toString();
+    }
+    const roleSummary = entries
+      .map(([role, count]) => `${role}: ${count}`)
+      .join(', ');
+    return `${total} (${roleSummary})`;
+  }, []);
+
+  return (
+    <section className="correspondents-panel column">
+      <div className="column-header">
+        <div className="column-header__titles">
+          <h2>Correspondents</h2>
+          <div className="column-subtitle">{correspondents.length} total</div>
+        </div>
+        <div className="header-actions correspondents-actions">
+          <form className="correspondents-actions__form" onSubmit={handleCreate}>
+            <input
+              type="text"
+              placeholder="New correspondent name"
+              value={createName}
+              onChange={(event) => setCreateName(event.target.value)}
+              disabled={creating}
+            />
+            <button type="submit" disabled={creating || !createName.trim()}>
+              {creating ? 'Creating…' : 'Create'}
+            </button>
+          </form>
+          <button
+            className="secondary"
+            type="button"
+            onClick={onRefresh}
+            disabled={saving || creating || Boolean(deletingId)}
+          >
+            Refresh
+          </button>
+        </div>
+      </div>
+      <div className="column-body tags-panel__body">
+        {correspondents.length === 0 ? (
+          <div className="empty-state">No correspondents created yet.</div>
+        ) : (
+          <div className="tags-table">
+            <table>
+              <thead>
+                <tr>
+                  <th scope="col">Name</th>
+                  <th scope="col" className="numeric">
+                    Usage
+                  </th>
+                  <th scope="col" className="actions">
+                    Actions
+                  </th>
+                </tr>
+              </thead>
+              <tbody>
+                {correspondents.map((correspondent) => {
+                  const isEditing = editingId === correspondent.id;
+                  return (
+                    <tr key={correspondent.id} className={isEditing ? 'editing' : ''}>
+                      <td className="tags-table__label">
+                        {isEditing ? (
+                          <input
+                            className="tags-table__label-input"
+                            value={draftName}
+                            onChange={(event) => setDraftName(event.target.value)}
+                            onKeyDown={handleKeyDown}
+                            disabled={saving}
+                            autoFocus
+                          />
+                        ) : (
+                          <span>{correspondent.name}</span>
+                        )}
+                      </td>
+                      <td className="numeric">{renderUsage(correspondent.usage)}</td>
+                      <td className="actions">
+                        {isEditing ? (
+                          <div className="tags-table__edit-controls">
+                            <button
+                              type="button"
+                              className="secondary"
+                              onClick={handleSave}
+                              disabled={saving}
+                            >
+                              Save
+                            </button>
+                            <button
+                              type="button"
+                              className="secondary"
+                              onClick={cancelEdit}
+                              disabled={saving}
+                            >
+                              Cancel
+                            </button>
+                          </div>
+                        ) : (
+                          <div className="tags-table__row-actions">
+                            <button
+                              type="button"
+                              className="secondary"
+                              onClick={() => startEdit(correspondent)}
+                              disabled={deletingId === correspondent.id}
+                            >
+                              Edit
+                            </button>
+                            <button
+                              type="button"
+                              className="danger"
+                              onClick={() => handleDelete(correspondent)}
+                              disabled={deletingId === correspondent.id}
+                            >
+                              Delete
+                            </button>
+                          </div>
+                        )}
+                      </td>
+                    </tr>
+                  );
+                })}
+              </tbody>
+            </table>
+          </div>
+        )}
+      </div>
+    </section>
+  );
+}
+
+export default CorrespondentsPanel;

frontend/src/detail/DetailPanel.jsx

@@ -0,0 +1,926 @@
+import React, { useCallback, useEffect, useMemo, useState } from 'react';
+import { createPortal } from 'react-dom';
+import { DownloadIcon, EditIcon } from '../ui/icons';
+import { getTagColorStyle } from '../utils/colors';
+import { formatFileSize } from '../utils/format';
+import { resolveDocumentAssetUrl } from '../asset_manager';
+import { CORRESPONDENT_ROLES } from '../constants/correspondents';
+
+const MAX_PREVIEW_STACK_ITEMS = 15;
+
+const normalizeRole = (role) => (role || '').toLowerCase();
+
+const formatRoleLabel = (role) => {
+  const normalized = normalizeRole(role);
+  if (!normalized) return 'Other';
+  return normalized.charAt(0).toUpperCase() + normalized.slice(1);
+};
+
+const compareCorrespondents = (a, b) => {
+  const indexA = CORRESPONDENT_ROLES.indexOf(a.role);
+  const indexB = CORRESPONDENT_ROLES.indexOf(b.role);
+  const rankedA = indexA === -1 ? Number.MAX_SAFE_INTEGER : indexA;
+  const rankedB = indexB === -1 ? Number.MAX_SAFE_INTEGER : indexB;
+  if (rankedA !== rankedB) {
+    return rankedA - rankedB;
+  }
+  return (a.name || '').localeCompare(b.name || '');
+};
+
+const sortCorrespondents = (entries = []) =>
+  entries
+    .map((entry) => ({
+      id: entry.id,
+      name: entry.name || '',
+      role: normalizeRole(entry.role),
+    }))
+    .sort(compareCorrespondents);
+
+const CorrespondentPills = ({ entries = [], onRemove, showCount = false }) => (
+  <div className="correspondent-list">
+    {entries.length ? (
+      entries.map((entry) => (
+        <span key={`${entry.id}:${entry.role}`} className="correspondent-pill">
+          <span className="correspondent-pill__label">
+            <strong>{formatRoleLabel(entry.role)}</strong>
+            <span>
+              {entry.name}
+              {showCount && entry.count ? ` (${entry.count})` : ''}
+            </span>
+          </span>
+          {onRemove ? (
+            <button
+              type="button"
+              className="correspondent-pill__remove"
+              onClick={() => onRemove(entry)}
+              aria-label={`Remove ${entry.name} as ${formatRoleLabel(entry.role)}`}
+            >
+              ×
+            </button>
+          ) : null}
+        </span>
+      ))
+    ) : (
+      <span className="meta">No correspondents yet.</span>
+    )}
+  </div>
+);
+
+const TagSection = ({
+  title,
+  tags = [],
+  onRemove,
+  onAdd,
+  emptyMessage = 'No tags yet.',
+  addPlaceholder = 'Add or create tag',
+  addButtonLabel = 'Add',
+  datalistId,
+  datalistOptions = [],
+  className,
+}) => (
+  <div className={className}>
+    <dt>{title}</dt>
+    <div className="tag-list">
+      {tags.length ? (
+        tags.map((tag) => {
+          const key = tag.id ?? tag.label;
+          const style = getTagColorStyle(tag.color);
+          return (
+            <span key={key} className="tag-pill" style={style || undefined}>
+              {tag.label}{' '}
+              {onRemove ? (
+                <button type="button" onClick={() => onRemove(tag)}>
+                  ×
+                </button>
+              ) : null}
+            </span>
+          );
+        })
+      ) : (
+        <span className="meta">{emptyMessage}</span>
+      )}
+    </div>
+    {onAdd ? (
+      <form
+        className="inline"
+        onSubmit={(event) => {
+          event.preventDefault();
+          const input = event.currentTarget.elements.tag;
+          const value = input.value.trim();
+          if (!value) return;
+          onAdd({ value, input });
+        }}
+      >
+        <input name="tag" placeholder={addPlaceholder} list={datalistId} />
+        <button type="submit">{addButtonLabel}</button>
+        {datalistId ? (
+          <datalist id={datalistId}>
+            {datalistOptions.map((option) => (
+              <option key={option.id || option.label || option} value={option.label || option} />
+            ))}
+          </datalist>
+        ) : null}
+      </form>
+    ) : null}
+  </div>
+);
+
+const CorrespondentSection = ({
+  title,
+  entries = [],
+  onRemove,
+  onAdd,
+  showCount = false,
+  addPlaceholder = 'Add or create correspondent',
+  addButtonLabel = 'Add',
+  datalistId,
+  datalistOptions = [],
+  className,
+}) => (
+  <div className={className}>
+    <dt>{title}</dt>
+    <CorrespondentPills entries={entries} onRemove={onRemove} showCount={showCount} />
+    {onAdd ? (
+      <form
+        className="correspondent-form"
+        onSubmit={(event) => {
+          event.preventDefault();
+          const form = event.currentTarget;
+          const nameInput = form.elements.correspondent;
+          const roleSelect = form.elements.role;
+          const value = nameInput.value.trim();
+          const role = roleSelect.value;
+          if (!value) return;
+          onAdd({ name: value, role, input: nameInput });
+          form.reset();
+        }}
+      >
+        <input
+          name="correspondent"
+          placeholder={addPlaceholder}
+          list={datalistId}
+        />
+        <select name="role" defaultValue={CORRESPONDENT_ROLES[0]}>
+          {CORRESPONDENT_ROLES.map((role) => (
+            <option key={role} value={role}>
+              {role.charAt(0).toUpperCase() + role.slice(1)}
+            </option>
+          ))}
+        </select>
+        <button type="submit">{addButtonLabel}</button>
+        {datalistId ? (
+          <datalist id={datalistId}>
+            {datalistOptions.map((name) => (
+              <option key={name} value={name} />
+            ))}
+          </datalist>
+        ) : null}
+      </form>
+    ) : null}
+  </div>
+);
+
+const computeStackAngle = (docId, index) => {
+  if (index === 0) return 0;
+  let hash = 0;
+  const source = docId || `stack-${index}`;
+  for (let i = 0; i < source.length; i += 1) {
+    hash = (hash * 31 + source.charCodeAt(i)) % 997;
+  }
+  const magnitude = Math.max(3, (hash % 13) + 3);
+  const sign = index % 2 === 0 ? 1 : -1;
+  return magnitude * sign;
+};
+
+const PreviewStack = ({
+  items = [],
+  maxItems = MAX_PREVIEW_STACK_ITEMS,
+  emptyMessage = 'Preview unavailable',
+  onItemActivate,
+  onOpenPreview,
+  activeItemId = null,
+}) => {
+  if (!items.length) {
+    return <span className="meta">{emptyMessage}</span>;
+  }
+
+  const limited = items.slice(0, maxItems);
+  const hasMultiple = limited.length > 1;
+  const preparedItems = useMemo(
+    () =>
+      limited.map((entry, index) => ({
+        entry,
+        angle: index === 0 ? 0 : computeStackAngle(entry.id, index),
+      })),
+    [limited],
+  );
+
+  return (
+    <div className="preview-stack preview-stack--stacked">
+      {preparedItems.map(({ entry, angle }, index) => {
+        const transform = hasMultiple
+          ? `translate(-50%, -50%) rotate(${angle}deg)`
+          : 'translate(-50%, -50%)';
+        const isFront = index === 0;
+        return (
+          <div
+            key={entry.id || index}
+            className={`preview-stack__item orientation-${entry.orientation || 'landscape'}`}
+            style={{
+              zIndex: preparedItems.length - index,
+              transform,
+            }}
+            aria-hidden={hasMultiple && !onItemActivate && !onOpenPreview ? 'true' : undefined}
+          >
+            <img
+              src={entry.url}
+              alt={entry.alt || ''}
+              className="preview-stack__image"
+              onClick={(event) => {
+                event.stopPropagation();
+                if (isFront && onOpenPreview) {
+                  onOpenPreview(entry.id);
+                } else if (onItemActivate) {
+                  onItemActivate(entry.id);
+                }
+              }}
+              onKeyDown={(event) => {
+                if (!onItemActivate && !onOpenPreview) return;
+                if (event.key === 'Enter' || event.key === ' ') {
+                  event.preventDefault();
+                  event.stopPropagation();
+                  if (isFront && onOpenPreview) {
+                    onOpenPreview(entry.id);
+                  } else {
+                    onItemActivate?.(entry.id);
+                  }
+                }
+              }}
+            />
+          </div>
+        );
+      })}
+    </div>
+  );
+};
+
+const DetailPanel = ({
+  selectedDocuments = [],
+  tags = [],
+  tagLookupById = new Map(),
+  onTagAdd,
+  onTagRemove,
+  onRegenerateThumbnails,
+  previewEntry,
+  onOpenPreview,
+  onBulkTagAdd,
+  onBulkTagRemove,
+  onBulkReanalyze,
+  onBulkCorrespondentAdd,
+  onBulkCorrespondentRemove,
+  onPromoteSelection,
+  activePreviewId = null,
+  onUpdateTitle = async () => false,
+  ensureAssetUrl = null,
+  getDocumentAsset = () => null,
+  correspondents = [],
+  onCorrespondentAdd,
+  onCorrespondentRemove,
+  resolveApiPath,
+}) => {
+  const selectedCount = selectedDocuments.length;
+  const singleDoc = selectedCount === 1 ? selectedDocuments[0] : null;
+
+  const [titleEditDocId, setTitleEditDocId] = useState(null);
+  const [titleDraft, setTitleDraft] = useState('');
+  const [titleSaving, setTitleSaving] = useState(false);
+  const [titleError, setTitleError] = useState(null);
+  const [ocrOpen, setOcrOpen] = useState(false);
+  const [ocrUrl, setOcrUrl] = useState(null);
+  const [ocrLoading, setOcrLoading] = useState(false);
+  const [ocrError, setOcrError] = useState(null);
+
+  useEffect(() => {
+    if (!singleDoc) {
+      setTitleEditDocId(null);
+      setTitleDraft('');
+      setTitleError(null);
+      setTitleSaving(false);
+      setOcrOpen(false);
+      setOcrLoading(false);
+      setOcrError(null);
+      setOcrUrl(null);
+      return;
+    }
+
+    if (titleEditDocId && titleEditDocId !== singleDoc.id) {
+      setTitleEditDocId(null);
+      setTitleDraft('');
+      setTitleError(null);
+      setTitleSaving(false);
+    }
+  }, [singleDoc, titleEditDocId]);
+
+  useEffect(() => {
+    setOcrOpen(false);
+    setOcrLoading(false);
+    setOcrError(null);
+    setOcrUrl(null);
+  }, [singleDoc?.id]);
+
+  const startTitleEdit = useCallback(() => {
+    if (!singleDoc) return;
+    setTitleEditDocId(singleDoc.id);
+    setTitleDraft(singleDoc.title || singleDoc.original_name || '');
+    setTitleError(null);
+  }, [singleDoc]);
+
+  const cancelTitleEdit = useCallback(() => {
+    setTitleEditDocId(null);
+    setTitleDraft('');
+    setTitleError(null);
+    setTitleSaving(false);
+  }, []);
+
+  const submitTitleEdit = useCallback(
+    async (event) => {
+      event.preventDefault();
+      if (!singleDoc) return;
+      const trimmed = titleDraft.trim();
+      if (!trimmed) {
+        setTitleError('Title cannot be empty.');
+        return;
+      }
+      setTitleSaving(true);
+      try {
+        const ok = await onUpdateTitle(singleDoc.id, trimmed);
+        if (ok) {
+          setTitleEditDocId(null);
+          setTitleDraft('');
+          setTitleError(null);
+        } else {
+          setTitleError('Failed to update title.');
+        }
+      } finally {
+        setTitleSaving(false);
+      }
+    },
+    [singleDoc, titleDraft, onUpdateTitle],
+  );
+
+  const handlePreviewActivate = useCallback(
+    (docId) => {
+      if (!docId) return;
+      onPromoteSelection?.(docId);
+    },
+    [onPromoteSelection],
+  );
+
+  const hasOcrAsset = useMemo(
+    () => Boolean(singleDoc && getDocumentAsset(singleDoc, 'ocr-text')),
+    [singleDoc, getDocumentAsset],
+  );
+
+  const loadOcrUrl = useCallback(async () => {
+    if (!singleDoc) {
+      return;
+    }
+    const asset = getDocumentAsset(singleDoc, 'ocr-text');
+    if (!asset) {
+      setOcrError('No OCR text available for this document.');
+      setOcrUrl(null);
+      return;
+    }
+    setOcrLoading(true);
+    setOcrError(null);
+    try {
+      let entry = asset;
+      let url = entry?.url ||
+        resolveDocumentAssetUrl(singleDoc, 'ocr-text', {
+          ensureAssetUrl,
+          getAsset: getDocumentAsset,
+        });
+      if (!url && typeof ensureAssetUrl === 'function') {
+        const ensured = await ensureAssetUrl(singleDoc.id, asset, { force: false });
+        if (ensured) {
+          entry = ensured;
+        }
+        url = entry?.url ||
+          resolveDocumentAssetUrl(singleDoc, 'ocr-text', {
+            ensureAssetUrl,
+            getAsset: getDocumentAsset,
+          });
+      }
+      if (!url) {
+        throw new Error('OCR text URL is unavailable.');
+      }
+      setOcrUrl(url);
+    } catch (error) {
+      setOcrError(error.message || 'Failed to load OCR text.');
+      setOcrUrl(null);
+    } finally {
+      setOcrLoading(false);
+    }
+  }, [singleDoc, ensureAssetUrl, getDocumentAsset]);
+
+  const openOcrModal = useCallback(() => {
+    if (!singleDoc) {
+      return;
+    }
+    setOcrOpen(true);
+    loadOcrUrl();
+  }, [singleDoc, loadOcrUrl]);
+
+  const closeOcrModal = useCallback(() => {
+    setOcrOpen(false);
+  }, []);
+
+  const makePreviewItem = useCallback(
+    (doc) => {
+      if (!doc) return null;
+      const url = resolveDocumentAssetUrl(doc, 'preview', {
+        ensureAssetUrl,
+        getAsset: getDocumentAsset,
+      });
+      if (!url) {
+        return null;
+      }
+      const asset = getDocumentAsset(doc, 'preview');
+      const width = Number(asset?.metadata?.width) || 0;
+      const height = Number(asset?.metadata?.height) || 0;
+      const orientation = width > 0 && height > 0 ? (width >= height ? 'landscape' : 'portrait') : 'landscape';
+      return {
+        id: doc.id,
+        url,
+        orientation,
+        alt: doc.title || doc.original_name || 'Document preview',
+      };
+    },
+    [ensureAssetUrl, getDocumentAsset],
+  );
+
+  const stackDocuments = useMemo(() => {
+    if (!selectedDocuments.length) return [];
+    const seen = new Set();
+    const ordered = [];
+    for (let index = selectedDocuments.length - 1; index >= 0; index -= 1) {
+      const doc = selectedDocuments[index];
+      if (!doc?.id || seen.has(doc.id)) continue;
+      seen.add(doc.id);
+      ordered.push(doc);
+      if (ordered.length >= MAX_PREVIEW_STACK_ITEMS) {
+        break;
+      }
+    }
+    return ordered;
+  }, [selectedDocuments]);
+
+  const singlePreviewItems = useMemo(() => {
+    if (!singleDoc) return [];
+    const item = makePreviewItem(singleDoc);
+    return item ? [item] : [];
+  }, [singleDoc, makePreviewItem]);
+
+  const stackPreviews = useMemo(
+    () =>
+      stackDocuments
+        .map((doc) => makePreviewItem(doc))
+        .filter(Boolean),
+    [stackDocuments, makePreviewItem],
+  );
+
+  useEffect(() => {
+    if (!ensureAssetUrl) {
+      return;
+    }
+
+    stackDocuments.forEach((doc) => {
+      resolveDocumentAssetUrl(doc, 'preview', {
+        ensureAssetUrl,
+        getAsset: getDocumentAsset,
+      });
+    });
+  }, [stackDocuments, ensureAssetUrl, getDocumentAsset]);
+
+  const bulkTagUnion = useMemo(() => {
+    if (!selectedDocuments.length) return [];
+    const tagMap = new Map();
+    selectedDocuments.forEach((doc) => {
+      (doc.tags || []).forEach((tag) => {
+        const label = (tag?.label || '').trim();
+        if (!label) return;
+        if (!tagMap.has(label)) {
+          const fallback = tagLookupById.get(tag.id) || {};
+          tagMap.set(label, {
+            id: tag.id,
+            label,
+            color: tag.color || fallback.color,
+          });
+        }
+      });
+    });
+    return [...tagMap.values()].sort((a, b) => a.label.localeCompare(b.label));
+  }, [selectedDocuments, tagLookupById]);
+
+  const stackTotalSizeBytes = useMemo(() => {
+    if (!stackPreviews.length) return 0;
+    const byId = new Map(selectedDocuments.map((doc) => [doc.id, doc]));
+    return stackPreviews.reduce((sum, item) => {
+      const source = byId.get(item.id);
+      const bytes = source?.current_version?.size_bytes;
+      return sum + (typeof bytes === 'number' ? bytes : 0);
+    }, 0);
+  }, [stackPreviews, selectedDocuments]);
+
+  const availableCorrespondents = useMemo(
+    () => (Array.isArray(correspondents) ? correspondents : []),
+    [correspondents],
+  );
+
+  const correspondentOptions = useMemo(() => {
+    const seen = new Set();
+    return availableCorrespondents
+      .map((entry) => (entry?.name || '').trim())
+      .filter((name) => {
+        if (!name) return false;
+        const lower = name.toLowerCase();
+        if (seen.has(lower)) {
+          return false;
+        }
+        seen.add(lower);
+        return true;
+      });
+  }, [availableCorrespondents]);
+
+  const singleCorrespondents = useMemo(() => {
+    if (!singleDoc) return [];
+    return sortCorrespondents(singleDoc.correspondents || []);
+  }, [singleDoc]);
+
+  const bulkCorrespondents = useMemo(() => {
+    if (selectedDocuments.length <= 1) {
+      const doc = selectedDocuments[0];
+      return doc ? sortCorrespondents(doc.correspondents || []) : [];
+    }
+
+    const map = new Map();
+    selectedDocuments.forEach((doc) => {
+      if (!doc?.id) return;
+      (doc.correspondents || []).forEach((entry) => {
+        if (!entry?.id) return;
+        const normalizedRole = normalizeRole(entry.role);
+        const key = `${entry.id}:${normalizedRole}`;
+        if (!map.has(key)) {
+          map.set(key, {
+            id: entry.id,
+            name: entry.name || '',
+            role: normalizedRole,
+            documentIds: new Set(),
+          });
+        }
+        map.get(key).documentIds.add(doc.id);
+      });
+    });
+
+    return [...map.values()]
+      .map((entry) => ({
+        id: entry.id,
+        name: entry.name,
+        role: entry.role,
+        documentIds: [...entry.documentIds],
+        count: entry.documentIds.size,
+      }))
+      .sort(compareCorrespondents);
+  }, [selectedDocuments]);
+
+  const handleBulkCorrespondentRemove = useCallback(
+    (entry) => {
+      if (!entry?.id) return;
+      const normalizedRole = normalizeRole(entry.role);
+      if (onBulkCorrespondentRemove) {
+        return onBulkCorrespondentRemove({
+          assignments: [
+            {
+              correspondent_id: entry.id,
+              role: normalizedRole,
+            },
+          ],
+          documentIds: entry.documentIds,
+        });
+      }
+
+      if (!onCorrespondentRemove) return;
+      const targets = entry.documentIds && entry.documentIds.length
+        ? entry.documentIds
+        : selectedDocuments
+            .filter((doc) =>
+              (doc.correspondents || []).some(
+                (item) => item.id === entry.id && normalizeRole(item.role) === normalizedRole,
+              ),
+            )
+            .map((doc) => doc.id);
+
+      return Promise.all(
+        targets.map((documentId) =>
+          onCorrespondentRemove({
+            documentId,
+            correspondentId: entry.id,
+            role: normalizedRole,
+          }),
+        ),
+      ).catch(() => {});
+    },
+    [bulkCorrespondents, onBulkCorrespondentRemove, onCorrespondentRemove, selectedDocuments],
+  );
+
+  const renderSingle = () => {
+    if (!singleDoc) {
+      return <p className="meta">Select a document to view metadata, tags and actions.</p>;
+    }
+
+    const displayName = singleDoc.title || singleDoc.original_name;
+    const downloadHref = singleDoc.current_version?.download_path
+      ? resolveApiPath?.(singleDoc.current_version.download_path)
+      : null;
+    const isEditingTitle = titleEditDocId === singleDoc.id;
+    const sizeBytes = Number(singleDoc.current_version?.size_bytes) || 0;
+    const sizeLabel = sizeBytes > 0 ? formatFileSize(sizeBytes) : '—';
+    const issuedAt = singleDoc.issued_at
+      ? new Date(singleDoc.issued_at).toLocaleString()
+      : '—';
+    const tagsForDoc = Array.isArray(singleDoc.tags) ? singleDoc.tags : [];
+    const metadata =
+      singleDoc.metadata && Object.keys(singleDoc.metadata).length > 0 ? singleDoc.metadata : null;
+    return (
+      <>
+        <div>
+          <div className="preview-pane preview-pane--stack">
+            <PreviewStack
+              items={singlePreviewItems}
+              maxItems={1}
+              emptyMessage="Preview loading…"
+              onItemActivate={handlePreviewActivate}
+              onOpenPreview={onOpenPreview}
+              activeItemId={activePreviewId}
+            />
+          </div>
+        </div>
+        <div className="doc-title-row">
+          {isEditingTitle ? (
+            <form className="doc-title-edit" onSubmit={submitTitleEdit}>
+              <input
+                value={titleDraft}
+                onChange={(event) => {
+                  setTitleDraft(event.target.value);
+                  if (titleError) {
+                    setTitleError(null);
+                  }
+                }}
+                onKeyDown={(event) => {
+                  if (event.key === 'Escape') {
+                    event.preventDefault();
+                    cancelTitleEdit();
+                  }
+                }}
+                aria-label="Document title"
+                autoFocus
+              />
+              <button type="submit" disabled={titleSaving}>
+                Save
+              </button>
+              <button
+                type="button"
+                className="secondary"
+                onClick={cancelTitleEdit}
+                disabled={titleSaving}
+              >
+                Cancel
+              </button>
+            </form>
+          ) : (
+            <>
+              <h3 style={{ margin: 0 }}>{displayName}</h3>
+              <button
+                type="button"
+                className="icon-button ghost"
+                onClick={startTitleEdit}
+                aria-label="Edit title"
+                title="Edit title"
+              >
+                <EditIcon className="icon-inline" />
+              </button>
+            </>
+          )}
+        </div>
+        {titleError ? <div className="status-inline error">{titleError}</div> : null}
+        <div className="meta">
+          <div>
+            <strong>Uploaded:</strong>{' '}
+            {singleDoc.uploaded_at ? new Date(singleDoc.uploaded_at).toLocaleString() : '—'}
+          </div>
+          <div>
+            <strong>Size:</strong>{' '}
+            {sizeLabel}
+          </div>
+          <div>
+            <strong>Type:</strong> {singleDoc.content_type || 'Unknown'}
+          </div>
+          <div>
+            <strong>Issued:</strong> {issuedAt}
+          </div>
+          <div>
+            <strong>Original filename:</strong>{' '}
+            {singleDoc.original_name}
+          </div>
+        </div>
+        <div className="detail-actions">
+          <a
+            className="button-link with-icon"
+            href={downloadHref || '#'}
+            target="_blank"
+            rel="noopener noreferrer"
+            aria-disabled={!downloadHref}
+            onClick={(event) => {
+              if (!downloadHref) {
+                event.preventDefault();
+              }
+            }}
+          >
+            <DownloadIcon className="icon-inline" />
+            <span>Download</span>
+          </a>
+          <button
+            type="button"
+            className="secondary"
+            onClick={() => onOpenPreview(singleDoc.id)}
+          >
+            Open preview
+          </button>
+        <button
+          type="button"
+          className="secondary"
+          onClick={() => onRegenerateThumbnails(singleDoc.id)}
+        >
+          Re-run analysis
+        </button>
+        </div>
+        {hasOcrAsset ? (
+          <div className="detail-ocr-trigger">
+            <button type="button" className="secondary" onClick={openOcrModal}>
+              View OCR text
+            </button>
+          </div>
+        ) : null}
+        <TagSection
+          title="Tags"
+          tags={tagsForDoc.map((tag) => ({
+            id: tag.id,
+            label: tag.label,
+            color: tag.color || tagLookupById.get(tag.id)?.color,
+          }))}
+          onRemove={(tag) => onTagRemove(singleDoc.id, tag.id)}
+          onAdd={({ value, input }) => onTagAdd(singleDoc, value, input)}
+          datalistId="tag-catalog-single"
+          datalistOptions={tags}
+        />
+        <CorrespondentSection
+          title="Correspondents"
+          entries={singleCorrespondents}
+          onRemove={(entry) =>
+            onCorrespondentRemove?.({
+              documentId: singleDoc.id,
+              correspondentId: entry.id,
+              role: entry.role,
+            })
+          }
+          onAdd={({ name, role, input }) =>
+            onCorrespondentAdd?.({
+              document: singleDoc,
+              name,
+              role,
+              input,
+            })
+          }
+          datalistId="correspondent-catalog-single"
+          datalistOptions={correspondentOptions}
+        />
+        {metadata && (
+          <div>
+            <dt>Metadata</dt>
+            <pre>{JSON.stringify(metadata, null, 2)}</pre>
+          </div>
+        )}
+        {hasOcrAsset && ocrOpen
+          ? createPortal(
+              <div className="modal-backdrop" role="presentation" onClick={closeOcrModal}>
+                <div
+                  className="modal modal--ocr"
+                  role="dialog"
+                  aria-modal="true"
+                  aria-label="OCR text"
+                  onClick={(event) => event.stopPropagation()}
+                >
+                  <div className="modal__header">
+                    <h3>OCR Text</h3>
+                    <button
+                      type="button"
+                      className="icon-button ghost"
+                      onClick={closeOcrModal}
+                      aria-label="Close OCR text"
+                    >
+                      ×
+                    </button>
+                  </div>
+                  <div className="modal__body detail-ocr__content">
+                    {ocrLoading ? (
+                      <div className="meta">Loading OCR text…</div>
+                    ) : ocrError ? (
+                      <div className="status-inline error">{ocrError}</div>
+                    ) : ocrUrl ? (
+                      <iframe
+                        title="OCR text"
+                        src={ocrUrl}
+                        className="detail-ocr__frame"
+                      />
+                    ) : (
+                      <div className="meta">OCR text empty.</div>
+                    )}
+                  </div>
+                </div>
+              </div>,
+              document.body,
+            )
+          : null}
+      </>
+    );
+  };
+
+  const renderBulk = () => {
+    const countLabel = `${selectedCount} document${selectedCount === 1 ? '' : 's'}`;
+    const sizeLabel = stackTotalSizeBytes ? formatFileSize(stackTotalSizeBytes) : '—';
+
+    return (
+      <>
+        <div>
+          <div className="preview-pane preview-pane--stack">
+            <PreviewStack
+              items={stackPreviews}
+              emptyMessage="No previews available."
+              onItemActivate={handlePreviewActivate}
+              onOpenPreview={onOpenPreview}
+              activeItemId={activePreviewId}
+            />
+          </div>
+        </div>
+        <h3 style={{ margin: 0 }}>{countLabel}</h3>
+        <div className="meta">
+          <div>
+            <strong>Total size (stack):</strong> {sizeLabel}
+          </div>
+        </div>
+        <TagSection
+          title="Tags"
+          tags={bulkTagUnion}
+          emptyMessage="No tags assigned."
+          onRemove={(tag) => onBulkTagRemove?.({ label: tag.label })}
+          onAdd={({ value, input }) => onBulkTagAdd?.({ label: value, input })}
+          addPlaceholder="Add tag to selection"
+          addButtonLabel="Add tag"
+          datalistId="tag-catalog-bulk"
+          datalistOptions={tags}
+          className="bulk-tags"
+        />
+        <CorrespondentSection
+          title="Correspondents"
+          entries={bulkCorrespondents}
+          onRemove={handleBulkCorrespondentRemove}
+          onAdd={({ name, role, input }) =>
+            onBulkCorrespondentAdd?.({ name, role, input })
+          }
+          addPlaceholder="Add correspondent to selection"
+          datalistId="correspondent-catalog-bulk"
+          datalistOptions={correspondentOptions}
+          showCount
+          className="bulk-correspondents"
+        />
+        <button
+          type="button"
+          className="secondary"
+          onClick={() => onBulkReanalyze?.()}
+        >
+          Re-analyze selection
+        </button>
+      </>
+    );
+  };
+
+  return (
+    <aside className="detail-panel column">
+      <div className="column-body scrollable">
+        {selectedCount <= 1 ? renderSingle() : renderBulk()}
+      </div>
+    </aside>
+  );
+};
+
+export default DetailPanel;

frontend/src/documents/DocumentsTable.jsx

@@ -0,0 +1,786 @@
+import React, { useCallback, useEffect, useMemo, useRef } from 'react';
+import { resolveDocumentAssetUrl } from '../asset_manager';
+import { getTagColorStyle } from '../utils/colors';
+import { DownloadIcon, EditIcon, ViewListIcon, ViewGridIcon } from '../ui/icons';
+
+const FOLDER_ICON_SRC = '/folder.svg';
+
+const TAG_MIME_TYPES = ['application/x-papercrate-tag', 'text/papercrate-tag'];
+
+const DocumentThumbnailImage = ({ document, ensureAssetUrl, getDocumentAsset, alt }) => {
+  const url = useMemo(
+    () =>
+      resolveDocumentAssetUrl(document, 'thumbnail', {
+        ensureAssetUrl,
+        getAsset: getDocumentAsset,
+      }),
+    [document, ensureAssetUrl, getDocumentAsset],
+  );
+
+  return (
+    <div className="document-thumbnail-wrapper">
+      {url ? (
+        <img
+          src={url}
+          alt={alt || ''}
+          className="document-thumbnail"
+          draggable={false}
+          onDragStart={(event) => event.preventDefault()}
+        />
+      ) : (
+        <div className="thumb-placeholder">DOC</div>
+      )}
+    </div>
+  );
+};
+
+const DocumentsTable = ({
+  currentFolderName,
+  breadcrumbs,
+  onRefresh,
+  onShowSkeuoWorkspace = () => {},
+  onRequestCreateFolder,
+  creatingFolder = false,
+  subfolders,
+  documents,
+  searchResults,
+  isFilterActive,
+  onFolderSelect,
+  onFolderDrop,
+  onFolderDragOver,
+  onFolderDragLeave,
+  onFolderDragStart,
+  onFolderDragEnd,
+  draggedFolderId,
+  onFolderDelete,
+  selectedFolderIds = [],
+  onFolderRowClick,
+  onDocumentRowClick,
+  onDocumentOpen,
+  selectedDocumentIds,
+  focusedDocumentId,
+  focusedRowKey,
+  draggingDocumentIds = [],
+  onDocumentDragStart,
+  onDocumentDragEnd,
+  onDocumentDelete,
+  onFolderRename,
+  onDocumentRename,
+  tagLookupById,
+  onDocumentListFocus,
+  onDocumentListKeyDown,
+  onFocusedRowChange,
+  ensureAssetUrl = null,
+  getDocumentAsset = () => null,
+  getDownloadHref,
+  onTagClick,
+  isSearchLoading = false,
+  onDocumentTagDrop,
+  viewMode = 'list',
+  onViewModeChange,
+  onClearSelection,
+}) => {
+  const showingSearchResults = searchResults !== null;
+  const rows = showingSearchResults ? searchResults : documents;
+
+  const selectedSet = useMemo(
+    () => new Set(selectedDocumentIds),
+    [selectedDocumentIds],
+  );
+  const selectedFolderSet = useMemo(
+    () => new Set(selectedFolderIds || []),
+    [selectedFolderIds],
+  );
+  const draggingSet = useMemo(
+    () => new Set(draggingDocumentIds || []),
+    [draggingDocumentIds],
+  );
+  const scrollRef = useRef(null);
+  const isGridView = viewMode === 'grid';
+  const handleSetViewMode = useCallback(
+    (nextMode) => {
+      if (!onViewModeChange) {
+        return;
+      }
+      onViewModeChange(nextMode);
+      if (scrollRef.current) {
+        scrollRef.current.scrollTop = 0;
+      }
+    },
+    [onViewModeChange],
+  );
+  const isTagDragEvent = useCallback((event) => {
+    const types = Array.from(event.dataTransfer?.types || []);
+    return TAG_MIME_TYPES.some((type) => types.includes(type));
+  }, []);
+  const ensureFocusedRowVisible = useCallback(() => {
+    if (!focusedRowKey) return;
+    const container = scrollRef.current;
+    if (!container) return;
+    let selector = null;
+    if (focusedRowKey.startsWith('document:')) {
+      selector = `#document-row-${focusedRowKey.slice('document:'.length)}`;
+    } else if (focusedRowKey.startsWith('folder:')) {
+      selector = `#folder-row-${focusedRowKey.slice('folder:'.length)}`;
+    }
+    if (!selector) {
+      return;
+    }
+    const row = container.querySelector(selector);
+    if (!row || !container.contains(row)) {
+      return;
+    }
+
+    const header = container.querySelector('thead');
+    const headerHeight = header ? header.getBoundingClientRect().height : 0;
+    const rowTop = row.offsetTop;
+    const rowBottom = rowTop + row.offsetHeight;
+    const visibleTop = container.scrollTop + headerHeight;
+    const visibleBottom = container.scrollTop + container.clientHeight;
+
+    if (rowTop < visibleTop) {
+      container.scrollTop = Math.max(rowTop - headerHeight, 0);
+      return;
+    }
+
+    if (rowBottom > visibleBottom) {
+      const nextScrollTop = rowBottom - container.clientHeight;
+      container.scrollTop = Math.max(nextScrollTop, 0);
+    }
+  }, [focusedRowKey]);
+
+  useEffect(() => {
+    ensureFocusedRowVisible();
+  }, [ensureFocusedRowVisible]);
+
+  const activeDescendantId = useMemo(() => {
+    if (!focusedRowKey) return undefined;
+    if (focusedRowKey.startsWith('document:')) {
+      return `document-row-${focusedRowKey.slice('document:'.length)}`;
+    }
+    if (focusedRowKey.startsWith('folder:')) {
+      return `folder-row-${focusedRowKey.slice('folder:'.length)}`;
+    }
+    return undefined;
+  }, [focusedRowKey]);
+
+  const handleDocumentTagDragOver = useCallback(
+    (event) => {
+      if (!isTagDragEvent(event)) {
+        return;
+      }
+      event.preventDefault();
+      event.dataTransfer.dropEffect = 'copy';
+      event.currentTarget.classList.add('tag-drop-target');
+    },
+    [isTagDragEvent],
+  );
+
+  const handleDocumentTagDragLeave = useCallback(
+    (event) => {
+      if (!isTagDragEvent(event)) {
+        return;
+      }
+      if (event.relatedTarget && event.currentTarget.contains(event.relatedTarget)) {
+        return;
+      }
+      event.currentTarget.classList.remove('tag-drop-target');
+    },
+    [isTagDragEvent],
+  );
+
+  const handleDocumentTagDrop = useCallback(
+    (event, documentId) => {
+      if (!isTagDragEvent(event)) {
+        return;
+      }
+      event.preventDefault();
+      event.stopPropagation();
+      event.currentTarget.classList.remove('tag-drop-target');
+      const payload =
+        event.dataTransfer.getData('application/x-papercrate-tag') ||
+        event.dataTransfer.getData('text/papercrate-tag');
+      if (!payload) {
+        return;
+      }
+      try {
+        const parsed = JSON.parse(payload);
+        if (parsed?.id && onDocumentTagDrop) {
+          onDocumentTagDrop(documentId, parsed);
+        }
+      } catch (
+        // eslint-disable-next-line no-empty
+        error
+      ) {}
+    },
+    [isTagDragEvent, onDocumentTagDrop],
+  );
+
+  const handleGridBackgroundClick = useCallback(
+    (event) => {
+      if (event.target !== event.currentTarget) {
+        return;
+      }
+      onClearSelection?.();
+    },
+    [onClearSelection],
+  );
+
+  return (
+    <section
+      className={`documents-panel column documents-panel--view-${isGridView ? 'grid' : 'list'}`}
+    >
+      <div className="column-header">
+        <div className="column-header__titles">
+          <nav className="breadcrumb" aria-label="Folder breadcrumbs">
+            {breadcrumbs.map((crumb, index) => {
+              const isLast = index === breadcrumbs.length - 1;
+              return (
+                <span key={crumb.id} className="breadcrumb-item">
+                  {isLast ? (
+                    <span className="breadcrumb-current">{crumb.name}</span>
+                  ) : (
+                    <a
+                      href="#"
+                      onClick={(event) => {
+                        event.preventDefault();
+                        onFolderSelect(crumb.id);
+                      }}
+                    >
+                      {crumb.name}
+                    </a>
+                  )}
+                  {!isLast && <span className="breadcrumb-separator">›</span>}
+                </span>
+              );
+            })}
+          </nav>
+          {showingSearchResults && (
+            <div className="column-subtitle">Search results</div>
+          )}
+        </div>
+        <div className="header-actions">
+          <div className="view-toggle" role="group" aria-label="Change view">
+            <button
+              type="button"
+              className={`view-toggle__button${isGridView ? '' : ' active'}`}
+              onClick={() => handleSetViewMode('list')}
+              aria-pressed={!isGridView}
+              title="List view"
+            >
+              <ViewListIcon className="view-toggle__icon" size={18} />
+            </button>
+            <button
+              type="button"
+              className={`view-toggle__button${isGridView ? ' active' : ''}`}
+              onClick={() => handleSetViewMode('grid')}
+              aria-pressed={isGridView}
+              title="Icons view"
+            >
+              <ViewGridIcon className="view-toggle__icon" size={18} />
+            </button>
+          </div>
+          <button
+            type="button"
+            onClick={onRequestCreateFolder}
+            disabled={creatingFolder}
+          >
+            {creatingFolder ? 'Creating…' : 'New folder'}
+          </button>
+          <button className="secondary" onClick={onRefresh}>
+            Refresh
+          </button>
+          <button className="secondary" type="button" onClick={onShowSkeuoWorkspace}>
+            Desk View
+          </button>
+        </div>
+      </div>
+      <div className="column-body">
+        <div
+          ref={scrollRef}
+          className="documents-scroll"
+          tabIndex={0}
+          onFocus={(event) => {
+            if (event.target === scrollRef.current) {
+              onDocumentListFocus?.();
+            }
+          }}
+          onKeyDown={(event) => {
+            if (event.target !== scrollRef.current) {
+              return;
+            }
+            if (onDocumentListKeyDown) {
+              onDocumentListKeyDown(event);
+            }
+          }}
+          aria-activedescendant={isGridView ? undefined : activeDescendantId}
+        >
+          {!showingSearchResults && !subfolders.length && rows.length === 0 ? (
+            <div className="empty-state">
+              Drop files anywhere or onto a folder to upload documents.
+            </div>
+          ) : isGridView ? (
+            <div
+              className="documents-grid"
+              role="list"
+              onClick={handleGridBackgroundClick}
+            >
+              {!showingSearchResults &&
+                subfolders.map((folder) => {
+                  const canDragFolder = folder.id !== 'root';
+                  const isDraggingFolder = draggedFolderId === folder.id;
+                  const isSelectedFolder = selectedFolderSet.has(folder.id);
+                  const classes = ['document-card', 'folder-card'];
+                  if (isDraggingFolder) classes.push('is-dragging');
+                  if (isSelectedFolder) classes.push('selected');
+                  return (
+                    <div
+                      key={folder.id}
+                      className={classes.join(' ')}
+                      role="listitem"
+                      id={`folder-card-${folder.id}`}
+                      draggable={canDragFolder}
+                      onClick={(event) => {
+                        onFolderRowClick?.(folder.id, event);
+                        const shouldNavigate =
+                          !event.defaultPrevented &&
+                          !event.metaKey &&
+                          !event.ctrlKey &&
+                          !event.shiftKey;
+                        if (shouldNavigate) {
+                          onFolderSelect(folder.id);
+                        }
+                      }}
+                      onDoubleClick={(event) => {
+                        event.preventDefault();
+                        onFolderSelect(folder.id);
+                      }}
+                      onDragOver={(event) => onFolderDragOver(event, folder.id)}
+                      onDragLeave={onFolderDragLeave}
+                      onDrop={(event) => onFolderDrop(event, folder.id)}
+                      onDragStart={(event) => {
+                        if (canDragFolder) {
+                          onFolderDragStart(event, folder.id);
+                        }
+                      }}
+                      onDragEnd={(event) => {
+                        if (canDragFolder) {
+                          onFolderDragEnd(event);
+                        }
+                      }}
+                    >
+                      <div className="folder-card__icon">
+                        <img
+                          src={FOLDER_ICON_SRC}
+                          alt="Folder"
+                          className="folder-card__icon-svg"
+                        />
+                      </div>
+                      <div className="folder-card__meta">
+                        <div className="folder-card__name" title={folder.name}>
+                          {folder.name}
+                        </div>
+                      </div>
+                    </div>
+                  );
+                })}
+              {rows.map((doc) => {
+                const isSelected = selectedSet.has(doc.id);
+                const isDraggingDoc = draggingSet.has(doc.id);
+                const tagList = Array.isArray(doc.tags) ? doc.tags : [];
+                const visibleTags = tagList.slice(0, 3);
+                const remainingTagCount = tagList.length > 3 ? tagList.length - 3 : 0;
+                const cardClasses = ['document-card', 'document'];
+                if (isSelected) cardClasses.push('selected');
+                if (isDraggingDoc) cardClasses.push('is-dragging');
+                return (
+                  <div
+                    key={doc.id}
+                    className={cardClasses.join(' ')}
+                    role="listitem"
+                    id={`document-card-${doc.id}`}
+                    onClick={(event) => onDocumentRowClick(doc.id, event)}
+                    onDoubleClick={() => onDocumentOpen(doc.id)}
+                    draggable
+                    onDragStart={(event) => onDocumentDragStart(event, doc)}
+                    onDragEnd={onDocumentDragEnd}
+                    onDragOver={(event) => handleDocumentTagDragOver(event)}
+                    onDragOverCapture={(event) => handleDocumentTagDragOver(event)}
+                    onDragLeave={handleDocumentTagDragLeave}
+                    onDragLeaveCapture={handleDocumentTagDragLeave}
+                    onDrop={(event) => handleDocumentTagDrop(event, doc.id)}
+                    onDropCapture={(event) => handleDocumentTagDrop(event, doc.id)}
+                  >
+                    <DocumentThumbnailImage
+                      document={doc}
+                      ensureAssetUrl={ensureAssetUrl}
+                      getDocumentAsset={getDocumentAsset}
+                      alt={`Thumbnail for ${doc.title || doc.original_name}`}
+                    />
+                    <div className="document-card__meta">
+                      <div
+                        className="document-card__title"
+                        title={doc.title || doc.original_name}
+                      >
+                        {doc.title || doc.original_name}
+                      </div>
+                      {visibleTags.length > 0 && (
+                        <div className="document-card__tags">
+                          {visibleTags.map((tag) => {
+                            const colorSource = tag?.color || tagLookupById?.get(tag.id)?.color;
+                            const style = getTagColorStyle(colorSource);
+                            return (
+                              <span
+                                key={tag.id}
+                                className="badge tag-chip"
+                                style={style || undefined}
+                                title={tag.label}
+                                onClick={(event) => {
+                                  event.stopPropagation();
+                                  if (onTagClick) {
+                                    onTagClick(tag.id);
+                                  }
+                                }}
+                                role="button"
+                                tabIndex={0}
+                                draggable
+                                onDragStart={(event) => {
+                                  event.stopPropagation();
+                                  try {
+                                    if (event.dataTransfer) {
+                                      event.dataTransfer.effectAllowed = 'copyMove';
+                                    }
+                                    const payload = JSON.stringify({
+                                      id: tag.id,
+                                      label: tag.label,
+                                      sourceDocId: doc.id,
+                                    });
+                                    event.dataTransfer?.setData('application/x-papercrate-tag', payload);
+                                    event.dataTransfer?.setData('text/papercrate-tag', payload);
+                                    event.dataTransfer?.setData('text/plain', tag.label || 'Tag');
+                                  } catch (
+                                    // eslint-disable-next-line no-empty
+                                    error
+                                  ) {}
+                                }}
+                                onDragEnd={(event) => {
+                                  event.stopPropagation();
+                                }}
+                                onKeyDown={(event) => {
+                                  if (event.key === 'Enter' || event.key === ' ') {
+                                    event.preventDefault();
+                                    event.stopPropagation();
+                                    if (onTagClick) {
+                                      onTagClick(tag.id);
+                                    }
+                                  }
+                                }}
+                              >
+                                {tag.label}
+                              </span>
+                            );
+                          })}
+                          {remainingTagCount > 0 && (
+                            <span className="badge tag-chip tag-chip--more">+{remainingTagCount}</span>
+                          )}
+                        </div>
+                      )}
+                    </div>
+                  </div>
+                );
+              })}
+            </div>
+          ) : (
+            <table aria-multiselectable="true">
+              <thead>
+                <tr>
+                  <th className="thumb-column">Preview</th>
+                  <th>Name</th>
+                  <th>Type</th>
+                  <th>Updated</th>
+                  <th className="actions-column">Actions</th>
+                </tr>
+              </thead>
+              <tbody>
+                {!showingSearchResults &&
+                  subfolders.map((folder) => {
+                    const canDragFolder = folder.id !== 'root';
+                    const isDraggingFolder = draggedFolderId === folder.id;
+                    const isSelectedFolder = selectedFolderSet.has(folder.id);
+                    return (
+                      <tr
+                        key={folder.id}
+                        className={`folder${isDraggingFolder ? ' is-dragging' : ''}${
+                          focusedRowKey === `folder:${folder.id}` ? ' focused' : ''
+                        }${isSelectedFolder ? ' selected' : ''}`}
+                        id={`folder-row-${folder.id}`}
+                        onClick={(event) => {
+                          onFolderRowClick?.(folder.id, event);
+                          const shouldNavigate =
+                            !event.defaultPrevented &&
+                            !event.metaKey &&
+                            !event.ctrlKey &&
+                            !event.shiftKey;
+                          if (shouldNavigate) {
+                            onFolderSelect(folder.id);
+                          }
+                          if (scrollRef.current) {
+                            scrollRef.current.focus({ preventScroll: true });
+                          }
+                          onFocusedRowChange?.(`folder:${folder.id}`);
+                        }}
+                        onDoubleClick={(event) => {
+                          event.preventDefault();
+                          onFolderSelect(folder.id);
+                        }}
+                        onDragOver={(event) => onFolderDragOver(event, folder.id)}
+                        onDragLeave={onFolderDragLeave}
+                        onDrop={(event) => onFolderDrop(event, folder.id)}
+                        draggable={canDragFolder}
+                        onDragStart={(event) => {
+                          if (canDragFolder) {
+                            onFolderDragStart(event, folder.id);
+                          }
+                        }}
+                        onDragEnd={(event) => {
+                          if (canDragFolder) {
+                            onFolderDragEnd(event);
+                          }
+                        }}
+                      >
+                        <td className="thumb-cell">
+                          <div className="thumb-icon">
+                            <img
+                              src={FOLDER_ICON_SRC}
+                              alt="Folder"
+                              className="thumb-icon__image"
+                            />
+                          </div>
+                        </td>
+                        <td className="doc-list__name">
+                          <div className="doc-list__name-content">
+                            <span>{folder.name}</span>
+                            {folder.id !== 'root' && (
+                              <button
+                                type="button"
+                                className="icon-button ghost doc-list__icon-button"
+                                onClick={(event) => {
+                                  event.stopPropagation();
+                                  if (!onFolderRename) return;
+                                  const nextName = window.prompt('Rename folder', folder.name || '');
+                                  if (!nextName) {
+                                    return;
+                                  }
+                                  const trimmed = nextName.trim();
+                                  if (!trimmed || trimmed === folder.name) {
+                                    return;
+                                  }
+                                  onFolderRename(folder.id, trimmed);
+                                }}
+                                title="Rename folder"
+                                aria-label={`Rename folder ${folder.name}`}
+                              >
+                                <EditIcon className="doc-list__icon" size={16} />
+                              </button>
+                            )}
+                          </div>
+                        </td>
+                        <td>Folder</td>
+                        <td>—</td>
+                        <td className="actions">
+                          <button
+                            type="button"
+                            className="icon-button danger"
+                            onClick={(event) => {
+                              event.stopPropagation();
+                              onFolderDelete(folder.id);
+                            }}
+                          >
+                            Delete
+                          </button>
+                        </td>
+                      </tr>
+                    );
+                  })}
+                {rows.map((doc) => {
+                  const isSelected = selectedSet.has(doc.id);
+                  const isDraggingDoc = draggingSet.has(doc.id);
+                  const rowClasses = ['document'];
+                  if (isSelected) rowClasses.push('selected');
+                  if (isDraggingDoc) rowClasses.push('is-dragging');
+                  const downloadHref = getDownloadHref?.(doc) || null;
+
+                  return (
+                    <tr
+                      key={doc.id}
+                      className={rowClasses.join(' ')}
+                      id={`document-row-${doc.id}`}
+                      onClick={(event) => onDocumentRowClick(doc.id, event)}
+                      onDoubleClick={() => onDocumentOpen(doc.id)}
+                      draggable
+                      onDragStart={(event) => onDocumentDragStart(event, doc)}
+                      onDragEnd={onDocumentDragEnd}
+                      onDragOver={handleDocumentTagDragOver}
+                      onDragLeave={handleDocumentTagDragLeave}
+                      onDrop={(event) => handleDocumentTagDrop(event, doc.id)}
+                    >
+                      <td className="thumb-cell">
+                        <DocumentThumbnailImage
+                          document={doc}
+                          ensureAssetUrl={ensureAssetUrl}
+                          getDocumentAsset={getDocumentAsset}
+                          alt={`Thumbnail for ${doc.title || doc.original_name}`}
+                        />
+                      </td>
+                      <td className="doc-list__name">
+                        <div className="doc-name">
+                          <div className="doc-list__name-content">
+                            <span className="doc-name__title">{doc.title || doc.original_name}</span>
+                            <button
+                              type="button"
+                              className="icon-button ghost doc-list__icon-button"
+                              onClick={(event) => {
+                                event.stopPropagation();
+                                if (!onDocumentRename) return;
+                                const nextName = window.prompt(
+                                  'Rename document',
+                                  doc.title || doc.original_name || '',
+                                );
+                                if (!nextName) {
+                                  return;
+                                }
+                                const trimmed = nextName.trim();
+                                if (!trimmed || trimmed === (doc.title || doc.original_name)) {
+                                  return;
+                                }
+                                onDocumentRename(doc.id, trimmed);
+                              }}
+                              title="Rename document"
+                              aria-label={`Rename document ${doc.title || doc.original_name}`}
+                            >
+                              <EditIcon className="doc-list__icon" size={16} />
+                            </button>
+                          </div>
+                          {(doc.tags || []).length > 0 && (
+                            <div className="doc-name__tags">
+                              {(doc.tags || []).map((tag) => {
+                                const colorSource = tag?.color || tagLookupById?.get(tag.id)?.color;
+                                const style = getTagColorStyle(colorSource);
+                                return (
+                                  <span
+                                    key={tag.id}
+                                    className="badge tag-chip"
+                                    style={style || undefined}
+                                    title={tag.label}
+                                    onClick={(event) => {
+                                      event.stopPropagation();
+                                      if (onTagClick) {
+                                        onTagClick(tag.id);
+                                      }
+                                    }}
+                                    role="button"
+                                    tabIndex={0}
+                                    draggable
+                                    onDragStart={(event) => {
+                                      event.stopPropagation();
+                                      try {
+                                        if (event.dataTransfer) {
+                                          event.dataTransfer.effectAllowed = 'copyMove';
+                                        }
+                                        const payload = JSON.stringify({
+                                          id: tag.id,
+                                          label: tag.label,
+                                          sourceDocId: doc.id,
+                                        });
+                                        event.dataTransfer?.setData('application/x-papercrate-tag', payload);
+                                        event.dataTransfer?.setData('text/papercrate-tag', payload);
+                                        event.dataTransfer?.setData('text/plain', tag.label || 'Tag');
+                                      } catch (
+                                        // eslint-disable-next-line no-empty
+                                        error
+                                      ) {}
+                                    }}
+                                    onDragEnd={(event) => {
+                                      event.stopPropagation();
+                                    }}
+                                    onKeyDown={(event) => {
+                                      if (event.key === 'Enter' || event.key === ' ') {
+                                        event.preventDefault();
+                                        event.stopPropagation();
+                                        if (onTagClick) {
+                                          onTagClick(tag.id);
+                                        }
+                                      }
+                                    }}
+                                  >
+                                    {tag.label}
+                                  </span>
+                                );
+                              })}
+                            </div>
+                          )}
+                        </div>
+                      </td>
+                      <td>{doc.content_type || 'Document'}</td>
+                      <td>
+                        {doc.updated_at
+                          ? new Date(doc.updated_at).toLocaleString()
+                          : '—'}
+                      </td>
+                      <td className="actions">
+                        <div className="action-buttons">
+                          {downloadHref ? (
+                            <a
+                              className="button-link with-icon"
+                              href={downloadHref}
+                              target="_blank"
+                              rel="noopener noreferrer"
+                              onClick={(event) => event.stopPropagation()}
+                              onAuxClick={(event) => event.stopPropagation()}
+                              onContextMenu={(event) => event.stopPropagation()}
+                            >
+                              <DownloadIcon className="icon-inline" />
+                              <span>Download</span>
+                            </a>
+                          ) : (
+                            <span className="meta">No download</span>
+                          )}
+                          <button
+                            type="button"
+                            className="danger"
+                            onClick={(event) => {
+                              event.stopPropagation();
+                              onDocumentDelete?.(doc.id);
+                            }}
+                          >
+                            Delete
+                          </button>
+                        </div>
+                      </td>
+                    </tr>
+                  );
+                })}
+              </tbody>
+            </table>
+          )}
+        </div>
+        {rows.length === 0 && showingSearchResults && !isGridView && !isSearchLoading && (
+          <div className="empty-state">No documents match the current filters.</div>
+        )}
+        {showingSearchResults && rows.length > 0 && (
+          <div className="search-hint">
+            Showing {rows.length} document{rows.length === 1 ? '' : 's'} in {currentFolderName} and subfolders.
+          </div>
+        )}
+      </div>
+      {isGridView && showingSearchResults && rows.length === 0 && !isSearchLoading && (
+        <div className="empty-state empty-state--global">
+          No documents match the current filters.
+        </div>
+      )}
+    </section>
+  );
+}; 
+
+export default DocumentsTable;
+export { DocumentThumbnailImage };

frontend/src/hooks/useApiError.js

@@ -0,0 +1,33 @@
+import { useCallback } from 'react';
+
+const noop = () => {};
+
+const normalizeMessage = (error) => {
+  if (!error) return 'Something went wrong.';
+  if (typeof error === 'string') {
+    return error;
+  }
+  const { response, message } = error;
+  if (response?.data?.error) return response.data.error;
+  if (response?.data?.message) return response.data.message;
+  return message || 'Something went wrong.';
+};
+
+const useApiError = ({
+  logger = console,
+  onReport = noop,
+} = {}) => {
+  return useCallback(
+    (error, { message, variant = 'error', retry = null } = {}) => {
+      const normalizedMessage = message || normalizeMessage(error);
+      if (logger && typeof logger.error === 'function') {
+        logger.error('[API]', normalizedMessage, error);
+      }
+      onReport({ message: normalizedMessage, variant, retry, error });
+      return normalizedMessage;
+    },
+    [logger, onReport],
+  );
+};
+
+export default useApiError;

frontend/src/sidebar/Sidebar.jsx

@@ -0,0 +1,303 @@
+import React, { useCallback, useMemo } from 'react';
+import { ChevronIcon, TrashIcon, EditIcon } from '../ui/icons';
+
+const FOLDER_ICON_SRC = '/folder.svg';
+import { getTagColorStyle } from '../utils/colors';
+
+const FolderNode = ({
+  node,
+  depth,
+  isSelected,
+  onToggle,
+  onSelect,
+  onDrop,
+  onDragOver,
+  onDragLeave,
+  onDelete,
+  onRename,
+  renderChildren,
+  onFolderDragStart,
+  onFolderDragEnd,
+  draggingFolderId,
+}) => {
+  const isRoot = node.id === 'root';
+  const hasChildren = node.children.length > 0;
+  const canToggle = !isRoot && (hasChildren || !node.loaded);
+  const showChevron = !isRoot && hasChildren;
+  const icon = showChevron ? <ChevronIcon className="toggle-icon" /> : null;
+  const canDrag = !isRoot;
+  const isDragging = draggingFolderId === node.id;
+  const isExpanded = isRoot ? true : Boolean(node.expanded);
+  const rowClasses = ['folder-row'];
+  if (isSelected) {
+    rowClasses.push('active');
+  }
+
+  const handleToggleClick = (event) => {
+    event.stopPropagation();
+    if (canToggle) {
+      onToggle(node.id);
+    }
+  };
+
+  return (
+    <li className={`folder-node${isDragging ? ' is-dragging' : ''}`}>
+      <div
+        className={rowClasses.join(' ')}
+        draggable={canDrag}
+        onClick={() => onSelect(node.id)}
+        onDragOver={(event) => onDragOver(event, node.id)}
+        onDragLeave={onDragLeave}
+        onDrop={(event) => onDrop(event, node.id)}
+        onDragStart={(event) => {
+          if (!canDrag || !onFolderDragStart) return;
+          onFolderDragStart(event, node.id);
+        }}
+        onDragEnd={(event) => {
+          if (onFolderDragEnd) {
+            onFolderDragEnd(event);
+          }
+        }}
+      >
+        {!isRoot && (
+          <span
+            className={`toggle${showChevron ? '' : ' invisible'}${isExpanded ? ' expanded' : ''}`}
+            onClick={handleToggleClick}
+          >
+            {icon}
+          </span>
+        )}
+        <span className="name">
+          <img src={FOLDER_ICON_SRC} alt="Folder" className="folder-icon-image" />
+          {node.name}
+        </span>
+        {node.id !== 'root' && (
+          <div className="folder-row__actions">
+            <button
+              type="button"
+              className="icon-button ghost"
+              onClick={(event) => {
+                event.stopPropagation();
+                if (!onRename) return;
+                const nextName = window.prompt('Rename folder', node.name || '');
+                if (!nextName) {
+                  return;
+                }
+                const trimmed = nextName.trim();
+                if (!trimmed || trimmed === node.name) {
+                  return;
+                }
+                onRename(node.id, trimmed);
+              }}
+              title="Rename folder"
+              aria-label={`Rename folder ${node.name}`}
+            >
+              <EditIcon className="icon-edit" size={18} />
+            </button>
+            <button
+              type="button"
+              className="icon-button ghost"
+              onClick={(event) => {
+                event.stopPropagation();
+                onDelete(node.id);
+              }}
+              title="Delete folder"
+              aria-label={`Delete folder ${node.name}`}
+            >
+              <TrashIcon className="icon-trash" size={18} />
+            </button>
+          </div>
+        )}
+      </div>
+      {isExpanded && node.children.length > 0 && (
+        <ul className={`folder-children${depth === 0 ? ' folder-children--level1' : ''}`}>
+          {renderChildren(node.children, depth + 1)}
+        </ul>
+      )}
+    </li>
+  );
+};
+
+const Sidebar = ({
+  folderNodes,
+  onToggle,
+  onSelect,
+  onDrop,
+  onDragOver,
+  onDragLeave,
+  onDeleteFolder,
+  onRenameFolder,
+  selectedFolder,
+  onFolderDragStart,
+  onFolderDragEnd,
+  draggedFolderId,
+  tags = [],
+  activeTagIds = [],
+  onToggleTagFilter,
+  correspondents = [],
+  activeCorrespondentIds = [],
+  onToggleCorrespondentFilter,
+}) => {
+  const sortedCorrespondents = useMemo(
+    () =>
+      [...correspondents].sort((a, b) =>
+        (a?.name || '').localeCompare(b?.name || '', undefined, { sensitivity: 'base' }),
+      ),
+    [correspondents],
+  );
+  const activeCorrespondentSet = useMemo(
+    () => new Set(activeCorrespondentIds || []),
+    [activeCorrespondentIds],
+  );
+  const handleToggleTag = onToggleTagFilter || (() => {});
+  const activeTagSet = new Set(activeTagIds);
+
+  const renderNodes = useCallback(
+    (ids, depth) =>
+      ids.map((id) => {
+        const node = folderNodes.get(id);
+        if (!node) return null;
+        return (
+          <FolderNode
+            key={id}
+            node={node}
+            depth={depth}
+            isSelected={selectedFolder === id}
+            onToggle={() => onToggle(id)}
+            onSelect={onSelect}
+            onDrop={onDrop}
+            onDragOver={onDragOver}
+            onDragLeave={onDragLeave}
+            onDelete={onDeleteFolder}
+            onRename={onRenameFolder}
+            renderChildren={renderNodes}
+            onFolderDragStart={onFolderDragStart}
+            onFolderDragEnd={onFolderDragEnd}
+            draggingFolderId={draggedFolderId}
+          />
+        );
+      }),
+    [
+      folderNodes,
+      selectedFolder,
+      onToggle,
+      onSelect,
+      onDrop,
+      onDragOver,
+      onDragLeave,
+      onDeleteFolder,
+      onRenameFolder,
+      onFolderDragStart,
+      onFolderDragEnd,
+      draggedFolderId,
+    ],
+  );
+
+  const rootNode = folderNodes.get('root');
+
+  return (
+    <aside className="sidebar column">
+      <div className="sidebar-section sidebar-section--folders">
+        <div className="sidebar-section__header">
+          <h3>Folders</h3>
+        </div>
+        <ul className="folder-tree">
+          {rootNode && renderNodes([rootNode.id], 0)}
+        </ul>
+      </div>
+      <div className="sidebar-section">
+        <div className="sidebar-section__header">
+          <h3>Tags</h3>
+          <span className="meta">{tags.length}</span>
+        </div>
+        <div
+          className={`sidebar-tag-cloud${
+            activeTagSet.size ? ' sidebar-tag-cloud--has-active' : ''
+          }`}
+          role="list"
+        >
+          {tags.length ? (
+            tags.map((tag) => {
+              const isActive = activeTagSet.has(tag.id);
+              const style = getTagColorStyle(tag.color);
+              const className = `sidebar-tag-pill${isActive ? ' active' : ''}`;
+              return (
+                <button
+                  key={tag.id}
+                  type="button"
+                  role="listitem"
+                  className={className}
+                  style={style || undefined}
+                  onClick={() => handleToggleTag(tag.id)}
+                  aria-pressed={isActive}
+                  draggable
+                  onDragStart={(event) => {
+                    try {
+                      const payload = JSON.stringify({
+                        id: tag.id,
+                        label: tag.label,
+                        color: tag.color || null,
+                      });
+                      event.dataTransfer.effectAllowed = 'copy';
+                      event.dataTransfer.setData('application/x-papercrate-tag', payload);
+                      event.dataTransfer.setData('text/papercrate-tag', payload);
+                    } catch (
+                      // eslint-disable-next-line no-empty
+                      error
+                    ) {}
+                  }}
+                >
+                  {tag.label}
+                </button>
+              );
+            })
+          ) : (
+            <span className="meta">No tags yet</span>
+          )}
+        </div>
+      </div>
+      <div className="sidebar-section">
+        <div className="sidebar-section__header">
+          <h3>Correspondents</h3>
+          <span className="meta">{correspondents.length}</span>
+        </div>
+        <ul className="sidebar-correspondent-list">
+          {sortedCorrespondents.length ? (
+            sortedCorrespondents.map((correspondent) => {
+              const isActive = activeCorrespondentSet.has(correspondent.id);
+              const className = `sidebar-correspondent-item${isActive ? ' active' : ''}`;
+              const label = correspondent.name || 'Unnamed';
+              const handleSelect = () => {
+                const nextId = isActive ? null : correspondent.id;
+                onToggleCorrespondentFilter?.(nextId);
+              };
+              return (
+                <li key={correspondent.id}>
+                  <span
+                    className={className}
+                    role="button"
+                    tabIndex={0}
+                    onClick={handleSelect}
+                    onKeyDown={(event) => {
+                      if (event.key === 'Enter' || event.key === ' ') {
+                        event.preventDefault();
+                        handleSelect();
+                      }
+                    }}
+                  >
+                    {label}
+                  </span>
+                </li>
+              );
+            })
+          ) : (
+            <li className="meta">No correspondents yet</li>
+          )}
+        </ul>
+      </div>
+    </aside>
+  );
+};
+
+export default Sidebar;
+export { FolderNode };

frontend/src/skeuomorphic_ws.css

@@ -0,0 +1,317 @@
+/* Skeuomorphic workspace styles */
+.skeuo-main {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+}
+
+.skeuo-shell {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+  position: relative;
+  background-color: var(--surface-subtle);
+}
+
+.skeuo-header {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 1rem;
+  padding: 0.75rem 1rem 0.5rem;
+  background-color: var(--surface-subtle);
+}
+
+.skeuo-header__meta {
+  display: flex;
+  flex-direction: column;
+  gap: 0.35rem;
+}
+
+.skeuo-header__meta h2 {
+  margin: 0;
+  font-size: 1.25rem;
+  font-weight: 600;
+}
+
+.skeuo-breadcrumbs {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.35rem;
+  font-size: 0.85rem;
+  color: var(--muted);
+}
+
+.skeuo-crumb {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.35rem;
+}
+
+.skeuo-crumb.is-current {
+  color: var(--fg);
+  font-weight: 600;
+}
+
+.skeuo-crumb-separator {
+  opacity: 0.4;
+}
+
+.skeuo-header__actions {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.skeuo-canvas {
+  flex: 1;
+  position: relative;
+  overflow: hidden;
+  margin: 0;
+}
+
+.skeuo-empty {
+  height: 100%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 3rem;
+  text-align: center;
+  color: var(--muted);
+  font-size: 0.95rem;
+}
+
+.skeuo-item {
+  position: absolute;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  width: auto;
+  cursor: grab;
+  touch-action: none;
+  transform-origin: center center;
+  transition: transform 0.28s ease, box-shadow 0.16s ease;
+  outline: none;
+  will-change: transform;
+}
+
+.skeuo-item__body {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  transition: width 0.28s ease, height 0.28s ease;
+}
+
+.skeuo-item:focus-visible {
+  outline: 2px solid var(--accent);
+  outline-offset: 4px;
+}
+
+.skeuo-item.is-dragging {
+  cursor: grabbing;
+  transition: none;
+}
+
+.skeuo-item.is-zoomed {
+  cursor: pointer;
+}
+
+.skeuo-item.is-tag-target .skeuo-item__card {
+  outline: 1em dashed var(--accent);
+  outline-offset: 1.41em;
+}
+
+.skeuo-item.is-tag-pending .skeuo-item__card {
+  opacity: 0.6;
+}
+
+.skeuo-item.is-filtered-out {
+  opacity: 0.12;
+  pointer-events: none;
+  filter: blur(15px) grayscale(100%);
+  transition: opacity 0.6s ease, filter 0.28s ease;
+  z-index: 0 !important;
+}
+
+.skeuo-item__tags {
+  --tag-scale: 1;
+  position: absolute;
+  top: 0;
+  right: 0;
+  display: flex;
+  flex-direction: column;
+  gap: 0.35rem;
+  align-items: flex-end;
+  transform-origin: top right;
+  transform: scale(var(--tag-scale)) translate(-0.5em, 0.5em);
+  transition: transform 0.28s ease;
+}
+
+.skeuo-tag {
+  display: inline-flex;
+  align-items: center;
+  justify-content: flex-start;
+  padding: 0.28rem 0.7rem;
+  border-radius: 1px;
+  background: linear-gradient(180deg, rgba(0, 0, 0, 0.04), rgba(0, 0, 0, 0) 70%), var(--surface);
+  color: var(--fg);
+  font-size: 1rem;
+  font-weight: 600;
+  box-shadow: 2px 2px 3px rgba(0, 0, 0, 0.18);
+  text-align: left;
+  white-space: nowrap;
+  user-select: none;
+}
+
+.skeuo-item__tags .skeuo-tag {
+  font-size: 0.75rem;
+  padding: 0.18rem 0.55rem;
+  pointer-events: auto;
+  cursor: grab;
+  transition: transform 0.16s ease, opacity 0.2s ease;
+}
+
+.skeuo-tag.is-drag-hidden {
+  opacity: 0.4;
+  pointer-events: none;
+}
+
+.skeuo-tag span {
+  display: block;
+  pointer-events: none;
+  user-select: none;
+}
+
+.skeuo-item__tags .skeuo-tag.is-tear-pending {
+  opacity: 0.4;
+}
+
+.skeuo-tag-shelf {
+  position: absolute;
+  top: 2.25rem;
+  right: 1rem;
+  display: flex;
+  flex-direction: column;
+  gap: 0.6rem;
+  align-items: flex-end;
+  max-height: calc(100% - 4rem);
+  overflow: auto;
+  padding: 0;
+  z-index: 100000;
+}
+
+.skeuo-tag-shelf .skeuo-tag {
+  cursor: grab;
+}
+
+.skeuo-tag-shelf .skeuo-tag:active {
+  cursor: grabbing;
+}
+
+.skeuo-tag-shelf .skeuo-tag.is-inactive {
+  opacity: 0.25;
+}
+
+.skeuo-tag-shelf .skeuo-tag.is-active {
+  opacity: 1;
+  box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.08);
+}
+
+.skeuo-tag-add {
+  width: 2.4rem;
+  height: 2.4rem;
+  border-radius: 50%;
+  border: 1px solid rgba(0, 0, 0, 0.15);
+  background: rgba(255, 255, 255, 0.8);
+  color: var(--fg);
+  font-size: 1.4rem;
+  line-height: 1;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+  margin-top: 0.4rem;
+  transition: background 0.2s ease, transform 0.2s ease;
+}
+
+.skeuo-tag-add:hover {
+  background: rgba(255, 255, 255, 1);
+  transform: translateY(-1px);
+}
+
+.skeuo-tag-add:active {
+  transform: translateY(0);
+}
+
+.skeuo-tag-add:focus-visible {
+  outline: 2px solid var(--accent);
+  outline-offset: 2px;
+}
+
+body.skeuo-cursor-remove,
+body.skeuo-cursor-remove * {
+  cursor: not-allowed !important;
+}
+
+.skeuo-item__shadow {
+  display: none;
+}
+
+.skeuo-item__card {
+  position: relative;
+  border-radius: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: 0 24px 72px rgba(0, 0, 0, 0.24);
+  overflow: hidden;
+}
+
+.skeuo-item__card--empty {
+  background:
+    radial-gradient(circle at 28% 24%, rgba(255, 255, 255, 0.32), transparent 60%),
+    radial-gradient(circle at 72% 78%, rgba(0, 0, 0, 0.08), transparent 65%),
+    linear-gradient(135deg, #e6e1d6 0%, #d2cdc2 100%);
+  width: 100%;
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 0.5rem;
+}
+
+.skeuo-item__placeholder {
+  font-size: 0.95rem;
+  font-weight: 500;
+  letter-spacing: normal;
+  color: var(--muted);
+}
+
+.skeuo-item__empty {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  width: 100%;
+  height: 100%;
+  gap: 0.5rem;
+  padding: 1rem;
+  text-align: center;
+}
+
+.skeuo-item__title {
+  font-size: 0.95rem;
+  font-weight: 500;
+  color: #3b3b3b;
+  max-width: 90%;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}

frontend/src/tag_manager.js

@@ -0,0 +1,27 @@
+import { generateRandomTagColor } from './utils/colors';
+
+class TagManager {
+  constructor({ colorGenerator = generateRandomTagColor } = {}) {
+    this.colorGenerator = typeof colorGenerator === 'function' ? colorGenerator : generateRandomTagColor;
+  }
+
+  normalizeLabel(label) {
+    if (typeof label !== 'string') {
+      return '';
+    }
+    return label.trim();
+  }
+
+  buildPayload({ label, color } = {}) {
+    const normalizedLabel = this.normalizeLabel(label);
+    if (!normalizedLabel) {
+      throw new Error('Tag label is required.');
+    }
+    const payload = { label: normalizedLabel };
+    const trimmedColor = typeof color === 'string' && color.trim().length ? color.trim() : null;
+    payload.color = trimmedColor || this.colorGenerator();
+    return payload;
+  }
+}
+
+export default TagManager;

frontend/src/tags/TagsPanel.jsx

@@ -0,0 +1,255 @@
+import React, { useCallback, useMemo, useState } from 'react';
+import { getTagColorStyle, HEX_COLOR_PATTERN } from '../utils/colors';
+
+function TagsPanel({ tags, onRefresh, onUpdateTag, onDeleteTag, onNotify }) {
+  const [editingId, setEditingId] = useState(null);
+  const [draftLabel, setDraftLabel] = useState('');
+  const [draftColor, setDraftColor] = useState('');
+  const [saving, setSaving] = useState(false);
+  const [deletingId, setDeletingId] = useState(null);
+
+  const startEdit = useCallback((tag) => {
+    setEditingId(tag.id);
+    setDraftLabel(tag.label || '');
+    setDraftColor(tag.color || '');
+  }, []);
+
+  const cancelEdit = useCallback(() => {
+    setEditingId(null);
+    setDraftLabel('');
+    setDraftColor('');
+    setSaving(false);
+  }, []);
+
+  const colorPickerValue = useMemo(() => {
+    if (!draftColor) {
+      return '#3366ff';
+    }
+    const match = HEX_COLOR_PATTERN.exec(draftColor.trim());
+    if (!match) {
+      return '#3366ff';
+    }
+    return `#${match[1].toLowerCase()}`;
+  }, [draftColor]);
+
+  const handleSave = useCallback(async () => {
+    if (!editingId) return;
+
+    const trimmedLabel = draftLabel.trim();
+    if (!trimmedLabel) {
+      onNotify?.('Tag label cannot be empty.', 'error');
+      return;
+    }
+
+    const trimmedColor = draftColor.trim();
+    const colorPattern = /^#([0-9a-fA-F]{6})$/;
+    if (trimmedColor && !colorPattern.test(trimmedColor)) {
+      onNotify?.('Colors must use the #RRGGBB format.', 'error');
+      return;
+    }
+
+    setSaving(true);
+    try {
+      await onUpdateTag(editingId, {
+        label: trimmedLabel,
+        color: trimmedColor ? trimmedColor : null,
+      });
+      cancelEdit();
+    } catch (updateError) {
+      const message = updateError?.message || 'Failed to update tag.';
+      onNotify?.(message, 'error');
+    } finally {
+      setSaving(false);
+    }
+  }, [editingId, draftLabel, draftColor, onUpdateTag, cancelEdit, onNotify]);
+
+  const handleKeyDown = useCallback(
+    (event) => {
+      if (event.key === 'Enter') {
+        event.preventDefault();
+        handleSave();
+      } else if (event.key === 'Escape') {
+        event.preventDefault();
+        cancelEdit();
+      }
+    },
+    [handleSave, cancelEdit],
+  );
+
+  const handleDelete = useCallback(
+    async (tag) => {
+      if (!tag?.id || typeof onDeleteTag !== 'function') {
+        return;
+      }
+
+      setDeletingId(tag.id);
+      try {
+        await onDeleteTag(tag.id);
+        if (editingId === tag.id) {
+          cancelEdit();
+        }
+      } catch (deleteError) {
+        const message = deleteError?.message || 'Failed to delete tag.';
+        onNotify?.(message, 'error');
+      } finally {
+        setDeletingId(null);
+      }
+    },
+    [onDeleteTag, editingId, cancelEdit, onNotify],
+  );
+
+  return (
+    <section className="tags-panel column">
+      <div className="column-header">
+        <div className="column-header__titles">
+          <h2>Tags</h2>
+          <div className="column-subtitle">{tags.length} total</div>
+        </div>
+        <div className="header-actions">
+          <button
+            className="secondary"
+            type="button"
+            onClick={onRefresh}
+            disabled={saving || Boolean(deletingId)}
+          >
+            Refresh
+          </button>
+        </div>
+      </div>
+      <div className="column-body tags-panel__body">
+        {tags.length === 0 ? (
+          <div className="empty-state">No tags created yet.</div>
+        ) : (
+          <div className="tags-table">
+            <table>
+              <thead>
+                <tr>
+                  <th scope="col">Tag</th>
+                  <th scope="col">Color</th>
+                  <th scope="col" className="numeric">
+                    Documents
+                  </th>
+                  <th scope="col" className="actions">
+                    Actions
+                  </th>
+                </tr>
+              </thead>
+              <tbody>
+                {tags.map((tag) => {
+                  const isEditing = editingId === tag.id;
+                  return (
+                    <tr key={tag.id} className={isEditing ? 'editing' : ''}>
+                      <td className="tags-table__label">
+                        {isEditing ? (
+                          <input
+                            className="tags-table__label-input"
+                            value={draftLabel}
+                            onChange={(event) => setDraftLabel(event.target.value)}
+                            onKeyDown={handleKeyDown}
+                            disabled={saving || deletingId === tag.id}
+                            autoFocus
+                          />
+                        ) : (
+                          <span
+                            className="badge tag-chip"
+                            style={getTagColorStyle(tag.color) || undefined}
+                          >
+                            {tag.label}
+                          </span>
+                        )}
+                      </td>
+                      <td>
+                        {isEditing ? (
+                          <div className="tags-table__color-editor">
+                            <input
+                              type="color"
+                              className="tags-table__color-picker"
+                              value={colorPickerValue}
+                              onChange={(event) => setDraftColor(event.target.value)}
+                              disabled={saving || deletingId === tag.id}
+                              aria-label="Pick tag color"
+                            />
+                            {draftColor && (
+                              <button
+                                type="button"
+                                className="secondary"
+                                onClick={() => setDraftColor('')}
+                                disabled={saving || deletingId === tag.id}
+                              >
+                                Clear
+                              </button>
+                            )}
+                          </div>
+                        ) : tag.color ? (
+                          <span
+                            className="tags-table__swatch"
+                            style={{ backgroundColor: tag.color }}
+                            aria-label={`Tag color ${tag.color}`}
+                          />
+                        ) : (
+                          <span className="meta">—</span>
+                        )}
+                      </td>
+                      <td className="numeric">{tag.usage_count ?? 0}</td>
+                      <td className="actions">
+                        {isEditing ? (
+                          <div className="tags-table__edit-controls">
+                            <button
+                              type="button"
+                              className="secondary"
+                              onClick={handleSave}
+                              disabled={saving || deletingId === tag.id}
+                            >
+                              Save
+                            </button>
+                            <button
+                              type="button"
+                              className="secondary"
+                              onClick={cancelEdit}
+                              disabled={saving || deletingId === tag.id}
+                            >
+                              Cancel
+                            </button>
+                            <button
+                              type="button"
+                              className="danger"
+                              onClick={() => handleDelete(tag)}
+                              disabled={deletingId === tag.id}
+                            >
+                              Delete
+                            </button>
+                          </div>
+                        ) : (
+                          <div className="tags-table__row-actions">
+                            <button
+                              type="button"
+                              className="secondary"
+                              onClick={() => startEdit(tag)}
+                              disabled={deletingId === tag.id}
+                            >
+                              Edit
+                            </button>
+                            <button
+                              type="button"
+                              className="danger"
+                              onClick={() => handleDelete(tag)}
+                              disabled={deletingId === tag.id}
+                            >
+                              Delete
+                            </button>
+                          </div>
+                        )}
+                      </td>
+                    </tr>
+                  );
+                })}
+              </tbody>
+            </table>
+          </div>
+        )}
+      </div>
+    </section>
+  );
+}
+
+export default TagsPanel;

frontend/src/ui/icons.js

@@ -0,0 +1,106 @@
+import {
+  IconChevronRight as TablerChevronRight,
+  IconDownload as TablerDownload,
+  IconFolderFilled,
+  IconPencil,
+  IconTagFilled,
+  IconUserFilled,
+  IconTrash,
+  IconLayoutList,
+  IconLayoutGrid,
+} from '@tabler/icons-react';
+
+const composeClassName = (base, extra) => (extra ? `${base} ${extra}` : base);
+
+export const ChevronIcon = ({ className, size = '1em', stroke = 1.6, ...rest }) => (
+  <TablerChevronRight
+    className={composeClassName('icon', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
+export const TrashIcon = ({ className, size = '1em', stroke = 1.6, ...rest }) => (
+  <IconTrash
+    className={composeClassName('icon', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
+export const EditIcon = ({ className, size = '1em', stroke = 1.6, ...rest }) => (
+  <IconPencil
+    className={composeClassName('icon', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
+export const FolderIcon = ({ className, size = '1em', stroke = 0, ...rest }) => (
+  <IconFolderFilled
+    className={composeClassName('icon icon--fill', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
+export const TagIcon = ({ className, size = '1em', stroke = 0, ...rest }) => (
+  <IconTagFilled
+    className={composeClassName('icon icon--fill', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
+export const CorrespondentIcon = ({ className, size = '1em', stroke = 0, ...rest }) => (
+  <IconUserFilled
+    className={composeClassName('icon icon--fill', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
+export const DownloadIcon = ({ className, size = '1em', stroke = 1.6, ...rest }) => (
+  <TablerDownload
+    className={composeClassName('icon', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
+export const ViewListIcon = ({ className, size = '1em', stroke = 1.6, ...rest }) => (
+  <IconLayoutList
+    className={composeClassName('icon', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
+export const ViewGridIcon = ({ className, size = '1em', stroke = 1.6, ...rest }) => (
+  <IconLayoutGrid
+    className={composeClassName('icon', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
+export default {
+  ChevronIcon,
+  TrashIcon,
+  EditIcon,
+  FolderIcon,
+  TagIcon,
+  CorrespondentIcon,
+  DownloadIcon,
+  ViewListIcon,
+  ViewGridIcon,
+};

frontend/src/utils/colors.js

@@ -0,0 +1,134 @@
+const HEX_COLOR_PATTERN = /^#?([0-9a-fA-F]{6})$/;
+
+const clamp01 = (value) => Math.min(1, Math.max(0, value));
+
+const gammaEncode = (channel) =>
+  channel <= 0.0031308 ? 12.92 * channel : 1.055 * Math.pow(channel, 1 / 2.4) - 0.055;
+
+const oklchToHex = (l, c, h) => {
+  const hr = (h * Math.PI) / 180;
+  const a = Math.cos(hr) * c;
+  const b = Math.sin(hr) * c;
+
+  const l1 = l + 0.3963377774 * a + 0.2158037573 * b;
+  const m1 = l - 0.1055613458 * a - 0.0638541728 * b;
+  const s1 = l - 0.0894841775 * a - 1.291485548 * b;
+
+  const l3 = l1 ** 3;
+  const m3 = m1 ** 3;
+  const s3 = s1 ** 3;
+
+  const r = 4.0767416621 * l3 - 3.3077115913 * m3 + 0.2309699292 * s3;
+  const g = -1.2684380046 * l3 + 2.6097574011 * m3 - 0.3413193965 * s3;
+  const bLin = -0.0041960863 * l3 - 0.7034186147 * m3 + 1.707614701 * s3;
+
+  if ([r, g, bLin].some((channel) => channel < 0 || channel > 1)) {
+    return null;
+  }
+
+  const sr = Math.round(clamp01(gammaEncode(r)) * 255);
+  const sg = Math.round(clamp01(gammaEncode(g)) * 255);
+  const sb = Math.round(clamp01(gammaEncode(bLin)) * 255);
+
+  return `#${((sr << 16) | (sg << 8) | sb).toString(16).padStart(6, '0')}`;
+};
+
+const hslToHex = (h, s, l) => {
+  const normalizedH = ((h % 360) + 360) % 360;
+  const sat = clamp01(s);
+  const light = clamp01(l);
+
+  const chroma = (1 - Math.abs(2 * light - 1)) * sat;
+  const hPrime = normalizedH / 60;
+  const x = chroma * (1 - Math.abs((hPrime % 2) - 1));
+
+  let r1 = 0;
+  let g1 = 0;
+  let b1 = 0;
+
+  if (hPrime >= 0 && hPrime < 1) {
+    r1 = chroma;
+    g1 = x;
+  } else if (hPrime >= 1 && hPrime < 2) {
+    r1 = x;
+    g1 = chroma;
+  } else if (hPrime >= 2 && hPrime < 3) {
+    g1 = chroma;
+    b1 = x;
+  } else if (hPrime >= 3 && hPrime < 4) {
+    g1 = x;
+    b1 = chroma;
+  } else if (hPrime >= 4 && hPrime < 5) {
+    r1 = x;
+    b1 = chroma;
+  } else {
+    r1 = chroma;
+    b1 = x;
+  }
+
+  const m = light - chroma / 2;
+  const r = clamp01(r1 + m);
+  const g = clamp01(g1 + m);
+  const b = clamp01(b1 + m);
+
+  const sr = Math.round(r * 255);
+  const sg = Math.round(g * 255);
+  const sb = Math.round(b * 255);
+  return `#${((sr << 16) | (sg << 8) | sb).toString(16).padStart(6, '0')}`;
+};
+
+export const hexToRgb = (input) => {
+  if (!input) return null;
+  const match = HEX_COLOR_PATTERN.exec(input.trim());
+  if (!match) return null;
+  const value = parseInt(match[1], 16);
+  return {
+    r: (value >> 16) & 0xff,
+    g: (value >> 8) & 0xff,
+    b: value & 0xff,
+    hex: `#${match[1].toLowerCase()}`,
+  };
+};
+
+export const relativeLuminance = ({ r, g, b }) => {
+  const toLinear = (channel) => {
+    const normalized = channel / 255;
+    return normalized <= 0.03928
+      ? normalized / 12.92
+      : ((normalized + 0.055) / 1.055) ** 2.4;
+  };
+
+  const [red, green, blue] = [toLinear(r), toLinear(g), toLinear(b)];
+  return 0.2126 * red + 0.7152 * green + 0.0722 * blue;
+};
+
+export const getReadableTextColor = (hex, { light = '#1f1f1f', dark = '#ffffff' } = {}) => {
+  const rgb = hexToRgb(hex);
+  if (!rgb) return dark;
+  const luminance = relativeLuminance(rgb);
+  return luminance > 0.6 ? light : dark;
+};
+
+export const getTagColorStyle = (hex) => {
+  const rgb = hexToRgb(hex);
+  if (!rgb) return null;
+  return {
+    backgroundColor: rgb.hex,
+    borderColor: rgb.hex,
+    color: getReadableTextColor(rgb.hex),
+  };
+};
+
+export const generateRandomTagColor = () => {
+  const bucketCount = 8;
+  const bucketWidth = 360 / bucketCount;
+  const bucket = Math.floor(Math.random() * bucketCount);
+  const baseHue = bucket * bucketWidth;
+  const hueJitter = bucketWidth * 0.35;
+  const hue = baseHue + (Math.random() * 2 - 1) * hueJitter;
+  const saturation = 0.45 + Math.random() * 0.2; // 0.45 - 0.65
+  const lightness = 0.55 + Math.random() * 0.1; // 0.55 - 0.65
+  return hslToHex(hue, saturation, lightness);
+};
+
+export { HEX_COLOR_PATTERN };

frontend/src/utils/format.js

@@ -0,0 +1,18 @@
+export const formatFileSize = (value) => {
+  const bytes = Number(value);
+  if (!Number.isFinite(bytes) || bytes <= 0) {
+    return '0 B';
+  }
+
+  const units = ['B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB'];
+  let index = 0;
+  let amount = bytes;
+
+  while (amount >= 1024 && index < units.length - 1) {
+    amount /= 1024;
+    index += 1;
+  }
+
+  return `${amount.toFixed(2)} ${units[index]}`;
+};
+

frontend/webpack.config.js

@@ -7,8 +7,7 @@ const env = dotenv.config({ path: path.resolve(__dirname, '.env.local') }).parse
 
 const DEFAULT_DEV_API = 'http://127.0.0.1:3000';
 
-const API_BASE_URL = env.API_BASE_URL || process.env.API_BASE_URL || '';
-const devServerApiTarget = API_BASE_URL || DEFAULT_DEV_API;
+const API_BASE_URL = env.API_BASE_URL || process.env.API_BASE_URL || DEFAULT_DEV_API;
 
 module.exports = {
   entry: './src/index.jsx',
@@ -49,13 +48,6 @@ module.exports = {
     port: 5173,
     historyApiFallback: true,
     open: true,
-    proxy: [
-      {
-        context: ['/api'],
-        target: devServerApiTarget,
-        changeOrigin: true,
-      },
-    ],
   },
   devtool: 'source-map',
   resolve: {

k8s/papercrate/templates/_helpers.tpl

@@ -46,6 +46,10 @@ app.kubernetes.io/instance: {{ .Release.Name }}
 {{- include "papercrate.image" (dict "Values" .Values "image" .Values.backend.image) -}}
 {{- end -}}
 
+{{- define "papercrate.webdav.image" -}}
+{{- include "papercrate.image" (dict "Values" .Values "image" .Values.webdav.image) -}}
+{{- end -}}
+
 {{- define "papercrate.frontend.image" -}}
 {{- include "papercrate.image" (dict "Values" .Values "image" .Values.frontend.image) -}}
 {{- end -}}

k8s/papercrate/templates/webdav-deployment.yaml

@@ -0,0 +1,91 @@
+{{- if .Values.webdav.enabled }}
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "papercrate.fullname" . }}-webdav
+  labels:
+    {{- include "papercrate.labels" . | nindent 4 }}
+    app.kubernetes.io/component: webdav
+spec:
+  replicas: {{ .Values.webdav.replicaCount }}
+  selector:
+    matchLabels:
+      {{- include "papercrate.selectorLabels" . | nindent 6 }}
+      app.kubernetes.io/component: webdav
+  template:
+    metadata:
+      labels:
+        {{- include "papercrate.selectorLabels" . | nindent 8 }}
+        app.kubernetes.io/component: webdav
+    spec:
+      {{- if or .Values.global.imagePullSecrets .Values.imagePullSecrets }}
+      imagePullSecrets:
+        {{- range .Values.global.imagePullSecrets }}
+        - name: {{ . }}
+        {{- end }}
+        {{- range .Values.imagePullSecrets }}
+        - name: {{ . }}
+        {{- end }}
+      {{- end }}
+      containers:
+        - name: webdav
+          image: {{ include "papercrate.webdav.image" . }}:{{ include "papercrate.image.tag" (dict "image" .Values.webdav.image "Chart" .Chart) }}
+          imagePullPolicy: {{ .Values.webdav.image.pullPolicy }}
+          command:
+            - /usr/local/bin/papercrate-webdav
+          ports:
+            - name: http
+              containerPort: {{ .Values.webdav.service.port }}
+              protocol: TCP
+          env:
+            - name: SERVER_HOST
+              value: 0.0.0.0
+            - name: SERVER_PORT
+              value: {{ .Values.webdav.service.port | quote }}
+            - name: WEBDAV_HOST
+              value: 0.0.0.0
+            - name: WEBDAV_PORT
+              value: {{ .Values.webdav.service.port | quote }}
+            {{- with .Values.global.s3.endpoint }}
+            - name: AWS_ENDPOINT_URL
+              value: {{ . | quote }}
+            {{- end }}
+            {{- with .Values.global.s3.region }}
+            - name: AWS_REGION
+              value: {{ . | quote }}
+            {{- end }}
+            {{- with .Values.global.s3.bucket }}
+            - name: S3_BUCKET
+              value: {{ . | quote }}
+            {{- end }}
+            {{- range .Values.webdav.env.extra }}
+            - name: {{ .name }}
+              value: {{ .value | quote }}
+            {{- end }}
+          envFrom:
+            - secretRef:
+                name: {{ if .Values.webdav.env.existingSecret }}{{ .Values.webdav.env.existingSecret }}{{ else }}{{ include "papercrate.fullname" . }}-backend-env{{ end }}
+            {{- with .Values.global.s3.credentialsSecret }}
+            - secretRef:
+                name: {{ . }}
+            {{- end }}
+            {{- range .Values.webdav.envFrom }}
+            - {{ toYaml . | nindent 12 | trim }}
+            {{- end }}
+          {{- with .Values.webdav.resources }}
+          resources:
+            {{- toYaml . | nindent 12 }}
+          {{- end }}
+      {{- with .Values.webdav.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.webdav.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.webdav.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+{{- end }}

k8s/papercrate/templates/webdav-service.yaml

@@ -0,0 +1,19 @@
+{{- if .Values.webdav.enabled }}
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "papercrate.fullname" . }}-webdav
+  labels:
+    {{- include "papercrate.labels" . | nindent 4 }}
+    app.kubernetes.io/component: webdav
+spec:
+  type: {{ .Values.webdav.service.type }}
+  ports:
+    - name: http
+      port: {{ .Values.webdav.service.port }}
+      targetPort: http
+      protocol: TCP
+  selector:
+    {{- include "papercrate.selectorLabels" . | nindent 4 }}
+    app.kubernetes.io/component: webdav
+{{- end }}

k8s/papercrate/values.yaml

@@ -28,6 +28,25 @@ backend:
   tolerations: []
   affinity: {}
 
+webdav:
+  enabled: true
+  replicaCount: 1
+  image:
+    repository: registry.example.com/papercrate-backend
+    tag: ""
+    pullPolicy: IfNotPresent
+  service:
+    type: ClusterIP
+    port: 3001
+  env:
+    existingSecret: ""
+    extra: []
+  envFrom: []
+  resources: {}
+  nodeSelector: {}
+  tolerations: []
+  affinity: {}
+
 worker:
   replicaCount: 1
   enabled: true