a lot of things

backend/migrations/202503120001_drop_asset_dimensions/down.sql

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+-- 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

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+-- 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

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+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

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+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;