58 lines
2.2 KiB
Markdown
58 lines
2.2 KiB
Markdown
---
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title: Database
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---
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This page covers database mode selection for OpenReader.
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## Scope of this page
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- Focus: SQL metadata, state, and relational tables.
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- Not covered here: object key layout and blob transport details (see [Object / Blob Storage](./object-blob-storage)).
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## Database mode
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- SQLite (default): embedded DB at `docstore/sqlite3.db`; good for local/self-host single-instance setups.
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- Postgres: enabled when `POSTGRES_URL` is set; recommended for production/distributed deployments.
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## What the database stores
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- Document and audiobook metadata/state used by server routes.
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- Auth/session tables (`user`, `session`, `account`, `verification`) when auth is enabled — schema is auto-generated by Better Auth.
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- TTS character usage counters (`user_tts_chars`) for daily rate limiting (when enabled).
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- User settings preferences (`user_preferences`) when auth is enabled.
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- User reading progress (`user_document_progress`) when auth is enabled.
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- Document preview job/asset metadata (`document_previews`) for server-side PDF/EPUB thumbnails.
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- TTS segment metadata (`tts_segments`) for server-side playback caching:
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- Segment identity + settings hash
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- Audio object key and duration
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- Optional alignment payload for word highlighting
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- Status/error state
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- Text fingerprint/hash (plaintext segment text is not stored)
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App-specific tables are manually maintained in Drizzle schema files, while auth tables are generated by the Better Auth CLI. Both are migrated together via Drizzle. See [Migrations](./migrations) for details.
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## What the database does not store
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- Raw document file bytes
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- Audiobook audio bytes
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- TTS segment audio bytes
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- Generated preview image bytes
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Those payloads live in object storage. SQL stores the metadata, references, and status.
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## Related variables
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- `POSTGRES_URL`
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For database variable behavior, see [Environment Variables](../reference/environment-variables#database-and-object-blob-storage).
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## Related docs
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- [Migrations](./migrations)
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- [Object / Blob Storage](./object-blob-storage)
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- [Auth](./auth)
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## State sync summary
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- Settings and reading progress are stored in SQL and synced from the app.
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- Sync is currently request-based (not realtime push invalidation).
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