ReadMeABook/documentation/backend/database.md

Database Schema

Status: ✅ Implemented

PostgreSQL database storing users, audiobooks, requests, downloads, configuration, and jobs.

Setup: Automatically created on container startup via prisma db push (syncs schema directly to DB without migration files).

Tables

Users

• id (UUID PK), plex_id (unique), plex_username, plex_email, role ('user'|'admin')
• is_setup_admin (bool, default false) - First admin created during setup, role protected from changes
• avatar_url, auth_token (encrypted), created_at, updated_at, last_login_at
• Plex Home profile tracking:
  • plex_home_user_id (string, nullable) - Profile ID from Plex Home (null = main account, set = home profile)
• BookDate per-user preferences:
  • bookdate_library_scope ('full'|'rated', default 'full') - Library scope for recommendations
  • bookdate_custom_prompt (text, optional, max 1000 chars) - Custom preferences for AI
  • bookdate_onboarding_complete (bool, default false) - Whether user has completed BookDate onboarding
• Indexes: plex_id, role

Audible_Cache

• id (UUID PK), asin (unique, Audible ID), title, author, narrator, description
• cover_art_url, cached_cover_path (local thumbnail path), duration_minutes, release_date, rating, genres (JSONB)
• Discovery: is_popular (bool), is_new_release (bool), popular_rank, new_release_rank
• last_synced_at, created_at, updated_at
• Indexes: asin, title, author, is_popular, is_new_release, popular_rank, new_release_rank
• Purpose: Cached Audible metadata (popular/new releases), thumbnails stored locally in /app/cache/thumbnails

Plex_Library (Library Cache)

• id (UUID PK), plex_guid (unique, external ID from Plex or Audiobookshelf), plex_rating_key
• title, author, narrator, summary, duration (milliseconds), year, user_rating (0-10 scale)
• Universal identifiers: asin (Audible ASIN), isbn (ISBN-10 or ISBN-13)
• file_path, thumb_url, plex_library_id, added_at
• last_scanned_at, created_at, updated_at
• Indexes: plex_guid, title, author, plex_library_id, asin, isbn
• Purpose: Universal library cache for both Plex and Audiobookshelf backends
• ASIN/ISBN fields: Enable accurate matching across backends
  • Plex: ASIN extracted from Plex GUID (e.g., com.plexapp.agents.audible://B00ABC123) + stored in dedicated field
  • Audiobookshelf: ASIN/ISBN retrieved directly from ABS metadata + stored in dedicated fields
  • Matching: Prioritizes exact ASIN/ISBN matches (100% confidence) before fuzzy title/author matching

Audiobooks

• id (UUID PK), audible_asin (nullable), title, author, narrator, description
• cover_art_url, file_path, file_format, file_size_bytes
• plex_guid (nullable), plex_library_id (nullable)
• status ('requested'|'downloading'|'processing'|'completed'|'failed')
• created_at, updated_at, completed_at
• Indexes: audible_asin, plex_guid, title, author, status
• Purpose: User-requested audiobooks only (created on request)

Requests

• id (UUID PK), user_id (FK), audiobook_id (FK)
• status ('pending'|'searching'|'downloading'|'processing'|'downloaded'|'available'|'failed'|'cancelled'|'awaiting_search'|'awaiting_import'|'warn')
  • Flow: pending → searching → downloading → processing → downloaded → available (when matched in Plex)
• progress (0-100), priority, error_message
• search_attempts, download_attempts, import_attempts, max_import_retries (default 5)
• last_search_at, last_import_at, created_at, updated_at, completed_at
• Unique: (user_id, audiobook_id)
• Indexes: user_id, audiobook_id, status, created_at DESC

Download_History

• id (UUID PK), request_id (FK), indexer_name, torrent_name, torrent_hash
• torrent_size_bytes, magnet_link, torrent_url, seeders, leechers
• quality_score, selected (bool), download_client, download_client_id
• download_status ('queued'|'downloading'|'completed'|'failed'|'stalled')
• download_error, started_at, completed_at, created_at
• Indexes: request_id, selected, created_at DESC

Configuration

• id (UUID PK), key (unique), value, encrypted (bool), category, description
• created_at, updated_at
• Indexes: key, category
• Example keys: plex.server_url, plex.auth_token, indexer.prowlarr_url, download_client.qbittorrent_password, paths.downloads, setup.completed

Jobs

• id (UUID PK), bull_job_id, request_id (FK nullable)
• type ('search_indexers'|'monitor_download'|'organize_files'|'scan_plex'|'match_plex'|'plex_library_scan'|'plex_recently_added_check'|'audible_refresh'|'retry_missing_torrents'|'retry_failed_imports'|'cleanup_seeded_torrents'|'monitor_rss_feeds')
• status ('pending'|'active'|'completed'|'failed'|'delayed'|'stuck')
• priority, attempts, max_attempts (default 3)
• payload (JSONB), result (JSONB), error_message, stack_trace
• started_at, completed_at, created_at, updated_at
• Indexes: request_id, type, status, created_at DESC

Job_Events

• id (UUID PK), job_id (FK → Jobs, CASCADE delete)
• level ('info'|'warn'|'error')
• context (processor name: OrganizeFiles, FileOrganizer, MonitorDownload, etc.)
• message (event description)
• metadata (JSONB, optional structured data)
• created_at (timestamp)
• Indexes: job_id, created_at
• Purpose: Store detailed event logs for job operations (shown in admin logs UI)

Relationships

• User → Requests (1:many)
• Audiobook → Requests (1:many)
• Request → Download History (1:many)
• Request → Jobs (1:many, nullable)
• Job → Job Events (1:many, CASCADE delete)

Setup Strategy

Approach: Schema sync via prisma db push

• Prisma schema is source of truth
• On startup: sync schema → database
• Idempotent (safe to run multiple times)
• No migration files needed
• Generates Prisma client after sync

ORM: Prisma 6.x

• Type-safe queries
• Auto-generated types
• Connection pooling
• Client output: src/generated/prisma

Security

Encryption at Rest (AES-256):

• User auth tokens
• API keys/passwords in Configuration
• Download client credentials

SQL Injection: Parameterized queries only via ORM

Access Control: Row-level (users see only their requests), admins have full access

Tech Stack

• PostgreSQL 16+
• Prisma 6.x
• prisma db push (schema sync)
• Node.js crypto (encryption)