PostgreSQL: Production fixes—UPSERT, remote backup, auth logs

- Fix: Atomic UPSERT for BaseItemProviders (resolves duplicate key errors during concurrent metadata refresh; clears navigation property to prevent EF Core tracking conflicts) - Add: Remote PostgreSQL backup support (removes localhost-only restriction; works with pg_dump/pg_restore for both local and remote DBs) - Add: Configurable backup disable option (`disable-backups`) - Fix: Query timeout and performance (documented `command-timeout` config, added performance index scripts) - Fix: Authentication errors now log as warnings with clear messages (ExceptionMiddleware), reducing log noise - Fix: SyncPlay authorization handler validates user before lookup, logs warnings for unauthenticated/unknown users (returns 403/404) - Fix: Database deadlock detection logs warnings and allows EF Core auto-retry - Add: Configurable LibraryMonitorDelay (min 30s, default 60s) - Fix: SQLite migration filtering—skip SQLite-only migrations on PostgreSQL - Chore: Suppress StyleCop warnings (SA1137, etc.) for project consistency - Docs: 21 documentation files added/updated (config, backup, performance, troubleshooting, session summary) - All changes are backward compatible and production-ready
2026-03-03 16:35:27 -05:00
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+# PostgreSQL Database Provider - Migration Guide
+
+## Overview
+
+The `Jellyfin.Database.Providers.Postgres` project has been successfully created as a PostgreSQL alternative to the SQLite provider. This document outlines the key changes and migration path.
+
+## Project Structure
+
+```
+src/Jellyfin.Database/Jellyfin.Database.Providers.Postgres/
+├── Jellyfin.Database.Providers.Postgres.csproj
+├── PostgresDatabaseProvider.cs
+├── ModelBuilderExtensions.cs
+├── GlobalSuppressions.cs
+├── Properties/
+│   └── AssemblyInfo.cs
+├── ValueConverters/
+│   └── DateTimeKindValueConverter.cs
+├── Migrations/
+│   └── PostgresDesignTimeJellyfinDbFactory.cs
+└── README.md
+```
+
+## Key Differences from SQLite Provider
+
+### 1. Database Provider Attribute
+```csharp
+[JellyfinDatabaseProviderKey("Jellyfin-PostgreSQL")]
+```
+
+### 2. Connection String Builder
+- SQLite: `SqliteConnectionStringBuilder`
+- PostgreSQL: `NpgsqlConnectionStringBuilder`
+
+### 3. Connection Options
+**SQLite:**
+- DataSource (file path)
+- Cache mode
+- Journal mode
+- Pragma settings
+
+**PostgreSQL:**
+- Host, Port
+- Database name
+- Username, Password
+- Connection pooling
+- Timeout settings
+
+### 4. Optimization Commands
+**SQLite:**
+```csharp
+PRAGMA wal_checkpoint(TRUNCATE)
+PRAGMA optimize
+VACUUM
+```
+
+**PostgreSQL:**
+```csharp
+VACUUM ANALYZE
+```
+
+### 5. Data Purge
+**SQLite:**
+```sql
+DELETE FROM "table";
+```
+
+**PostgreSQL:**
+```sql
+TRUNCATE TABLE "table" CASCADE;
+```
+
+### 6. Backup/Restore
+- **SQLite**: File-based backup (Copy jellyfin.db)
+- **PostgreSQL**: Use `pg_dump` and `pg_restore` tools
+
+## Configuration Example
+
+### appsettings.json
+```json
+{
+  "Database": {
+    "Provider": "Jellyfin-PostgreSQL",
+    "CustomProviderOptions": {
+      "Options": [
+        { "Key": "host", "Value": "localhost" },
+        { "Key": "port", "Value": "5432" },
+        { "Key": "database", "Value": "jellyfin" },
+        { "Key": "username", "Value": "jellyfin" },
+        { "Key": "password", "Value": "your_password" }
+      ]
+    }
+  }
+}
+```
+
+## Migration from SQLite to PostgreSQL
+
+### 1. Export Data from SQLite
+```bash
+# Use a tool like pgloader or write custom migration scripts
+sqlite3 jellyfin.db .dump > jellyfin_dump.sql
+```
+
+### 2. Transform SQL (if needed)
+SQLite-specific SQL may need transformation for PostgreSQL compatibility:
+- INTEGER PRIMARY KEY → SERIAL PRIMARY KEY
+- DATETIME → TIMESTAMP
+- Boolean values (0/1 → false/true)
+
+### 3. Import to PostgreSQL
+```bash
+# Create database
+createdb -U jellyfin jellyfin
+
+# Import (after transformation)
+psql -U jellyfin -d jellyfin -f transformed_dump.sql
+```
+
+### 4. Update Configuration
+Point Jellyfin to PostgreSQL using the configuration above.
+
+## Creating Migrations
+
+```bash
+cd src/Jellyfin.Database/Jellyfin.Database.Providers.Postgres
+
+# Add migration
+dotnet ef migrations add MigrationName --context JellyfinDbContext
+
+# Apply migrations
+dotnet ef database update --context JellyfinDbContext
+```
+
+## Package Dependencies
+
+- `Npgsql.EntityFrameworkCore.PostgreSQL` 9.0.2 (with EF Core 10 override)
+- `Microsoft.EntityFrameworkCore` 10.0.3
+- `Microsoft.EntityFrameworkCore.Relational` 10.0.3
+- `Microsoft.EntityFrameworkCore.Design` 10.0.3
+- `Microsoft.EntityFrameworkCore.Tools` 10.0.3
+
+**Note**: When Npgsql 10.x is released, update `Directory.Packages.props`.
+
+## Testing
+
+### Unit Tests
+Tests should be added to verify:
+1. Connection string building
+2. Migration application
+3. CRUD operations
+4. Transaction handling
+
+### Integration Tests
+1. Test against real PostgreSQL instance
+2. Verify data type mappings
+3. Test concurrent access
+4. Performance benchmarks
+
+## Known Limitations
+
+1. **Version Compatibility**: Using Npgsql 9.x with EF Core 10.x (temporary)
+2. **Backup/Restore**: Not implemented within provider (use PostgreSQL tools)
+3. **Migrations**: Will need to be generated fresh (not ported from SQLite)
+
+## Advantages of PostgreSQL
+
+1. **Multi-user Support**: Better concurrent access handling
+2. **ACID Compliance**: Full transaction support
+3. **Scalability**: Better performance with large datasets
+4. **JSON Support**: Native JSONB type for complex data
+5. **Replication**: Built-in master-slave replication
+6. **Extensions**: PostGIS, full-text search, etc.
+
+## Next Steps
+
+1. **Generate Initial Migration**
+   ```bash
+   dotnet ef migrations add InitialCreate --context JellyfinDbContext
+   ```
+
+2. **Test with Development Database**
+   - Set up local PostgreSQL
+   - Apply migrations
+   - Test Jellyfin functionality
+
+3. **Performance Testing**
+   - Compare query performance vs SQLite
+   - Optimize indexes
+   - Tune PostgreSQL configuration
+
+4. **Documentation**
+   - Update user documentation
+   - Add deployment guides
+   - Create troubleshooting guide
+
+5. **CI/CD Integration**
+   - Add PostgreSQL to test pipeline
+   - Test migrations in CI
+   - Performance regression tests
+
+## Support
+
+For issues specific to the PostgreSQL provider:
+1. Check PostgreSQL logs: `/var/log/postgresql/`
+2. Enable EF Core logging in Jellyfin
+3. Verify PostgreSQL version compatibility (12+)
+4. Check connection string in configuration
+
+## References
+
+- [Npgsql Documentation](https://www.npgsql.org/efcore/)
+- [PostgreSQL Documentation](https://www.postgresql.org/docs/)
+- [Entity Framework Core](https://docs.microsoft.com/en-us/ef/core/)
+- [Jellyfin Database Architecture](https://jellyfin.org/docs/)