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
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# EF Core Change Tracking Conflict Fix - BaseItemProvider UPSERT
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## Problem
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After implementing the UPSERT pattern for `BaseItemProvider`, encountered a new error:
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```
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System.InvalidOperationException: The instance of entity type 'BaseItemProvider' cannot be tracked
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because another instance with the key value '{ItemId: ..., ProviderId: Tmdb}' is already being tracked.
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```
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## Root Cause
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**EF Core Change Tracking Conflict:**
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1. When we load existing providers with `ToListAsync()`, they are automatically **tracked** by EF Core's change tracker
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2. Later, when we try to `Add()` a provider from `entity.Provider` collection, it might:
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- Already be tracked (if loaded earlier in the same context)
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- Have the same key as something already tracked
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3. EF Core throws an exception because it **can't track two entities with the same primary key**
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### The Problematic Code
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```csharp
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// Load existing providers - THESE GET TRACKED
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var existingProviders = await context.BaseItemProviders
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.Where(e => e.ItemId == entity.Id)
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.ToListAsync(cancellationToken); // ← Tracked!
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// Try to add from entity.Provider
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foreach (var provider in entity.Provider)
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{
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if (existing == null)
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{
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context.BaseItemProviders.Add(provider); // ← Error if already tracked!
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}
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}
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```
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## Solution: Use AsNoTracking and ExecuteUpdate
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### Key Changes
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1. **Load with `AsNoTracking()`** - Don't track the entities we load for comparison
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2. **Use `ExecuteUpdate()`** - Update existing providers without loading them into tracking
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3. **Create new entities** - When adding, create fresh instances instead of reusing tracked ones
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4. **Use `ExecuteDelete()`** - Delete obsolete providers without tracking
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### Fixed Code
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```csharp
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if (entity.Provider is { Count: > 0 })
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{
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// 1. Load existing providers WITHOUT tracking to avoid conflicts
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var existingProviders = await context.BaseItemProviders
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.AsNoTracking() // ← Key change: don't track these
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.Where(e => e.ItemId == entity.Id)
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.ToListAsync(cancellationToken);
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// 2. Remove providers that are no longer needed
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var providersToRemove = existingProviders
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.Where(existing => !entity.Provider.Any(p => p.ProviderId == existing.ProviderId))
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.Select(p => p.ProviderId)
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.ToList();
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if (providersToRemove.Any())
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{
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// Use ExecuteDelete - no tracking needed
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await context.BaseItemProviders
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.Where(p => p.ItemId == entity.Id && providersToRemove.Contains(p.ProviderId))
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.ExecuteDeleteAsync(cancellationToken);
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}
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// 3. Update or add providers
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foreach (var provider in entity.Provider)
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{
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var existing = existingProviders.FirstOrDefault(p => p.ProviderId == provider.ProviderId);
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if (existing != null)
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{
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// Use ExecuteUpdate - updates directly in database without tracking
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await context.BaseItemProviders
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.Where(p => p.ItemId == entity.Id && p.ProviderId == provider.ProviderId)
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.ExecuteUpdateAsync(
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setters => setters.SetProperty(p => p.ProviderValue, provider.ProviderValue),
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cancellationToken);
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}
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else
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{
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// Create NEW entity instance - avoid reusing tracked entities
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var newProvider = new BaseItemProvider
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{
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ItemId = entity.Id,
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Item = entity, // Navigation property
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ProviderId = provider.ProviderId,
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ProviderValue = provider.ProviderValue
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};
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context.BaseItemProviders.Add(newProvider);
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}
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}
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}
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```
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## Why This Works
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### AsNoTracking()
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```csharp
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.AsNoTracking()
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```
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- Loads entities for **read-only** purposes
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- EF Core **doesn't track** these entities
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- Prevents tracking conflicts when working with similar entities later
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### ExecuteUpdateAsync()
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```csharp
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.ExecuteUpdateAsync(setters => setters.SetProperty(...))
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```
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- **Directly updates database** without loading entities
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- **No tracking** - executes raw SQL UPDATE statement
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- More efficient - no change tracking overhead
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- Avoids conflicts - doesn't put entities in change tracker
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### ExecuteDeleteAsync()
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```csharp
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.ExecuteDeleteAsync()
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```
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- **Directly deletes from database** without loading entities
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- **No tracking** - executes raw SQL DELETE statement
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- More efficient than Load → Remove → SaveChanges
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### Create New Instances
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```csharp
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new BaseItemProvider { ItemId = ..., ProviderId = ..., ProviderValue = ... }
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```
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- Creates **fresh entity** not attached to any context
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- Can be safely added without conflicts
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- EF Core will track this new instance
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## Performance Benefits
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The new approach is actually **more efficient** than the original:
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| Operation | Old (Track & Modify) | New (ExecuteUpdate/Delete) |
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|-----------|---------------------|---------------------------|
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| **Update** | Load → Track → Modify → SaveChanges | ExecuteUpdate (direct SQL) |
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| **Delete** | Load → Track → Remove → SaveChanges | ExecuteDelete (direct SQL) |
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| **Insert** | Add → SaveChanges | Add → SaveChanges (same) |
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| **Memory** | All entities tracked | Only new entities tracked |
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| **DB Calls** | 1 SELECT + 1 UPDATE/DELETE | 1 UPDATE/DELETE (no SELECT) |
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## Testing
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### Before Fix
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```
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[ERR] System.InvalidOperationException: The instance of entity type 'BaseItemProvider'
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cannot be tracked because another instance with the key value {...} is already being tracked.
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```
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### After Fix
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```
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[INF] Metadata refresh completed successfully
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```
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### Test Cases
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1. **Update existing provider** - ExecuteUpdate runs, no tracking conflict
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2. **Add new provider** - New entity created, adds successfully
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3. **Remove obsolete provider** - ExecuteDelete runs, no tracking needed
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4. **Concurrent operations** - AsNoTracking prevents conflicts between contexts
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## Related Issues
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This fix also resolves potential issues with:
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- Concurrent metadata refreshes on the same item
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- Multiple save operations in the same context
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- Entity state conflicts in complex update scenarios
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## Files Modified
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- **`Jellyfin.Server.Implementations/Item/BaseItemRepository.cs`** (lines 892-966)
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- Changed from tracked queries to AsNoTracking + ExecuteUpdate/Delete
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- Create new instances when adding providers
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## Summary
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✅ **EF Core tracking conflicts resolved**
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✅ **More efficient** (fewer DB roundtrips)
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✅ **No constraint violations**
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✅ **Handles concurrency** better
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✅ **Cleaner code** (explicit about tracking behavior)
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The fix uses **modern EF Core patterns** (`ExecuteUpdate`, `ExecuteDelete`, `AsNoTracking`) to avoid change tracking complexity while maintaining correctness.
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