Critical fixes for training session logging:
1. Training log race condition fix:
- Add explicit session commits after creating training logs
- Handle duplicate key errors gracefully when multiple sessions
try to create the same log simultaneously
- Implement retry logic to query for existing logs after
duplicate key violations
- Prevents "Training log not found" errors during training
2. Audit event async generator error fix:
- Replace incorrect next(get_db()) usage with proper
async context manager (database_manager.get_session())
- Fixes "'async_generator' object is not an iterator" error
- Ensures audit logging works correctly
These changes address race conditions in concurrent database
sessions and ensure training logs are properly synchronized
across the training pipeline.