Lukas 12681720e9 fix: process image loading batch sequentially to avoid concurrent AsyncSession use ...

SQLAlchemy async sessions are not safe for concurrent operations. load_series_images_batch was using asyncio.gather to run multiple load_series_images calls concurrently, all sharing the same db session. This caused 'session is provisioning a new connection; concurrent operations are not permitted' errors for every series in the batch.

Fix by processing each batch sequentially instead of concurrently. BATCH_SIZE=10 still paces TMDB requests as intended.

2026-07-31 09:09:04 +02:00

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