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## Reprocessing a batch is rejected

Calling `batch.process` on a batch that already has a run now returns a conflict instead of silently starting a second run; concurrent calls collapse to a single run.

Read the docs

## Clearer ontology validation errors

Ontology validation errors now name the offending category and its actual count — for example, `entity_types cannot contain more than 10 items (got 11)` — instead of a single combined message.

Read the docs