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fix(storage): preserve zero-row batches and concurrent lazy flushes - #550
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Compose OpenDCAI#550 with upstream main that already includes OpenDCAI#551. Integration candidate; needs current-head test and Manager review.
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… storage PR Preserve existing OpenDCAI#550 commits and test coverage while integrating upstream OpenDCAI#551 batched output cache invalidation.
Integrate original generation check and regression test on top of OpenDCAI#550 for independent concurrency validation.
Guard flush_step persistence across concurrent flush calls so an older snapshot cannot overwrite a newer committed generation. Preserve writes during flush and add deterministic JSONL/CSV regression coverage.
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Summary
This PR combines #549 and #550 into one storage fix for easier review.
It addresses two issues:
Changes
Testing
The changes are limited to the storage module and its tests.