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The per-tag microsecond stagger preserves intra-batch order, but two back-to-back write batches on the same reference (e.g. set_reference_tags for path tags, then add_tags_to_reference for user tags) call get_utc_now() independently. On Windows the system clock can return the same datetime for both calls if no OS tick elapsed between the commits — both batches end up sharing microseconds and ORDER BY added_at, tag_name falls back to the alphabetic tiebreaker, sorting user tags ahead of path tags they were meant to follow. Add _next_added_at_base(reference_id) that reads max(existing added_at) and returns max(existing + 1us, get_utc_now()), guaranteeing the new batch sorts strictly after anything previously written for that reference. Used by set_reference_tags and add_tags_to_reference; batch_insert_seed_assets stays on raw get_utc_now() since seed inserts are always the first writes for a new reference. The accompanying regression test pins get_utc_now() to a frozen value so the previously-Windows-only race becomes a platform-independent failure mode under test.
Pytest Unit Tests
Install test dependencies
pip install -r tests-unit/requirements.txt
Run tests
pytest tests-unit/