bvandeusen
5a0e1bbd03
Item 1 of #3072. Both sweeps issued a single-row pg_insert(image_tag) from inside their per-image loop. Steady state that is nothing; a first sweep over a back-catalogue is one round-trip per applied tag, tens of thousands of them. Each chunk now collects its rows and writes them in one statement. The ticket suggested one insert per chunk PER TAG. A single multi-row VALUES carries every tag at once, so it is one statement per chunk full stop — and the sweeps already accumulate across all heads before they commit, so nothing had to be restructured to allow it. Not a new helper: wip_title.apply_wip_image_tags was already doing the chunked ON CONFLICT DO NOTHING insert, so that shape is extracted to services/image_tag_apply.insert_image_tags and all three writers share it. The extraction deliberately leaves wip_title's pre-SELECT behind rather than pulling it into the shared function — the sweeps don't need it (their `skip` sets already exclude applied and rejected images) and it exists only to produce an accurate count, which the sweeps also compute themselves. So the shared primitive returns nothing: psycopg reports rowcount -1 for a multi-row ON CONFLICT DO NOTHING insert, and a count taken from the statement would be a lie rather than an approximation. Ordering note for the system-tag sweep: tag rows are now written after that chunk's PresentationReview rows rather than interleaved before them. Safe — PresentationReview FKs to image_record and tag, not to image_tag. Chunk size stays 5000: 5000 rows x 3 bound params = 15000, inside Postgres' 65535-parameter ceiling with room to spare. tests/test_image_tag_apply.py covers the primitive directly, since it is now the single place three writers can be wrong at once — most importantly that a re-run never restamps a hand-applied tag's source, which would silently poison head training (it excludes the auto sources). Left alone: _insert_presentation_review is still per-row, and the retract path still deletes per-row. Both operate on sets that are small by construction, unlike the apply path. Refs #3072