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A structural sweep of the deployed schema, run AFTER 0088 got the models and the chain to exact agreement. That agreement is what 0088 achieved, and it is worth naming what it does not prove: a models-vs-chain diff shows the two describe the same schema, not that the schema is right. Everything here was wrong in BOTH. The one that matters: image_tag has PRIMARY KEY (image_record_id, tag_id) and no other index, so tag_id is unindexed. That is the gallery's tag filter (tag_query.py builds `image_tag.c.tag_id == tid`) and the ON DELETE CASCADE from tag, both scanning the largest table in the schema. Six more FKs were unindexed on smaller tables; presentation_review.tag_id also CASCADEs. Dropped, on the other side: ix_image_record_sha256 was an exact duplicate of the index uq_image_record_sha256 already builds — two btrees on the same column of the highest-insert-rate table. The other six are single-column indexes a later composite superseded without the narrow one being retired; a btree on (a,b) already serves lookups on a. 0088 deliberately taught the models to declare BOTH sha256 indexes so they would describe reality. This changes the reality instead, and the models change with it — otherwise the next baseline.yml run reintroduces exactly the drift 0088 removed. CONCURRENTLY throughout, so building the image_tag index does not hold an ACCESS EXCLUSIVE lock over every write for the duration. The cost is that the migration cannot run in a transaction and so is not atomic: every statement is IF NOT EXISTS / IF EXISTS, making a re-run after a partial failure safe. The docstring carries the query for finding an INVALID index left by an interrupted CONCURRENTLY build. What the sweep found clean, for the record: all 43 tables have a primary key; all 51 FKs declare an explicit ON DELETE, so none silently blocks a delete; the three enum CHECKs match the code that writes them (rule 36). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017QHszn9H8VBvx5Ke8x1hvw