scripts/pgvector_spike.py probes Immich's Postgres read-only (session-level
read-only guard) and answers the M1.5 prerequisites against the live DB:
catalog-discovered embedding table/column, vector dimension, distance operator
(from the index opclass), the embedding->asset FK join, and coverage over the
IMAGE population. Discovers the asset table name from the FK (asset, not the
legacy assets) rather than hardcoding it, so it survives Immich version drift.
Findings (this Immich version): smart_search.embedding, 1152-dim, cosine <=>
(vector_cosine_ops), assetId->asset.id join clean (0 orphans), ~44% image
coverage (CLIP re-run in progress). Doc is M1.5's version-pinned contract.
