bvandeusen
79cd1234e2
GalleryService.similar() ranks images by pgvector cosine distance to a source image's precomputed SigLIP embedding — no query-time ML inference. Composes with the Phase-1/2 scope filters (AND) but replaces the date sort (always nearest-first, bounded top-N, no cursor). Returns None for a missing source (→404), [] for a source with no embedding (video / pending ML); excludes self and NULL-embedding rows. New GET /api/gallery/similar?similar_to=<id>&limit=N. Image-detail payload gains has_embedding so the UI can hide the surface. Alembic 0036 adds an HNSW vector_cosine_ops index on siglip_embedding (1152<2000 dims) so the search is sub-50ms ANN instead of a full scan; one-time ~30-60s build over existing embeddings on deploy. Shared _gallery_images/_image_json helpers de-dup the scroll/similar builders. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>