-- 009_notes_embedding.sql
-- Adds vector embedding column to notes for semantic search.
-- Uses the same vector(3072) dimension as kb_chunks for uniformity.

ALTER TABLE notes ADD COLUMN IF NOT EXISTS embedding vector(3072);

-- NOTE: pgvector HNSW indexes are limited to 2000 dimensions.
-- For 3072-dim vectors, IVFFlat is the option but requires training
-- data (rows). The notes table is typically small enough that a
-- sequential scan is fast. If needed, create after data exists:
--   CREATE INDEX idx_notes_embedding ON notes
--       USING ivfflat (embedding vector_cosine_ops) WITH (lists = 100);