-- Index vectoriel HNSW pour similarity search rapide (cosine)
CREATE INDEX IF NOT EXISTS idx_knowledge_chunks_embedding
  ON knowledge_chunks
  USING hnsw (embedding vector_cosine_ops)
  WITH (m = 16, ef_construction = 64);

-- Index fulltext PG (GIN sur tsvector)
CREATE INDEX IF NOT EXISTS idx_knowledge_chunks_content_tsv
  ON knowledge_chunks
  USING GIN (content_tsv);

-- Trigger pour maintenir content_tsv à jour automatiquement
CREATE OR REPLACE FUNCTION update_knowledge_chunks_tsv() RETURNS TRIGGER AS $$
BEGIN
  NEW.content_tsv := to_tsvector('russian', NEW.content) || to_tsvector('simple', NEW.content);
  RETURN NEW;
END;
$$ LANGUAGE plpgsql;

DROP TRIGGER IF EXISTS trg_knowledge_chunks_tsv ON knowledge_chunks;

CREATE TRIGGER trg_knowledge_chunks_tsv
  BEFORE INSERT OR UPDATE OF content ON knowledge_chunks
  FOR EACH ROW EXECUTE FUNCTION update_knowledge_chunks_tsv();