CREATE TABLE chunk_embeddings (
            chunk_id TEXT PRIMARY KEY,
            rel_path TEXT,
            embedding BLOB,
            content TEXT,
            mtime REAL
        );
0|chunk_id|TEXT|0||1
1|rel_path|TEXT|0||0
2|embedding|BLOB|0||0
3|content|TEXT|0||0
4|mtime|REAL|0||0
