fix(db): avoid crash

Author: Mte90

db/vector_operations.py

@@ -21,6 +21,7 @@
 # Retry policy for DB-locked operations
 DB_LOCK_RETRY_COUNT = 6
 DB_LOCK_RETRY_BASE_DELAY = 0.05  # seconds, exponential backoff multiplier
+_sqlite_vector_loaded = False
 
 
 def connect_db(db_path: str, timeout: float = 30.0) -> sqlite3.Connection:
@@ -58,9 +59,16 @@ def load_sqlite_vector_extension(conn: sqlite3.Connection) -> None:
     Raises:
         RuntimeError: If the extension fails to load
     """
+    global _sqlite_vector_loaded
+
+    if _sqlite_vector_loaded:
+        logger.debug("sqlite-vector: already loaded in-process, skipping load.")
+        return
+
     try:
         ext_path = importlib.resources.files(SQLITE_VECTOR_PKG) / SQLITE_VECTOR_RESOURCE
         conn.load_extension(str(ext_path))
+        _sqlite_vector_loaded = True
         try:
             conn.enable_load_extension(False)
         except Exception: