fix: consider delete successful if doc was not in db (#107)

Signed-off-by: Anupam Kumar <kyteinsky@gmail.com>

context_chat_backend/vectordb/pgvector.py

@@ -145,10 +145,7 @@ def delete(self, user_id: str, metadata_key: str, values: list[str]) -> bool:
 				.filter(client.EmbeddingStore.cmetadata[metadata_key].in_([sa.cast(f'"{v}"', JSONB) for v in values]))
 			)
 
-			result = session.execute(stmt)
+			session.execute(stmt)
 			session.commit()
 
-			if result.rowcount == 0:
-				return False
-
 		return True