fix(core): clean up delete vectors and cloud sync (#733)

Signed-off-by: phernandez <paul@basicmachines.co>

src/basic_memory/repository/search_repository.py

@@ -70,6 +70,10 @@ class SearchRepository(Protocol):
         """Sync semantic vector chunks for an entity."""
         ...
 
+    async def delete_entity_vector_rows(self, entity_id: int) -> None:
+        """Delete semantic vector chunks and embeddings for one entity."""
+        ...
+
     async def sync_entity_vectors_batch(
         self,
         entity_ids: list[int],

src/basic_memory/repository/search_repository_base.py

@@ -454,6 +454,15 @@ class SearchRepositoryBase(ABC):
             logger.debug(f"Query executed successfully in {elapsed_time:.2f}s.")
             return result
 
+    async def delete_entity_vector_rows(self, entity_id: int) -> None:
+        """Delete one entity's derived vector rows using the backend's cleanup path."""
+        await self._ensure_vector_tables()
+
+        async with db.scoped_session(self.session_maker) as session:
+            await self._prepare_vector_session(session)
+            await self._delete_entity_chunks(session, entity_id)
+            await session.commit()
+
     # ------------------------------------------------------------------
     # Shared semantic search: guard, text processing, chunking
     # ------------------------------------------------------------------

src/basic_memory/repository/sqlite_search_repository.py

@@ -565,21 +565,6 @@ class SQLiteSearchRepository(SearchRepositoryBase):
             stale_params,
         )
 
-    async def delete_entity_vector_rows(self, entity_id: int) -> None:
-        """Delete one entity's vec rows on a sqlite-vec-enabled connection."""
-        await self._ensure_vector_tables()
-
-        async with db.scoped_session(self.session_maker) as session:
-            await self._ensure_sqlite_vec_loaded(session)
-
-            # Constraint: sqlite-vec virtual tables are only visible after vec0 is
-            # loaded on this exact connection.
-            # Why: generic repository sessions can reach search_vector_chunks but still
-            #      fail with "no such module: vec0" when touching embeddings.
-            # Outcome: service-level cleanup routes vec-table deletes through this helper.
-            await self._delete_entity_chunks(session, entity_id)
-            await session.commit()
-
     async def delete_project_vector_rows(self) -> None:
         """Delete all vector rows for this project on a sqlite-vec-enabled connection."""
         await self._ensure_vector_tables()