refac: remove unused knowledge base accessors (#28794)

Three methods on KnowledgeTable have no callers anywhere in the repository. get_knowledge_bases_by_user_id loaded every knowledge base and filtered them in Python, which search_knowledge_bases already does in SQL with pagination. get_knowledge_by_id_and_user_id duplicates check_access_by_user_id with the permission hardcoded to write. update_knowledge_data_by_id writes a data column that a migration dropped, so it could only ever raise and return None through its own except block.

What remains is one per-entry access helper and one SQL-filtered list path, so nobody reaches for the slower or the broken variant by accident.

No behaviour change.

backend/open_webui/models/knowledge.py

@@ -484,24 +484,6 @@ class KnowledgeTable:
             db=db,
         )
 
-    async def get_knowledge_bases_by_user_id(
-        self, user_id: str, permission: str = 'write', db: Optional[AsyncSession] = None
-    ) -> list[KnowledgeUserModel]:
-        knowledge_bases = await self.get_knowledge_bases(db=db)
-        user_groups = await Groups.get_groups_by_member_id(user_id, db=db)
-        user_group_ids = {group.id for group in user_groups}
-
-        # One grants query for all non-owned knowledge bases instead of one each
-        accessible_ids = await AccessGrants.get_accessible_resource_ids(
-            user_id=user_id,
-            resource_type='knowledge',
-            resource_ids=[kb.id for kb in knowledge_bases if kb.user_id != user_id],
-            permission=permission,
-            user_group_ids=user_group_ids,
-            db=db,
-        )
-        return [kb for kb in knowledge_bases if kb.user_id == user_id or kb.id in accessible_ids]
-
     async def get_knowledge_by_id(self, id: str, db: Optional[AsyncSession] = None) -> Optional[KnowledgeModel]:
         try:
             async with get_async_db_context(db) as db:
@@ -511,29 +493,6 @@ class KnowledgeTable:
         except Exception:
             return None
 
-    async def get_knowledge_by_id_and_user_id(
-        self, id: str, user_id: str, db: Optional[AsyncSession] = None
-    ) -> Optional[KnowledgeModel]:
-        knowledge = await self.get_knowledge_by_id(id, db=db)
-        if not knowledge:
-            return None
-
-        if knowledge.user_id == user_id:
-            return knowledge
-
-        user_groups = await Groups.get_groups_by_member_id(user_id, db=db)
-        user_group_ids = {group.id for group in user_groups}
-        if await AccessGrants.has_access(
-            user_id=user_id,
-            resource_type='knowledge',
-            resource_id=knowledge.id,
-            permission='write',
-            user_group_ids=user_group_ids,
-            db=db,
-        ):
-            return knowledge
-        return None
-
     async def get_knowledges_by_file_id(self, file_id: str, db: Optional[AsyncSession] = None) -> list[KnowledgeModel]:
         try:
             async with get_async_db_context(db) as db:
@@ -808,25 +767,6 @@ class KnowledgeTable:
             log.exception(e)
             return None
 
-    async def update_knowledge_data_by_id(
-        self, id: str, data: dict, db: Optional[AsyncSession] = None
-    ) -> Optional[KnowledgeModel]:
-        try:
-            async with get_async_db_context(db) as db:
-                await db.execute(
-                    update(Knowledge)
-                    .filter_by(id=id)
-                    .values(
-                        data=data,
-                        updated_at=int(time.time()),
-                    )
-                )
-                await db.commit()
-                return await self.get_knowledge_by_id(id=id, db=db)
-        except Exception as e:
-            log.exception(e)
-            return None
-
     async def update_knowledge_meta_by_id(
         self, id: str, meta: dict, db: Optional[AsyncSession] = None
     ) -> Optional[KnowledgeModel]: