Feat/admin drop user (#10342)

### What problem does this PR solve?

- Admin client support drop user.

Issue: #10241 

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/db/services/document_service.py

@@ -228,6 +228,46 @@ class DocumentService(CommonService):
 
         return int(query.scalar()) or 0
 
+    @classmethod
+    @DB.connection_context()
+    def get_all_doc_ids_by_kb_ids(cls, kb_ids):
+        fields = [cls.model.id]
+        docs = cls.model.select(*fields).where(cls.model.kb_id.in_(kb_ids))
+        docs.order_by(cls.model.create_time.asc())
+        # maybe cause slow query by deep paginate, optimize later
+        offset, limit = 0, 100
+        res = []
+        while True:
+            doc_batch = docs.offset(offset).limit(limit)
+            _temp = list(doc_batch.dicts())
+            if not _temp:
+                break
+            res.extend(_temp)
+            offset += limit
+        return res
+
+    @classmethod
+    @DB.connection_context()
+    def get_all_docs_by_creator_id(cls, creator_id):
+        fields = [
+            cls.model.id, cls.model.kb_id, cls.model.token_num, cls.model.chunk_num, Knowledgebase.tenant_id
+        ]
+        docs = cls.model.select(*fields).join(Knowledgebase, on=(Knowledgebase.id == cls.model.kb_id)).where(
+            cls.model.created_by == creator_id
+        )
+        docs.order_by(cls.model.create_time.asc())
+        # maybe cause slow query by deep paginate, optimize later
+        offset, limit = 0, 100
+        res = []
+        while True:
+            doc_batch = docs.offset(offset).limit(limit)
+            _temp = list(doc_batch.dicts())
+            if not _temp:
+                break
+            res.extend(_temp)
+            offset += limit
+        return res
+
     @classmethod
     @DB.connection_context()
     def insert(cls, doc):