Fix: filed_map was incorrectly persisted (#7443)

### What problem does this PR solve?

Fix `filed_map` was incorrectly persisted. #7412 

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

api/apps/document_app.py

     pf_id = root_folder["id"]
     FileService.init_knowledgebase_docs(pf_id, current_user.id)
     errors = ""
+    kb_table_num_map = {}
     for doc_id in doc_ids:
         try:
             e, doc = DocumentService.get_by_id(doc_id)
             File2DocumentService.delete_by_document_id(doc_id)
             if deleted_file_count > 0:
                 STORAGE_IMPL.rm(b, n)
+
+            doc_parser = doc.parser_id
+            if doc_parser == ParserType.TABLE:
+                kb_id = doc.kb_id
+                if kb_id not in kb_table_num_map:
+                    counts = DocumentService.count_by_kb_id(kb_id=kb_id, keywords="", run_status=[TaskStatus.DONE], types=[])
+                    kb_table_num_map[kb_id] = counts
+                kb_table_num_map[kb_id] -= 1
+                if kb_table_num_map[kb_id] <= 0:
+                    KnowledgebaseService.delete_field_map(kb_id)
         except Exception as e:
             errors += str(e)
 
                 code=settings.RetCode.AUTHENTICATION_ERROR
             )
     try:
+        kb_table_num_map = {}
         for id in req["doc_ids"]:
             info = {"run": str(req["run"]), "progress": 0}
             if str(req["run"]) == TaskStatus.RUNNING.value and req.get("delete", False):
                 e, doc = DocumentService.get_by_id(id)
                 doc = doc.to_dict()
                 doc["tenant_id"] = tenant_id
+
+                doc_parser = doc.get("parser_id", ParserType.NAIVE)
+                if doc_parser == ParserType.TABLE:
+                    kb_id = doc.get("kb_id")
+                    if not kb_id:
+                        continue
+                    if kb_id not in kb_table_num_map:
+                        count = DocumentService.count_by_kb_id(kb_id=kb_id, keywords="", run_status=[TaskStatus.DONE], types=[])
+                        kb_table_num_map[kb_id] = count
+                        if kb_table_num_map[kb_id] <=0:
+                            KnowledgebaseService.delete_field_map(kb_id)
                 bucket, name = File2DocumentService.get_storage_address(doc_id=doc["id"])
                 queue_tasks(doc, bucket, name, 0)
 

api/db/services/document_service.py

 
         return list(docs.dicts()), count
 
+    @classmethod
+    @DB.connection_context()
+    def count_by_kb_id(cls, kb_id, keywords, run_status, types):
+        if keywords:
+            docs = cls.model.select().where(
+                (cls.model.kb_id == kb_id),
+                (fn.LOWER(cls.model.name).contains(keywords.lower()))
+            )
+        else:
+            docs = cls.model.select().where(cls.model.kb_id == kb_id)
+
+        if run_status:
+            docs = docs.where(cls.model.run.in_(run_status))
+        if types:
+            docs = docs.where(cls.model.type.in_(types))
+
+        count = docs.count()
+
+        return count
+
     @classmethod
     @DB.connection_context()
     def insert(cls, doc):

api/db/services/knowledgebase_service.py

         dfs_update(m.parser_config, config)
         cls.update_by_id(id, {"parser_config": m.parser_config})
 
+    @classmethod
+    @DB.connection_context()
+    def delete_field_map(cls, id):
+        e, m = cls.get_by_id(id)
+        if not e:
+            raise LookupError(f"knowledgebase({id}) not found.")
+
+        m.parser_config.pop("field_map", None)
+        cls.update_by_id(id, {"parser_config": m.parser_config})
+
     @classmethod
     @DB.connection_context()
     def get_field_map(cls, ids):