Refactor. (#4487)

### What problem does this PR solve?

### Type of change

- [x] Refactoring

api/apps/kb_app.py

         if not e:
             return get_data_error_result(
                 message="Database error (Knowledgebase rename)!")
+        kb = kb.to_dict()
+        kb.update(req)
 
-        return get_json_result(data=kb.to_json())
+        return get_json_result(data=kb)
     except Exception as e:
         return server_error_response(e)
 

api/db/db_models.py

             )
         except Exception:
             pass
-        try:
-            DB.execute_sql('ALTER TABLE llm DROP PRIMARY KEY;')
-            DB.execute_sql('ALTER TABLE llm ADD PRIMARY KEY (llm_name,fid);')
-        except Exception:
-            pass
         try:
             migrate(
                 migrator.add_column('task', 'retry_count', IntegerField(default=0))

api/ragflow_server.py

 
 def update_progress():
     while True:
-        time.sleep(3)
+        time.sleep(6)
         try:
             DocumentService.update_progress()
         except Exception:

deepdoc/parser/resume/entities/corporations.py

 
 def corpNorm(nm, add_region=True):
     global CORP_TKS
-    if not nm or isinstance(nm, str):
+    if not nm or not isinstance(nm, str):
         return ""
     nm = rag_tokenizer.tradi2simp(rag_tokenizer.strQ2B(nm)).lower()
     nm = re.sub(r"&", "&", nm)

rag/utils/doc_store_conn.py

 from abc import ABC, abstractmethod
 from dataclasses import dataclass
 import numpy as np
-import polars as pl
 
 DEFAULT_MATCH_VECTOR_TOPN = 10
 DEFAULT_MATCH_SPARSE_TOPN = 10
             knowledgebaseIds: list[str],
             aggFields: list[str] = [],
             rank_feature: dict | None = None
-    ) -> list[dict] | pl.DataFrame:
+    ):
         """
         Search with given conjunctive equivalent filtering condition and return all fields of matched documents
         """