diff --git a/examples/graph_visual_with_html.py b/examples/graph_visual_with_html.py
index c1a6a015..56ed43cc 100644
--- a/examples/graph_visual_with_html.py
+++ b/examples/graph_visual_with_html.py
@@ -1,9 +1,11 @@
-import networkx as nx
 import pipmaster as pm
 
 if not pm.is_installed("pyvis"):
     pm.install("pyvis")
+if not pm.is_installed("networkx"):
+    pm.install("networkx")
 
+import networkx as nx
 from pyvis.network import Network
 import random
 
diff --git a/lightrag/kg/mongo_impl.py b/lightrag/kg/mongo_impl.py
index c7b16a70..a6e6edfd 100644
--- a/lightrag/kg/mongo_impl.py
+++ b/lightrag/kg/mongo_impl.py
@@ -797,8 +797,8 @@ class MongoGraphStorage(BaseGraphStorage):
 @final
 @dataclass
 class MongoVectorDBStorage(BaseVectorStorage):
-    db: AsyncIOMotorDatabase = field(default=None)
-    _data: AsyncIOMotorCollection = field(default=None)
+    db: AsyncIOMotorDatabase | None = field(default=None)
+    _data: AsyncIOMotorCollection | None = field(default=None)
 
     def __post_init__(self):
         kwargs = self.global_config.get("vector_db_storage_cls_kwargs", {})
diff --git a/lightrag/kg/neo4j_impl.py b/lightrag/kg/neo4j_impl.py
index 03b1bbcb..82631cf8 100644
--- a/lightrag/kg/neo4j_impl.py
+++ b/lightrag/kg/neo4j_impl.py
@@ -43,10 +43,6 @@ config.read("config.ini", "utf-8")
 @final
 @dataclass
 class Neo4JStorage(BaseGraphStorage):
-    @staticmethod
-    def load_nx_graph(file_name):
-        print("no preloading of graph with neo4j in production")
-
     def __init__(self, namespace, global_config, embedding_func):
         super().__init__(
             namespace=namespace,
diff --git a/lightrag/kg/networkx_impl.py b/lightrag/kg/networkx_impl.py
index ac321d24..313d9f8d 100644
--- a/lightrag/kg/networkx_impl.py
+++ b/lightrag/kg/networkx_impl.py
@@ -15,11 +15,10 @@ from lightrag.base import (
 )
 import pipmaster as pm
 
-if not pm.is_installed("graspologic"):
-    pm.install("graspologic")
-
 if not pm.is_installed("networkx"):
     pm.install("networkx")
+if not pm.is_installed("graspologic"):
+    pm.install("graspologic")
 
 try:
     from graspologic import embed
diff --git a/lightrag/kg/oracle_impl.py b/lightrag/kg/oracle_impl.py
index 3e0c6799..0916f6b0 100644
--- a/lightrag/kg/oracle_impl.py
+++ b/lightrag/kg/oracle_impl.py
@@ -178,11 +178,11 @@ class OracleDB:
 
 
 class ClientManager:
-    _instances = {"db": None, "ref_count": 0}
+    _instances: dict[str, Any] = {"db": None, "ref_count": 0}
     _lock = asyncio.Lock()
 
     @staticmethod
-    def get_config():
+    def get_config() -> dict[str, Any]:
         config = configparser.ConfigParser()
         config.read("config.ini", "utf-8")
 
@@ -398,7 +398,7 @@ class OracleKVStorage(BaseKVStorage):
 @final
 @dataclass
 class OracleVectorDBStorage(BaseVectorStorage):
-    db: OracleDB = field(default=None)
+    db: OracleDB | None = field(default=None)
 
     def __post_init__(self):
         config = self.global_config.get("vector_db_storage_cls_kwargs", {})
diff --git a/lightrag/kg/postgres_impl.py b/lightrag/kg/postgres_impl.py
index fd560668..044bf4c1 100644
--- a/lightrag/kg/postgres_impl.py
+++ b/lightrag/kg/postgres_impl.py
@@ -1,10 +1,9 @@
 import asyncio
-import inspect
 import json
 import os
 import time
 from dataclasses import dataclass, field
-from typing import Any, Dict, List, Union, final
+from typing import Any, Union, final
 import numpy as np
 import configparser
 
@@ -41,6 +40,7 @@ if not pm.is_installed("asyncpg"):
 
 try:
     import asyncpg
+    from asyncpg import Pool
 
 except ImportError as e:
     raise ImportError(
@@ -49,8 +49,7 @@ except ImportError as e:
 
 
 class PostgreSQLDB:
-    def __init__(self, config, **kwargs):
-        self.pool = None
+    def __init__(self, config: dict[str, Any], **kwargs: Any):
         self.host = config.get("host", "localhost")
         self.port = config.get("port", 5432)
         self.user = config.get("user", "postgres")
@@ -59,7 +58,7 @@ class PostgreSQLDB:
         self.workspace = config.get("workspace", "default")
         self.max = 12
         self.increment = 1
-        logger.info(f"Using the label {self.workspace} for PostgreSQL as identifier")
+        self.pool: Pool | None = None
 
         if self.user is None or self.password is None or self.database is None:
             raise ValueError(
@@ -68,7 +67,7 @@ class PostgreSQLDB:
 
     async def initdb(self):
         try:
-            self.pool = await asyncpg.create_pool(
+            self.pool = await asyncpg.create_pool(  # type: ignore
                 user=self.user,
                 password=self.password,
                 database=self.database,
@@ -79,43 +78,51 @@ class PostgreSQLDB:
             )
 
             logger.info(
-                f"Connected to PostgreSQL database at {self.host}:{self.port}/{self.database}"
+                f"PostgreSQL, Connected to database at {self.host}:{self.port}/{self.database}"
             )
         except Exception as e:
             logger.error(
-                f"Failed to connect to PostgreSQL database at {self.host}:{self.port}/{self.database}"
+                f"PostgreSQL, Failed to connect database at {self.host}:{self.port}/{self.database}, Got:{e}"
             )
-            logger.error(f"PostgreSQL database error: {e}")
             raise
 
+    async def check_graph_requirement(self, graph_name: str):
+        async with self.pool.acquire() as connection:  # type: ignore
+            try:
+                await connection.execute(
+                    'SET search_path = ag_catalog, "$user", public'
+                )  # type: ignore
+                await connection.execute(f"select create_graph('{graph_name}')")  # type: ignore
+            except (
+                asyncpg.exceptions.InvalidSchemaNameError,
+                asyncpg.exceptions.UniqueViolationError,
+            ):
+                pass
+
     async def check_tables(self):
         for k, v in TABLES.items():
             try:
                 await self.query(f"SELECT 1 FROM {k} LIMIT 1")
             except Exception as e:
-                logger.error(f"Failed to check table {k} in PostgreSQL database")
                 logger.error(f"PostgreSQL database error: {e}")
                 try:
+                    logger.info(f"PostgreSQL, Try Creating table {k} in database")
                     await self.execute(v["ddl"])
-                    logger.info(f"Created table {k} in PostgreSQL database")
+                    logger.info(f"PostgreSQL, Created table {k} in PostgreSQL database")
                 except Exception as e:
-                    logger.error(f"Failed to create table {k} in PostgreSQL database")
-                    logger.error(f"PostgreSQL database error: {e}")
-
-        logger.info("Finished checking all tables in PostgreSQL database")
+                    logger.error(
+                        f"PostgreSQL, Failed to create table {k} in database, Please verify the connection with PostgreSQL database, Got: {e}"
+                    )
+                    raise e
 
     async def query(
         self,
         sql: str,
-        params: dict = None,
+        params: dict[str, Any] | None = None,
         multirows: bool = False,
-        for_age: bool = False,
-        graph_name: str = None,
-    ) -> Union[dict, None, list[dict]]:
-        async with self.pool.acquire() as connection:
+    ) -> dict[str, Any] | None | list[dict[str, Any]]:
+        async with self.pool.acquire() as connection:  # type: ignore
             try:
-                if for_age:
-                    await PostgreSQLDB._prerequisite(connection, graph_name)
                 if params:
                     rows = await connection.fetch(sql, *params.values())
                 else:
@@ -143,20 +150,15 @@ class PostgreSQLDB:
     async def execute(
         self,
         sql: str,
-        data: Union[list, dict] = None,
-        for_age: bool = False,
-        graph_name: str = None,
+        data: dict[str, Any] | None = None,
         upsert: bool = False,
     ):
         try:
-            async with self.pool.acquire() as connection:
-                if for_age:
-                    await PostgreSQLDB._prerequisite(connection, graph_name)
-
+            async with self.pool.acquire() as connection:  # type: ignore
                 if data is None:
-                    await connection.execute(sql)
+                    await connection.execute(sql)  # type: ignore
                 else:
-                    await connection.execute(sql, *data.values())
+                    await connection.execute(sql, *data.values())  # type: ignore
         except (
             asyncpg.exceptions.UniqueViolationError,
             asyncpg.exceptions.DuplicateTableError,
@@ -169,24 +171,13 @@ class PostgreSQLDB:
             logger.error(f"PostgreSQL database,\nsql:{sql},\ndata:{data},\nerror:{e}")
             raise
 
-    @staticmethod
-    async def _prerequisite(conn: asyncpg.Connection, graph_name: str):
-        try:
-            await conn.execute('SET search_path = ag_catalog, "$user", public')
-            await conn.execute(f"""select create_graph('{graph_name}')""")
-        except (
-            asyncpg.exceptions.InvalidSchemaNameError,
-            asyncpg.exceptions.UniqueViolationError,
-        ):
-            pass
-
 
 class ClientManager:
-    _instances = {"db": None, "ref_count": 0}
+    _instances: dict[str, Any] = {"db": None, "ref_count": 0}
     _lock = asyncio.Lock()
 
     @staticmethod
-    def get_config():
+    def get_config() -> dict[str, Any]:
         config = configparser.ConfigParser()
         config.read("config.ini", "utf-8")
 
@@ -377,7 +368,7 @@ class PGKVStorage(BaseKVStorage):
 @final
 @dataclass
 class PGVectorStorage(BaseVectorStorage):
-    db: PostgreSQLDB = field(default=None)
+    db: PostgreSQLDB | None = field(default=None)
 
     def __post_init__(self):
         self._max_batch_size = self.global_config["embedding_batch_num"]
@@ -398,10 +389,10 @@ class PGVectorStorage(BaseVectorStorage):
             await ClientManager.release_client(self.db)
             self.db = None
 
-    def _upsert_chunks(self, item: dict):
+    def _upsert_chunks(self, item: dict[str, Any]) -> tuple[str, dict[str, Any]]:
         try:
             upsert_sql = SQL_TEMPLATES["upsert_chunk"]
-            data = {
+            data: dict[str, Any] = {
                 "workspace": self.db.workspace,
                 "id": item["__id__"],
                 "tokens": item["tokens"],
@@ -416,9 +407,9 @@ class PGVectorStorage(BaseVectorStorage):
 
         return upsert_sql, data
 
-    def _upsert_entities(self, item: dict):
+    def _upsert_entities(self, item: dict[str, Any]) -> tuple[str, dict[str, Any]]:
         upsert_sql = SQL_TEMPLATES["upsert_entity"]
-        data = {
+        data: dict[str, Any] = {
             "workspace": self.db.workspace,
             "id": item["__id__"],
             "entity_name": item["entity_name"],
@@ -427,9 +418,9 @@ class PGVectorStorage(BaseVectorStorage):
         }
         return upsert_sql, data
 
-    def _upsert_relationships(self, item: dict):
+    def _upsert_relationships(self, item: dict[str, Any]) -> tuple[str, dict[str, Any]]:
         upsert_sql = SQL_TEMPLATES["upsert_relationship"]
-        data = {
+        data: dict[str, Any] = {
             "workspace": self.db.workspace,
             "id": item["__id__"],
             "source_id": item["src_id"],
@@ -558,16 +549,16 @@ class PGDocStatusStorage(DocStatusStorage):
             )
 
     async def get_by_ids(self, ids: list[str]) -> list[dict[str, Any]]:
+        """Get doc_chunks data by id"""
         raise NotImplementedError
 
-    async def get_status_counts(self) -> Dict[str, int]:
+    async def get_status_counts(self) -> dict[str, int]:
         """Get counts of documents in each status"""
         sql = """SELECT status as "status", COUNT(1) as "count"
                    FROM LIGHTRAG_DOC_STATUS
                   where workspace=$1 GROUP BY STATUS
                  """
         result = await self.db.query(sql, {"workspace": self.db.workspace}, True)
-        # Result is like [{'status': 'PENDING', 'count': 1}, {'status': 'PROCESSING', 'count': 2}, ...]
         counts = {}
         for doc in result:
             counts[doc["status"]] = doc["count"]
@@ -575,7 +566,7 @@ class PGDocStatusStorage(DocStatusStorage):
 
     async def get_docs_by_status(
         self, status: DocStatus
-    ) -> Dict[str, DocProcessingStatus]:
+    ) -> dict[str, DocProcessingStatus]:
         """all documents with a specific status"""
         sql = "select * from LIGHTRAG_DOC_STATUS where workspace=$1 and status=$2"
         params = {"workspace": self.db.workspace, "status": status.value}
@@ -602,7 +593,7 @@ class PGDocStatusStorage(DocStatusStorage):
         """Update or insert document status
 
         Args:
-            data: Dictionary of document IDs and their status data
+            data: dictionary of document IDs and their status data
         """
         sql = """insert into LIGHTRAG_DOC_STATUS(workspace,id,content,content_summary,content_length,chunks_count,status)
                  values($1,$2,$3,$4,$5,$6,$7)
@@ -627,7 +618,6 @@ class PGDocStatusStorage(DocStatusStorage):
                     "status": v["status"],
                 },
             )
-        return data
 
     async def drop(self) -> None:
         """Drop the storage"""
@@ -638,7 +628,7 @@ class PGDocStatusStorage(DocStatusStorage):
 class PGGraphQueryException(Exception):
     """Exception for the AGE queries."""
 
-    def __init__(self, exception: Union[str, Dict]) -> None:
+    def __init__(self, exception: Union[str, dict[str, Any]]) -> None:
         if isinstance(exception, dict):
             self.message = exception["message"] if "message" in exception else "unknown"
             self.details = exception["details"] if "details" in exception else "unknown"
@@ -656,21 +646,19 @@ class PGGraphQueryException(Exception):
 @final
 @dataclass
 class PGGraphStorage(BaseGraphStorage):
-    db: PostgreSQLDB = field(default=None)
-
-    @staticmethod
-    def load_nx_graph(file_name):
-        print("no preloading of graph with AGE in production")
-
     def __post_init__(self):
         self.graph_name = self.namespace or os.environ.get("AGE_GRAPH_NAME", "lightrag")
         self._node_embed_algorithms = {
             "node2vec": self._node2vec_embed,
         }
+        self.db: PostgreSQLDB | None = None
 
     async def initialize(self):
         if self.db is None:
             self.db = await ClientManager.get_client()
+            # `check_graph_requirement` is required to be executed after `get_client`
+            # to ensure the graph is created before any query is executed.
+            await self.db.check_graph_requirement(self.graph_name)
 
     async def finalize(self):
         if self.db is not None:
@@ -682,7 +670,7 @@ class PGGraphStorage(BaseGraphStorage):
         pass
 
     @staticmethod
-    def _record_to_dict(record: asyncpg.Record) -> Dict[str, Any]:
+    def _record_to_dict(record: asyncpg.Record) -> dict[str, Any]:
         """
         Convert a record returned from an age query to a dictionary
 
@@ -690,7 +678,7 @@ class PGGraphStorage(BaseGraphStorage):
             record (): a record from an age query result
 
         Returns:
-            Dict[str, Any]: a dictionary representation of the record where
+            dict[str, Any]: a dictionary representation of the record where
                 the dictionary key is the field name and the value is the
                 value converted to a python type
         """
@@ -745,14 +733,14 @@ class PGGraphStorage(BaseGraphStorage):
 
     @staticmethod
     def _format_properties(
-        properties: Dict[str, Any], _id: Union[str, None] = None
+        properties: dict[str, Any], _id: Union[str, None] = None
     ) -> str:
         """
         Convert a dictionary of properties to a string representation that
         can be used in a cypher query insert/merge statement.
 
         Args:
-            properties (Dict[str,str]): a dictionary containing node/edge properties
+            properties (dict[str,str]): a dictionary containing node/edge properties
             _id (Union[str, None]): the id of the node or None if none exists
 
         Returns:
@@ -820,8 +808,11 @@ class PGGraphStorage(BaseGraphStorage):
         return field.replace("(", "_").replace(")", "")
 
     async def _query(
-        self, query: str, readonly: bool = True, upsert: bool = False
-    ) -> List[Dict[str, Any]]:
+        self,
+        query: str,
+        readonly: bool = True,
+        upsert: bool = False,
+    ) -> list[dict[str, Any]]:
         """
         Query the graph by taking a cypher query, converting it to an
         age compatible query, executing it and converting the result
@@ -831,32 +822,24 @@ class PGGraphStorage(BaseGraphStorage):
             params (dict): parameters for the query
 
         Returns:
-            List[Dict[str, Any]]: a list of dictionaries containing the result set
+            list[dict[str, Any]]: a list of dictionaries containing the result set
         """
-        # convert cypher query to pgsql/age query
-        wrapped_query = query
-
-        # execute the query, rolling back on an error
         try:
             if readonly:
                 data = await self.db.query(
-                    wrapped_query,
+                    query,
                     multirows=True,
-                    for_age=True,
-                    graph_name=self.graph_name,
                 )
             else:
                 data = await self.db.execute(
-                    wrapped_query,
-                    for_age=True,
-                    graph_name=self.graph_name,
+                    query,
                     upsert=upsert,
                 )
         except Exception as e:
             raise PGGraphQueryException(
                 {
                     "message": f"Error executing graph query: {query}",
-                    "wrapped": wrapped_query,
+                    "wrapped": query,
                     "detail": str(e),
                 }
             ) from e
@@ -865,12 +848,12 @@ class PGGraphStorage(BaseGraphStorage):
             result = []
         # decode records
         else:
-            result = [PGGraphStorage._record_to_dict(d) for d in data]
+            result = [self._record_to_dict(d) for d in data]
 
         return result
 
     async def has_node(self, node_id: str) -> bool:
-        entity_name_label = PGGraphStorage._encode_graph_label(node_id.strip('"'))
+        entity_name_label = self._encode_graph_label(node_id.strip('"'))
 
         query = """SELECT * FROM cypher('%s', $$
                      MATCH (n:Entity {node_id: "%s"})
@@ -878,18 +861,12 @@ class PGGraphStorage(BaseGraphStorage):
                    $$) AS (node_exists bool)""" % (self.graph_name, entity_name_label)
 
         single_result = (await self._query(query))[0]
-        logger.debug(
-            "{%s}:query:{%s}:result:{%s}",
-            inspect.currentframe().f_code.co_name,
-            query,
-            single_result["node_exists"],
-        )
 
         return single_result["node_exists"]
 
     async def has_edge(self, source_node_id: str, target_node_id: str) -> bool:
-        src_label = PGGraphStorage._encode_graph_label(source_node_id.strip('"'))
-        tgt_label = PGGraphStorage._encode_graph_label(target_node_id.strip('"'))
+        src_label = self._encode_graph_label(source_node_id.strip('"'))
+        tgt_label = self._encode_graph_label(target_node_id.strip('"'))
 
         query = """SELECT * FROM cypher('%s', $$
                      MATCH (a:Entity {node_id: "%s"})-[r]-(b:Entity {node_id: "%s"})
@@ -901,16 +878,11 @@ class PGGraphStorage(BaseGraphStorage):
         )
 
         single_result = (await self._query(query))[0]
-        logger.debug(
-            "{%s}:query:{%s}:result:{%s}",
-            inspect.currentframe().f_code.co_name,
-            query,
-            single_result["edge_exists"],
-        )
+
         return single_result["edge_exists"]
 
     async def get_node(self, node_id: str) -> dict[str, str] | None:
-        label = PGGraphStorage._encode_graph_label(node_id.strip('"'))
+        label = self._encode_graph_label(node_id.strip('"'))
         query = """SELECT * FROM cypher('%s', $$
                      MATCH (n:Entity {node_id: "%s"})
                      RETURN n
@@ -919,17 +891,12 @@ class PGGraphStorage(BaseGraphStorage):
         if record:
             node = record[0]
             node_dict = node["n"]
-            logger.debug(
-                "{%s}: query: {%s}, result: {%s}",
-                inspect.currentframe().f_code.co_name,
-                query,
-                node_dict,
-            )
+
             return node_dict
         return None
 
     async def node_degree(self, node_id: str) -> int:
-        label = PGGraphStorage._encode_graph_label(node_id.strip('"'))
+        label = self._encode_graph_label(node_id.strip('"'))
 
         query = """SELECT * FROM cypher('%s', $$
                      MATCH (n:Entity {node_id: "%s"})-[]->(x)
@@ -938,12 +905,7 @@ class PGGraphStorage(BaseGraphStorage):
         record = (await self._query(query))[0]
         if record:
             edge_count = int(record["total_edge_count"])
-            logger.debug(
-                "{%s}:query:{%s}:result:{%s}",
-                inspect.currentframe().f_code.co_name,
-                query,
-                edge_count,
-            )
+
             return edge_count
 
     async def edge_degree(self, src_id: str, tgt_id: str) -> int:
@@ -955,18 +917,14 @@ class PGGraphStorage(BaseGraphStorage):
         trg_degree = 0 if trg_degree is None else trg_degree
 
         degrees = int(src_degree) + int(trg_degree)
-        logger.debug(
-            "{%s}:query:src_Degree+trg_degree:result:{%s}",
-            inspect.currentframe().f_code.co_name,
-            degrees,
-        )
+
         return degrees
 
     async def get_edge(
         self, source_node_id: str, target_node_id: str
     ) -> dict[str, str] | None:
-        src_label = PGGraphStorage._encode_graph_label(source_node_id.strip('"'))
-        tgt_label = PGGraphStorage._encode_graph_label(target_node_id.strip('"'))
+        src_label = self._encode_graph_label(source_node_id.strip('"'))
+        tgt_label = self._encode_graph_label(target_node_id.strip('"'))
 
         query = """SELECT * FROM cypher('%s', $$
                      MATCH (a:Entity {node_id: "%s"})-[r]->(b:Entity {node_id: "%s"})
@@ -980,20 +938,15 @@ class PGGraphStorage(BaseGraphStorage):
         record = await self._query(query)
         if record and record[0] and record[0]["edge_properties"]:
             result = record[0]["edge_properties"]
-            logger.debug(
-                "{%s}:query:{%s}:result:{%s}",
-                inspect.currentframe().f_code.co_name,
-                query,
-                result,
-            )
+
             return result
 
     async def get_node_edges(self, source_node_id: str) -> list[tuple[str, str]] | None:
         """
         Retrieves all edges (relationships) for a particular node identified by its label.
-        :return: List of dictionaries containing edge information
+        :return: list of dictionaries containing edge information
         """
-        label = PGGraphStorage._encode_graph_label(source_node_id.strip('"'))
+        label = self._encode_graph_label(source_node_id.strip('"'))
 
         query = """SELECT * FROM cypher('%s', $$
                       MATCH (n:Entity {node_id: "%s"})
@@ -1024,8 +977,8 @@ class PGGraphStorage(BaseGraphStorage):
             if source_label and target_label:
                 edges.append(
                     (
-                        PGGraphStorage._decode_graph_label(source_label),
-                        PGGraphStorage._decode_graph_label(target_label),
+                        self._decode_graph_label(source_label),
+                        self._decode_graph_label(target_label),
                     )
                 )
 
@@ -1037,7 +990,7 @@ class PGGraphStorage(BaseGraphStorage):
         retry=retry_if_exception_type((PGGraphQueryException,)),
     )
     async def upsert_node(self, node_id: str, node_data: dict[str, str]) -> None:
-        label = PGGraphStorage._encode_graph_label(node_id.strip('"'))
+        label = self._encode_graph_label(node_id.strip('"'))
         properties = node_data
 
         query = """SELECT * FROM cypher('%s', $$
@@ -1047,18 +1000,14 @@ class PGGraphStorage(BaseGraphStorage):
                    $$) AS (n agtype)""" % (
             self.graph_name,
             label,
-            PGGraphStorage._format_properties(properties),
+            self._format_properties(properties),
         )
 
         try:
             await self._query(query, readonly=False, upsert=True)
-            logger.debug(
-                "Upserted node with label '{%s}' and properties: {%s}",
-                label,
-                properties,
-            )
+
         except Exception as e:
-            logger.error("Error during upsert: {%s}", e)
+            logger.error("POSTGRES, Error during upsert: {%s}", e)
             raise
 
     @retry(
@@ -1075,10 +1024,10 @@ class PGGraphStorage(BaseGraphStorage):
         Args:
             source_node_id (str): Label of the source node (used as identifier)
             target_node_id (str): Label of the target node (used as identifier)
-            edge_data (dict): Dictionary of properties to set on the edge
+            edge_data (dict): dictionary of properties to set on the edge
         """
-        src_label = PGGraphStorage._encode_graph_label(source_node_id.strip('"'))
-        tgt_label = PGGraphStorage._encode_graph_label(target_node_id.strip('"'))
+        src_label = self._encode_graph_label(source_node_id.strip('"'))
+        tgt_label = self._encode_graph_label(target_node_id.strip('"'))
         edge_properties = edge_data
 
         query = """SELECT * FROM cypher('%s', $$
@@ -1092,17 +1041,12 @@ class PGGraphStorage(BaseGraphStorage):
             self.graph_name,
             src_label,
             tgt_label,
-            PGGraphStorage._format_properties(edge_properties),
+            self._format_properties(edge_properties),
         )
-        # logger.info(f"-- inserting edge after formatted: {params}")
+
         try:
             await self._query(query, readonly=False, upsert=True)
-            logger.debug(
-                "Upserted edge from '{%s}' to '{%s}' with properties: {%s}",
-                src_label,
-                tgt_label,
-                edge_properties,
-            )
+
         except Exception as e:
             logger.error("Error during edge upsert: {%s}", e)
             raise
diff --git a/lightrag/kg/tidb_impl.py b/lightrag/kg/tidb_impl.py
index b94148d6..ed9c8d4b 100644
--- a/lightrag/kg/tidb_impl.py
+++ b/lightrag/kg/tidb_impl.py
@@ -58,7 +58,6 @@ class TiDB:
                 logger.error(f"Failed to check table {k} in TiDB database")
                 logger.error(f"TiDB database error: {e}")
                 try:
-                    # print(v["ddl"])
                     await self.execute(v["ddl"])
                     logger.info(f"Created table {k} in TiDB database")
                 except Exception as e:
@@ -106,11 +105,11 @@ class TiDB:
 
 
 class ClientManager:
-    _instances = {"db": None, "ref_count": 0}
+    _instances: dict[str, Any] = {"db": None, "ref_count": 0}
     _lock = asyncio.Lock()
 
     @staticmethod
-    def get_config():
+    def get_config() -> dict[str, Any]:
         config = configparser.ConfigParser()
         config.read("config.ini", "utf-8")
 
@@ -278,7 +277,7 @@ class TiDBKVStorage(BaseKVStorage):
 @final
 @dataclass
 class TiDBVectorDBStorage(BaseVectorStorage):
-    db: TiDB = field(default=None)
+    db: TiDB | None = field(default=None)
 
     def __post_init__(self):
         self._client_file_name = os.path.join(