diff --git a/lightrag/kg/postgres_impl.py b/lightrag/kg/postgres_impl.py
index cbbd98c7..c91d23f0 100644
--- a/lightrag/kg/postgres_impl.py
+++ b/lightrag/kg/postgres_impl.py
@@ -254,6 +254,8 @@ class PGKVStorage(BaseKVStorage):
     db: PostgreSQLDB = field(default=None)
 
     def __post_init__(self):
+        namespace_prefix = self.global_config.get("namespace_prefix")
+        self.base_namespace = self.namespace.replace(namespace_prefix, "")
         self._max_batch_size = self.global_config["embedding_batch_num"]
 
     async def initialize(self):
@@ -269,7 +271,7 @@ class PGKVStorage(BaseKVStorage):
 
     async def get_by_id(self, id: str) -> dict[str, Any] | None:
         """Get doc_full data by id."""
-        sql = SQL_TEMPLATES["get_by_id_" + self.namespace]
+        sql = SQL_TEMPLATES["get_by_id_" + self.base_namespace]
         params = {"workspace": self.db.workspace, "id": id}
         if is_namespace(self.namespace, NameSpace.KV_STORE_LLM_RESPONSE_CACHE):
             array_res = await self.db.query(sql, params, multirows=True)
@@ -283,7 +285,7 @@ class PGKVStorage(BaseKVStorage):
 
     async def get_by_mode_and_id(self, mode: str, id: str) -> Union[dict, None]:
         """Specifically for llm_response_cache."""
-        sql = SQL_TEMPLATES["get_by_mode_id_" + self.namespace]
+        sql = SQL_TEMPLATES["get_by_mode_id_" + self.base_namespace]
         params = {"workspace": self.db.workspace, mode: mode, "id": id}
         if is_namespace(self.namespace, NameSpace.KV_STORE_LLM_RESPONSE_CACHE):
             array_res = await self.db.query(sql, params, multirows=True)
@@ -297,7 +299,7 @@ class PGKVStorage(BaseKVStorage):
     # Query by id
     async def get_by_ids(self, ids: list[str]) -> list[dict[str, Any]]:
         """Get doc_chunks data by id"""
-        sql = SQL_TEMPLATES["get_by_ids_" + self.namespace].format(
+        sql = SQL_TEMPLATES["get_by_ids_" + self.base_namespace].format(
             ids=",".join([f"'{id}'" for id in ids])
         )
         params = {"workspace": self.db.workspace}
@@ -318,7 +320,7 @@ class PGKVStorage(BaseKVStorage):
 
     async def get_by_status(self, status: str) -> Union[list[dict[str, Any]], None]:
         """Specifically for llm_response_cache."""
-        SQL = SQL_TEMPLATES["get_by_status_" + self.namespace]
+        SQL = SQL_TEMPLATES["get_by_status_" + self.base_namespace]
         params = {"workspace": self.db.workspace, "status": status}
         return await self.db.query(SQL, params, multirows=True)
 
@@ -391,6 +393,8 @@ class PGVectorStorage(BaseVectorStorage):
 
     def __post_init__(self):
         self._max_batch_size = self.global_config["embedding_batch_num"]
+        namespace_prefix = self.global_config.get("namespace_prefix")
+        self.base_namespace = self.namespace.replace(namespace_prefix, "")
         config = self.global_config.get("vector_db_storage_cls_kwargs", {})
         cosine_threshold = config.get("cosine_better_than_threshold")
         if cosine_threshold is None:
@@ -493,7 +497,9 @@ class PGVectorStorage(BaseVectorStorage):
         embedding = embeddings[0]
         embedding_string = ",".join(map(str, embedding))
 
-        sql = SQL_TEMPLATES[self.namespace].format(embedding_string=embedding_string)
+        sql = SQL_TEMPLATES[self.base_namespace].format(
+            embedding_string=embedding_string
+        )
         params = {
             "workspace": self.db.workspace,
             "better_than_threshold": self.cosine_better_than_threshold,