diff --git a/lightrag/kg/postgres_impl.py b/lightrag/kg/postgres_impl.py
index e2ed10c1..6a3e7c5f 100644
--- a/lightrag/kg/postgres_impl.py
+++ b/lightrag/kg/postgres_impl.py
@@ -1556,7 +1556,7 @@ TABLES = {
                     content_vector VECTOR,
                     create_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                     update_time TIMESTAMP,
-                    chunk_id VARCHAR(255) NULL,
+                    chunk_id TEXT NULL,
 	                CONSTRAINT LIGHTRAG_VDB_ENTITY_PK PRIMARY KEY (workspace, id)
                     )"""
     },
@@ -1570,7 +1570,7 @@ TABLES = {
                     content_vector VECTOR,
                     create_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                     update_time TIMESTAMP,
-                    chunk_id VARCHAR(255) NULL,
+                    chunk_id TEXT NULL,
 	                CONSTRAINT LIGHTRAG_VDB_RELATION_PK PRIMARY KEY (workspace, id)
                     )"""
     },