diff --git a/compose.postgres.yml b/compose.postgres.yml
new file mode 100644
index 0000000..025dcc3
--- /dev/null
+++ b/compose.postgres.yml
@@ -0,0 +1,9 @@
+version: '3.3'
+services:
+  postgres:
+    image: 'daocloud.io/library/postgres'
+    environment:
+      POSTGRES_PASSWORD: mysecretpassword
+
+    ports:
+      - '5432:5432'
diff --git a/dtmsvr/dtmsvr.postgres.sql b/dtmsvr/dtmsvr.postgres.sql
new file mode 100644
index 0000000..e69de29
diff --git a/dtmsvr/dtmsvr.sql b/dtmsvr/dtmsvr.sql
index 3f781ce..af42fa0 100644
--- a/dtmsvr/dtmsvr.sql
+++ b/dtmsvr/dtmsvr.sql
@@ -38,7 +38,7 @@ CREATE TABLE IF NOT EXISTS dtm.trans_branch (
   `create_time` datetime DEFAULT NULL,
   `update_time` datetime DEFAULT NULL,
   PRIMARY KEY (`id`),
-  UNIQUE KEY `gid` (`gid`,`branch_id`, `branch_type`),
+  UNIQUE KEY `gid_uniq` (`gid`,`branch_id`, `branch_type`),
   KEY `create_time` (`create_time`),
   KEY `update_time` (`update_time`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
diff --git a/examples/examples. postgres.sql b/examples/examples. postgres.sql
new file mode 100644
index 0000000..e69de29