fix bugs

migrations/postgres/02128_server_config_override.sql

@@ -1,4 +1,3 @@
--- migrate:up
 CREATE TABLE IF NOT EXISTS "server_config_overrides"
 (
     "id"          BIGINT GENERATED BY DEFAULT AS IDENTITY NOT NULL,
@@ -13,6 +12,3 @@ CREATE TABLE IF NOT EXISTS "server_config_overrides"
     CONSTRAINT "uni_server_config_overrides_server_id" UNIQUE ("server_id")
 );
 
--- migrate:down
-DROP TABLE IF EXISTS "server_config_overrides";
-