enhance(migrate):用户费用记录改为自增长序列类型。

migration/20220915101901_initialize.tx.up.sql

@@ -35,7 +35,7 @@ create table if not exists user_detail (
 
 create table if not exists user_charge (
     created_at timestamptz not null,
-    seq bigint not null primary key,
+    seq bigserial not null primary key,
     user_id varchar(120) not null,
     fee numeric(12,2),
     discount numeric(5,4),