feat: 修改数据库迁移脚本和模型，创建用户表并定义User模型

db/migrations/20241022093001_create_users_table.js

@@ -1,4 +1,4 @@
-exports.up = function(knex) {
+export function up(knex) {
   return knex.schema.createTable('users', function(table) {
     table.increments('_id').primary().comment('主键ID');
     table.string('username', 255).notNullable().unique().comment('用户名');
@@ -13,8 +13,8 @@ exports.up = function(knex) {
     table.timestamp('_create').defaultTo(knex.fn.now()).comment('创建时间');
     table.timestamp('_update').defaultTo(knex.fn.now()).comment('更新时间');
   });
-};
+}
 
-exports.down = function(knex) {
+export function down(knex) {
   return knex.schema.dropTable('users');
-};
+}

db/models/User.js

@@ -1,6 +1,6 @@
-const { Model } = require('objection');
+import { Model } from 'objection';
 
-class User extends Model {
+export class User extends Model {
   static get tableName() {
     return 'users';
   }
@@ -26,4 +26,3 @@ class User extends Model {
   }
 }
 
-module.exports = User;

knexfile.js

@@ -1,5 +1,5 @@
 // knexfile.js
-module.exports = {
+export default {
   development: {
     client: 'mysql2',
     connection: {