:bug: fix for tale schema

backend/db/migrations/20220403111101_create_user_passwords_table.js

 exports.up = function (knex) {
     return knex.schema.createTable('user_identities', function (table) {
         table.increments('user_pw_id').primary()
-        table.increments('user_id').notNullable()
+        table.integer('user_id').notNullable()
         table.string('uname', 16)
         table.string('pw', 16)
         table.boolean('is_deleted').notNullable()