diff --git a/backend/db/blueprint.sql b/backend/db/blueprint.sql
index d74b773..c0f9daf 100644
--- a/backend/db/blueprint.sql
+++ b/backend/db/blueprint.sql
@@ -9,6 +9,8 @@ CREATE TABLE IF NOT EXISTS `employees` (
     `id` INT AUTO_INCREMENT PRIMARY KEY,
     `store_id` INT NOT NULL,
     `name` VARCHAR(255) NOT NULL,
+    `password` VARCHAR(255) NOT NULL,
+    `role` ENUM('admin', 'staff') NOT NULL DEFAULT 'staff',
     FOREIGN KEY (`store_id`) REFERENCES `stores`(`id`) ON DELETE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
diff --git a/backend/db/migrations/20260730124014_create_stores_table.php b/backend/db/migrations/20260730124014_create_stores_table.php
index 8c7247f..b774fec 100644
--- a/backend/db/migrations/20260730124014_create_stores_table.php
+++ b/backend/db/migrations/20260730124014_create_stores_table.php
@@ -22,6 +22,7 @@ public function change(): void
         $table = $this->table('stores');
         $table->addColumn('parent_id', 'integer', ['null' => true, 'default' => null, 'signed'=> false])
             ->addColumn('name', 'string', ['limit' => 255, 'null' => false])
+            ->addTimestamps()
             ->create();
         
         $table->addForeignKey('parent_id', 'stores', 'id', ['delete' => 'SET_NULL', 'update' => 'NO_ACTION'])
diff --git a/backend/db/migrations/20260730124217_create_employees_table.php b/backend/db/migrations/20260730124217_create_employees_table.php
index 6169bec..8c62e96 100644
--- a/backend/db/migrations/20260730124217_create_employees_table.php
+++ b/backend/db/migrations/20260730124217_create_employees_table.php
@@ -22,6 +22,9 @@ public function change(): void
         $table = $this->table('employees');
         $table->addColumn('store_id', 'integer', ['null' => false, 'signed'=>false]) // integerに変更
             ->addColumn('name', 'string', ['limit' => 255, 'null' => false])
+            ->addColumn('password', 'string', ['limit' => 255, 'null' => false])
+            ->addColumn('role', 'enum', ['values' => ['admin', 'staff'], 'default' => 'staff', 'null' => false])
+            ->addTimestamps()
             ->addForeignKey('store_id', 'stores', 'id', ['delete' => 'CASCADE', 'update' => 'NO_ACTION'])
             ->create();
     }
diff --git a/backend/db/migrations/20260730124354_create_customers_table.php b/backend/db/migrations/20260730124354_create_customers_table.php
index 4745538..187cfa1 100644
--- a/backend/db/migrations/20260730124354_create_customers_table.php
+++ b/backend/db/migrations/20260730124354_create_customers_table.php
@@ -23,6 +23,7 @@ public function change(): void
         $table->addColumn('user_id', 'biginteger', ['null' => false])
             ->addColumn('paid', 'boolean', ['null' => false, 'default' => false])
             ->addColumn('disabled', 'boolean', ['null' => false, 'default' => false])
+            ->addTimestamps()
             ->addIndex(['user_id'], ['unique' => true])
             ->create();
     }
diff --git a/backend/db/migrations/20260730124432_create_histories_table.php b/backend/db/migrations/20260730124432_create_histories_table.php
index bcb5ed4..79d51d9 100644
--- a/backend/db/migrations/20260730124432_create_histories_table.php
+++ b/backend/db/migrations/20260730124432_create_histories_table.php
@@ -24,6 +24,7 @@ public function change(): void
             ->addColumn('store_id', 'integer', ['null' => false, 'signed'=>false])
             ->addColumn('score', 'integer', ['null' => false])
             ->addColumn('time', 'timestamp', ['null' => false, 'default' => 'CURRENT_TIMESTAMP'])
+            ->addTimestamps()
             ->addForeignKey('customer_user_id', 'customers', 'user_id', ['delete' => 'NO_ACTION', 'update' => 'NO_ACTION'])
             ->addForeignKey('store_id', 'stores', 'id', ['delete' => 'NO_ACTION', 'update' => 'NO_ACTION'])
             ->addIndex(['customer_user_id', 'time'])
diff --git a/backend/db/models/Customer.php b/backend/db/models/Customer.php
new file mode 100644
index 0000000..0353ab3
--- /dev/null
+++ b/backend/db/models/Customer.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Customer extends Model
+{
+    protected $table = 'customers';
+    public $timestamps = true;
+
+    protected $fillable = [
+        'user_id',
+        'paid',
+        'disabled',
+    ];
+
+    public static function booted()
+    {
+        static::creating(function (Customer $customer) {
+            if (empty($customer->user_id)) {
+                $customer->user_id = \Illuminate\Support\Facades\DB::raw('UUID_SHORT()');
+            }
+        });
+    }
+
+    public function pay(): void
+    {
+        $this->paid = true;
+        $this->save();
+    }
+
+    public function disable(): void
+    {
+        $this->disabled = true;
+        $this->save();
+    }
+
+    public function canPlayGame(): bool
+    {
+        return $this->paid && !$this->disabled;
+    }
+}
\ No newline at end of file
diff --git a/backend/db/models/Employee.php b/backend/db/models/Employee.php
new file mode 100644
index 0000000..66a42a5
--- /dev/null
+++ b/backend/db/models/Employee.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Employee extends Model
+{
+    protected $table = 'employees';
+    public $timestamps = true;
+    
+    protected $fillable = [
+        'store_id',
+        'name',
+        'role',
+    ];
+
+    protected $hidden = [
+        'password',
+    ];
+
+    public function setPassword($password) {
+        $this->password = password_hash($password, PASSWORD_DEFAULT);
+    }
+    public static function tryLogin($name, $password) :?Employee {
+        $employee = Employee::where('name', $name)->first();
+        if ($employee && password_verify($password, $employee->password)) {
+            return $employee;
+        }
+        return null;
+    }
+}
\ No newline at end of file
diff --git a/backend/db/models/History.php b/backend/db/models/History.php
new file mode 100644
index 0000000..d5a5ca3
--- /dev/null
+++ b/backend/db/models/History.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class History extends Model
+{
+    protected $table = 'histories';
+    public $timestamps = true;
+    
+    protected $fillable = [
+        'customer_user_id',
+        'store_id',
+        'score',
+        'time',
+    ];
+}
\ No newline at end of file
diff --git a/backend/db/models/Store.php b/backend/db/models/Store.php
new file mode 100644
index 0000000..b004d94
--- /dev/null
+++ b/backend/db/models/Store.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Store extends Model
+{
+    protected $table = 'stores';
+    public $timestamps = true;
+    
+    protected $fillable = [
+        'parent_id',
+        'name',
+    ];
+}
\ No newline at end of file