diff --git a/backend/db/blueprint.sql b/backend/db/blueprint.sql
new file mode 100644
index 0000000..d74b773
--- /dev/null
+++ b/backend/db/blueprint.sql
@@ -0,0 +1,31 @@
+CREATE TABLE IF NOT EXISTS `stores` (
+    `id` INT AUTO_INCREMENT PRIMARY KEY,
+    `parent_id` INT DEFAULT NULL,
+    `name` VARCHAR(255) NOT NULL,
+    FOREIGN KEY (`parent_id`) REFERENCES `stores`(`id`) ON DELETE SET NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+CREATE TABLE IF NOT EXISTS `employees` (
+    `id` INT AUTO_INCREMENT PRIMARY KEY,
+    `store_id` INT NOT NULL,
+    `name` VARCHAR(255) NOT NULL,
+    FOREIGN KEY (`store_id`) REFERENCES `stores`(`id`) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+CREATE TABLE IF NOT EXISTS `customers` (
+    `id` INT AUTO_INCREMENT PRIMARY KEY,
+    `user_id` BIGINT NOT NULL,
+    `paid` BOOLEAN NOT NULL DEFAULT FALSE,
+    `disabled` BOOLEAN NOT NULL DEFAULT FALSE, -- ゲーム終了時 true
+    UNIQUE KEY `uk_user_id` (`user_id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+CREATE TABLE IF NOT EXISTS `histories` (
+    `id` INT AUTO_INCREMENT PRIMARY KEY,
+    `customer_user_id` BIGINT NOT NULL,
+    `store_id` INT NOT NULL,
+    `score` INT NOT NULL,
+    `time` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (`customer_user_id`) REFERENCES `customers`(`user_id`) ON DELETE NO ACTION,
+    FOREIGN KEY (`store_id`) REFERENCES `stores`(`id`) ON DELETE NO ACTION
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
\ No newline at end of file
diff --git a/backend/db/migrations/20260730124014_create_stores_table.php b/backend/db/migrations/20260730124014_create_stores_table.php
new file mode 100644
index 0000000..8c7247f
--- /dev/null
+++ b/backend/db/migrations/20260730124014_create_stores_table.php
@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+use Phinx\Migration\AbstractMigration;
+
+final class CreateStoresTable extends AbstractMigration
+{
+    /**
+     * Change Method.
+     *
+     * Write your reversible migrations using this method.
+     *
+     * More information on writing migrations is available here:
+     * https://book.cakephp.org/phinx/0/en/migrations.html#the-change-method
+     *
+     * Remember to call "create()" or "update()" and NOT "save()" when working
+     * with the Table class.
+     */
+    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])
+            ->create();
+        
+        $table->addForeignKey('parent_id', 'stores', 'id', ['delete' => 'SET_NULL', 'update' => 'NO_ACTION'])
+            ->update();
+    }
+}
diff --git a/backend/db/migrations/20260730124217_create_employees_table.php b/backend/db/migrations/20260730124217_create_employees_table.php
new file mode 100644
index 0000000..6169bec
--- /dev/null
+++ b/backend/db/migrations/20260730124217_create_employees_table.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+use Phinx\Migration\AbstractMigration;
+
+final class CreateEmployeesTable extends AbstractMigration
+{
+    /**
+     * Change Method.
+     *
+     * Write your reversible migrations using this method.
+     *
+     * More information on writing migrations is available here:
+     * https://book.cakephp.org/phinx/0/en/migrations.html#the-change-method
+     *
+     * Remember to call "create()" or "update()" and NOT "save()" when working
+     * with the Table class.
+     */
+    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])
+            ->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
new file mode 100644
index 0000000..4745538
--- /dev/null
+++ b/backend/db/migrations/20260730124354_create_customers_table.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+use Phinx\Migration\AbstractMigration;
+
+final class CreateCustomersTable extends AbstractMigration
+{
+    /**
+     * Change Method.
+     *
+     * Write your reversible migrations using this method.
+     *
+     * More information on writing migrations is available here:
+     * https://book.cakephp.org/phinx/0/en/migrations.html#the-change-method
+     *
+     * Remember to call "create()" or "update()" and NOT "save()" when working
+     * with the Table class.
+     */
+    public function change(): void
+    {
+        $table = $this->table('customers');
+        $table->addColumn('user_id', 'biginteger', ['null' => false])
+            ->addColumn('paid', 'boolean', ['null' => false, 'default' => false])
+            ->addColumn('disabled', 'boolean', ['null' => false, 'default' => false])
+            ->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
new file mode 100644
index 0000000..bcb5ed4
--- /dev/null
+++ b/backend/db/migrations/20260730124432_create_histories_table.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+use Phinx\Migration\AbstractMigration;
+
+final class CreateHistoriesTable extends AbstractMigration
+{
+    /**
+     * Change Method.
+     *
+     * Write your reversible migrations using this method.
+     *
+     * More information on writing migrations is available here:
+     * https://book.cakephp.org/phinx/0/en/migrations.html#the-change-method
+     *
+     * Remember to call "create()" or "update()" and NOT "save()" when working
+     * with the Table class.
+     */
+    public function change(): void
+    {
+        $table = $this->table('histories');
+        $table->addColumn('customer_user_id', 'biginteger', ['null' => false])
+            ->addColumn('store_id', 'integer', ['null' => false, 'signed'=>false])
+            ->addColumn('score', 'integer', ['null' => false])
+            ->addColumn('time', 'timestamp', ['null' => false, 'default' => 'CURRENT_TIMESTAMP'])
+            ->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'])
+            ->addIndex(['store_id', 'time'])
+            ->create();
+    }
+}