Первоначальный коммит

Co-authored-by: Cursor <cursoragent@cursor.com>

play-life-backend/migrations/000009_add_is_admin_to_users.down.sql

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+-- Migration: Remove is_admin field from users table
+-- Date: 2026-02-02
+--
+-- This migration reverts the addition of is_admin field.
+
+DROP INDEX IF EXISTS idx_users_is_admin;
+
+ALTER TABLE users 
+DROP COLUMN IF EXISTS is_admin;