Первоначальный коммит

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

play-life-backend/migrations/000012_add_subtask_position.down.sql

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+-- Migration: Remove position field from tasks table
+-- Date: 2026-02-02
+--
+-- This migration removes the position field from tasks table.
+
+DROP INDEX IF EXISTS idx_tasks_parent_position;
+
+ALTER TABLE tasks 
+DROP COLUMN IF EXISTS position;