4.19.0: Добавлены позиции подзадач

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

@@ -0,0 +1,9 @@
+-- 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;

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

@@ -0,0 +1,49 @@
+-- Migration: Add position field to tasks table for subtasks ordering
+-- Date: 2026-02-02
+--
+-- This migration adds position field to tasks table to allow
+-- custom ordering of subtasks. The field is NULL for regular tasks
+-- and contains position number for subtasks (tasks with parent_task_id).
+
+-- Добавляем поле position
+ALTER TABLE tasks 
+ADD COLUMN position INTEGER;
+
+-- Заполняем позиции для всех существующих подзадач
+-- Позиции присваиваются по порядку id в рамках каждой родительской задачи
+DO $$
+DECLARE
+    parent_record RECORD;
+    subtask_record RECORD;
+    pos INTEGER;
+BEGIN
+    -- Для каждой родительской задачи
+    FOR parent_record IN 
+        SELECT DISTINCT parent_task_id 
+        FROM tasks 
+        WHERE parent_task_id IS NOT NULL
+        ORDER BY parent_task_id
+    LOOP
+        pos := 0;
+        -- Обновляем подзадачи этой родительской задачи
+        FOR subtask_record IN 
+            SELECT id 
+            FROM tasks 
+            WHERE parent_task_id = parent_record.parent_task_id 
+            AND deleted = FALSE
+            ORDER BY id
+        LOOP
+            UPDATE tasks 
+            SET position = pos 
+            WHERE id = subtask_record.id;
+            
+            pos := pos + 1;
+        END LOOP;
+    END LOOP;
+END $$;
+
+-- Создаем индекс для быстрой сортировки подзадач
+CREATE INDEX idx_tasks_parent_position ON tasks(parent_task_id, position) 
+WHERE parent_task_id IS NOT NULL AND deleted = FALSE;
+
+COMMENT ON COLUMN tasks.position IS 'Position of subtask within parent task. NULL for regular tasks.';