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

play-life-backend/migrations/000014_add_group_name.up.sql

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+-- Migration: Add group_name field to wishlist_items and tasks tables
+-- Date: 2026-02-XX
+--
+-- This migration:
+-- 1. Adds group_name field to wishlist_items (replacing project_id)
+-- 2. Migrates existing data from project_id to group_name
+-- 3. Removes project_id column from wishlist_items
+-- 4. Adds group_name field to tasks
+-- 5. Creates materialized view for group suggestions
+
+-- Step 1: Add group_name to wishlist_items
+ALTER TABLE wishlist_items 
+ADD COLUMN group_name VARCHAR(255);
+
+-- Step 2: Migrate existing data from project_id to group_name
+UPDATE wishlist_items wi
+SET group_name = p.name
+FROM projects p
+WHERE wi.project_id = p.id AND wi.project_id IS NOT NULL;
+
+-- Step 3: Remove project_id column and its index
+DROP INDEX IF EXISTS idx_wishlist_items_project_id;
+ALTER TABLE wishlist_items 
+DROP COLUMN project_id;
+
+-- Step 4: Add group_name to tasks
+ALTER TABLE tasks 
+ADD COLUMN group_name VARCHAR(255);
+
+-- Step 5: Create indexes on group_name
+CREATE INDEX idx_wishlist_items_group_name ON wishlist_items(group_name) WHERE group_name IS NOT NULL;
+CREATE INDEX idx_tasks_group_name ON tasks(group_name) WHERE group_name IS NOT NULL;
+
+-- Step 6: Create materialized view for group suggestions
+CREATE MATERIALIZED VIEW user_group_suggestions_mv AS
+SELECT DISTINCT user_id, group_name FROM (
+    -- Желания пользователя (собственные)
+    SELECT wi.user_id, wi.group_name FROM wishlist_items wi
+    WHERE wi.deleted = FALSE AND wi.group_name IS NOT NULL AND wi.group_name != ''
+    UNION
+    -- Желания с досок, на которых пользователь участник
+    SELECT wbm.user_id, wi.group_name FROM wishlist_items wi
+    JOIN wishlist_board_members wbm ON wi.board_id = wbm.board_id
+    WHERE wi.deleted = FALSE AND wi.group_name IS NOT NULL AND wi.group_name != ''
+    UNION
+    -- Задачи пользователя
+    SELECT t.user_id, t.group_name FROM tasks t
+    WHERE t.deleted = FALSE AND t.group_name IS NOT NULL AND t.group_name != ''
+    UNION
+    -- Имена проектов пользователя
+    SELECT p.user_id, p.name FROM projects p
+    WHERE p.deleted = FALSE
+) sub;
+
+-- Step 7: Create unique index for CONCURRENT refresh
+CREATE UNIQUE INDEX idx_user_group_suggestions_mv_user_group ON user_group_suggestions_mv(user_id, group_name);
+
+COMMENT ON COLUMN wishlist_items.group_name IS 'Group name for wishlist item (free text, replaces project_id)';
+COMMENT ON COLUMN tasks.group_name IS 'Group name for task (free text)';
+COMMENT ON MATERIALIZED VIEW user_group_suggestions_mv IS 'Materialized view for group name suggestions per user';