3.28.2: Оптимизация загрузки деталей задачи

play-life-backend/migrations/028_optimize_task_queries.sql

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+-- Migration: Optimize task queries with composite index
+-- Date: 2026-01-24
+--
+-- This migration adds a composite index to optimize the task detail query:
+-- WHERE id = $1 AND user_id = $2 AND deleted = FALSE
+--
+-- The index uses a partial index with WHERE deleted = FALSE to reduce index size
+-- and improve query performance for active (non-deleted) tasks.
+
+CREATE INDEX IF NOT EXISTS idx_tasks_id_user_deleted 
+ON tasks(id, user_id, deleted) 
+WHERE deleted = FALSE;
+
+COMMENT ON INDEX idx_tasks_id_user_deleted IS 'Composite index for optimizing task detail queries with id, user_id, and deleted filter. Partial index for non-deleted tasks only.';

play-life-backend/migrations/029_add_covering_indexes.sql

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+-- Migration: Add covering indexes for task detail queries
+-- Date: 2026-01-25
+--
+-- This migration adds covering indexes to optimize queries by including
+-- all needed columns in the index, avoiding table lookups.
+--
+-- Covering indexes allow PostgreSQL to perform index-only scans,
+-- getting all data directly from the index without accessing the table.
+
+-- Covering index for subtasks query
+-- Includes all columns needed for subtasks selection to avoid table lookups
+CREATE INDEX IF NOT EXISTS idx_tasks_parent_deleted_covering 
+ON tasks(parent_task_id, deleted, id) 
+INCLUDE (name, completed, last_completed_at, reward_message, progression_base)
+WHERE deleted = FALSE;
+
+-- Covering index for wishlist name lookup
+-- Includes name and deleted flag for quick lookup without table access
+CREATE INDEX IF NOT EXISTS idx_wishlist_items_id_deleted_covering 
+ON wishlist_items(id, deleted) 
+INCLUDE (name)
+WHERE deleted = FALSE;
+
+COMMENT ON INDEX idx_tasks_parent_deleted_covering IS 'Covering index for subtasks query - includes all selected columns to avoid table lookups. Enables index-only scans for better performance.';
+COMMENT ON INDEX idx_wishlist_items_id_deleted_covering IS 'Covering index for wishlist name lookup - includes name to avoid table lookup. Enables index-only scans for better performance.';