Описание изменений

backend/db/migrations/007_user_preferences.sql

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+CREATE TABLE IF NOT EXISTS user_preferences (
+  id SERIAL PRIMARY KEY,
+  user_id INTEGER NOT NULL REFERENCES users(id),
+  preference_key VARCHAR(50) NOT NULL,
+  preference_value TEXT,
+  metadata JSONB DEFAULT '{}',
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  UNIQUE(user_id, preference_key)
+);
+
+-- Добавляем колонку metadata, если её нет
+DO $$ 
+BEGIN 
+  IF NOT EXISTS (
+    SELECT 1 FROM information_schema.columns 
+    WHERE table_name = 'user_preferences' AND column_name = 'metadata'
+  ) THEN
+    ALTER TABLE user_preferences ADD COLUMN metadata JSONB DEFAULT '{}';
+  END IF;
+END $$;
+
+CREATE INDEX IF NOT EXISTS idx_user_preferences_user_id ON user_preferences(user_id);
+
+-- Базовые настройки
+DO $$ 
+BEGIN 
+  INSERT INTO user_preferences (user_id, preference_key, preference_value, metadata)
+  SELECT id, 'language', 'ru', '{"available": ["ru", "en"]}'::jsonb
+  FROM users u
+  WHERE NOT EXISTS (
+    SELECT 1 FROM user_preferences 
+    WHERE preference_key = 'language' AND user_id = u.id
+  );
+END $$;
+
+DO $$ 
+BEGIN 
+  INSERT INTO user_preferences (user_id, preference_key, preference_value, metadata)
+  SELECT id, 'notifications', 'true', '{"channels": ["email", "telegram"]}'::jsonb
+  FROM users u
+  WHERE NOT EXISTS (
+    SELECT 1 FROM user_preferences 
+    WHERE preference_key = 'notifications' AND user_id = u.id
+  );
+END $$;