add group_code

assets/schema.sql

@@ -246,6 +246,16 @@ BEGIN
     END IF;
 END$$;
 
+DO $$
+BEGIN
+    IF NOT EXISTS (
+        SELECT 1 FROM information_schema.columns 
+        WHERE table_name = 'tariffs' AND column_name = 'group_code'
+    ) THEN
+        ALTER TABLE tariffs ADD COLUMN group_code TEXT NOT NULL DEFAULT 'default';
+    END IF;
+END$$;
+
 DO $$
 BEGIN
     IF EXISTS (