chore: added a new field to customize the schedule period

database/schemas/data.sql

@@ -1,5 +1,6 @@
 CREATE TABLE IF NOT EXISTS users (
-    user_id INTEGER UNIQUE NOT NULL,
+    user_id INTEGER PRIMARY KEY,
     chart BOOLEAN DEFAULT 1,
+    chart_period TEXT DEFAULT 'month',
     lang TEXT DEFAULT 'en'
 );