-- Add user preferences columns
ALTER TABLE users ADD COLUMN week_start_day SMALLINT NOT NULL DEFAULT 0;
ALTER TABLE users ADD COLUMN date_format TEXT NOT NULL DEFAULT 'MM/dd/yyyy';
ALTER TABLE users ADD COLUMN time_format TEXT NOT NULL DEFAULT '12h';
ALTER TABLE users ADD COLUMN default_event_duration_minutes INTEGER NOT NULL DEFAULT 60;
ALTER TABLE users ADD COLUMN default_reminder_minutes INTEGER NOT NULL DEFAULT 10;
ALTER TABLE users ADD COLUMN show_weekends BOOLEAN NOT NULL DEFAULT true;
ALTER TABLE users ADD COLUMN working_hours_start TEXT NOT NULL DEFAULT '09:00';
ALTER TABLE users ADD COLUMN working_hours_end TEXT NOT NULL DEFAULT '17:00';
ALTER TABLE users ADD COLUMN notifications_email BOOLEAN NOT NULL DEFAULT true;