Tamsaek Profit v1.0
- Menu '탐색 광고수익', page title '광고수익 대시보드'
- Entry list by year/month (default current month), pagination removed
- Mobile card layout with weekday label
- Hardened save (transaction + row lock, date/number validation, duplicate-date protection)
- Auto exchange rate (ECB -> KITA KRW standard rate)