RoomLedger — Booking & Billing for Kos/Kost Domain: room bookings (kos/kost), deposit + monthly rent billing, admin verification, occupancy & finance basics.

Features:

Tenants, Buildings, Rooms (trigger)
Room inquiry with filters (building, status, price) and availability by date range
Booking lifecycle: DRAFT → ACTIVE → ENDED/CANCELLED
Deposit first, then rent bills (monthly), with daily proration for partial months
Discount tiers for multi-month stays (configurable)
Payments (DEPOSIT/RENT) with statuses: PENDING → PAID → VERIFIED / CANCELLED
Self-service payment confirm (user) and verify (admin)
Renewal flow (continue/stop next period)
Background job: auto-cancel DRAFT bookings if deposit not paid within TTL
Dockerfile + docker-compose to run app + Postgre