Rental property management for a landlord

Build a management tool for a small landlord (1-20 units).

Core features:
1. Units, tenants, leases with start/end and rent
2. Rent invoicing + Stripe or bank pay
3. Maintenance tickets from tenants, assign to vendors
4. Documents (lease PDF, ID) per tenant
5. Dashboard: occupancy, arrears, upcoming lease ends

Data: units, tenants, leases, invoices, tickets, documents.
Must-haves: tenant portal (login), RLS strict per landlord.