The 2026-10-08 ask: open an account without four screens — cliente, propiedad, servicios and the saldo inicial, taken as the first payment. POST /customers/onboard writes it all in one Prisma transaction; a bad service or a taken folder number leaves nothing behind (rolled back on dev). A cash opening balance goes through the EFE receipt book inside that same transaction, so it gets its folio and its C<folio> credit; a check posts a CHECK DEPOSIT against the number given. /clientes/alta pre-fills the next free folder number and links the receipt for printing. The old customer-only form stays as "Solo cliente". Built without the screen sketch from the meeting (it never arrived); the fields are the legacy ones. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>