1. PublicChat::comprarPromoConSaldo — double saldo subtraction: $saldo->update()
already updates the model in memory, so $this->saldoUsuario = $saldo->valor - precio
was subtracting twice. Fixed by computing $nuevoSaldo before the update.
Also wrapped in DB::transaction (was missing unlike pagarConSaldo).
2. TelegramBotService::listServices — showed all services without filtering by the
user's rol_id, so users could see services with no plans for their role.
Now uses whereHas('tarifas', rol_id) like PublicChat and the web.
3. TelegramBotService::payWithSaldo — no DB::transaction; if saldo update failed
after historial was created, user got a free service. Now wrapped atomically.
4. TelegramBotService::buyPromoSaldo — same missing transaction + fecha_final was
hardcoded to 30 days instead of promo->dias. Both fixed.
5. TelegramBotService::showCredentials — N+1 queries loading cuentas lazily per
historial. Added cuentas to the eager-load list.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
