Replace Prisma raw queries with pg.Pool for all tenant-scoped services:
cfdi, dashboard, impuestos, alertas, calendario, reportes, export, and SAT.
Controllers now pass req.tenantPool instead of req.tenantSchema.
Fixes SQL injection in calendario.service.ts (parameterized interval).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>