Building a Multi-Agent Voice Command Center: Load Bearing Empire's QHV Stack on Supabase, VAPI, and Vercel

We built a production voice command center handling 8 concurrent AI agents, 8 automation workflows, and real-time state management across 5 frontend interfaces—all on Supabase Edge Functions, VAPI's voice API, and Vercel deployments. This article breaks down the architecture: how we designed an 8-table Postgres schema to coordinate valet trash operations, real estate wholesaling, and credit repair workflows through a single webhook listener; how we structured VAPI agent callbacks to trigger state mutations without race conditions; and the specific infrastructure decisions that let us ship this from a self-hosted Asterisk PBX backbone. If you're running a service business (field ops, logistics, customer contact) and considering voice automation, this is the technical blueprint we used to move from proof-of-concept to production at Load Bearing Empire.