pgflow is a PostgreSQL/Supabase-native workflow orchestration engine for defining and executing typed DAGs as background jobs. The system is split into six coordinated packages: a PL/pgSQL core (pkgs/core) that implements the complete workflow state machine in the database — flows, steps, runs, step states, tasks, retries with exponential backoff, map/reduce fan-out, conditional step execution, skip-cascade propagation, and realtime event broadcasting — plus a type-safe TypeScript DSL (pkgs/dsl) for declaring flows with compile-time-enforced inputs/outputs, a Deno/edge worker runtime (pkgs/edge-worker) that consumes PGMQ messages and executes step handlers via platform adapters (Supabase vs. plain process), a realtime-subscription client library (pkgs/client), and a CLI (pkgs/cli) for scaffolding new Supabase projects. Execution relies on pgmq for task queues, pg_cron for stalled-task recovery and worker health, pg_net for HTTP worker invocation, supabase_vault for credentials, and Supabase Realtime for atomic state-transition broadcasts.