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Build me a self-hosted automation runner for the handful of integrations I actually use.

STACK
- Node with Fastify, SQLite via better-sqlite3, a cron-driven worker
- No frontend framework

WORKFLOWS
- JSON files on disk: a trigger — incoming webhook, schedule, or polling an HTTP endpoint — and an ordered list of steps
- Steps as small modules with one interface: HTTP request, template a string, filter, branch, delay
- Each receives the accumulated context and returns the next one

RUNS
- Recorded append-only with the input, each step's output and any error
- A failure three weeks ago must still be diagnosable

FAILURE
- Exponential-backoff retries per step, a dead-letter state
- A page listing failed runs with a one-click replay from the stored input

SECRETS
- Read from the environment, never written into a run record — redacted on the way in

TRIGGERS
- An incoming webhook URL per workflow with an HMAC-signed token and a rate limit
- Polling keeps a cursor, and the cursor is only advanced after the run succeeds

THE WORKED EXAMPLE
- One workflow polling an RSS feed and posting new items somewhere
- The polling cursor is the part people get wrong, so it is the example

Include a README on writing a step module, the redaction rules and the replay semantics.