Turns the consumer's resource into the outbound delivery ledger — the
durable, effect-once record of "this event owes this endpoint a
delivery" (the outbound twin of AshHooks.InboundDelivery).
use Ash.Resource,
data_layer: AshSqlite.DataLayer,
extensions: [AshHooks.OutboundDelivery]The extension injects the delivery fields (event_uuid — the webhook
id, immutable across retries; the exact payload bytes to sign;
endpoint_id/subscription_id; the lifecycle status; attempts;
the machine-written response_status/response_snippet/
next_attempt_at; bounded last_error), the unique_delivery
identity on [:endpoint_id, :event_uuid] — the SAME pair the Oban job
uniqueness keys use, so row identity and job identity coincide — and
the machine primitives :dispatch (no-touch unique upsert, the
:ingest mirror) and :mark_enqueue_failed.
Storage-level uniqueness on unique_delivery is the idempotency
primitive: the consumer's migration must carry the matching unique
index (ADR-0003's argument, applied outbound).
response_status, response_snippet (the no-body summary by default —
status + allowlisted content-type token; the [captured]-marked,
floor-redacted body only on the runtime's per-call opt-in, ADR-0005's
snippet amendment), and next_attempt_at are writable?: false — no
consumer create/update INPUT accepts them; they reach the ledger only
as arguments of the runtime's machine primitives (:mark_succeeded,
:mark_send_failed), gated by WHERE-status fences. NO request or
response headers are stored on this resource at all: the
stored-header allowlist floor holds by not persisting headers beyond
the bounded snippet (ADR-0005).