API-07: zentrale-webhook-registry-zustellung (postgres-jobqueue, hmac-signatur, backoff)

migrations/0003_webhooks.down.sql

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+DROP TABLE webhook_deliveries;
+DROP TABLE webhook_subscriptions;

migrations/0003_webhooks.up.sql

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+-- Zentrale Webhook-Registry & Zustellung (API-07, siehe
+-- core-kanban/tickets/API-07.md) — Postgres-basierte Jobqueue, kein
+-- Redis/AMQP (Ticket-Vorgabe).
+CREATE TABLE webhook_subscriptions (
+    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    event_type  TEXT NOT NULL,
+    target_url  TEXT NOT NULL,
+    secret      TEXT NOT NULL,
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX webhook_subscriptions_event_type_idx ON webhook_subscriptions (event_type);
+
+CREATE TABLE webhook_deliveries (
+    id               UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    subscription_id  UUID NOT NULL REFERENCES webhook_subscriptions(id),
+    event_type       TEXT NOT NULL,
+    payload          JSONB NOT NULL,
+    status           TEXT NOT NULL DEFAULT 'pending', -- pending|delivered|failed
+    attempt          INT NOT NULL DEFAULT 0,
+    next_attempt_at  TIMESTAMPTZ NOT NULL DEFAULT now(),
+    last_error       TEXT,
+    created_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
+    delivered_at     TIMESTAMPTZ
+);
+
+CREATE INDEX webhook_deliveries_due_idx ON webhook_deliveries (status, next_attempt_at);