feat(db): webhook tables migration (DEV-44)

internal/database/migrations/000002_webhooks.down.sql

@@ -0,0 +1,2 @@
+DROP TABLE IF EXISTS webhook_deliveries;
+DROP TABLE IF EXISTS webhook_registrations;

internal/database/migrations/000002_webhooks.up.sql

@@ -0,0 +1,24 @@
+CREATE TABLE IF NOT EXISTS webhook_registrations (
+    id          UUID        PRIMARY KEY DEFAULT uuid_generate_v4(),
+    url         TEXT        NOT NULL,
+    secret      TEXT        NOT NULL,        -- encrypted at rest (ENCRYPTION_KEY)
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE IF NOT EXISTS webhook_deliveries (
+    id              UUID        PRIMARY KEY DEFAULT uuid_generate_v4(),
+    registration_id UUID        NOT NULL REFERENCES webhook_registrations (id) ON DELETE CASCADE,
+    event           TEXT        NOT NULL,    -- 'job.done' | 'job.failed'
+    asset_id        UUID        NOT NULL,
+    job_id          BIGINT      NOT NULL,
+    payload         JSONB       NOT NULL,
+    status          TEXT        NOT NULL DEFAULT 'pending',  -- pending | delivered | failed
+    attempts        INT         NOT NULL DEFAULT 0,
+    next_attempt_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    delivered_at    TIMESTAMPTZ,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS webhook_deliveries_pending_idx
+    ON webhook_deliveries (next_attempt_at)
+    WHERE status = 'pending';