CREATE TABLE webhook_endpoints (
  id TEXT PRIMARY KEY, name TEXT NOT NULL, url TEXT NOT NULL,
  secret_cipher TEXT NOT NULL, enabled INTEGER NOT NULL DEFAULT 1,
  generation INTEGER NOT NULL DEFAULT 1,
  events_json TEXT NOT NULL, created_at TEXT NOT NULL, updated_at TEXT NOT NULL
);
CREATE TABLE webhook_deliveries (
  id TEXT PRIMARY KEY, endpoint_id TEXT NOT NULL REFERENCES webhook_endpoints(id) ON DELETE CASCADE,
  event_type TEXT NOT NULL, resource_id TEXT NOT NULL, payload_json TEXT NOT NULL,
  endpoint_generation INTEGER NOT NULL DEFAULT 1,
  status TEXT NOT NULL DEFAULT 'pending' CHECK(status IN ('pending','dead')),
  attempts INTEGER NOT NULL DEFAULT 0, next_attempt_at TEXT NOT NULL,
  created_at TEXT NOT NULL, last_error TEXT
);
CREATE INDEX idx_webhook_due ON webhook_deliveries(status,next_attempt_at);
CREATE TABLE webhook_transitions (
  endpoint_id TEXT NOT NULL REFERENCES webhook_endpoints(id) ON DELETE CASCADE,
  event_type TEXT NOT NULL, resource_id TEXT NOT NULL, state TEXT NOT NULL,
  last_emitted_at TEXT, PRIMARY KEY(endpoint_id,event_type,resource_id)
);
CREATE TABLE webhook_metrics (id INTEGER PRIMARY KEY CHECK(id=1), dropped INTEGER NOT NULL DEFAULT 0);
INSERT INTO webhook_metrics(id) VALUES (1);