Fix webhook starvation and isolate scheduled job failures for v0.1.2 [skip ci]

tests/test_extensions.py

@@ -373,3 +373,30 @@ def test_ai_layout_sends_metadata_only_and_validates_response(
     assert b"test-ai-secret" not in calls[0]["body"]
     assert image.getvalue() not in calls[0]["body"]
     assert calls[0]["headers"]["Authorization"] == "Bearer test-ai-secret"
+
+
+def test_webhook_matching_event_after_unrelated_backlog(client, service, monkeypatch):
+    import json
+
+    service.settings.image_url_hosts.append("example.com")
+    response = client.post(
+        "/api/v1/webhooks",
+        json={
+            "callback_url": "https://example.com/events",
+            "event_types": ["operation.failed"],
+        },
+    )
+    assert response.status_code == 201
+    for _ in range(500):
+        service.db.event("display.changed", {})
+    service.db.event("operation.failed", {"operation_id": "expected"})
+    sent = []
+    monkeypatch.setattr(
+        service.assets, "fetch_url", lambda url, **kwargs: sent.append(kwargs) or b""
+    )
+    service.webhooks.tick()
+    service.webhooks.last = 0
+    service.webhooks.tick()
+    assert len(sent) == 1
+    assert json.loads(sent[0]["body"])["data"] == {"operation_id": "expected"}
+    assert len(service.db.all("SELECT * FROM webhook_deliveries")) == 1