Implement Monlet MVP stack and UI updates

server/tests/test_constraints.py

@@ -0,0 +1,70 @@
+from datetime import UTC, datetime
+from uuid import uuid4
+
+import pytest
+from sqlalchemy import text
+from sqlalchemy.exc import IntegrityError
+
+from monlet_server.models import Incident
+
+
+@pytest.mark.asyncio
+async def test_event_id_conflict_do_nothing(engine):
+    eid = str(uuid4())
+    async with engine.begin() as conn:
+        await conn.execute(
+            text(
+                "INSERT INTO agents (agent_id, hostname, features, status, last_seen_at) "
+                "VALUES ('a','h',jsonb_build_object('push', true, 'metrics', false),'alive', now())"
+            )
+        )
+        await conn.execute(
+            text(
+                "INSERT INTO events (event_id, agent_id, check_id, observed_at, status, exit_code, duration_ms, incident_key)"
+                " VALUES (:e,'a','c', now(),'ok',0,1,'a:c')"
+            ),
+            {"e": eid},
+        )
+        r = await conn.execute(
+            text(
+                "INSERT INTO events (event_id, agent_id, check_id, observed_at, status, exit_code, duration_ms, incident_key)"
+                " VALUES (:e,'a','c', now(),'ok',0,1,'a:c') ON CONFLICT (event_id) DO NOTHING RETURNING event_id"
+            ),
+            {"e": eid},
+        )
+        assert r.scalar_one_or_none() is None
+
+
+@pytest.mark.asyncio
+async def test_partial_unique_open_incident(session):
+    key = "k1"
+    now = datetime.now(UTC)
+    eid = uuid4()
+    session.add(
+        Incident(
+            id=uuid4(),
+            incident_key=key,
+            agent_id="a",
+            check_id="c",
+            state="open",
+            severity="warning",
+            opened_at=now,
+            last_event_id=eid,
+        )
+    )
+    await session.commit()
+    session.add(
+        Incident(
+            id=uuid4(),
+            incident_key=key,
+            agent_id="a",
+            check_id="c",
+            state="open",
+            severity="critical",
+            opened_at=now,
+            last_event_id=eid,
+        )
+    )
+    with pytest.raises(IntegrityError):
+        await session.commit()
+    await session.rollback()