fix: exclude resolved problems from new-in-24h metrics (0.9.7)

Dashboard and created_within_hours list only show open/acknowledged problems
created in the last 24 hours; closed items appear under resolved only.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_problems.py

@@ -119,6 +119,38 @@ def test_problems_created_within_hours(client, db_session, jwt_headers):
     assert body["items"][0]["title"] == "recent"
 
 
+def test_problems_created_within_hours_excludes_resolved(client, db_session, jwt_headers):
+    now = datetime.now(timezone.utc)
+    h = Host(
+        hostname="p-host2",
+        os_family="linux",
+        product="ssh-monitor",
+        last_seen_at=now,
+    )
+    db_session.add(h)
+    db_session.flush()
+    db_session.add(
+        Problem(
+            host_id=h.id,
+            title="closed recently",
+            summary="s",
+            severity="warning",
+            status="resolved",
+            rule_id="rule:test",
+            fingerprint="fp-closed-recent",
+            event_count=1,
+            last_seen_at=now,
+            created_at=now - timedelta(hours=1),
+            updated_at=now - timedelta(minutes=30),
+        )
+    )
+    db_session.commit()
+
+    r = client.get("/api/v1/problems?created_within_hours=24", headers=jwt_headers)
+    assert r.status_code == 200
+    assert r.json()["total"] == 0
+
+
 def test_problems_resolved_within_hours(client, db_session, jwt_headers):
     now = datetime.now(timezone.utc)
     h = Host(