test(syslog): a preset's 15-minute window doesn't reach the 40-minute-old nfsd line (#6001)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/integration/test_syslog.py

@@ -332,6 +332,7 @@ def test_patterns_page_adds_edits_and_removes_and_a_rename_moves_counts(app):
         assert rows["nfs"].phrases[0] == "nfsd:"
 
         await patterns.record_counts(app, now)
+        assert await _latest(app, "lines_matching_nfs") == {src_name: 0.0}
         page = await (await admin.get("/plugins/syslog/patterns")).get_data(as_text=True)
         assert "Quota full" in page and "NFS server trouble" in page
         assert "metric_name=lines_matching_quota_full" in page
@@ -353,7 +354,9 @@ def test_patterns_page_adds_edits_and_removes_and_a_rename_moves_counts(app):
         renamed = await admin.post(f"/plugins/syslog/sources/{src_id}/edit", headers=csrf,
                                    form={"name": "Big NAS", "host_id": ""})
         assert renamed.status_code == 302
-        assert await _latest(app, "lines_matching_nfs") == {"Big NAS": 1.0}
+        # (0: a preset's window is 15 minutes, and the nfsd line is 40 old;
+        # no count has run since, so the row under the new name was moved.)
+        assert await _latest(app, "lines_matching_nfs") == {"Big NAS": 0.0}
 
         removed = await admin.post(f"/plugins/syslog/patterns/{rows['nfs'].id}/delete", headers=csrf)
         assert removed.status_code == 302