fix: validate complete-day monitoring coverage

tests/test_issue_72_edge_cases.py

@@ -211,6 +211,8 @@ class TestStalenessFact:
         _insert_baseline(conn)
 
         base = datetime(2026, 9, 15, 12, 0, 0, tzinfo=timezone.utc)
+        ensure_period_open(conn, base)
+        conn.commit()
         for i in range(14):
             day = (base + timedelta(days=i)).strftime("%Y-%m-%d")
             _insert_day(conn, day, bw=10*1024*1024*1024)
@@ -234,6 +236,8 @@ class TestStalenessFact:
         _insert_baseline(conn)
 
         base = datetime(2026, 9, 18, 12, 0, 0, tzinfo=timezone.utc)
+        ensure_period_open(conn, base)
+        conn.commit()
         for i in range(14):
             day = (base + timedelta(days=i)).strftime("%Y-%m-%d")
             _insert_day(conn, day, bw=10*1024*1024*1024)