Add report generation timing stats

tests/test_reports.py

@@ -148,20 +148,19 @@ def test_generate_interval_domain_filter(tmp_path, sample_reports, monkeypatch):
     gr._generate_interval("hourly", "example.com")
 
     hits = json.loads(
-        (tmp_path / "output" / "domains" / "example.com" / "hourly" / "hits.json").read_text()
+        (
+            tmp_path / "output" / "domains" / "example.com" / "hourly" / "hits.json"
+        ).read_text()
     )
     assert hits[0]["value"] == 2
     reports = json.loads(
-        (tmp_path / "output" / "domains" / "example.com" / "hourly" / "reports.json").read_text()
+        (
+            tmp_path / "output" / "domains" / "example.com" / "hourly" / "reports.json"
+        ).read_text()
     )
     assert {r["name"] for r in reports} == {"hits", "error_rate"}
     assert not (
-        tmp_path
-        / "output"
-        / "domains"
-        / "example.com"
-        / "hourly"
-        / "skip_report.json"
+        tmp_path / "output" / "domains" / "example.com" / "hourly" / "skip_report.json"
     ).exists()
 
 
@@ -245,9 +244,12 @@ def test_global_stats_file(tmp_path, sample_reports, monkeypatch):
         "start_date",
         "end_date",
         "unique_domains",
+        "generated_at",
+        "generation_seconds",
     }
     assert stats["total_logs"] == 2
     assert stats["start_date"] == "2024-01-01 10:00:00"
     assert stats["end_date"] == "2024-01-01 10:05:00"
     assert stats["unique_domains"] == 1
-
+    assert isinstance(stats["generated_at"], str)
+    assert stats["generation_seconds"] >= 0