Place generated marker in output directory

scripts/generate_reports.py

@@ -15,6 +15,7 @@ DB_PATH = Path("database/ngxstat.db")
 OUTPUT_DIR = Path("output")
 TEMPLATE_DIR = Path("templates")
 REPORT_CONFIG = Path("reports.yml")
+GENERATED_MARKER = OUTPUT_DIR / "generated.txt"
 
 # Mapping of interval names to SQLite strftime formats.  These strings are
 # substituted into report queries whenever the special ``{bucket}`` token is
@@ -30,6 +31,18 @@ INTERVAL_FORMATS = {
 app = typer.Typer(help="Generate aggregated log reports")
 
 
+@app.callback()
+def _cli_callback(ctx: typer.Context) -> None:
+    """Register post-command hook to note generation time."""
+
+    def _write_marker() -> None:
+        OUTPUT_DIR.mkdir(parents=True, exist_ok=True)
+        timestamp = datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S")
+        GENERATED_MARKER.write_text(f"{timestamp}\n")
+
+    ctx.call_on_close(_write_marker)
+
+
 def _get_domains() -> List[str]:
     """Return a sorted list of unique domains from the logs table."""
     conn = sqlite3.connect(DB_PATH)