Add monitor mode switch and monitor frequency

main.py

@@ -3,6 +3,7 @@ import json
 from dataclasses import dataclass
 from datetime import datetime
 from pathlib import Path
+from time import sleep
 from typing import Any
 
 import requests
@@ -16,7 +17,8 @@ NOTIFICATION_CHANNEL = "nightjet-price-notifier"
 
 START_STATION = "8096003"  # BerlinHBF
 END_STATION = "8796001"  # Paris Est
-TRAVEL_DATE = "2025-10-14"
+
+MONITOR_FREQUENCY = 3600
 
 
 def dprint(txt) -> None:
@@ -286,6 +288,14 @@ def main(
     notification_channel: str = typer.Option(
         NOTIFICATION_CHANNEL, help="ntfy channel to inform user on."
     ),
+    monitor_mode: bool = typer.Option(
+        True,
+        help="Run queries repeatedly over time. If False only runs a single query (oneshot mode).",
+    ),
+    monitor_frequency: int = typer.Option(
+        MONITOR_FREQUENCY,
+        help="How often to run price queries if in monitoring mode, in seconds.",
+    ),
     base_output_directory: Path = typer.Option(
         Path(BASE_DIR), help="Directory in which to output all result files."
     ),
@@ -309,6 +319,8 @@ def main(
     except ValueError:
         typer.echo(f"Invalid date format: {travel_date}. Use YYYY-MM-DD", err=True)
         raise typer.Exit(1)
+
+    while True:
         prices = query(
             start_station=start_station, end_station=end_station, travel_date=date_obj
         )
@@ -338,6 +350,14 @@ def main(
                 notification_channel,
             )
 
+        # oneshot exit
+        if not monitor_mode:
+            break
+        dprint(
+            f"Query complete. Monitoring mode active, sleeping for {monitor_frequency} seconds..."
+        )
+        sleep(monitor_frequency)
+
 
 if __name__ == "__main__":
     app()