Add conversion from old schedules format to the new one

Improve conversion with regex group

app/service/app_svc.py

@@ -4,6 +4,7 @@
 import hashlib
 import json
 import os
+import re
 import time
 from collections import namedtuple
 from datetime import datetime, timezone
@@ -84,6 +85,12 @@ async def run_scheduler(self):
             interval = 60
             for s in await self.get_service('data_svc').locate('schedules'):
                 now = datetime.now(timezone.utc)
+                match = re.match(r'^(\d{2}):(\d{2}):\d{2}\.\d{6}$', s.schedule)
+                if match:
+                    hour, minute = match.groups()
+                    s.schedule = f"{minute} {hour} * * *"
+                    self.log.info(f"Converted time schedule {s.id} to cron format: {s.schedule}")
+
                 if not croniter.croniter.is_valid(s.schedule):
                     self.log.warning(f"The schedule {s.id} with the format `{s.schedule}` is incompatible with cron!")
                     continue