Wire Celery Beat periodic sync with ingestion run tracking

config/celery.py

@@ -1,8 +1,41 @@
 import os
 from celery import Celery
+from celery.schedules import crontab
+from django.conf import settings
 
 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings.development")
 
 app = Celery("hoopscout")
 app.config_from_object("django.conf:settings", namespace="CELERY")
 app.autodiscover_tasks()
+
+
+def _parse_cron_expression(expression: str) -> dict[str, str]:
+    parts = expression.split()
+    if len(parts) != 5:
+        raise ValueError(
+            "INGESTION_SCHEDULE_CRON must have 5 fields: minute hour day_of_month month_of_year day_of_week."
+        )
+    return {
+        "minute": parts[0],
+        "hour": parts[1],
+        "day_of_month": parts[2],
+        "month_of_year": parts[3],
+        "day_of_week": parts[4],
+    }
+
+
+def build_periodic_schedule() -> dict:
+    if not settings.INGESTION_SCHEDULE_ENABLED:
+        return {}
+
+    schedule_kwargs = _parse_cron_expression(settings.INGESTION_SCHEDULE_CRON)
+    return {
+        "ingestion.scheduled_provider_sync": {
+            "task": "apps.ingestion.tasks.scheduled_provider_sync",
+            "schedule": crontab(**schedule_kwargs),
+        }
+    }
+
+
+app.conf.beat_schedule = build_periodic_schedule()