feature(backend): setup cron to get stats daily

backend/cron_tasks.py

@@ -21,6 +21,7 @@ from base_app.management.commands.clean_user_accounts import (
     ClearUserAccounts,
     ClearSessions,
 )  # noqa: E402
+from stats_app.compute_stats import update_all_stats  # noqa: E402
 
 logger = logging.getLogger("django")
 
@@ -50,3 +51,9 @@ def update_extra_denormalization(num):
 def clear_and_clean_sessions(num):
     ClearUserAccounts.run()
     ClearSessions.run()
+
+
+@cron(30, 0, -1, -1, -1, target="spooler")  # everyday at 30 past midnight
+@harakiri(60 * 5)  # shouldn't take more than 5 minutes to run
+def update_daily_stats():
+    update_all_stats()