Added activities module

backend/migrations/000007_create_activity_logs.down.sql

@@ -0,0 +1,10 @@
+DO
+$$
+BEGIN
+    IF EXISTS (SELECT 1 FROM cron.job WHERE jobname = 'cleanup_activity_logs_hourly') THEN
+        PERFORM cron.unschedule((SELECT jobid FROM cron.job WHERE jobname = 'cleanup_activity_logs_hourly'));
+    END IF;
+END
+$$;
+
+DROP TABLE IF EXISTS activity_logs;