fix: Add on delete cascade to system_metrics (#10113)

Author: gt2345

master/static/migrations/20241023165301_system-metrics-on-del-casc.tx.up.sql

@@ -0,0 +1,11 @@
+/* 
+system_metrics needs delete cascade added to its foreign key constraint to runs(id) since 
+runs(experiment_id) has delete cascade constraint to experiments(id).
+*/
+
+ALTER TABLE system_metrics
+DROP CONSTRAINT system_metrics_trial_id_fkey;
+
+ALTER TABLE system_metrics
+ADD CONSTRAINT system_metrics_trial_id_fkey FOREIGN KEY (trial_id) REFERENCES runs(id)
+ON DELETE CASCADE;