fix: update modified_at by insert in user table (determined-ai#7949)

* fix: update `modified_at` by insert in user table

* fix: minor changes

* fix: return value properly

master/static/migrations/20230920130838_add-update-modified-at-in-user-table-by-insert.tx.down.sql

@@ -0,0 +1,19 @@
+CREATE OR REPLACE FUNCTION public.set_modified_time ()
+    RETURNS TRIGGER
+    AS $$
+BEGIN
+    IF (TG_OP = 'UPDATE') THEN
+        NEW.modified_at := now();
+        RETURN NEW;
+    END IF;
+    RETURN NEW;
+END;
+$$
+LANGUAGE plpgsql;
+
+DROP TRIGGER IF EXISTS autoupdate_users_modified_at on users;
+
+CREATE TRIGGER autoupdate_users_modified_at
+  BEFORE INSERT ON public.users
+  FOR EACH ROW
+  EXECUTE PROCEDURE public.set_modified_time();

master/static/migrations/20230920130838_add-update-modified-at-in-user-table-by-insert.tx.up.sql

@@ -0,0 +1,19 @@
+CREATE OR REPLACE FUNCTION public.set_modified_time ()
+    RETURNS TRIGGER
+    AS $$
+BEGIN
+    IF (TG_OP = 'INSERT' OR TG_OP = 'UPDATE') THEN
+        NEW.modified_at := now();
+        RETURN NEW;
+    END IF;
+    RETURN NEW;
+END;
+$$
+LANGUAGE plpgsql;
+
+DROP TRIGGER IF EXISTS autoupdate_users_modified_at on users;
+
+CREATE TRIGGER autoupdate_users_modified_at
+  BEFORE INSERT OR UPDATE ON public.users
+  FOR EACH ROW
+  EXECUTE PROCEDURE public.set_modified_time();