fix: clear scheduled_at for non-Scheduled statuses (#123)

Co-authored-by: Flegma <Flegma@users.noreply.github.com>

Author: Flegma

hasura/triggers/matches.sql

@@ -314,13 +314,17 @@ BEGIN
     END IF;
 
     scheduled_at := COALESCE(NEW.scheduled_at);
-    
+
     -- We need to correctly handle the cancels_at field, since matches open 15 minutes before the scheduled time.
     -- Therefore, cancels_at should be set relative to the scheduled time, not the current time.
-    IF (scheduled_at IS NOT NULL AND scheduled_at < NOW()) THEN
+    IF (scheduled_at IS NOT NULL AND scheduled_at < NOW() AND NEW.status = 'Scheduled') THEN
         NEW.scheduled_at = NOW();
     END IF;
 
+    IF NEW.status != 'Scheduled' THEN
+        NEW.scheduled_at = null;
+    END IF;
+
     IF (NEW.status = 'WaitingForCheckIn' AND OLD.status != 'WaitingForCheckIn')  THEN
         IF _auto_cancellation THEN
             NEW.cancels_at = COALESCE(scheduled_at, NOW()) + (_auto_cancel_duration)::interval;