complete story 4.2 with qa tests

app/Models/Timeline.php

@@ -35,10 +35,10 @@ class Timeline extends Model
     }
 
     /**
-     * Get the updates for the timeline.
+     * Get the updates for the timeline, ordered chronologically (oldest first).
      */
     public function updates(): HasMany
     {
-        return $this->hasMany(TimelineUpdate::class);
+        return $this->hasMany(TimelineUpdate::class)->orderBy('created_at', 'asc');
     }
 }