db:seed cleanup

be/database/factories/TimeblockFactory.php

@@ -20,7 +20,11 @@ class TimeblockFactory extends Factory
         $start = fake()->dateTimeBetween('now', '+3 weeks');
         $end = Carbon::instance($start)->addHours(fake()->numberBetween(3, 5));
 
+        // get random subtask
+        $subtask = \App\Models\SubTask::all()->random();
+
         return [
+            'sub_task_id' => $subtask->id,
             'start' => $start,
             'end' => fake()->dateTimeBetween($start, $end),
         ];