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be/database/migrations/2023_06_06_082226_add_deadline_to_subtasks_table.php

@@ -14,7 +14,7 @@ return new class extends Migration
     public function up()
     {
         Schema::table('sub_tasks', function (Blueprint $table) {
-            $table->timestamp('deadline')->after('tracked_time')->default(NULL);
+            $table->timestamp('deadline')->after('tracked_time')->nullable()->default(NULL);
         });
     }