app/Actions/Projects/DeleteProject.php

@@ -14,6 +14,7 @@ class DeleteProject
         DB::transaction(function () use ($project): void {
             $baseTemplate = $project->baseTemplate()->first();
 
+            $project->ticketStatuses()->delete();
             $project->delete();
             $baseTemplate?->delete();
         });

tests/Feature/Projects/ProjectControllerTest.php

@@ -805,6 +805,9 @@ class ProjectControllerTest extends TestCase
         $this->assertDatabaseMissing('board_columns', [
             'id' => $boardColumn->id,
         ]);
+        $this->assertDatabaseMissing('ticket_statuses', [
+            'id' => $ticketStatus->id,
+        ]);
         $this->assertDatabaseMissing('tickets', [
             'id' => $ticket->id,
         ]);