Fix Paste model and migration

app/Paste.php

@@ -19,7 +19,7 @@ class Paste extends Model
 		return $this->deletion !== null;
 	}
 
-	public function delete($reason, $deleted_by)
+	public function soft_delete($reason, $deleted_by)
 	{
 		if($this->isDeleted())
 		{

database/migrations/2016_05_27_230057_create_pastes_table.php

@@ -16,7 +16,7 @@ class CreatePastesTable extends Migration
 			$table->char('id', 6);
 			$table->string('language');
 			$table->timestamp('created_at');
-			$table->timestamp('expires_at');
+			$table->timestamp('expires_at')->nullable();
 
 			$table->primary('id');
         });