public function up(): void 	{ 		Schema::create('email_activities', function (Blueprint $table): void { 			$table->uuid('id')->primary(); 			$table->uuid('client_survey_id'); 			$table->uuid('user_id')->nullable(); 			$table->unsignedTinyInteger('email_type'); 			$table->unsignedSmallInteger('count')->nullable(); 			$table->timestamps();  			$table->index(Model::CREATED_AT);  			$table->foreign('client_survey_id')->references('id')->on('client_surveys')->cascadeOnDelete(); 			$table->foreign('user_id')->references('id')->on('users')->cascadeOnDelete(); 		}); 	}