Sanes

public function up()
    {
        Schema::create('bills', function (Blueprint $table) {
            $table->id();
            $table->string('title');
            $table->string('comment')->nullable();
            $table->unsignedDecimal('amount')->default(0);
            $table->foreignId('user_id');
            $table->boolean('confirmed')->default(0);
            $table->timestamps();

            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
        });
    }

public function up()
    {
        Schema::create('expenses', function (Blueprint $table) {
            $table->id();
            $table->string('title');
            $table->decimal('amount')->default(0);
            $table->foreignId('user_id');
            $table->decimal('balance');
            $table->timestamps();

            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
        });
    }