hawese-wallet/database/migrations/2018_11_27_091146_create_transactions_table.php

<?php
// Copyright 2019 Hackware SpA <human@hackware.cl>
// This file is part of "Hackware Web Services Wallet" and licensed under
// the terms of the GNU Affero General Public License version 3, or (at your
// option) a later version. You should have received a copy of this license
// along with the software. If not, see <https://www.gnu.org/licenses/>.

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateTransactionsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('transactions', function (Blueprint $table) {
            $table->increments('id');
            $table->string('wallet_uid', 100);
            $table->foreign('wallet_uid')
                ->references('uid')
                ->on('wallets')
                ->onUpdate('cascade')
                ->onDelete('restrict');
            $table->unsignedInteger('currency_id');
            $table->foreign('currency_id')
                ->references('id')
                ->on('currencies')
                ->onUpdate('restrict')
                ->onDelete('restrict');
            $table->decimal('amount', 16, 8);
            $table->string('comment', 255)->nullable();
            $table->timestamp('created_at')->nullable()->index();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('transactions');
    }
}