Postgres.

models/transaction.js

@@ -0,0 +1,17 @@
+export default function (sequelize, DataTypes) {
+  const Transaction = sequelize.define('transaction', {
+    uuid: { type: DataTypes.UUID, defaultValue: DataTypes.UUIDV4 },
+    amount: DataTypes.DECIMAL,
+    description: DataTypes.STRING,
+    type: DataTypes.ENUM('direct', 'paypal'), // eslint-disable-line new-cap
+    ip: 'inet',
+  }, {
+    classMethods: {
+      associate: (models) => {
+        Transaction.belongsTo(models.user);
+      },
+    },
+  });
+
+  return Transaction;
+}