add server to monorepo.

packages/server/src/models/ExchangeRate.ts

@@ -0,0 +1,44 @@
+import bcrypt from 'bcryptjs';
+import { Model } from 'objection';
+import TenantModel from 'models/TenantModel';
+
+export default class ExchangeRate extends TenantModel {
+  /**
+   * Table name.
+   */
+  static get tableName() {
+    return 'exchange_rates';
+  }
+
+  /**
+   * Timestamps columns.
+   */
+  get timestamps() {
+    return ['createdAt', 'updatedAt'];
+  }
+
+  /**
+   * Model defined fields.
+   */
+  static get fields(){
+    return {
+      currency_code: {
+        label: 'Currency',
+        column: 'currency_code'
+      },
+      exchange_rate: {
+        label: 'Exchange rate',
+        column: 'exchange_rate',
+      },
+      date: {
+        label: 'Date',
+        column: 'date',
+      },
+      created_at: {
+        label: "Created at",
+        column: "created_at",
+        columnType: "date",
+      },
+    }
+  }
+}