fix: database migrations FK relations.

fix: database columns indexing.

server/src/models/Vendor.js

@@ -1,61 +0,0 @@
-import { Model } from 'objection';
-import TenantModel from 'models/TenantModel';
-
-export default class Vendor extends TenantModel {
-  /**
-   * Table name
-   */
-  static get tableName() {
-    return 'vendors';
-  }
-
-  /**
-   * Model timestamps.
-   */
-  get timestamps() {
-    return ['createdAt', 'updatedAt'];
-  }
-
-  /**
-   * Changes the vendor balance.
-   * @param {Integer} customerId 
-   * @param {Number} amount 
-   * @return {Promise}
-   */
-  static async changeBalance(vendorId, amount) {
-    const changeMethod = amount > 0 ? 'increment' : 'decrement';
-
-    return this.query()
-      .where('id', vendorId)
-      [changeMethod]('balance', Math.abs(amount));
-  }  
-
-  /**
-   * 
-   * @param {number} vendorId - Specific vendor id.
-   * @param {number} oldVendorId - The given old vendor id.
-   * @param {number} amount - The new change amount.
-   * @param {number} oldAmount - The old stored amount.
-   */
-  static changeDiffBalance(vendorId, oldVendorId, amount, oldAmount) {
-    const diffAmount = (amount - oldAmount);
-    const asyncOpers = [];
-
-    if (vendorId != oldVendorId) {
-      const oldVendorOper = Vendor.changeBalance(
-        oldVendorId,
-        (oldAmount * -1)
-      );
-      const vendorOper = Vendor.changeBalance(
-        vendorId,
-        amount,
-      );
-      asyncOpers.push(vendorOper);
-      asyncOpers.push(oldVendorOper);
-    } else {
-      const balanceChangeOper = Vendor.changeBalance(vendorId, diffAmount);
-      asyncOpers.push(balanceChangeOper);
-    }
-    return Promise.all(asyncOpers);
-  }
-}