feat: rewrite repositories with base entity repository class.

feat: sales and purchases status.
feat: sales and purchases auto-increment number.
fix: settings find query with extra columns.

server/src/models/Contact.js

@@ -26,7 +26,7 @@ export default class Contact extends TenantModel {
   /**
    * Closing balance attribute.
    */
-  closingBalance() {
+  get closingBalance() {
     return this.openingBalance + this.balance;
   }
 
@@ -77,66 +77,6 @@ export default class Contact extends TenantModel {
     };
   }
 
-  /**
-   * Change vendor balance.
-   * @param {Integer} customerId 
-   * @param {Numeric} amount 
-   */
-  static async changeBalance(customerId, amount) {
-    const changeMethod = (amount > 0) ? 'increment' : 'decrement';
-
-    return this.query()
-      .where('id', customerId)
-      [changeMethod]('balance', Math.abs(amount));
-  }
-
-  /**
-   * Increment the given customer balance.
-   * @param {Integer} customerId
-   * @param {Integer} amount
-   */
-  static async incrementBalance(customerId, amount) {
-    return this.query()
-      .where('id', customerId)
-      .increment('balance', amount);
-  }
-
-  /**
-   * Decrement the given customer balance.
-   * @param {integer} customerId -
-   * @param {integer} amount -
-   */
-  static async decrementBalance(customerId, amount) {
-    await this.query()
-      .where('id', customerId)
-      .decrement('balance', amount);
-  }
-
-  /**
-   * 
-   * @param {number} customerId 
-   * @param {number} oldCustomerId 
-   * @param {number} amount 
-   * @param {number} oldAmount 
-   */
-  static changeDiffBalance(customerId, oldCustomerId, amount, oldAmount) {
-    const diffAmount = amount - oldAmount;
-    const asyncOpers = [];
-
-    if (customerId != oldCustomerId) {
-      const oldCustomerOper = this.changeBalance(oldCustomerId, (oldAmount * -1));
-      const customerOper = this.changeBalance(customerId, amount);
-
-      asyncOpers.push(customerOper);
-      asyncOpers.push(oldCustomerOper);
-    } else {
-      const balanceChangeOper = this.changeBalance(customerId, diffAmount);
-      asyncOpers.push(balanceChangeOper);
-    }
-    return Promise.all(asyncOpers);
-  }
-
-
   static get fields() {
     return {
       created_at: {