Implemented new Permission system on the DB side.

ref #22

src/models/entities/User.ts

@@ -1,22 +1,16 @@
 import { IsBoolean, IsEmail, IsInt, IsNotEmpty, IsOptional, IsPhoneNumber, IsString, IsUUID } from "class-validator";
-import { Column, Entity, JoinTable, ManyToMany, ManyToOne, OneToMany, PrimaryGeneratedColumn } from "typeorm";
+import { ChildEntity, Column, JoinTable, ManyToMany, OneToMany } from "typeorm";
 import { config } from '../../config';
 import { Permission } from './Permission';
+import { Principal } from './Principal';
 import { UserAction } from './UserAction';
 import { UserGroup } from './UserGroup';
 
 /**
  * Defines a admin user.
 */
-@Entity()
-export class User {
-  /**
-  * autogenerated unique id (primary key).
-  */
-  @PrimaryGeneratedColumn()
-  @IsInt()
-  id: number;
-
+@ChildEntity()
+export class User extends Principal {
   /**
   * uuid
   */
@@ -78,13 +72,6 @@ export class User {
   @IsNotEmpty()
   password: string;
 
-  /**
-  * permissions
-  */
-  @IsOptional()
-  @ManyToOne(() => Permission, permission => permission.users, { nullable: true })
-  permissions?: Permission[];
-
   /**
   * groups
   */