created:
    - database/migrations/2020_08_03_022804_create_notices_table.php
    - app/Notice.php
    - database/factories/NoticeFactory.php
models:
    User: { uuid: string, user_level_id: 'biginteger unsigned', name: string, email: string, email_verified_at: 'datetime nullable', password: string, status: 'boolean default:1', ip: 'string nullable', remember_token: 'string:100 nullable' }
    UserLevel: { name: string }
    Designation: { name: 'string unique' }
    Holiday: { date: 'date unique' }
    LeaveStatus: { name: 'string unique' }
    LeaveCategory: { uuid: 'string unique', name: 'string unique', max_in_year: tinyint }
    Leave: { uuid: 'string unique', user_id: 'id foreign', leave_category_id: 'id foreign', leave_status_id: 'id foreign default:1', date: date, description: 'text nullable' }
    Notice: { id: 'uuid primary', subject: string, message: text }
