liwo/database/seeds/WorkSeeder.php

<?php

use App\Models\Work;
use Illuminate\Database\Seeder;

class WorkSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        Work::insert(
            factory(Work::class, 2000)->raw()
        );

        $businessId = 1779;
        Work::inRandomOrder()->take(150)->update(['business_id' => $businessId]);

        $projects = [3566, 3567, 3568];

        foreach ($projects as $projectId) {
            Work::where('business_id', $businessId)
                ->whereNotIn('project_id', $projects)
                ->take(50)->update(['project_id' => $projectId, 'started_at' => \Carbon\Carbon::now()]);
        }

        $works = Work::where('business_id', $businessId)->get();
        foreach ($works as $work){
           \DB::table('works')->where('id', $work->id)
               ->update(['started_at' => \Carbon\Carbon::now()->subDays(rand(0,90))]);
        }
    }
}