invoiceninja/app/Models/LookupAccount.php

<?php

namespace App\Models;

use Eloquent;

/**
 * Class ExpenseCategory.
 */
class LookupAccount extends LookupModel
{
    /**
     * @var array
     */
    protected $fillable = [
        'lookup_company_id',
        'account_key',
    ];

    public function lookupCompany()
    {
        return $this->belongsTo('App\Models\LookupCompany');
    }

    public static function createAccount($accountKey, $companyId)
    {
        if (! env('MULTI_DB_ENABLED')) {
            return;
        }

        $current = config('database.default');
        config(['database.default' => DB_NINJA_LOOKUP]);
    
        $server = DbServer::whereName($current)->firstOrFail();
        $lookupCompany = LookupCompany::whereDbServerId($server->id)
                            ->whereCompanyId($companyId)->first();

        if (! $lookupCompany) {
            $lookupCompany = LookupCompany::create([
                'db_server_id' => $server->id,
                'company_id' => $companyId,
            ]);
        }

        LookupAccount::create([
            'lookup_company_id' => $lookupCompany->id,
            'account_key' => $accountKey,
        ]);

        static::setDbServer($current);
    }
}