Some useful links:
call custom files (php or otherwise) into a laravel project. For me app.php file to which I added
'Helpers' => 'app\TradeLogic\engine' was in config/app.php
The app.php file didn’t help.
What actually worked was adding :
to the file bootstrap/autoload.php
The path shown is from the location of the autoload file.
To drop a column, need to run “composer require doctrine/dbal” otherwise a rollback that drops a column will fail.
If the filename of a migration got changed, or it got deleted, the ‘php artisan migrate’ command will complain. Need to run ‘composer dumpautoload’ shich will fix things.