Hi Mohamed,
If your work involves adding new columns to the database, then one of the things your development will need is a database schema migration task or script which, when run, will update the database schema and insert your new columns and tables. You can see many examples of these from previous development here:
If you have already added a schema migration, then you still need to execute it as part of your installation.
This is what we do during the upgrade process when we run the upgrade task - it looks for new schema migrations and then applies them consecutively:
- php symfony tools:upgrade-sql
I would suggest that you review our existing schema migrations, and develop one for your customization if you have not already. If you have already added one, try running the upgrade task, then clear the application cache and restart services, and let us know if that helps.
Cheers,