Maybe data modeling is something that's officially a "manager-level task" at your company, so it's something you have to be involved in. But I would try to err on the side of delegating too much, rather than too little. If you have knowledge in a certain area that gives you special insight into how to improve implementation of code, I would challenge you to try to disseminate that amongst your team and hold them accountable for following it themselves, rather than setting yourself up as a gatekeeper.

All this assumes you trust your team to be thoughtful and do good work. If not then that's a whole 'nother issue.