You are welcome to fork our code for OpenBenches

https://github.com/openbenches/openbenches.org/

It is fairly standard PHP + MySQL.

We use Auth0 for authentication - people editing have to use a social network to log in. That significantly reduces (but doesn't eliminate) the need for moderation.

As for maintenance - once in a while dependabot will say a PHP library is out of date and I'll run the update.

Please do launch your project; it sounds like fun