I'm in a similar boat and I'd like to also know if anyone has any resources for setting up a good pricing model for the initial implementation vs potential futu

I'm in a similar boat and I'd like to also know if anyone has any resources for setting up a good pricing model for the initial implementation vs potential future updates. If they just want a one off project I'd probably just hardcode most data. If they asked for a CMS or I thought it fit their need then I'd recommend setting it up and probably charge more for that initial implementation. However, when it comes to actual code maintenance/updates does anyone have any experience with varying levels of pricing for this? Do you just charge the same hourly rate you would've charged before?