I've got the bunch of services that all do the same thing on a different data model. Originally they were all different and completely custom. Over time, I've managed to get nearly all of the code practically identical across 8 services. The same code is duplicated 8 times, but I prefer that over when they were all different, because then they were all doing basically the same thing in 8 different ways.

I know that eventually I can move all the identical code out of there to its own service, and replace the 8 services with just 8 simple configuration lists, and that's definitely where we're going at some point in the future, but for now, the 8 times duplication is actually fine. People know these services and what they do, and I know they're conceptually all instances of the same thing, it's just not quite represented that way in the code yet. We'll get there.

It's possible a few still have some exceptions, so that needs to be figured out first, but due to the way the code is put together, there's no rush; people are only changing the parts they're meant to change anyway.