MeanSquaredError

@rbock A unified (supporting all backends) transaction manager for sqlpp23 is on my TODO list. Just need to find the time to work on it.

Wouldn't it make sense to tackle this problem after the support for `std::optional` makes it into the library? I have been peeking now and then at the [std::optional branch](https://github.com/rbock/sqlpp11/tree/optional-no-dynamic) and...

The [LLVM backend for Idris 2](https://sr.ht/~cypheon/rapid/) is under active development and it is almost fully functional. Judging from the README, the only thing that it lacks at the moment is...

OK, thanks for approving the idea. I will try to implement that functionality in about a week or so.

Thank you for the clarification. I imagine a logging interface similar to the following: ``` namespace tao::pq { enum log_type { log_type_query = 0x01, log_type_result = 0x02 }; using log_handler...

@Arthapz Thanks for the feedback! 1. I did find one this GCC issue that seems to be related to dependency scanning and header units. I am leaving the URL just...