I asked the same thing on Discord where he also showcased it. He answered the question with this.

> I wanted to make something that makes intuitive sense to me, and I wanted to make a sql version of what lazygit does, namely you can just jump in and there's no need for external documentation. To navigate the harlequin with keyboard only you have to learn the keybindings. Also I though it was quite hard to connect to databases via the cli and install adapters (again, documentation necessary). I wanted to have a tool that you can just run and its intuitive. There's definitely more features in harlequin and I went with more lightweight, though sqlit has SSH tunnels, which harlequin lacks.

When I linked lazysql[0], he replied with this

> That was my original inspiration. Same problem with harlequin, I didn't feel like it was intutive and to follow the "lazy" mindset of lazydocker and lazygit, it should just be easy and not require looking up keybindings. Lazysql ended up with too many features for my taste to the point it was difficult to use

[0]: https://github.com/jorgerojas26/lazysql

I've recently been trying to find a good SQL TUI client, and one of the ones I tried was Harlequin. The main disadvantage, which every other SQL TUI I tried also suffers from, is that they don't comprehensively show every type of database object in the browser pane (e.g. tables, views, indexes, procedures). For example Harlequin only shows tables. This means that when you want to view one of the missing ones, you have to run a query. This means that you have to already know that the object you are looking for exists: there's no way to get a good overview of what you have in the database just by glancing at the browser. For me this sort of defeats the point of having a TUI in the first place.

It seems like the OP's offering has the same problem, although it does offer more objects than Harlequin. I'll be bookmarking it to see how it develops.