Sounds like a job for the Lego Island Guy
DiggyDiggyMole
And Momo, our cat:
Our senior, Pegas, who unfortunately passed 1st May 2023:
Pandora says hello:
Even more pictures
Let him munch on some dirt, and he'll reward you with a Terrabite.
I am not a lawyer, so take it with a grain of salt, but looking at the Mietrechtsgesetz (law of tenancy), § 16b "Kaution", it says that the landlord must deposit the rent deposit into a savings account (or something that has a similar yield, is as secure and separates it from the wealth of the landlord), and yes, assuming there are no damages that need to be paid, it seems the landlord is obliged to return the rent deposit including all interest. Upon request, the landlord must inform you about the savings account in writing. The similar-yield-as-a-savings-account-thing is quite wishy-washy, unfortunately.
There's syncthing-fork that I hope will continue to be maintained (especially as they committed a guide on how to switch from the official app 2hrs ago). I've used it already before the depreciation of the official app and it's working reliably.
It looks like Play Store releases are planned to be stopped, so it's probably best to install it either directly from the GitHub releases (for this, Obtanium is also a great tool for finding and updating apps from lotta sources), or with F-Droid.