Contacts - not an issue ; )

dear Alex,
your application is all i missed in contact management in linux.
Clean and clearly structured interface etc.
I left the Elementary OS and installed Debian 11. So for the convenience - Peppermint OS.
I don't see the option to install elementary-sdk.
Is there any chance of running your program under Debian?
Thanks for your work. although I couldn't try the program yet.
Dan