I'm not sure if anyone here (still) uses
https://kosync.rustysoft.de as sync server. So, to whom it may concern:
In the last few days I have revised my sync server kosyncrs (and changed the data storage from Redis to PostgreSQL). In the evening (08.01.2025, somewhere around 08:00pm UTC+2) I will migrate the data and switch to the new version of kosyncrs. A (hopefully short) downtime cannot be avoided. If problems occur (afterwards), please let me know.