thank you very much for feedback. Sorry for the late reply ... I missed the forum-notification.
The wear-out of micro-sd-cards is a well known problem. I would use industrial-grade cards or ssd-drive (if power and size not matter). Industrial grade micro-sd are expensive. The "pSLC" type cards would be a good fit "better power-fail protection, very durable ... not very expensive (from 30 EUR...)".