Update of OpenWrt routers, 2nd gen
Updated hard- and software of routers and wireless accesspoints in my internal network
Thoughts on GDPR: How to delete data after usage?
How to organize databases, storage and applications to support deletion according to GDPR (DSGVO)
Meta-level operations on a Spark data frame
Transform a data frame dynamically, i. e. trim all string columns of a data frame which is not known at compile-time