by Jannik Arndt
While the Akka documentation is incredibly well written, it has surprisingly few images. Since I visualize concepts to remember them, here is my take on how Event Sourcing in Akka Persistence works:
Changing the password for a PostgreSQL database user involves two steps: The change in the database and the change in the application code. This blog post describes how to do this without any downtime or failed authentication tries.
The PostgreSQL installation comes with a great tool, psql, to administer and inspect the database. pgcli extends this with syntax highlighting and autocompletion.