Add sorting of posts.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Fix a method not having the correct name.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Merge branch 'master' of https://github.com/opfo/app

* 'master' of https://github.com/opfo/app:
  Remove unused header file
  Rename database access class
  Add an SQL execution method
  Create database access spec
  Use strong retention