text: Title: Server Error 500 after Bare Metal Update DB upgrade 1.4.2 -> 1.5.0
  Body: I had a bare metal install of 1.4.2 running on buster. 
  Now after upgrade to bullseye I installed 1.5.0 and just copied the paperless.conf file. 
  Most of the stuff runs fine, but: While trying to access E-Mail accounts , E-Mail rules and planned tasks from the admin menu I get a Server Error 500. My guess is, that this could be due to some db structure incompatibilities, but tbh I do not have a glue.
  
  I do not see anything in any log? 
  
  What could I do?
  
  What is a clean upgrade path for bare metal?