Comment 6 for bug 868197

OK. Tried forcing it to run tasks for the non-current database version and it doesn't work correctly. It checks what the current database version and only runs tasks for that and above. So an example:

Run with -v "4.9"
Current db version = 4.10

Only looks for tasks for 4.10 and above.

The desired behaviour would be to force it to run any new tasks for 4.9 and ignore the fact it's at 4.10.