Multiple server runs with sim-time reset server to past date

[vindard]

Bug

If we configure a sim-time (e.g. 2021-01-01) when the server starts it starts time from this point and does operations. If we stop the server and restart it, it doesn't continue from its progressed sim-time, but instead restarts time from the configured time.

This is especially problematic for job scheduling if for e.g. we create a facility and then stop the server, and start the server again to create another facility (all long-running jobs are now scheduled way into the future from the server's point of reference).

Potential fix

Flush sim-time to the db periodically and read from db before using default sim-time start in config