SimanticsPlatform shutdown does not save existing virtual graphs before exiting
The changes done in #884 (closed) led to SimanticsPlatform
and the DB Session close logic no longer saving any virtual graphs when the DB session is closed.
The only thing the currently saves virtual graphs is AutosaveVirtualGraphs
job, which runs at 90 second intervals, when possible.
This causes very weird VG data disappearance problems when e.g. the user does something that writes to a crucial VG and then exits or restarts the application before AutosaveVirtualGraphs
has the chance to kick in.
This must be fixed in 1.55 for Apros 6.13 and possibly other older branches as well.