Fix server_stats db file when deleting server

Silversthornrequested to merge
dev-FixStatsFilesDeletion into dev

What does this MR do and why?

___This merge fix the locking database for stats server db file___

This fix allow the full deletion of the server folder
Fixing issues #129 (closed)

How to set up and validate locally

1 - Install a new server
2 - Run it once to populate the stats db file
3 - Stop the server and delete the files

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  • Have you checked this doesn't interfere/conflict/duplicate someone elses work?
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