migration.rb:63-65: Lock the upgrade procedure in order...

[0pdd]

The puzzle DEV-20cb5df8 from #DEV has to be resolved:

vcs4sql/lib/vcs4sql/sqlite/migration.rb

Lines 63 to 65 in 98c38cd

	# @todo #/DEV Lock the upgrade procedure in order to avoid the cases
	# when multiple processes are going to modify/upgrade the same database
	# schema. No concurrent upgrades is allowed so far.

The puzzle was created by @dgroup on 15-Jan-20.

role: DEV.

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