Joshua Harlow 89e023b6ad Ensure upgrade for sqlalchemy is protected by a lock ...

Make sure that upgrade() is thread-safe (as it appears not
to be) by using a lock that all connections from the same
engine will use.

Change-Id: I2b2b1be9e797099c8412fc6819465e550b1b934a
Closes-Bug: #1559496

2016-03-20 16:23:03 -07:00

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