Added by Michael Moll almost 2 years ago.
Updated about 1 year ago.
Is duplicate of
Added by Dominic Cleal almost 2 years ago
Fixes #21100 - set DB migration compatibility to 4.2
Put all existing DB migrations into 4.2 compatibility mode as they don'tspecify null => true on timestamp columns etc.
Applied in changeset bc038098bc2f96986442ae2fffac4e4746933cec.
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