What does this MR do?
Use now() as default timestamp for MySQL
Why was this MR needed?
This patch was originally from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13560 which tried to stop MySQL from using CURRENT_TIMESTAMP. However, as it seems, on some MySQL version (e.g. 4.7) and under some configuration, 0 is not allowed.
We never intended to use the default value, so any value should be fine. However, now() is picked because there's some weird issue in factory_girl along with MySQL, which stops Rails auto-generating timestamps, causing it use the default. Use now() could somehow "fix" this issue when it happened.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary - Review
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Has been reviewed by Backend -
Has been reviewed by Database
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