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Clean up schema for table events
From https://gitlab.com/gitlab-com/infrastructure/issues/1709 (private to GitLab employees):
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Missing FK: project_id -> projects (11256 entries violate this rule) -
Missing constraint: author_id NOT NULL: https://gitlab.com/gitlab-org/gitlab-ce/issues/35586
The following will be taken care of by https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12463:
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Get rid of events.dataonce push events data has been moved to a separate table, since it does not appear to be used for other event types -
Missing FK: author_id -> users (8763 entries violate this rule) -
Missing constraint: action NOT NULL -
Remove the column events.titleas it appears to always be NULL- Confirmed that as of July 25th, 2017 this column is always NULL
Instead of using polymorphic types we should use separate columns for the different target types (diff_note_id, discussion_note_id, etc). This allows us to re-use existing functionality instead of having to write our own foreign key related code. The number of columns added is not that great after all.