Sean McGivern f2d50af917 Migrate MR commits and diffs to new tables ... Previously, we stored these as serialised fields - `st_{commits,diffs}` - on the `merge_request_diffs` table. These now have their own tables - `merge_request_diff_{commits,diffs}` - with a column for each attribute of the serialised data. Add a background migration to go through the existing MR diffs and migrate them to the new format. Ignore any contents that cannot be displayed. Assuming that we have 5 million rows to migrate, and each batch of 2,500 rows can be completed in 5 minutes, this will take about 7 days to migrate everything.		2017-08-03 13:20:26 +01:00
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.gitkeep
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