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Add MergeRequests::MergeData and create table

Sincheol (David) Kimrequested to merge
560932-create-merge-requests-merge-data into master

What does this MR do and why?

Add MergeRequests::MergeData and create table

This is the first step of merge related data extraction from merge_requests table.

Here are a few things that are different from the original table

  • Rename merge_status -> mergeability_status to make it clear what it is. Also, it is now smallint instead of VARCHAR to make it more efficient at storing limited number of states.
  • Include project_id as a sharding key
  • Change type for in_progress_merge_commit_sha and merge_commit_sha from VARCHAR to BYTEA to be consistent with other SHA columns and save storage
  • Rename merge_when_pipeline_succeeds -> auto_merge_enabled to reflect the current alias

References

#560932

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Related to #560932

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