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Add bulk_import_export_batches & bulk_import_batch_trackers db tables

George Koltsov requested to merge georgekoltsov/bulk-imports-db-changes-for-in-batches into master

What does this MR do and why?

This MR makes changes to bulk_import_* database tables to lay foundation for performing GitLab Direct Transfer (aka GitLab Migration)

  • Add bulk_import_export_batches db table
    • Used to keep track of state of relation export of a batch (belongs to BulkImports::Export)
  • Add bulk_import_batch_trackers db table
    • Used to keep track of state of relation import of a batch (belongs to BulkImports::Tracker)
  • Add 3 new columns to bulk_import_exports db table
    • batched - to indicate if export is performed in batches. Defaults to fals
    • batches_count - to indicate the total number of batches exported
    • total_objects_count - to indicate how many objects (rows) were exported
  • Add 1 new column to bulk_import_export_uploads db table
    • batch_id - to assicate BulkImport::ExportUpload with an export batch (in the future MR)
  • Add 1 new column to bulk_import_trackers db table
    • batched - to indicate the the import should be performed in batches

Mentions #391219 (closed)

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