Backfill work_item_dates_sources with epic dates data
requested to merge 454426-implement-and-enqueue-backfilling-of-due-dates-from-epic-to-work-item into master
What does this MR do and why?
Backfill work_item_dates_sources with epic dates data
For each existing epic, we need to have a work_item_dates_sources record associated to the epic's work item. These records store the epic dates data including the booleans start_date_is_fixed and due_date_is_fixed that should have a default value even if dates are not present.
The epics.issue_id column has been backfilled with !143844 (merged) and finalized for self-managed in !152625 (diffs).
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Related to #454426
Edited by Eugenia Grieff