Fixes GH#523: older versions of bd could close issues without setting
the closed_at timestamp. When importing such issues, validation would
fail with "closed issues must have closed_at timestamp".
This fix adds defensive handling in all issue creation/validation paths:
- If status is "closed" and closed_at is nil, set closed_at to
max(created_at, updated_at) + 1 second
- Similarly for tombstones missing deleted_at
Applied to:
- batch_ops.go: validateBatchIssuesWithCustomStatuses (main import path)
- transaction.go: CreateIssue and CreateIssues
- queries.go: CreateIssue
- multirepo.go: upsertIssueInTx
Also adds comprehensive tests for the defensive fix.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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