Add tombstone types and schema migration as foundation for the tombstone epic (bd-vw8) which replaces deletions.jsonl with inline tombstones. Changes: - Add tombstone fields to Issue struct: DeletedAt, DeletedBy, DeleteReason, OriginalType - Add StatusTombstone constant and IsTombstone() helper method - Update Status.IsValid() to accept tombstone status - Create migration 018_tombstone_columns.go for new database columns - Update schema.go with tombstone columns: deleted_at, deleted_by, delete_reason, original_type - Update all issue insert/update/scan operations across: - issues.go (insertIssue, insertIssues) - queries.go (GetIssue, GetIssueByExternalRef, SearchIssues) - dependencies.go (scanIssues, scanIssuesWithDependencyType) - transaction.go (scanIssueRow, GetIssue, SearchIssues) - multirepo.go (import operations) - ready.go (GetReadyWork, GetStaleIssues) - labels.go (GetIssuesByLabel) - Add test for IsTombstone() helper - Update migration test to include tombstone columns Unblocks: bd-olt (TTL logic), bd-3b4 (delete command), bd-0ih (merge updates), bd-dve (import/export) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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