Phase 1 of tombstone migration: bd delete now creates tombstones instead
of hard-deleting issues.
Key changes:
- Add CreateTombstone() method to SQLiteStorage for soft-delete
- Modify executeDelete() to create tombstones instead of removing rows
- Add IsExpired() method with 30-day default TTL and clock skew grace
- Fix deleted_at schema from TEXT to DATETIME for proper time scanning
- Update delete.go to call CreateTombstone (single issue path)
- Still writes to deletions.jsonl for backward compatibility (dual-write)
- Dependencies are removed when creating tombstones
- Tombstones are excluded from normal searches (bd-1bu)
TTL constants:
- DefaultTombstoneTTL: 30 days
- MinTombstoneTTL: 7 days (safety floor)
- ClockSkewGrace: 1 hour
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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