Implement automatic database migration to add the dirty_issues table
for existing databases that were created before the incremental export
feature (bd-39) was implemented.
Changes:
- Add migrateDirtyIssuesTable() function in sqlite.go
- Check for dirty_issues table existence on database initialization
- Create table and index if missing (silent migration)
- Call migration after schema initialization in New()
The migration:
- Queries sqlite_master to check if dirty_issues table exists
- If missing, creates the table with proper schema and index
- Happens automatically on first database access after upgrade
- No user intervention required
- Fails safely if table already exists (no-op)
Testing:
- Created test database without dirty_issues table
- Verified table was auto-created on first command
- Verified issue was properly marked dirty
- All existing tests pass
This makes the incremental export feature (bd-39) work seamlessly
with existing databases without requiring manual migration steps.
Closes bd-51
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Co-Authored-By: Claude <noreply@anthropic.com>
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