Fix bugs identified in staging tests

[krivard]

While testing quidel deletions in staging, it became clear that we missed a few things in review...

Prerequisites:

• Unless it is a documentation hotfix it should be merged against the dev branch
• Branch is up-to-date with the branch to be merged with, i.e. dev
• Build is successful
• Code is cleaned up and formatted

Summary

• add missing rowcount handling to database.py:Database.delete_batch()
• add missing rowcount-unsupported logic to delete_batch.py:main()
• add missing imports to delete_batch.py
• add missing argument to delete_batch.py:handle_file()
• add missing time_type logic to delete_batch.py:handle_file()
• add missing arguments to handle_file() call in delete_batch.py:main()

[chinandrew]