D11753: baloodb: Add clean command

[Michael Heidelbach]

michaelh added a task: T8250: Sanitize the database.

REPOSITORY
  R293 Baloo

REVISION DETAIL
  https://phabricator.kde.org/D11753

To: michaelh, #baloo, #frameworks
Cc: bruns, cfeck, smithjd, ashaposhnikov, michaelh, astippich, spoorun, ngraham, alexeymin
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