The new versions of ADM 4.0.0 and 4.1.0 work with Sitecore 9.0 and 9.1 correspondingly.
These versions of ADM has the following functional:
- Remove all data for contacts that do not have interactions after the specified date.
- Remove all data for a specific contact defined by the contact id or source and identifier.
The module is available on the marketplace - https://marketplace.sitecore.net/Modules/Analytics_Database_Manager.aspx?sc_lang=en