I don't think there are any files in or under CCM_HOME or the database path that are modified when a session is started but no data is created or modified. You could try starting a session and querying for objects that were created or modified in the last N days. If a database is truly dormant and nothing has been created or modified in, say, the last 60 days, that makes it a candidate. I would still email your user community to allow people to indicate whether it is still required or not.
Best regards,
David.
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