We have one find_sequence_name() method in database_manager that is there because we needed it in the adodb stuff, to find one sequence exclusively for Oracle. In fact only Oracle (ADObd) implements/uses it.
So I think it's better if we drop it from public API. Only Oracle SQL generator needs to find, sometimes, the sequence name, and the method for doing that is already there, no need to expose it to the public.
Drop method from public API (database manager)
Drop corresponding tests (ddl tests, xmldb tests)
Drop ADOdb Oracle driver