/usr/lib/ruby/vendor_ruby/ is in ruby-dbi 0.4.5-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/dbi.rb
/usr/lib/ruby/vendor_ruby/dbi/
/usr/lib/ruby/vendor_ruby/dbi/base_classes.rb
/usr/lib/ruby/vendor_ruby/dbi/base_classes/
/usr/lib/ruby/vendor_ruby/dbi/base_classes/database.rb
/usr/lib/ruby/vendor_ruby/dbi/base_classes/driver.rb
/usr/lib/ruby/vendor_ruby/dbi/base_classes/statement.rb
/usr/lib/ruby/vendor_ruby/dbi/binary.rb
/usr/lib/ruby/vendor_ruby/dbi/columninfo.rb
/usr/lib/ruby/vendor_ruby/dbi/exceptions.rb
/usr/lib/ruby/vendor_ruby/dbi/handles.rb
/usr/lib/ruby/vendor_ruby/dbi/handles/
/usr/lib/ruby/vendor_ruby/dbi/handles/database.rb
/usr/lib/ruby/vendor_ruby/dbi/handles/driver.rb
/usr/lib/ruby/vendor_ruby/dbi/handles/statement.rb
/usr/lib/ruby/vendor_ruby/dbi/row.rb
/usr/lib/ruby/vendor_ruby/dbi/sql.rb
/usr/lib/ruby/vendor_ruby/dbi/sql/
/usr/lib/ruby/vendor_ruby/dbi/sql/preparedstatement.rb
/usr/lib/ruby/vendor_ruby/dbi/sql_type_constants.rb
/usr/lib/ruby/vendor_ruby/dbi/trace.rb
/usr/lib/ruby/vendor_ruby/dbi/types.rb
/usr/lib/ruby/vendor_ruby/dbi/typeutil.rb
/usr/lib/ruby/vendor_ruby/dbi/utils.rb
/usr/lib/ruby/vendor_ruby/dbi/utils/
/usr/lib/ruby/vendor_ruby/dbi/utils/date.rb
/usr/lib/ruby/vendor_ruby/dbi/utils/tableformatter.rb
/usr/lib/ruby/vendor_ruby/dbi/utils/time.rb
/usr/lib/ruby/vendor_ruby/dbi/utils/timestamp.rb
/usr/lib/ruby/vendor_ruby/dbi/utils/xmlformatter.rb