Noticing db changes that don't happen in rails?

I am working on a rails application using MySQL as the database. The
customer has a legacy application which can update records in the
database. I want rails to know when this happens but things like
callbacks or observers will not work because the updates are not
happening in rails. I need rails to know because when these records
change I need to tell some web services about them. The same thing
applies I think if one used a MySQL gui to change some records, the
web server would not know about the changes. The only thing I can
think of doing is constantly running some ruby script that checks to
see if the database has changed, but I really do not want to do any
type of polling. I may be completely misinformed about how some of
these things work. Any help would be greatly appreciated.

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