Thanks for reminding me!

> Were you able to track down what you did?

No, there's no SQL file or log left, sorry. I think i dropped the
indexes, altered the columns manually, then recreated the indexes, all
directly in MySQL.

This is what we are using in back_mysql.py since 2011:

    def create_multilink_table(self, spec, ml):
        sql = '''CREATE TABLE `%s_%s` (linkid INTEGER,
            nodeid INTEGER) ENGINE=%s'''%(spec.classname, ml,
                self.mysql_backend)
        self.sql(sql)
        self.create_multilink_table_indexes(spec, ml)

I went through our backend code changes, and this one seems to be the
only one regarding the linkid/nodeid types.