+ # The "shares" table contains principal URLs, and the "@" symbol
+ # is usually encoded to "%40". These queries do a regex match on
+ # the username after replacing the "%40" with a "@".
+ #
+ # As a precaution, I haven chosen not to delete based on the
+ # "calendar" field here. Nobody should have a calendar named
+ # "user%40example.com", but it's not impossible -- and we don't
+ # want to delete that calendar when the not-necessarily-related
+ # "user@example.com" account is removed. And the usual appearance
+ # of the user's email address in the "calendar" field happens when
+ # he is also the owner, so the calendar does get deleted in the
+ # normal situation.
+ sql_queries << "DELETE FROM shares WHERE REPLACE(owner,'%40','@') ~ $1;"
+ sql_queries << "DELETE FROM shares WHERE REPLACE(\"with\",'%40','@') ~ $1;"
+
+ connection = PG::Connection.new(@db_hash)