Anchors should be unique about boardrules HOT 3 CLOSED

Any ideas about this?

If we make the field unique in the DB, we may have problems with users who already have duplicate anchors. And if a user tries to add a new duplicate error, you get an ugly php general error output.

If we try to test for uniqueness in the entity set_anchor() method, we can more gracefully prevent adding new unique anchors... But any anchor will throw an error since the set_anchor method is run during the import method when getting existing data from the database, so it would always be found to be already existing/not unique, even if it is unique..

from boardrules.

I think during migration the script can check if there are duplicate anchors. If they exsist, just rename them and add log entry.

from boardrules.

This PR will make sure nobody can make duplicate anchors.
#168

from boardrules.