In LB#2299 we added the ability for a user to indicate a manual mapping between a listen and a Recording MBID.

We need to decide some additional features in the backend:

• What happens if a mapping is created and then our mapper gets better? Should we keep or remove the mapping row
• What if the mapping from the mapper is different to the manual one?
• We prioritise mappings 1) from your mappings, 2) from the mapper, 3) from other users' mappings. This means that a user could maliciously map someone else's unmapped tracks to bad MBIDs. To prevent this, we should only promote a mapping to the public mapping list if 3 or more users have done the same mapping (3 was chosen arbitrarily, can be changed if needed)