Yes, this is standard. And the point is performance. The needs of user-facing ID's (short alphanumeric, randomly ordered) tend to be pretty orthogonal to the needs of internal ID's (raw bits, monotonically increasing, maybe timestamp data).
replyYep, you'll probably join like 20 of those for each public uuid lookup. There are potential reasons not to do it this way, but it's a good default.
replyHigher density for indexes you use for joins. Also you can then use UUIDv4 to hide creation times if that's sensitive too.
replydeleted
replyIt makes more sense to have two columns yes, one autoincrement for the primary key, and another uuidv4. Because uuids are too large and makes indexes slower
reply