It's pretty easy to migrate to UUIDs later if required, as long as you don't leak your keys. My work made their own uuid-like scheme, similar to UUIDv1 which i

It's pretty easy to migrate to UUIDs later if required, as long as you don't leak your keys. My work made their own uuid-like scheme, similar to UUIDv1 which incorporates several elements like machine ID and timestamp. The mistake was twofold: first they exposed them (so people started using them) but, worse, they made them easily reversible, so people started decoding the information in them. People would naturally see one and think "oh this is a record from place X". Of course that might not be true following subsequent data corrections, but the key can't change.