You would not store the 32 hex characters plus 4 hyphen characters as strings in the db. That UUID string format is for human readable display not disk storage.
(To downvoters, if 16 bytes is incorrect, please reply with what you believe to be the correct # of bytes for UUID.)
To clarify, UUID is stored in the db as 16 bytes (128 bits): https://en.wikipedia.org/wiki/Universally_unique_identifier#...
You would not store the 32 hex characters plus 4 hyphen characters as strings in the db. That UUID string format is for human readable display not disk storage.
(To downvoters, if 16 bytes is incorrect, please reply with what you believe to be the correct # of bytes for UUID.)