[CVAT][Exchange Oracle] Use UUID type in postgres #2624
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Currently varchar is used for primary keys. This is very ineficient and prone to errors as well (nothing is stopping the database from accumulating records with primary keys that are invalid UUIDs, making it much harder to adopt these changes in the future.
It make sense to fix this before actual launch to prevent problems in the future.
Reference: https://stackoverflow.com/questions/32189129/performance-difference-between-uuid-char-and-varchar-in-postgresql-table