PostgreSQL at Scale: Why UUIDv7 Outperforms Random UUIDs

While UUIDv4 provides essential security against IDOR vulnerabilities, its random nature causes costly B-Tree page splits in PostgreSQL, degrading write performance at scale. UUIDv7 solves this fundamental trade-off by maintaining time-ordered prefixes, enabling sequential index appends without fragmentation. For applications managing millions of database rows, this architectural choice between security and performance becomes critical—making UUIDv7 the smarter default for modern data infrastructure.