UUID v7 / ULID

UUID v7 is a time-ordered universally unique identifier that includes a Unix timestamp in milliseconds. It provides better database performance than UUID v4 because it's sortable and reduces index fragmentation.

ULID (Universally Unique Lexicographically Sortable Identifier) is a 128-bit identifier that is sortable by time, case-insensitive, URL-safe, and more compact than UUID. It uses Crockford's base32 encoding.

UUID v7 is better for standard UUID compatibility and database systems expecting UUID format. ULID is better for human readability, URL usage, and when you need case-insensitive identifiers. Both are time-sortable.