Dated identifier

phil/doctrine-behaviours

Type	Kind	Role
`Contract\DatedIdentifiable`	interface	`datedId()`, `assignDatedId()`, `datedIdTime()`
`DatedIdentifierEntity`	trait	The primary key `id`, a `guid` column
`DatedIdentifierListener`	listener: `prePersist`	Gives a new record a UUID v7 of the clock's time

The identifier is a UUID v7 of symfony/uid: 48 bits of milliseconds followed by random bits. Identifiers sort in the order they were made, a primary key on them stays compact, and any tool that reads a UUID reads this one, with no format of our own to document or parse.

$ticket->datedId();                                // '019a4f2e-…', known once persisted
$ticket->datedIdTime();                            // the moment it holds

An identifier given beforehand is kept, and must be a UUID v7: assignDatedId() refuses anything else.

The time of creation can be read from the identifier: where that time is itself sensitive, use a random identifier. The listener has to be registered, since nothing else gives the entity its key.