Add createdAt and updatedAt new fields to registration entity

[GillesInnov35]

Possible evolution

We think it'll be interesting to add 2 fields createdAt and updatedAt to registration entity allowing full management of customer registrations.

       CreatedAt:
              type: string
              description: The date, in RFC 3339 / ISO 8601 compliant format "YYYY-MM-DD", at which the Brand Registration has been created.
               format: date
               example: "2020-01-02"
               maxLength: 10

       UpdatedAt:
              type: string
              description: The last date, in RFC 3339 / ISO 8601 compliant format "YYYY-MM-DD",  at which the Brand Registration has been updated.
               format: date
               example: "2022-06-18"
               maxLength: 10

[alpaycetin74]

hi @GillesInnov35 , yes this seems useful, can be added as optional response parameter in GET operations.
It could be more useful for operational purposes if it would be a full timestamp (e.g. 2026-07-16T11:51:30+03:00)