code: def encode_eternal_jwt_token(self, user, **custom_claims):
          
          return self.encode_jwt_token(
              user,
              override_access_lifespan=VITAM_AETERNUM,
              override_refresh_lifespan=VITAM_AETERNUM,
              **custom_claims
          )
docs: This utility function encodes a jwt token that never expires
  
          .. note:: This should be used sparingly since the token could become
                    a security concern if it is ever lost. If you use this
                    method, you should be sure that your application also
                    implements a blacklist so that a given token can be blocked
                    should it be lost or become a security concern