That almost certainly is to sign Brock Purdy to a contract extension. NFL.com's Judy Battista explains it like this: "The 49ers have shown a comfort level with allowing contract extensions to be made late into the summer,

The 49ers lost a number of important players this offseason but the team replenished in the draft and took another QB late.

Per The Athletic's Dianna Russini, Purdy and the 49ers are "inching closer" to working out a long-term deal that will make him one of the 10 highest-paid players in the NFL by average annual salary.