KTVU announced yesterday that weekend anchor Sara Sidner will leave Channel 2 on Dec. 31 to become a correspondent for CNN International. TV columnist Susan Young said last week that Channel 2 wanted Sidner to sign a five-year contract, but she didn’t want to be tied down that long since she had network prospects. In a press release from Channel 2, Sidner is quoted as saying: “A station is made up of people, and at KTVU I respect and love the people. That is what makes this decision so difficult. It’s like leaving a family but sometimes you need to jump at opportunities. That still doesn’t make it easy.”