use crate::db::UserId;use sea_orm::entity::prelude::*;use serde::Serialize; /// A user who has signed the CLA.#[derive(Clone, Debug, Default, PartialEq, Eq, DeriveEntityModel, Serialize)]#[sea_orm(table_name = "contributors")]pub struct Model {    #[sea_orm(primary_key)]    pub user_id: UserId,    pub signed_at: DateTime,} #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]pub enum Relation {    #[sea_orm(        belongs_to = "super::user::Entity",        from = "Column::UserId",        to = "super::user::Column::Id"    )]    User,} impl ActiveModelBehavior for ActiveModel {} impl Related<super::user::Entity> for Entity {    fn to() -> RelationDef {        Relation::User.def()    }}