use crate::db::{BufferId, UserId};use sea_orm::entity::prelude::*; #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]#[sea_orm(table_name = "observed_buffer_edits")]pub struct Model {    #[sea_orm(primary_key)]    pub user_id: UserId,    pub buffer_id: BufferId,    pub epoch: i32,    pub lamport_timestamp: i32,    pub replica_id: i32,} #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]pub enum Relation {    #[sea_orm(        belongs_to = "super::buffer::Entity",        from = "Column::BufferId",        to = "super::buffer::Column::Id"    )]    Buffer,    #[sea_orm(        belongs_to = "super::user::Entity",        from = "Column::UserId",        to = "super::user::Column::Id"    )]    User,} impl Related<super::buffer::Entity> for Entity {    fn to() -> RelationDef {        Relation::Buffer.def()    }} impl Related<super::user::Entity> for Entity {    fn to() -> RelationDef {        Relation::User.def()    }} impl ActiveModelBehavior for ActiveModel {}