use crate::db::BufferId;use sea_orm::entity::prelude::*; #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]#[sea_orm(table_name = "buffer_operations")]pub struct Model {    #[sea_orm(primary_key)]    pub buffer_id: BufferId,    #[sea_orm(primary_key)]    pub epoch: i32,    #[sea_orm(primary_key)]    pub lamport_timestamp: i32,    #[sea_orm(primary_key)]    pub replica_id: i32,    pub value: Vec<u8>,} #[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,} impl Related<super::buffer::Entity> for Entity {    fn to() -> RelationDef {        Relation::Buffer.def()    }} impl ActiveModelBehavior for ActiveModel {}