use crate::db::{MessageId, UserId};use sea_orm::entity::prelude::*; #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]#[sea_orm(table_name = "channel_message_mentions")]pub struct Model {    #[sea_orm(primary_key)]    pub message_id: MessageId,    #[sea_orm(primary_key)]    pub start_offset: i32,    pub end_offset: i32,    pub user_id: UserId,} impl ActiveModelBehavior for ActiveModel {} #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]pub enum Relation {    #[sea_orm(        belongs_to = "super::channel_message::Entity",        from = "Column::MessageId",        to = "super::channel_message::Column::Id"    )]    Message,    #[sea_orm(        belongs_to = "super::user::Entity",        from = "Column::UserId",        to = "super::user::Column::Id"    )]    MentionedUser,} impl Related<super::channel::Entity> for Entity {    fn to() -> RelationDef {        Relation::Message.def()    }} impl Related<super::user::Entity> for Entity {    fn to() -> RelationDef {        Relation::MentionedUser.def()    }}