Start work on restoring server-side code for chat messages

crates/collab/src/db/tables/channel_chat_participant.rs

@@ -0,0 +1,41 @@
+use crate::db::{ChannelChatParticipantId, ChannelId, ServerId, UserId};
+use rpc::ConnectionId;
+use sea_orm::entity::prelude::*;
+
+#[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
+#[sea_orm(table_name = "channel_chat_participants")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    pub id: ChannelChatParticipantId,
+    pub channel_id: ChannelId,
+    pub user_id: UserId,
+    pub connection_id: i32,
+    pub connection_server_id: ServerId,
+}
+
+impl Model {
+    pub fn connection(&self) -> ConnectionId {
+        ConnectionId {
+            owner_id: self.connection_server_id.0 as u32,
+            id: self.connection_id as u32,
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {
+    #[sea_orm(
+        belongs_to = "super::channel::Entity",
+        from = "Column::ChannelId",
+        to = "super::channel::Column::Id"
+    )]
+    Channel,
+}
+
+impl Related<super::channel::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Channel.def()
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}