init

migration/src/m20220101_000001_create_table.rs

@@ -505,6 +505,12 @@ impl MigrationTrait for Migration {
                             .to(Alias::new("message"), Alias::new("id"))
                             .on_delete(ForeignKeyAction::SetNull),
                     )
+                    .index(
+                        Index::create()
+                            .name("idx_message_channel_id_id")
+                            .col(Alias::new("channel_id"))
+                            .col(Alias::new("id")),
+                    )
                     .to_owned(),
             )
             .await?;