feat: WIP relationships and threads

src/service/rooms/threads/data.rs

@@ -0,0 +1,15 @@
+use crate::{PduEvent, Result};
+use ruma::{api::client::threads::get_threads::v1::IncludeThreads, OwnedUserId, RoomId, UserId};
+
+pub trait Data: Send + Sync {
+    fn threads_until<'a>(
+        &'a self,
+        user_id: &'a UserId,
+        room_id: &'a RoomId,
+        until: u64,
+        include: &'a IncludeThreads,
+    ) -> Result<Box<dyn Iterator<Item = Result<(u64, PduEvent)>> + 'a>>;
+
+    fn update_participants(&self, root_id: &[u8], participants: &[OwnedUserId]) -> Result<()>;
+    fn get_participants(&self, root_id: &[u8]) -> Result<Option<Vec<OwnedUserId>>>;
+}