feat(store): also delete thread subscriptions when deleting a room in db

Author: bnjbvr

crates/matrix-sdk-base/src/store/memory_store.rs

@@ -754,6 +754,7 @@ impl StateStore for MemoryStore {
         inner.room_event_receipts.remove(room_id);
         inner.send_queue_events.remove(room_id);
         inner.dependent_send_queue_events.remove(room_id);
+        inner.thread_subscriptions.remove(room_id);
 
         Ok(())
     }

crates/matrix-sdk-sqlite/src/state_store.rs

@@ -1766,6 +1766,13 @@ impl StateStore for SqliteStateStore {
                 this.encode_key(keys::DEPENDENTS_SEND_QUEUE, &room_id);
             txn.remove_room_dependent_send_queue(&dependent_send_queue_room_id)?;
 
+            let thread_subscriptions_room_id =
+                this.encode_key(keys::THREAD_SUBSCRIPTIONS, &room_id);
+            txn.execute(
+                "DELETE FROM thread_subscriptions WHERE room_id = ?",
+                (thread_subscriptions_room_id,),
+            )?;
+
             Ok(())
         })
         .await?;