Add migration to remove room state management tables.

src/db/sqlite/migrator/migrations/V7__no_more_room_state.rs

@@ -0,0 +1,10 @@
+use barrel::backend::Sqlite;
+use barrel::{types, Migration};
+
+pub fn migration() -> String {
+    let mut m = Migration::new();
+
+    m.drop_table_if_exists("room_info");
+    m.drop_table_if_exists("room_users");
+    m.make::<Sqlite>()
+}

src/matrix.rs

@@ -1,6 +1,6 @@
 use futures::stream::{self, StreamExt, TryStreamExt};
 use log::error;
-use matrix_sdk::{events::room::message::NoticeMessageEventContent, room::Joined, StoreError};
+use matrix_sdk::{events::room::message::NoticeMessageEventContent, room::Joined};
 use matrix_sdk::{
     events::room::message::{InReplyTo, Relation},
     events::room::message::{MessageEventContent, MessageType},