Initialise chat index table

src/sqlite/mod.rs

@@ -25,6 +25,7 @@ pub async fn load_template(sqlite_handle: &SqlitePool) -> sqlx::Result<SqliteQue
         include_str!("notification_preferences.sql"),
         include_str!("external_servers_privacy_preferences.sql"),
         include_str!("external_servers_preferences.sql"),
+        include_str!("chat_index.sql"),
     )).execute(sqlite_handle).await
 }