update endpoints

backend/rooms.py

@@ -201,4 +201,34 @@ def get_room(room_id, user_id):
         "members": [dict(member) for member in members],
         "events": [dict(event) for event in events]
     }
-    
+
+def get_room_members(room_id):
+
+    return fetch_all(
+        """
+        SELECT 
+            users.id,
+            users.username
+        FROM room_members
+        JOIN users
+        ON users.id = room_members.user_id
+        WHERE room_members.room_id = ?
+        """,
+        (room_id,)
+    )
+
+def leave_room(room_id, user_id):
+
+    from database import execute
+
+    execute(
+        """
+        DELETE FROM room_members
+        WHERE room_id = ?
+        AND user_id = ?
+        """,
+        (
+            room_id,
+            user_id
+        )
+    )