use switch to ruma and remove unneeded code

migrations/20220423204756_add_user.sql

@@ -3,7 +3,7 @@ CREATE TABLE users(
     uuid TEXT PRIMARY KEY NOT NULL,
     user_id CHAR(255) NOT NULL,
     display_name TEXT NOT NULL,
-    password TEXT NOT NULL
+    password_hash TEXT NOT NULL
 );
 
 CREATE INDEX user_id_index ON users (user_id);