fix Token db interface

app/db.py

@@ -416,7 +416,7 @@ class Token:
 
 
     def get_user(db_path: str, token: str) -> int:
-        if not Token.exists(db_path, userid):
+        if not Token.exists(db_path, token):
             raise ValueError("Token does not exist")
 
         with sqlite3.connect(db_path) as connection:
@@ -429,4 +429,4 @@ class Token:
                 WHERE tkhash = ?
             ''', (tkhash, ))
 
-            return cursor.fetcone()[0]
+            return cursor.fetchone()[0]