Revert "Merge get_user into authenticate_user, it was only doing one db call"

ups, das war ja doch von mehr verwendet...
This reverts commit 0337a90f15.

app/services/auth.py

@@ -26,8 +26,14 @@ def verify_password(plain_password, hashed_password):
 def get_password_hash(password):
     return password_hash.hash(password)
 
-def authenticate_user(db, username: str, password: str):
+def get_user(db, username: str):
     user = db.exec(select(UserDB).where(UserDB.name == username)).first()
+    if user is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Username not found in get_user, this shouldn't happen")
+    return user
+
+def authenticate_user(db, username: str, password: str):
+    user = get_user(db, username)
     if not user:
         return False
     if not verify_password(password, user.passwordhash):