text: CREATE TABLE [Users] (
  	[user_id] VARCHAR(100),
  	[username] VARCHAR(20) PRIMARY KEY NOT NULL,
  	[displayname] VARCHAR(20)  NULL,
  	[pub_key] VARCHAR(100) NOT NULL,
    [credential_id] VARCHAR(100),
    [sign_count] INT,
    [icon_url] VARCHAR(20),
    [rp_id] VARCHAR(20)
  );
  
  CREATE TABLE [PublicKeyCredentialCreationOptions] (
      [rp_name] VARCHAR(20),
      [rp_id] VARCHAR(20),
      [user_id] VARCHAR(100) PRIMARY KEY NOT NULL,
      [user_displayname] VARCHAR(20),
      [user_username] VARCHAR(20),
      [challenge] VARCHAR(100)
  );
  