diff --git a/pkg/errors/errors.go b/pkg/errors/errors.go
index f8dc228..686e53a 100644
--- a/pkg/errors/errors.go
+++ b/pkg/errors/errors.go
@@ -15,4 +15,7 @@ var (
 	ErrValueTooLong            = errors.New("cookie value too long")
 	ErrInvalidValue            = errors.New("invalid cookie value")
 	ErrInvalidSigningAlgorithm = errors.New("invalid signing algorithm")
+	ErrValidToken              = errors.New("valid token")
+	ErrInvalidUserData         = errors.New("invalid user data")
+	ErrDuplicateEntry          = errors.New("duplicate entry; unique constraint failed")
 )