update

model/errors.go

@@ -0,0 +1,12 @@
+package model
+
+import "errors"
+
+var (
+	ErrNotFound      = errors.New("data not found")
+	ErrInvalidAuth   = errors.New("invalid authentication")
+	ErrNotAuthorized = errors.New("not authorized")
+	ErrExpired       = errors.New("access expired")
+	ErrNotAvailable  = errors.New("functionality not available")
+	ErrValidation    = errors.New("validation error")
+)