implement

internal/postgres/error.go

@@ -0,0 +1,11 @@
+package postgres
+
+type Error string
+
+func (err Error) Error() string { return string(err) }
+
+const (
+	ErrVersionIDMismatch Error = "version ids does not match"
+	ErrNoMessage         Error = "no messages in queue"
+	ErrNotImplemented    Error = "not implemented"
+)