Add oauth token failure model and notification

This will allow me to mark when an oauth token fails and surface it to
the user so that they can re-up on their auth token.

dberrors/notification.bob.go

@@ -0,0 +1,17 @@
+// Code generated by BobGen psql v0.41.1. DO NOT EDIT.
+// This file is meant to be re-generated in place and/or deleted at any time.
+
+package dberrors
+
+var NotificationErrors = &notificationErrors{
+	ErrUniqueNotificationPkey: &UniqueConstraintError{
+		schema:  "",
+		table:   "notification",
+		columns: []string{"id"},
+		s:       "notification_pkey",
+	},
+}
+
+type notificationErrors struct {
+	ErrUniqueNotificationPkey *UniqueConstraintError
+}