The relative-date regex used character classes [+|-] and [y|m|w|d],
which mistakenly treat | as a literal member rather than alternation.
As a result a value like added:2000|2001 (as a user might type expecting
| to mean "or") captured | as the relative-date unit and crashed with
an uncaught KeyError in Period.parse instead of raising the documented
InvalidQueryArgumentValueError.
Remove the stray | from both character classes so malformed date strings
fall through to the normal invalid-date error path.
Co-Authored-By: Claude <noreply@anthropic.com>
