The slug regex stripped everything that is not a-z0-9, so Chinese or
punctuation-only titles produced an empty slug (stored as ""), which
broke the unique index and article URLs.
generateSlug now keeps ASCII word characters and returns "" when the
title yields no URL-safe ASCII (e.g. CJK or punctuation only). Both the
create and update handlers fall back to a "post-<id>" slug in that case;
on create a temporary token-based placeholder is refined to post-<id>
once the row exists.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
kevinandClaude Fable 5
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