The startup-race hardening added a global unique index on lists.name, but
duplicate list names are legitimate and the index broke 8 Worker tests that
seed same-named lists. The seeder race is already handled by the atomic
INSERT...WHERE NOT EXISTS, so the index is redundant. Keep the de-dup migration
step, remove the unique index from config, migration and model snapshot.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
f5d165baae