- Update all base.sql fixtures to include token_hash/token_prefix columns
- Keep plaintext token for webhook tokens (needed for URL reconstruction)
- Restore get_token_by_prefix to query DB for webhook tokens
- Fix down migration to delete NULL-token rows before restoring NOT NULL
- Update parser fixture standalone schema
- Update EE dedicated_worker_ee.rs to use token_hash/token_prefix
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>