Hotfix to scripts/migrations/2026-05-24-rename-admin-email.js (shipped 2026-05-24 in pick-a-name PR #21). Script crashed on first invocation with 'TypeError: Cannot read properties of undefined (reading length)' at line 44. Root cause: architect designed against @vercel/postgres return shape { rows, rowCount } but the script uses @neondatabase/serverless's neon() tagged template which returns the rows array directly. AGENTS.md Gotcha #1 (two SQL clients in parallel) is exactly this kind of cross-contamination. Fix: drop the { rows: x } destructuring in all 3 sites + add a 4-line why comment block above the first site so the next migration author doesn't repeat. Verified hand-run against prod Neon DB: migrated 3 users (admin id=1, alice id=5, bob id=6) from @tcgvault.com to @deckhearth.com; idempotent re-run prints 'Nothing to migrate.' No data risk on the original crash — script exited at line 44 before reaching the UPDATE at line 54. PR #21 operator action item now complete in prod. Surfaces a P3 follow-up: add-neon-return-shape-rule (or fold into single-sql-client). All CI green: lint 128 baseline, vitest 21/21, Playwright smoke 3/3 in 1m2s, forbidden-cors-headers pass, forbidden-endpoints pass. PR #24, commit 98406fa.
