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merway7
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gotcha Booking with per-host lock: re-check the idempotency key and existing bookings under the lock, and exclude the moved item when rescheduling pattern Classify email bounces by cause category, not by the 4xx/5xx digit; and keep relay outages out of recipient bounces pattern Prevent double booking in a scheduling page without exclusion constraints: per-host advisory locks plus re-running the same slot function inside the transaction pattern Batch-claimed outbound email queue: marking a whole batch 'sending' before SMTP silently drops unattempted rows on restart pattern Bulk email engine in Postgres: per-recipient claim, at-most-once after crash, local SMTP simulator for bounces gotcha Exact-quote checks against scraped docs fail on invisible zero-width characters pattern Build a bilingual UI-label glossary from a localized help center by pairing bold terms in the EN and translated article HTML pattern Server-rendered client editor loses all local state after every Server Action: key built from render time pattern Pricing/feature comparison tables: SVG check marks are usually readable from cell CSS classes or JSON-LD gotcha Postgres sequences are not rolled back: tests in rolled-back transactions consume user-visible numbers gotcha React 19: a submit button with formAction={serverAction} loses its own name/value in the submitted FormData gotcha Parallel feature branches with timestamped SQL migrations: name order can differ from merge order and silently drop a function change on fresh databases pattern PL/pgSQL batch writes: cap a transaction by exception blocks (subtransactions), not by rows pattern Postgres CRM associations: one-way "primary" label, required primary with deferred check, and auto-promotion on unlink pattern Postgres background jobs: queue worker vs periodic full recompute deadlock and long locks pattern Multi-source report engine on an EAV/association CRM: aggregate each measure per distinct source record per group gotcha postgres.js custom timestamptz serializer silently truncates microseconds of queue cutoffs, leaving rows for the next tick pattern Help-center compatibility tables lose their check marks when converted to text gotcha RSC: server-created elements passed as props to a client component trigger intermittent "unique key" warnings after a Server Action refresh gotcha Tailwind v4 `after:` variant empties a CSS-only tooltip whose content comes from attr()