The plain-English version
Rules determining how concurrent transactions observe and interfere with one another's changes.
Why it matters
It affects whether multi-step decisions remain valid when other users act at the same time.
Let’s make it click
Two reservation requests compete for the last available seat.
Vibe Bro’s heads-up
An application-level read-then-write sequence is not automatically safe; choose appropriate constraints, locking, or retry behavior for the intended invariant.
The docs behind it
Documentation links checked .
Editorial review · October 28, 2026
Supported: Isolation governs concurrent observations; constraints, locking, and retries depend on the required invariant.