Choose isolation per layer and define the trusted tenant context. Run a complete row-level-security exercise with read, write and connection-reset checks, then inspect the cache, retrieval, job and support paths that database policies cannot protect.
30 MIN · PLUS
The mental model interviewers reward starts one level deeper than the definition: what the concept buys you, what it costs, and the single trade-off that decides when to reach for it.
Work the concrete example end to end, then name the failure mode most candidates miss — that is the signal that you have used this in production, not just read about it.
a free account unlocks the core curriculum tier · no card
