Cache key missing tenant id

Users from tenant B report seeing data belonging to users from tenant A, which happens if both users have the same user ID in the database.

Initial failing signalvisible.test.mjs fails on cross-tenant fetchExpected behavior: Tenant B receives its own cached value for user 1. · actual behavior: Tenant B receives tenant A's cached value for user 1.

Progress

1Reproduce the bugRun checks

2Edit the fixOpen

3Pass checksOpen

4Submit fixOpen

Reproduction Steps

Run npm test.
Compare requests for two tenants that share the same user ID.
Trace how request identity becomes a cache lookup.
Preserve isolation while keeping repeat lookups cacheable.

Focus Mode

Start

src/index.js

Likely area

src/index.js

Challenge Coach

Hints reveal broad direction first, then narrow toward the suspect path without showing hidden tests or exact solution code.

TopicCaching & Performance

DifficultyHard

Est. time20 min

Workspacepreparing

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Evidence Map

Failing signal loaded from challenge API
Workspace files loaded from workspace API
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workspace

Outputread-onlyready$ prepare workspace

Preparing workspace