Keep negotiated account prices outside shared quote caches
A shared cache returns one customer's negotiated rate to another account requesting the same product list.
- Focused work estimate
- 3h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Caching · Tenant isolation
Estimated field mix
- Security50%
- Backend50%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional parts supplier combines contract prices with promotions. Sales needs repeatable quotes when rules change during checkout.
Setup prerequisites
- Create synthetic products and integer minor-unit prices.
- Implement a small local quote API.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Bind cache identity to organization, account and frozen price version.
- Authorize before cache lookup.
- Never cache an authorization failure as a valid quote.
Implementation constraints
- Include all price-affecting inputs in canonical cache keys.
Verification to include
- Quote identical carts for two negotiated-price accounts.
- Attempt cross-account access and inspect cache hits and response fields.
Deliverables
- Scoped cache key and isolation regression
Rollout and recovery
Invalidate the affected namespace before enabling the new key format.
Value of the work
For the engineer: Practice deterministic rule evaluation, revision control and bounded execution.
For the team: Review explainable commercial rules without trusting opaque price changes.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.