The answer
Usually the system design explains the database choice and its tradeoffs. A PRD may include a technology constraint when a customer, integration, or organization requires it.
How does a system-design document differ from a PRD?
Should database technology be specified in the PRD or system design?
More FAQs in How does a system-design document differ from a PRD?
Assign the requirement an identifier, then reference it beside the responsible components, data flows, and permissions. Reviewers can follow that chain to detect missing implementation decisions.
Resolve the product behavior first with the responsible stakeholder, then revise the technical design. Letting competing documents stand encourages developers and AI assistants to implement different expectations.
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