The answer
Identify them in the edge cases section. For example: two signups with the same email at the same time. Document that the unique index on email ensures one fails with a duplicate key error.
What Is Low-Level Design (LLD)? With Example
How do you handle race conditions in LLD?
More FAQs in What Is Low-Level Design (LLD)? With Example
The detailed design of a system. It contains database schemas, API contracts, internal logic, error cases, and edge cases. A developer should be able to code from the LLD without asking more questions.
Database schemas (collections, fields, types, indexes, relationships), API contracts (endpoints, methods, request/response shapes, status codes), internal logic, error cases, and edge cases.
HLD is the big picture (components, communication, tech stack). LLD is the detail (schemas, endpoints, logic, errors). HLD settles architecture; LLD settles implementation.
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