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About 2 minutes task, you define core entities that your apis use and the system will persist in a Data Model.
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Write it in shape of bullet list and Don’t forget to tell the interviewer that this list is a draft and will be updated as we go.
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Don’t list the entire data model (columns and fields of the entities) this will be done on the High-level design phase. As you design your system you will discover new entities and relationships you didn’t discover before.
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Start simple and update as you go
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Aim to choose good names for your entities