Whenever you're ready, walk me through how you'd approach this.
MySQL vs MongoDB: which would you prefer and why? Then walk through all tables, attributes and relationships of your MySQL project and write the queries behind a feature, and explain the indexes you used.
Asked in the Final round stage. Treat the project as an end-to-end ML system data layer, and explain how schema choices support reliable feature retrieval, logging, and downstream model workflows. Focus on practical design decisions rather than generic database definitions.