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You are designing a mobile application for tracking fitness goals and progress. You plan to use Firestore as the primary backend database for user data storage and authentication. You want to efficiently query the data on various parameters such as distance, time, and calories burned. During the testing phase, you discovered that costs are much higher than anticipated, but the query response times are within the SLA. You want to follow Google-recommended practices. You need the database to be performant and highly available while you keep costs low. What should you do?