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In case of only userId and contentId, the progress is captured only for that content
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Handling Collection Data types in DB:
With normal collection types, the map values gets distributed to multiple sstables with append, which might lead to read latency issues
To the handle the scenario, will consider the frozen collection types, which will helpful in tombstone and avoid multiple sstable reads
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V1 vs V2 APIs:
We need to continue supporting the current APIs(v1) before deprecate and delete. So, it requires to work with both the APIs with backward compatibility.
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