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Remove Messages & Experiments feature, for more detail, please check this post:
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Upgrade offline tracking storage with SQLite, it will:
- Reduce crashes caused by race conditions for serializing data
- Greatly improve the performance for intensive tracking needs
- Fix the memory leaks
- Be a non-functional change and transparent to all users, the new version will take care of migrating data from the NSKeyedArchiver files to SQLite DBs, no data will be lost.