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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
It's not a silver bullet of course. Discord, for instance, just 'anonymises' message history by renaming your account to Deleted User. But most people's message history is enough to deanonymise them, making that completely null and void. If you ask for your messages to actually be deleted they will refuse your request.
I published a tool[1] on GitHub for deleting message history in the most efficient way I could find. Yet users of the tool sometimes get their accounts banned because Discord's TOS prohibits unauthorised use of their API.
Discord is either tone-deaf to common privacy concerns or they're completely conscious of them and don't want people to clear their message history.
[1] https://github.com/adversarialtools/discord-delete