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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.
If you're doing something like passwordless and usernameless, then your locally stored credential has an ID that was generated during registration. This is sent as part of the authentication request, and the relying party has a way of association which credential ID's are linked to which user accounts. The credential portion is talked about in section 5.1 of the https://w3c.github.io/webauthn docs.
The "passwordless" libraries/framework they've provided so far, linked to from these announcements, don't seem to be open source but I've raised this with them on GitHub.