-
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.
This, along with the proposed usage of SQL Server Express, suggests to me that OP nor the OPs company is committed to one db engine. SQLite's SQL syntax is similar enough to port skills and you can find a nice GUI for it, like https://sqlitestudio.pl/
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.