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Druid Sql Api might be helpful for you. References: https://druid.apache.org/docs/latest/querying/sql-api.html#submit-a-query

I hadn't realised this API supported parameterised queries like that. This would definitely be the most sustainable solution. Thank you 🙂

seconding the recommendation; from C# I think your best bet is use the HTTP API directly. it's pretty straightforward