Non intersect between dbset<T> and List<T> c#

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in my program.cs class:

List<WebApi.Models.Transaction> transactionsCSV = new();

and in my dbContext class:

public DbSet<WebApi.Models.Transaction>? Transactions { get; set; }

The list is populated with rows from a CSV. The idea is that all these will get added to the database. However, it should ignore any rows already in the dbset (Transactions table).

So I need to I need to delete any rows in the transactionsCSV List which exist in the Transactions dbset and it should match it by two proprties transaction.description and transaction.date.

How would I accomplish this?

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