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src/Signals/StellaOps.Signals/Persistence/IUnknownsRepository.cs

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+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using StellaOps.Signals.Models;
+
+namespace StellaOps.Signals.Persistence;
+
+public interface IUnknownsRepository
+{
+    Task UpsertAsync(string subjectKey, IEnumerable<UnknownSymbolDocument> items, CancellationToken cancellationToken);
+    Task<IReadOnlyList<UnknownSymbolDocument>> GetBySubjectAsync(string subjectKey, CancellationToken cancellationToken);
+    Task<int> CountBySubjectAsync(string subjectKey, CancellationToken cancellationToken);
+}