diff --git a/src/Mocha.Core/Storage/Jaeger/IJaegerSpanReader.cs b/src/Mocha.Core/Storage/Jaeger/IJaegerSpanReader.cs
index 24c8c43..7ae6cad 100644
--- a/src/Mocha.Core/Storage/Jaeger/IJaegerSpanReader.cs
+++ b/src/Mocha.Core/Storage/Jaeger/IJaegerSpanReader.cs
@@ -7,11 +7,11 @@ namespace Mocha.Core.Storage.Jaeger;
 
 public interface IJaegerSpanReader
 {
-    Task<string[]> GetServicesAsync();
+    Task<IEnumerable<string>> GetServicesAsync();
 
-    Task<string[]> GetOperationsAsync(string serviceName);
+    Task<IEnumerable<string>> GetOperationsAsync(string serviceName);
 
-    Task<JaegerTrace[]> FindTracesAsync(JaegerTraceQueryParameters query);
+    Task<IEnumerable<JaegerTrace>> FindTracesAsync(JaegerTraceQueryParameters query);
 
-    Task<JaegerTrace[]> FindTracesAsync(string[] traceIDs, ulong? startTimeMinUnixNano = null, ulong? startTimeMaxUnixNano = null);
+    Task<IEnumerable<JaegerTrace>> FindTracesAsync(string[] traceIDs, ulong? startTimeMinUnixNano = null, ulong? startTimeMaxUnixNano = null);
 }
diff --git a/src/Mocha.Query.Jaeger/Controllers/TraceController.cs b/src/Mocha.Query.Jaeger/Controllers/TraceController.cs
index 6ad6ada..6c4c943 100644
--- a/src/Mocha.Query.Jaeger/Controllers/TraceController.cs
+++ b/src/Mocha.Query.Jaeger/Controllers/TraceController.cs
@@ -12,19 +12,19 @@ namespace Mocha.Query.Jaeger.Controllers
     public class TraceController(IJaegerSpanReader spanReader) : Controller
     {
         [HttpGet("services")]
-        public async Task<JaegerResponse<string[]>> GetSeries()
+        public async Task<JaegerResponse<IEnumerable<string>>> GetSeries()
         {
             return new(await spanReader.GetServicesAsync());
         }
 
         [HttpGet("services/{serviceName}/operations")]
-        public async Task<JaegerResponse<string[]>> GetOperations(string serviceName)
+        public async Task<JaegerResponse<IEnumerable<string>>> GetOperations(string serviceName)
         {
             return new(await spanReader.GetOperationsAsync(serviceName));
         }
 
         [HttpGet("traces")]
-        public async Task<JaegerResponse<JaegerTrace[]>> FindTraces([FromQuery] FindTracesRequest request)
+        public async Task<JaegerResponse<IEnumerable<JaegerTrace>>> FindTraces([FromQuery] FindTracesRequest request)
         {
             static ulong? ParseAsNanoseconds(string? input)
             {
@@ -71,7 +71,7 @@ public async Task<JaegerResponse<JaegerTrace[]>> FindTraces([FromQuery] FindTrac
                 startTimeMax = now;
             }
 
-            JaegerTrace[] traces;
+            IEnumerable<JaegerTrace> traces;
 
             if (request.TraceID?.Any() ?? false)
             {
@@ -99,26 +99,26 @@ public async Task<JaegerResponse<JaegerTrace[]>> FindTraces([FromQuery] FindTrac
             }
 
             JaegerResponseError? error = null;
-            if (traces.Length == 0)
+            if (traces.Any() is false)
             {
                 error = new JaegerResponseError { Code = (int)HttpStatusCode.NotFound, Message = "trace not found" };
             }
 
-            return new JaegerResponse<JaegerTrace[]>(traces) { Error = error };
+            return new JaegerResponse<IEnumerable<JaegerTrace>>(traces) { Error = error };
         }
 
         [HttpGet("traces/{traceID}")]
-        public async Task<JaegerResponse<JaegerTrace[]>> GetTrace(string traceID)
+        public async Task<JaegerResponse<IEnumerable<JaegerTrace>>> GetTrace(string traceID)
         {
             var traces = await spanReader.FindTracesAsync([traceID]);
 
             JaegerResponseError? error = null;
-            if (traces.Length == 0)
+            if (traces.Any() is false)
             {
                 error = new JaegerResponseError { Code = (int)HttpStatusCode.NotFound, Message = "trace not found" };
             }
 
-            return new JaegerResponse<JaegerTrace[]>(traces) { Error = error };
+            return new JaegerResponse<IEnumerable<JaegerTrace>>(traces) { Error = error };
         }
     }
 }
diff --git a/src/Mocha.Storage/EntityFrameworkCore/Jaeger/EFJaegerSpanReader.cs b/src/Mocha.Storage/EntityFrameworkCore/Jaeger/EFJaegerSpanReader.cs
index 1b87190..3e03436 100644
--- a/src/Mocha.Storage/EntityFrameworkCore/Jaeger/EFJaegerSpanReader.cs
+++ b/src/Mocha.Storage/EntityFrameworkCore/Jaeger/EFJaegerSpanReader.cs
@@ -10,25 +10,25 @@ namespace Mocha.Storage.EntityFrameworkCore.Jaeger;
 
 internal class EFJaegerSpanReader(IDbContextFactory<MochaContext> contextFactory) : IJaegerSpanReader
 {
-    public async Task<string[]> GetServicesAsync()
+    public async Task<IEnumerable<string>> GetServicesAsync()
     {
         await using var context = await contextFactory.CreateDbContextAsync();
-        var services = await context.Spans.Select(s => s.ServiceName).Distinct().ToArrayAsync();
+        var services = await context.Spans.Select(s => s.ServiceName).Distinct().ToListAsync();
         return services;
     }
 
-    public async Task<string[]> GetOperationsAsync(string serviceName)
+    public async Task<IEnumerable<string>> GetOperationsAsync(string serviceName)
     {
         await using var context = await contextFactory.CreateDbContextAsync();
         var operations = await context.Spans
             .Where(s => s.ServiceName == serviceName)
             .Select(s => s.SpanName)
             .Distinct()
-            .ToArrayAsync();
+            .ToListAsync();
         return operations;
     }
 
-    public async Task<JaegerTrace[]> FindTracesAsync(JaegerTraceQueryParameters query)
+    public async Task<IEnumerable<JaegerTrace>> FindTracesAsync(JaegerTraceQueryParameters query)
     {
         await using var context = await contextFactory.CreateDbContextAsync();
         var queryableSpans = context.Spans.AsQueryable();
@@ -92,7 +92,7 @@ join spanId in spanIds on span.SpanId equals spanId
         return await QueryJaegerTracesAsync(queryableSpans, context);
     }
 
-    public async Task<JaegerTrace[]> FindTracesAsync(
+    public async Task<IEnumerable<JaegerTrace>> FindTracesAsync(
         string[]? traceIDs,
         ulong? startTimeUnixNano,
         ulong? endTimeUnixNano)
@@ -119,29 +119,29 @@ public async Task<JaegerTrace[]> FindTracesAsync(
         return await QueryJaegerTracesAsync(queryableSpans, context);
     }
 
-    private static async Task<JaegerTrace[]> QueryJaegerTracesAsync(
+    private static async Task<IEnumerable<JaegerTrace>> QueryJaegerTracesAsync(
         IQueryable<EFSpan> queryableSpans,
         MochaContext context)
     {
-        var spans = await queryableSpans.ToArrayAsync();
+        var spans = await queryableSpans.ToListAsync();
 
         var spanIds = spans.Select(s => s.SpanId).ToArray();
 
         var spanAttributes = await context.SpanAttributes
             .Where(a => spanIds.Contains(a.SpanId))
-            .ToArrayAsync();
+            .ToListAsync();
 
         var resourceAttributes = await context.ResourceAttributes
             .Where(a => spanIds.Contains(a.SpanId))
-            .ToArrayAsync();
+            .ToListAsync();
 
         var spanEvents = await context.SpanEvents
             .Where(e => spanIds.Contains(e.SpanId))
-            .ToArrayAsync();
+            .ToListAsync();
 
         var spanEventAttributes = await context.SpanEventAttributes
             .Where(a => spanIds.Contains(a.SpanId))
-            .ToArrayAsync();
+            .ToListAsync();
 
         var jaegerTraces = spans.ToJaegerTraces(
             spanAttributes, resourceAttributes, spanEvents, spanEventAttributes).ToArray();
diff --git a/tests/Mocha.Storage.Tests/EntityFrameworkCore/EFJaegerSpanReaderTests.cs b/tests/Mocha.Storage.Tests/EntityFrameworkCore/EFJaegerSpanReaderTests.cs
index 5b79e17..1b804ae 100644
--- a/tests/Mocha.Storage.Tests/EntityFrameworkCore/EFJaegerSpanReaderTests.cs
+++ b/tests/Mocha.Storage.Tests/EntityFrameworkCore/EFJaegerSpanReaderTests.cs
@@ -364,7 +364,7 @@ public async Task FindTracesAsync_TraceID()
             now.AddMinutes(-2).ToUnixTimeNanoseconds(),
             now.AddMinutes(2).ToUnixTimeNanoseconds());
         Assert.Single(traces);
-        Assert.Equal("TraceId1", traces[0].TraceID);
+        Assert.Equal("TraceId1", traces.First().TraceID);
     }
 
     public void Dispose()