diff --git a/Lite.Tests/AnomalyDetectorTests.cs b/Lite.Tests/AnomalyDetectorTests.cs
index a66a8eb..1efdab9 100644
--- a/Lite.Tests/AnomalyDetectorTests.cs
+++ b/Lite.Tests/AnomalyDetectorTests.cs
@@ -15,7 +15,6 @@ namespace PerformanceMonitorLite.Tests;
 /// methods (batch requests, sessions, query duration, memory), per-metric thresholds,
 /// and baseline context metadata.
 /// </summary>
-[Collection(BaselineProviderCollection.Name)]
 public class AnomalyDetectorTests : IDisposable
 {
     private readonly string _tempDir;
diff --git a/Lite.Tests/BaselineProviderCollection.cs b/Lite.Tests/BaselineProviderCollection.cs
deleted file mode 100644
index aa299ec..0000000
--- a/Lite.Tests/BaselineProviderCollection.cs
+++ /dev/null
@@ -1,13 +0,0 @@
-using Xunit;
-
-namespace PerformanceMonitorLite.Tests;
-
-/* BaselineProviderTests and AnomalyDetectorTests both mutate the static
-   BaselineProvider.CacheTtl field. With assembly-level parallelization
-   enabled, those two classes must share a collection so they don't run
-   concurrently and stomp on each other's TTL writes. */
-[CollectionDefinition(Name, DisableParallelization = true)]
-public class BaselineProviderCollection
-{
-    public const string Name = "BaselineProvider";
-}
diff --git a/Lite.Tests/BaselineProviderTests.cs b/Lite.Tests/BaselineProviderTests.cs
index 2746aba..cdf9cad 100644
--- a/Lite.Tests/BaselineProviderTests.cs
+++ b/Lite.Tests/BaselineProviderTests.cs
@@ -13,7 +13,6 @@ namespace PerformanceMonitorLite.Tests;
 /// Tests for BaselineProvider: time-bucketed baseline computation, bucket collapse
 /// with hysteresis, restart poisoning exclusion, and division-by-zero handling.
 /// </summary>
-[Collection(BaselineProviderCollection.Name)]
 public class BaselineProviderTests : IDisposable
 {
     private readonly string _tempDir;
diff --git a/Lite.Tests/FinOpsDuckDbFixture.cs b/Lite.Tests/FinOpsDuckDbFixture.cs
deleted file mode 100644
index 1afc3d4..0000000
--- a/Lite.Tests/FinOpsDuckDbFixture.cs
+++ /dev/null
@@ -1,35 +0,0 @@
-using System;
-using System.IO;
-using PerformanceMonitorLite.Database;
-
-namespace PerformanceMonitorLite.Tests;
-
-/* Shared DuckDB fixture for FinOpsTests. xUnit instantiates this once per
-   test class (via IClassFixture<>), so all tests in the class share a
-   single DuckDB file. Each test seeder calls ClearTestDataAsync first
-   (via the *Async helpers in TestDataSeeder), so cross-test pollution
-   is prevented without paying the schema-init cost on every test. */
-public sealed class FinOpsDuckDbFixture : IDisposable
-{
-    public string TempDir { get; }
-    public string DbPath { get; }
-    public DuckDbInitializer DuckDb { get; }
-
-    public FinOpsDuckDbFixture()
-    {
-        TempDir = Path.Combine(Path.GetTempPath(), "FinOpsTests_" + Guid.NewGuid().ToString("N")[..8]);
-        Directory.CreateDirectory(TempDir);
-        DbPath = Path.Combine(TempDir, "test.duckdb");
-        DuckDb = new DuckDbInitializer(DbPath);
-    }
-
-    public void Dispose()
-    {
-        try
-        {
-            if (Directory.Exists(TempDir))
-                Directory.Delete(TempDir, recursive: true);
-        }
-        catch { /* Best-effort cleanup */ }
-    }
-}
diff --git a/Lite.Tests/FinOpsTests.cs b/Lite.Tests/FinOpsTests.cs
index 00bc2c4..60dc3af 100644
--- a/Lite.Tests/FinOpsTests.cs
+++ b/Lite.Tests/FinOpsTests.cs
@@ -15,13 +15,28 @@ namespace PerformanceMonitorLite.Tests;
 /// Each test seeds a specific server profile into DuckDB, runs the recommendation or
 /// scoring engine, and validates the output (categories, findings, severity, savings).
 /// </summary>
-public class FinOpsTests : IClassFixture<FinOpsDuckDbFixture>
+public class FinOpsTests : IDisposable
 {
+    private readonly string _tempDir;
+    private readonly string _dbPath;
     private readonly DuckDbInitializer _duckDb;
 
-    public FinOpsTests(FinOpsDuckDbFixture fixture)
+    public FinOpsTests()
     {
-        _duckDb = fixture.DuckDb;
+        _tempDir = Path.Combine(Path.GetTempPath(), "FinOpsTests_" + Guid.NewGuid().ToString("N")[..8]);
+        Directory.CreateDirectory(_tempDir);
+        _dbPath = Path.Combine(_tempDir, "test.duckdb");
+        _duckDb = new DuckDbInitializer(_dbPath);
+    }
+
+    public void Dispose()
+    {
+        try
+        {
+            if (Directory.Exists(_tempDir))
+                Directory.Delete(_tempDir, recursive: true);
+        }
+        catch { /* Best-effort cleanup */ }
     }
 
     /* ── Over-Provisioned Enterprise ── */
diff --git a/Lite.Tests/Lite.Tests.csproj b/Lite.Tests/Lite.Tests.csproj
index 9c973a7..a1c9583 100644
--- a/Lite.Tests/Lite.Tests.csproj
+++ b/Lite.Tests/Lite.Tests.csproj
@@ -20,8 +20,4 @@
   <ItemGroup>
     <ProjectReference Include="..\Lite\PerformanceMonitorLite.csproj" />
   </ItemGroup>
-
-  <ItemGroup>
-    <None Include="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
-  </ItemGroup>
 </Project>
diff --git a/Lite.Tests/xunit.runner.json b/Lite.Tests/xunit.runner.json
deleted file mode 100644
index 078ec50..0000000
--- a/Lite.Tests/xunit.runner.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "$schema": "https://xunit.net/schema/v3/xunit.runner.schema.json",
-  "parallelizeAssembly": true,
-  "parallelizeTestCollections": true,
-  "maxParallelThreads": -1,
-  "parallelAlgorithm": "aggressive"
-}