diff --git a/.coderabbit.yaml b/.coderabbit.yaml
index 3d242d98..76495cf4 100644
--- a/.coderabbit.yaml
+++ b/.coderabbit.yaml
@@ -40,7 +40,6 @@ reviews:
     - "!**/perf/**"        # Exclude performance tests
     - "!**/quantower/**"   # Exclude root quantower directory
     - "!**/Mocks/**"       # Exclude Mocks
-    - "!**/test_collection_expr.cs" # Exclude scratch files
     - "!**/*.so"           # Exclude Shared Objects
     - "!**/*.dylib"        # Exclude Dynamic Libraries
     - "!**/*.log"          # Exclude Log files
diff --git a/.github/workflows/Publish.yml b/.github/workflows/Publish.yml
index 8c985075..394b2893 100644
--- a/.github/workflows/Publish.yml
+++ b/.github/workflows/Publish.yml
@@ -177,7 +177,7 @@ jobs:
           path: .qodana/code-coverage
 
       - name: Qodana Scan
-        uses: JetBrains/qodana-action@v2024.3.4
+        uses: JetBrains/qodana-action@b60a4b95388c6e8647571e16f3984e9d0da499e1 # v2024.3.4
         env:
           QODANA_TOKEN: ${{ secrets.QODANA_TOKEN }}
         with:
@@ -201,7 +201,7 @@ jobs:
           path: coverage
 
       - name: Upload to Codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@1e68e06f1dbfde0f4cefc87efeba9e4643565303 # v5.1.2
         with:
           directory: coverage
           verbose: true
@@ -262,7 +262,7 @@ jobs:
           dotnet-version: ${{ env.DOTNET_VERSION }}
 
       - name: Install Snyk CLI
-        uses: snyk/actions/setup@master
+        uses: snyk/actions/setup@806182742461562b67788a64410098c9d9b96adb # master
 
       - name: Restore dependencies
         run: dotnet restore
@@ -331,14 +331,14 @@ jobs:
           dotnet-version: ${{ env.DOTNET_VERSION }}
 
       - name: Install GitVersion
-        uses: gittools/actions/gitversion/setup@v3.1.11
+        uses: gittools/actions/gitversion/setup@4934e803a6603a118d0979e2c608a113d077b946 # v3.1.11
         with:
           versionSpec: '6.x'
           includePrerelease: true
 
       - name: Determine Version
         id: gitversion
-        uses: gittools/actions/gitversion/execute@v3.1.11
+        uses: gittools/actions/gitversion/execute@9393967d73967d6a599b514b1b31278f99e82110 # v3.1.11
         with:
           useConfigFile: true
           updateAssemblyInfo: false
diff --git a/test_collection_expr.cs b/test_collection_expr.cs
deleted file mode 100644
index 72d08685..00000000
--- a/test_collection_expr.cs
+++ /dev/null
@@ -1,11 +0,0 @@
-using System;
-using System.Collections.Generic;
-using QuanTAlib;
-
-public class Test
-{
-    public TSeries Create()
-    {
-        return [];
-    }
-}
diff --git a/test_record_struct.cs b/test_record_struct.cs
deleted file mode 100644
index dcaf5c5a..00000000
--- a/test_record_struct.cs
+++ /dev/null
@@ -1,23 +0,0 @@
-using System;
-
-namespace QuanTAlib;
-
-public class RecordStructTest
-{
-    private record struct State(double Val, bool Flag);
-
-    public static void Run()
-    {
-        var s1 = new State(1.0, true);
-        var s2 = new State(1.0, true);
-        var s3 = new State(2.0, false);
-
-        Console.WriteLine($"s1 == s2: {s1 == s2}"); // Should be True
-        Console.WriteLine($"s1 == s3: {s1 == s3}"); // Should be False
-        Console.WriteLine($"s1 equals s2: {s1.Equals(s2)}"); // Should be True
-        
-        // Verify mutability
-        s1.Val = 3.0;
-        Console.WriteLine($"s1 modified: {s1.Val}");
-    }
-}