From ac939fcfad9e70df7cd0bf70b459850c5608f116 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Mon, 27 Apr 2026 13:15:04 -0400
Subject: [PATCH 01/39] feat(cpp/client, py/client, csharp/client): DH-22472,
 DH-22473, DH-22475: Github Actions to build (cpp-client, python, csharp) on
 (Ubuntu 24.04, Windows)

---
 .../clients-cpp-python-ubuntu2404.yml         | 262 ++++++++++++++++++
 .../workflows/clients-cpp-python-windows.yml  | 255 +++++++++++++++++
 .github/workflows/clients-csharp.yml          |  58 ++++
 .github/workflows/dhc-version.yml             |  39 +++
 cpp-client/deephaven/CMakeLists.txt           |  11 +
 .../x64-linux-dynamic-release.cmake           |  14 +
 .../custom-triplets/x64-windows-release       |  10 +
 7 files changed, 649 insertions(+)
 create mode 100644 .github/workflows/clients-cpp-python-ubuntu2404.yml
 create mode 100644 .github/workflows/clients-cpp-python-windows.yml
 create mode 100644 .github/workflows/clients-csharp.yml
 create mode 100644 .github/workflows/dhc-version.yml
 create mode 100644 cpp-client/deephaven/custom-triplets/x64-linux-dynamic-release.cmake
 create mode 100644 cpp-client/deephaven/custom-triplets/x64-windows-release

diff --git a/.github/workflows/clients-cpp-python-ubuntu2404.yml b/.github/workflows/clients-cpp-python-ubuntu2404.yml
new file mode 100644
index 00000000000..97e454d3267
--- /dev/null
+++ b/.github/workflows/clients-cpp-python-ubuntu2404.yml
@@ -0,0 +1,262 @@
+name: "Build C++ and Python Clients on Ubuntu 24.04"
+on:
+  pull_request:
+    branches: [ 'main', 'rc/v*' ]
+  push:
+    branches: [ 'main', 'check/**', 'release/v*' ]
+permissions:
+  packages: write
+
+#===============================================================================
+# Background: in this workflow there are three different kinds of caching going
+# on:
+#
+# 1. The outputs are Github Build artifacts, attached to every action run.
+#    These artifacts can be downloaded from e.g.
+#    https://github.com/deephaven/deephaven-core/actions/runs/17416308139
+#    but the specific URL depends on the build.
+#    We use this to upload:
+#    - The C++ install directory
+#    - The .whl file for the static Python client
+#    - The .whl file for the ticking Python client
+#
+# 2. The C++ install directory is cached via actions/cache, and keyed
+#    by the hash of the cpp-client and proto directories. This allows us
+#    to skip recompilation if these files don't change. This is an optional
+#    optimization that might not be very significant.
+#
+# 3. Github Packages, which is a NuGet-compatible repo accessible from
+#    https://github.com/orgs/deephaven/packages?repo_name=deephaven-core
+#    and controlled via the NuGet API. We use this package repository to hold
+#    the binaries for the C++ dependencies e build (grpc, arrow, etc.). It is
+#    managed automatically for us by cmake/vcpkg/nuget. This optimization is
+#    important because building the C++ dependencies takes significant time
+#    (45 minutes maybe).
+#===============================================================================
+
+env:
+  GH_PACKAGES_USERNAME: ${{ github.repository_owner }}
+  GH_PACKAGES_FEED: https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json
+  DHINSTALL: ${{ github.workspace }}/dhinstall
+
+jobs:
+  #=============================================================================
+  # Identify version of Deephaven Core
+  #=============================================================================
+  version_job:
+    uses: ./.github/workflows/dhc-version.yml
+
+  #=============================================================================
+  # Build the C++ Client
+  #=============================================================================
+  cpp_job:
+    name: Build C++ client on Ubuntu or fetch from cache
+    runs-on: ubuntu-24.04
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+      - name: Check out this repo
+        uses: actions/checkout@v6
+
+      # Try to fetch the whole installation directory (the final product of the
+      # build) from the Github Cache. The key to this cache is derived
+      # from the hash of the contents of the files in the cpp-client and proto
+      # directories. If this fetch is successful, we skip over all the build
+      # work and just copy this cached install directory to the output artifact
+      # for this run.
+
+      - name: Restore the cached installation directory, or prepare a new one
+        id: cache-cpp-install
+        uses: actions/cache@v5
+        with:
+          path: ${{ env.DHINSTALL }}
+          key: ${{ runner.os }}-cpp-client-${{ hashFiles('cpp-client/**', 'proto/**') }}
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Check out vcpkg
+
+      - name: Check out vcpkg
+        id: checkout-vcpkg
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        uses: actions/checkout@v6
+        with:
+          repository: microsoft/vcpkg
+          path: vcpkg
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Bootstrap vcpkg
+
+      - name: Bootstrap vcpkg
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: ${{ github.workspace }}/vcpkg/bootstrap-vcpkg.sh
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Get mono so that we can run nuget. This is because the nuget.exe that
+      # ships with vcpkg is an old .NET Framework binary (Windows format), and
+      # only mono knows how to run such a thing on Linux. Some day the maintainers
+      # will fix this so it runs with the cross-platform "dotnet".
+
+      - name: Get mono so that we can run nuget
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: sudo apt install mono-complete
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Adapted from
+      # https://learn.microsoft.com/en-us/vcpkg/consume/binary-caching-github-packages?pivots=linux-runner
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      - name: "Configure nuget to know how to download (or upload) each cached package that we need (or create)"
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: |
+          vcpkg_exe=${{ github.workspace }}/vcpkg/vcpkg
+          nuget_dotnet=$($vcpkg_exe fetch nuget | tail -n 1)
+          mono $nuget_dotnet \
+            sources add \
+            -Source "${{ env.GH_PACKAGES_FEED }}" \
+            -StorePasswordInClearText \
+            -Name GitHubPackages \
+            -UserName "${{ env.GH_PACKAGES_USERNAME }}" \
+            -Password "${{ secrets.GITHUB_TOKEN }}"
+          mono $nuget_dotnet \
+            setapikey "${{ secrets.GITHUB_TOKEN }}" \
+            -Source "${{ env.GH_PACKAGES_FEED }}"
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # 1. Invoke vcpkg to:
+      #    a) Try to fetch each of the dependent libraries from the nuget cache
+      #    b) If not found, build them and insert them in the nuget cache
+      # 2. Configure cmake to prepare for the build/install step, which comes next
+
+      - name: build packages and configure cmake. Cached packages will be found, or stored in github's nuget repo
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        env:
+          VCPKG_BINARY_SOURCES: "clear;nuget,${{ env.GH_PACKAGES_FEED }},readwrite"
+        run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain ${{ github.workspace }}/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_INSTALL_PREFIX=${{ env.DHINSTALL }} -DVCPKG_TARGET_TRIPLET=x64-linux-dynamic-release -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Build our executables and install them in the configured install directory {{ env.DHINSTALL }}
+
+      - name: Run cmake build and install
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: cmake --build cpp-client/deephaven/build --config RelWithDebInfo --target install --parallel
+
+      # Upload results as build artifact. Note: if cache-cpp-install was
+      # then none of the intervening steps were executed. In that case,
+      # this effectively just copies the cache to the build artifact.
+
+      - name: Upload install directory as build artifact
+        id: upload-install-directory
+        uses: actions/upload-artifact@v7
+        with:
+          name: cpp-client-install
+          path: ${{ env.DHINSTALL }}
+
+  #=============================================================================
+  # Build the Python Static Client
+  #=============================================================================
+
+  python_static_job:
+    name: Build Python static client on Ubuntu
+    runs-on: ubuntu-24.04
+    needs: [version_job]
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+      - name: Check out this repo
+        uses: actions/checkout@v6
+
+      - name: Install Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.10'
+
+      - name: Install the 'wheel' package
+        run: pip3 install wheel
+
+      - name: Install requirements-dev.txt
+        run: |
+          cd ./py/client
+          pip3 install -r requirements-dev.txt
+
+      - name: Run setup.py
+        env:
+          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
+        run: |
+          cd ./py/client
+          python setup.py bdist_wheel
+
+      - name: Upload static .whl file as build artifact, to be used directly or by dependent clients like Python ticking
+        uses: actions/upload-artifact@v7
+        with:
+          name: py-static-wheel
+          path: ./py/client/dist/*.whl
+
+  #=============================================================================
+  # Build the Python Ticking Client
+  #=============================================================================
+
+  python_ticking_job:
+    name: Build Python ticking client on Ubuntu
+    runs-on: ubuntu-24.04
+    needs: [cpp_job, python_static_job, version_job]
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+      - name: Check out this repo
+        uses: actions/checkout@v6
+
+      - name: Get the C++ installation as a build artifact
+        uses: actions/download-artifact@v8
+        with:
+          name: cpp-client-install
+          path: ${{ env.DHINSTALL }}
+
+      - name: Get the Python static installation as a build artifact
+        uses: actions/download-artifact@v8
+        with:
+          name: py-static-wheel
+          path: ./py/client/dist/
+
+      - name: Install Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.10'
+
+      - name: Install the 'wheel' and 'cython' packages
+        run: pip3 install wheel cython
+
+      - name: Install requirements-dev.txt
+        run: |
+          cd ./py/client
+          pip3 install -r requirements-dev.txt
+
+      - name: Install the static client
+        run: pip3 install --force --no-deps ./py/client/dist/*.whl
+
+      - name: Build cython code
+        env:
+          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
+          CPPFLAGS: -I${{ env.DHINSTALL }}/include
+          LDFLAGS: -L${{ env.DHINSTALL }}/lib
+        run: |
+          cd ./py/client-ticking
+          python setup.py build_ext -i
+
+      - name: Run setup.py
+        env:
+          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
+        run: |
+          cd ./py/client-ticking
+          python setup.py bdist_wheel
+
+      - name: Upload ticking .whl file as build artifact
+        uses: actions/upload-artifact@v7
+        with:
+          name: py-ticking-wheel
+          path: ./py/client-ticking/dist/*.whl
diff --git a/.github/workflows/clients-cpp-python-windows.yml b/.github/workflows/clients-cpp-python-windows.yml
new file mode 100644
index 00000000000..d43bb3d9fbe
--- /dev/null
+++ b/.github/workflows/clients-cpp-python-windows.yml
@@ -0,0 +1,255 @@
+name: "Build C++ and Python Clients on Windows"
+on:
+  pull_request:
+    branches: [ 'main', 'rc/v*' ]
+  push:
+    branches: [ 'main', 'check/**', 'release/v*' ]
+permissions:
+  packages: write
+
+#===============================================================================
+# Background: in this workflow there are three different kinds of caching going
+# on:
+#
+# 1. The outputs are Github Build artifacts, attached to every action run.
+#    These artifacts can be downloaded from e.g.
+#    https://github.com/deephaven/deephaven-core/actions/runs/17416308139
+#    but the specific URL depends on the build.
+#    We use this to upload:
+#    - The C++ install directory
+#    - The .whl file for the static Python client
+#    - The .whl file for the ticking Python client
+#
+# 2. The C++ install directory is cached via actions/cache, and keyed
+#    by the hash of the cpp-client and proto directories. This allows us
+#    to skip recompilation if these files don't change. This is an optional
+#    optimization that might not be very significant.
+#
+# 3. Github Packages, which is a NuGet-compatible repo accessible from
+#    https://github.com/orgs/deephaven/packages?repo_name=deephaven-core
+#    and controlled via the NuGet API. We use this package repository to hold
+#    the binaries for the C++ dependencies e build (grpc, arrow, etc.). It is
+#    managed automatically for us by cmake/vcpkg/nuget. This optimization is
+#    important because building the C++ dependencies takes significant time
+#    (45 minutes maybe).
+#===============================================================================
+
+env:
+  GH_PACKAGES_USERNAME: ${{ github.repository_owner }}
+  GH_PACKAGES_FEED: https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json
+  DHINSTALL: ${{ github.workspace }}/dhinstall
+
+jobs:
+  #=============================================================================
+  # Identify version of Deephaven Core
+  #=============================================================================
+  version_job:
+    uses: ./.github/workflows/dhc-version.yml
+
+  #=============================================================================
+  # Build the C++ Client
+  #=============================================================================
+  cpp_job:
+    name: Build C++ client on Windows or fetch from cache
+    runs-on: windows-2025
+    defaults:
+      run:
+        shell: cmd
+
+    steps:
+      - name: Check out this repo
+        uses: actions/checkout@v6
+
+      # Try to fetch the whole installation directory (the final product of the
+      # build) from the Github Cache. The key to this cache is derived
+      # from the hash of the contents of the files in the cpp-client and proto
+      # directories. If this fetch is successful, we skip over all the build
+      # work and just copy this cached install directory to the output artifact
+      # for this run.
+
+      - name: Restore the cached installation directory, or prepare a new one
+        id: cache-cpp-install
+        uses: actions/cache@v5
+        with:
+          path: ${{ env.DHINSTALL }}
+          key: ${{ runner.os }}-cpp-client-${{ hashFiles('cpp-client/**', 'proto/**') }}
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Check out vcpkg
+
+      - name: Check out vcpkg
+        id: checkout-vcpkg
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        uses: actions/checkout@v6
+        with:
+          repository: microsoft/vcpkg
+          path: vcpkg
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Bootstrap vcpkg
+
+      - name: Bootstrap vcpkg
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: ${{ github.workspace }}/vcpkg/bootstrap-vcpkg.bat
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Adapted from
+      # https://learn.microsoft.com/en-us/vcpkg/consume/binary-caching-github-packages?pivots=linux-runner
+
+      - name: "Configure nuget to know how to download (or upload) each cached package that we need (or create)"
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        shell: pwsh
+        run: |
+          $nuget_exe = & ./vcpkg/vcpkg.exe fetch nuget
+          & $nuget_exe sources add `
+          -Source "${{ env.GH_PACKAGES_FEED }}" `
+          -StorePasswordInClearText `
+          -Name GitHubPackages `
+          -UserName "${{ env.GH_PACKAGES_USERNAME }}" `
+          -Password "${{ secrets.GITHUB_TOKEN }}"
+          & $nuget_exe setapikey "${{ secrets.GITHUB_TOKEN }}" -Source "${{ env.GH_PACKAGES_FEED }}"
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # 1. Invoke vcpkg to:
+      #    a) Try to fetch each of the dependent libraries from the nuget cache
+      #    b) If not found, build them and insert them in the nuget cache
+      # 2. Configure cmake to prepare for the build/install step, which comes next
+
+      - name: build packages and configure cmake. Cached packages will be found, or stored in github's nuget repo
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        env:
+          VCPKG_BINARY_SOURCES: "clear;nuget,${{ env.GH_PACKAGES_FEED }},readwrite"
+        run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain ${{ github.workspace }}/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_INSTALL_PREFIX=${{ env.DHINSTALL }} -DX_VCPKG_APPLOCAL_DEPS_INSTALL=ON -DVCPKG_TARGET_TRIPLET=x64-windows-release -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Build our executables and install them in the configured install directory {{ env.DHINSTALL }}
+
+      - name: Run cmake build and install
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: cmake --build cpp-client/deephaven/build --config RelWithDebInfo --target install --parallel
+
+      # [Note: skip this step if cache-cpp-install was successful]
+
+      # Upload results as build artifact. Note: if cache-cpp-install was
+      # then none of the intervening steps were executed. In that case,
+      # this effectively just copies the cache to the build artifact.
+
+      - name: Upload install directory as build artifact
+        id: upload-install-directory
+        uses: actions/upload-artifact@v7
+        with:
+          name: cpp-client-install
+          path: ${{ env.DHINSTALL }}
+
+  #=============================================================================
+  # Build the Python Static Client
+  #=============================================================================
+
+  python_static_job:
+    name: Build Python static client on Windows
+    runs-on: windows-2025
+    needs: [version_job]
+    defaults:
+      run:
+        shell: cmd
+
+    steps:
+      - name: Check out this repo
+        uses: actions/checkout@v6
+
+      - name: Install Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.10'
+
+      - name: Install the 'wheel' package
+        run: pip3 install wheel
+
+      - name: Install requirements-dev.txt
+        run: |
+          cd .\py\client
+          pip3 install -r requirements-dev.txt
+
+      - name: Run setup.py
+        env:
+          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
+        run: |
+          cd .\py\client
+          python setup.py bdist_wheel
+
+      - name: Upload static .whl file as build artifact, to be used directly or by dependent clients like Python ticking
+        uses: actions/upload-artifact@v7
+        with:
+          name: py-static-wheel
+          path: ./py/client/dist/*.whl
+
+  #=============================================================================
+  # Build the Python Ticking Client
+  #=============================================================================
+
+  python_ticking_job:
+    name: Build Python ticking client on Windows
+    runs-on: windows-2025
+    needs: [cpp_job, python_static_job, version_job]
+    defaults:
+      run:
+        shell: cmd
+
+    steps:
+      - name: Check out this repo
+        uses: actions/checkout@v6
+
+      - name: Get the C++ installation as a build artifact
+        uses: actions/download-artifact@v8
+        with:
+          name: cpp-client-install
+          path: ${{ env.DHINSTALL }}
+
+      - name: Get the Python static installation as a build artifact
+        uses: actions/download-artifact@v8
+        with:
+          name: py-static-wheel
+          path: ./py/client/dist/
+
+      - name: Install Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.10'
+
+      - name: Install the 'wheel' and 'cython' packages
+        run: pip3 install wheel cython
+
+      - name: Install requirements-dev.txt
+        run: |
+          cd .\py\client
+          pip3 install -r requirements-dev.txt
+
+      - name: Install the static client
+        shell: pwsh
+        run: |
+          $wheel = (Get-ChildItem -Path .\py\client\dist\*.whl).FullName
+          pip3 install --force --no-deps $wheel
+
+      # Pinned to a specific SHA to avoid future surprises
+      - name: set up PATH to be able to run Visual Studio tools like cl.exe
+        uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756
+
+      - name: Build cython code
+        env:
+          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
+        run: |
+          cd .\py\client-ticking
+          python setup.py build_ext -i
+
+      - name: Run setup.py
+        env:
+          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
+        run: |
+          cd .\py\client-ticking
+          python setup.py bdist_wheel
+
+      - name: Upload ticking .whl file as build artifact
+        uses: actions/upload-artifact@v7
+        with:
+          name: py-ticking-wheel
+          path: ./py/client-ticking/dist/*.whl
diff --git a/.github/workflows/clients-csharp.yml b/.github/workflows/clients-csharp.yml
new file mode 100644
index 00000000000..325124cb783
--- /dev/null
+++ b/.github/workflows/clients-csharp.yml
@@ -0,0 +1,58 @@
+name: "Build .NET Client on Ubuntu 24.04"
+on:
+  pull_request:
+    branches: [ 'main', 'rc/v*' ]
+  push:
+    branches: [ 'main', 'check/**', 'release/v*' ]
+permissions:
+  packages: write
+
+env:
+  GH_PACKAGES_USERNAME: ${{ github.repository_owner }}
+  GH_PACKAGES_FEED: https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json
+  DHINSTALL: ${{ github.workspace }}/dhinstall
+
+jobs:
+  #=============================================================================
+  # Identify version of Deephaven Core
+  #=============================================================================
+  version_job:
+    uses: ./.github/workflows/dhc-version.yml
+    
+  #=============================================================================
+  # Build the .NET Client
+  #=============================================================================
+  dotnet_job:
+    name: Build .NET client on Ubuntu
+    runs-on: ubuntu-24.04
+    needs: version_job
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+      - name: Check out this repo
+        uses: actions/checkout@v6
+
+      - name: Setup dotnet
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Build Deephaven Core C# Client
+        run: |
+          cd csharp/client/Dh_NetClient
+          dotnet build -c Release
+
+      - name: Create unsigned NuGet package
+        env:
+          DHC_VERSION: ${{ needs.version_job.outputs.dhc_version }}
+        run: |
+          cd csharp/client/Dh_NetClient
+          dotnet pack --no-build -c Release /p:Platform="Any CPU" /p:PackageVersion=$DHC_VERSION
+
+      - name: Upload unsigned NuGet package as build artifact
+        uses: actions/upload-artifact@v7
+        with:
+          name: dotnet-client
+          path: ./csharp/client/Dh_NetClient/bin/Release/*.nupkg
diff --git a/.github/workflows/dhc-version.yml b/.github/workflows/dhc-version.yml
new file mode 100644
index 00000000000..913ba6c9b46
--- /dev/null
+++ b/.github/workflows/dhc-version.yml
@@ -0,0 +1,39 @@
+name: "Determine Deephaven Core version"
+on:
+  workflow_call:
+    outputs:
+      dhc_version:
+        description: "The detected version of Deephaven Core"
+        value: ${{ jobs.version_job.outputs.dhc_version }}
+
+jobs:
+  #=============================================================================
+  # Identify version of Deephaven Core
+  #=============================================================================
+  version_job:
+    name: Find the Deephaven version by running awk on gradle.properties
+    runs-on: ubuntu-24.04
+    defaults:
+      run:
+        shell: bash
+
+    outputs:
+      dhc_version: ${{ steps.get-dhc-version.outputs.dhc_version }}
+
+    steps:
+      - name: Check out this repo
+        uses: actions/checkout@v6
+
+      - name: Output Deephaven Version
+        id: get-dhc-version
+        run: |
+          DHC_VERSION=$(awk -F= '
+            /^[^#]/ { props[$1] = $2 }
+            END {
+              v = props["deephavenMajorVersion"] "." props["deephavenMinorVersion"]
+              if (props["deephavenBaseQualifier"] != "") v = v "-" props["deephavenBaseQualifier"]
+              print v
+            }
+          ' gradle.properties)
+          echo "dhc_version=$DHC_VERSION" >> $GITHUB_OUTPUT
+          echo FYI dhc_version is $DHC_VERSION
diff --git a/cpp-client/deephaven/CMakeLists.txt b/cpp-client/deephaven/CMakeLists.txt
index 041fc1603a1..b764c348a9b 100644
--- a/cpp-client/deephaven/CMakeLists.txt
+++ b/cpp-client/deephaven/CMakeLists.txt
@@ -52,6 +52,17 @@ if(NOT DHCORE_ONLY)
         INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
         )
 
+    if(VCPKG_TOOLCHAIN AND NOT WIN32)
+        install(DIRECTORY ${CMAKE_BINARY_DIR}/vcpkg_installed/${VCPKG_TARGET_TRIPLET}/lib/
+            DESTINATION lib
+            FILES_MATCHING
+                PATTERN "*.so"
+                PATTERN "*.so.*"
+                PATTERN "pkgconfig" EXCLUDE
+                PATTERN "cmake" EXCLUDE
+        )
+    endif()
+
       include(CMakePackageConfigHelpers)
       write_basic_package_version_file(
         "${CMAKE_CURRENT_BINARY_DIR}/deephaven/deephavenConfigVersion.cmake"
diff --git a/cpp-client/deephaven/custom-triplets/x64-linux-dynamic-release.cmake b/cpp-client/deephaven/custom-triplets/x64-linux-dynamic-release.cmake
new file mode 100644
index 00000000000..4921b59b897
--- /dev/null
+++ b/cpp-client/deephaven/custom-triplets/x64-linux-dynamic-release.cmake
@@ -0,0 +1,14 @@
+# These settings are inspired by [vcpkg repo]/triplets/x64-linux.cmake
+
+# These settings are the same:
+set(VCPKG_TARGET_ARCHITECTURE x64)
+set(VCPKG_CRT_LINKAGE dynamic)
+set(VCPKG_CMAKE_SYSTEM_NAME Linux)
+
+# This setting is changed because we want dynamic library linking
+# rather than static.
+set(VCPKG_LIBRARY_LINKAGE dynamic)
+
+# This setting is new because we want to build only the 'release'
+# version of the packages, rather the both 'debug' and 'release'
+set(VCPKG_BUILD_TYPE release)
diff --git a/cpp-client/deephaven/custom-triplets/x64-windows-release b/cpp-client/deephaven/custom-triplets/x64-windows-release
new file mode 100644
index 00000000000..49034cbe0f4
--- /dev/null
+++ b/cpp-client/deephaven/custom-triplets/x64-windows-release
@@ -0,0 +1,10 @@
+# These settings are inspired by [vcpkg repo]/triplets/x64-windows.cmake
+
+# These settings are the same:
+set(VCPKG_TARGET_ARCHITECTURE x64)
+set(VCPKG_CRT_LINKAGE dynamic)
+set(VCPKG_LIBRARY_LINKAGE dynamic)
+
+# This setting is new because we want to build only the 'release'
+# version of the packages, rather the both 'debug' and 'release'
+set(VCPKG_BUILD_TYPE release)

From 10b078cd7290af1500860493bac38d216cd0b0ad Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Fri, 1 May 2026 13:43:48 -0400
Subject: [PATCH 02/39] touch a file to trigger a build

---
 COOKIE.txt | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 COOKIE.txt

diff --git a/COOKIE.txt b/COOKIE.txt
new file mode 100644
index 00000000000..ce013625030
--- /dev/null
+++ b/COOKIE.txt
@@ -0,0 +1 @@
+hello

From ddc91a1281927a678539007f95750bcc02c47302 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Fri, 1 May 2026 13:43:55 -0400
Subject: [PATCH 03/39] Revert "touch a file to trigger a build"

This reverts commit 10b078cd7290af1500860493bac38d216cd0b0ad.
---
 COOKIE.txt | 1 -
 1 file changed, 1 deletion(-)
 delete mode 100644 COOKIE.txt

diff --git a/COOKIE.txt b/COOKIE.txt
deleted file mode 100644
index ce013625030..00000000000
--- a/COOKIE.txt
+++ /dev/null
@@ -1 +0,0 @@
-hello

From be99f3a4075e7dc36b69fee3f0654fbd120d6d97 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Fri, 1 May 2026 16:46:19 -0400
Subject: [PATCH 04/39] rename step

---
 .github/workflows/clients-cpp-python-ubuntu2404.yml | 2 +-
 .github/workflows/clients-cpp-python-windows.yml    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/clients-cpp-python-ubuntu2404.yml b/.github/workflows/clients-cpp-python-ubuntu2404.yml
index 97e454d3267..18d91ff19a8 100644
--- a/.github/workflows/clients-cpp-python-ubuntu2404.yml
+++ b/.github/workflows/clients-cpp-python-ubuntu2404.yml
@@ -129,7 +129,7 @@ jobs:
       #    b) If not found, build them and insert them in the nuget cache
       # 2. Configure cmake to prepare for the build/install step, which comes next
 
-      - name: build packages and configure cmake. Cached packages will be found, or stored in github's nuget repo
+      - name: "Build packages and configure cmake. Check nupkg cache for existing packages, otherwise build and upload."
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         env:
           VCPKG_BINARY_SOURCES: "clear;nuget,${{ env.GH_PACKAGES_FEED }},readwrite"
diff --git a/.github/workflows/clients-cpp-python-windows.yml b/.github/workflows/clients-cpp-python-windows.yml
index d43bb3d9fbe..b3935e3c891 100644
--- a/.github/workflows/clients-cpp-python-windows.yml
+++ b/.github/workflows/clients-cpp-python-windows.yml
@@ -115,7 +115,7 @@ jobs:
       #    b) If not found, build them and insert them in the nuget cache
       # 2. Configure cmake to prepare for the build/install step, which comes next
 
-      - name: build packages and configure cmake. Cached packages will be found, or stored in github's nuget repo
+      - name: "Build packages and configure cmake. Check nupkg cache for existing packages, otherwise build and upload."
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         env:
           VCPKG_BINARY_SOURCES: "clear;nuget,${{ env.GH_PACKAGES_FEED }},readwrite"

From 11c44b01eea47e76067916eb7c418c789cc260b6 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 14:54:27 -0400
Subject: [PATCH 05/39] let's see what it feels like when names are shorter

---
 .github/workflows/clients-csharp.yml | 2 +-
 .github/workflows/dhc-version.yml    | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/clients-csharp.yml b/.github/workflows/clients-csharp.yml
index 325124cb783..4883c919830 100644
--- a/.github/workflows/clients-csharp.yml
+++ b/.github/workflows/clients-csharp.yml
@@ -1,4 +1,4 @@
-name: "Build .NET Client on Ubuntu 24.04"
+name: "C# Client-ubu24"
 on:
   pull_request:
     branches: [ 'main', 'rc/v*' ]
diff --git a/.github/workflows/dhc-version.yml b/.github/workflows/dhc-version.yml
index 913ba6c9b46..251ddaa2fc7 100644
--- a/.github/workflows/dhc-version.yml
+++ b/.github/workflows/dhc-version.yml
@@ -1,4 +1,4 @@
-name: "Determine Deephaven Core version"
+name: "Get DHC version"
 on:
   workflow_call:
     outputs:
@@ -8,10 +8,10 @@ on:
 
 jobs:
   #=============================================================================
-  # Identify version of Deephaven Core
+  # Identify version of Deephaven Core by running awk on gradle.properties
   #=============================================================================
   version_job:
-    name: Find the Deephaven version by running awk on gradle.properties
+    name: "Get DHC version"
     runs-on: ubuntu-24.04
     defaults:
       run:

From b7e400e9b6e6cec0e21bfa3d5e9d5a15f56e85ed Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 15:09:11 -0400
Subject: [PATCH 06/39] let's see how this looks now

---
 .../workflows/clients-cpp-python-windows.yml  | 42 +++++++++++--------
 1 file changed, 24 insertions(+), 18 deletions(-)

diff --git a/.github/workflows/clients-cpp-python-windows.yml b/.github/workflows/clients-cpp-python-windows.yml
index b3935e3c891..7a68a336f48 100644
--- a/.github/workflows/clients-cpp-python-windows.yml
+++ b/.github/workflows/clients-cpp-python-windows.yml
@@ -1,4 +1,4 @@
-name: "Build C++ and Python Clients on Windows"
+name: "C++/Python on Windows"
 on:
   pull_request:
     branches: [ 'main', 'rc/v*' ]
@@ -50,7 +50,7 @@ jobs:
   # Build the C++ Client
   #=============================================================================
   cpp_job:
-    name: Build C++ client on Windows or fetch from cache
+    name: "Build C++ (or use cache)"
     runs-on: windows-2025
     defaults:
       run:
@@ -93,10 +93,12 @@ jobs:
         run: ${{ github.workspace }}/vcpkg/bootstrap-vcpkg.bat
 
       # [Note: skip this step if cache-cpp-install was successful]
+      # Configure nuget to know how to download (or upload) each cached
+      # package that we need (or create)
       # Adapted from
       # https://learn.microsoft.com/en-us/vcpkg/consume/binary-caching-github-packages?pivots=linux-runner
 
-      - name: "Configure nuget to know how to download (or upload) each cached package that we need (or create)"
+      - name: "Configure nuget"
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         shell: pwsh
         run: |
@@ -110,12 +112,13 @@ jobs:
           & $nuget_exe setapikey "${{ secrets.GITHUB_TOKEN }}" -Source "${{ env.GH_PACKAGES_FEED }}"
 
       # [Note: skip this step if cache-cpp-install was successful]
+      # Build packages and configure cmake. Check nupkg cache for existing
+      # packages, otherwise build and upload.
       # 1. Invoke vcpkg to:
       #    a) Try to fetch each of the dependent libraries from the nuget cache
       #    b) If not found, build them and insert them in the nuget cache
       # 2. Configure cmake to prepare for the build/install step, which comes next
-
-      - name: "Build packages and configure cmake. Check nupkg cache for existing packages, otherwise build and upload."
+      - name: "Build/cache dependencies"
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         env:
           VCPKG_BINARY_SOURCES: "clear;nuget,${{ env.GH_PACKAGES_FEED }},readwrite"
@@ -124,7 +127,7 @@ jobs:
       # [Note: skip this step if cache-cpp-install was successful]
       # Build our executables and install them in the configured install directory {{ env.DHINSTALL }}
 
-      - name: Run cmake build and install
+      - name: "Build and install"
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         run: cmake --build cpp-client/deephaven/build --config RelWithDebInfo --target install --parallel
 
@@ -134,7 +137,7 @@ jobs:
       # then none of the intervening steps were executed. In that case,
       # this effectively just copies the cache to the build artifact.
 
-      - name: Upload install directory as build artifact
+      - name: Upload install dir
         id: upload-install-directory
         uses: actions/upload-artifact@v7
         with:
@@ -146,7 +149,7 @@ jobs:
   #=============================================================================
 
   python_static_job:
-    name: Build Python static client on Windows
+    name: Python static
     runs-on: windows-2025
     needs: [version_job]
     defaults:
@@ -162,7 +165,7 @@ jobs:
         with:
           python-version: '3.10'
 
-      - name: Install the 'wheel' package
+      - name: Install 'wheel' package
         run: pip3 install wheel
 
       - name: Install requirements-dev.txt
@@ -177,7 +180,8 @@ jobs:
           cd .\py\client
           python setup.py bdist_wheel
 
-      - name: Upload static .whl file as build artifact, to be used directly or by dependent clients like Python ticking
+      # Upload .whl file as build artifact, to be used directly or by dependent clients like Python ticking
+      - name: Upload .whl file
         uses: actions/upload-artifact@v7
         with:
           name: py-static-wheel
@@ -188,7 +192,7 @@ jobs:
   #=============================================================================
 
   python_ticking_job:
-    name: Build Python ticking client on Windows
+    name: Python ticking
     runs-on: windows-2025
     needs: [cpp_job, python_static_job, version_job]
     defaults:
@@ -199,13 +203,15 @@ jobs:
       - name: Check out this repo
         uses: actions/checkout@v6
 
-      - name: Get the C++ installation as a build artifact
+      # Get the C++ installation as a build artifact
+      - name: Fetch C++ installation
         uses: actions/download-artifact@v8
         with:
           name: cpp-client-install
           path: ${{ env.DHINSTALL }}
 
-      - name: Get the Python static installation as a build artifact
+      # Get the Python static installation as a build artifact
+      - name: Fetch Python static installation
         uses: actions/download-artifact@v8
         with:
           name: py-static-wheel
@@ -216,7 +222,7 @@ jobs:
         with:
           python-version: '3.10'
 
-      - name: Install the 'wheel' and 'cython' packages
+      - name: "Install the 'wheel' and 'cython' packages"
         run: pip3 install wheel cython
 
       - name: Install requirements-dev.txt
@@ -224,17 +230,17 @@ jobs:
           cd .\py\client
           pip3 install -r requirements-dev.txt
 
-      - name: Install the static client
+      - name: Install static client
         shell: pwsh
         run: |
           $wheel = (Get-ChildItem -Path .\py\client\dist\*.whl).FullName
           pip3 install --force --no-deps $wheel
 
       # Pinned to a specific SHA to avoid future surprises
-      - name: set up PATH to be able to run Visual Studio tools like cl.exe
+      - name: set up PATH for cl.exe
         uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756
 
-      - name: Build cython code
+      - name: Build our Cython
         env:
           DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
         run: |
@@ -248,7 +254,7 @@ jobs:
           cd .\py\client-ticking
           python setup.py bdist_wheel
 
-      - name: Upload ticking .whl file as build artifact
+      - name: Upload .whl file
         uses: actions/upload-artifact@v7
         with:
           name: py-ticking-wheel

From fc8cc8acdd5bcfc5fe952cb552f4f1d0e21d5671 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 15:17:17 -0400
Subject: [PATCH 07/39] lots more renames.  Bring it on!!

---
 .../clients-cpp-python-ubuntu2404.yml         | 38 ++++++++++++-------
 .../workflows/clients-cpp-python-windows.yml  | 10 +++--
 .github/workflows/clients-csharp.yml          |  2 +-
 3 files changed, 31 insertions(+), 19 deletions(-)

diff --git a/.github/workflows/clients-cpp-python-ubuntu2404.yml b/.github/workflows/clients-cpp-python-ubuntu2404.yml
index 18d91ff19a8..29a39066a5a 100644
--- a/.github/workflows/clients-cpp-python-ubuntu2404.yml
+++ b/.github/workflows/clients-cpp-python-ubuntu2404.yml
@@ -1,4 +1,4 @@
-name: "Build C++ and Python Clients on Ubuntu 24.04"
+name: "C++/Python on Ubuntu24"
 on:
   pull_request:
     branches: [ 'main', 'rc/v*' ]
@@ -50,7 +50,7 @@ jobs:
   # Build the C++ Client
   #=============================================================================
   cpp_job:
-    name: Build C++ client on Ubuntu or fetch from cache
+    name: "Build C++ (or use cache)"
     runs-on: ubuntu-24.04
     defaults:
       run:
@@ -67,7 +67,7 @@ jobs:
       # work and just copy this cached install directory to the output artifact
       # for this run.
 
-      - name: Restore the cached installation directory, or prepare a new one
+      - name: Try to restore cached installdir
         id: cache-cpp-install
         uses: actions/cache@v5
         with:
@@ -107,7 +107,10 @@ jobs:
       # https://learn.microsoft.com/en-us/vcpkg/consume/binary-caching-github-packages?pivots=linux-runner
 
       # [Note: skip this step if cache-cpp-install was successful]
-      - name: "Configure nuget to know how to download (or upload) each cached package that we need (or create)"
+      # Configure nuget to know how to download (or upload) each cached
+      # package that we need (or create)
+
+      - name: "Configure nuget"
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         run: |
           vcpkg_exe=${{ github.workspace }}/vcpkg/vcpkg
@@ -124,21 +127,24 @@ jobs:
             -Source "${{ env.GH_PACKAGES_FEED }}"
 
       # [Note: skip this step if cache-cpp-install was successful]
+      # Build packages and configure cmake. Check nupkg cache for existing
+      # packages, otherwise build and upload.
       # 1. Invoke vcpkg to:
       #    a) Try to fetch each of the dependent libraries from the nuget cache
       #    b) If not found, build them and insert them in the nuget cache
       # 2. Configure cmake to prepare for the build/install step, which comes next
 
-      - name: "Build packages and configure cmake. Check nupkg cache for existing packages, otherwise build and upload."
+      - name: "Build/cache dependencies"
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         env:
           VCPKG_BINARY_SOURCES: "clear;nuget,${{ env.GH_PACKAGES_FEED }},readwrite"
         run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain ${{ github.workspace }}/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_INSTALL_PREFIX=${{ env.DHINSTALL }} -DVCPKG_TARGET_TRIPLET=x64-linux-dynamic-release -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
 
       # [Note: skip this step if cache-cpp-install was successful]
-      # Build our executables and install them in the configured install directory {{ env.DHINSTALL }}
+      # Build our executables and install them in the configured install
+      # directory {{ env.DHINSTALL }}
 
-      - name: Run cmake build and install
+      - name: Build and install
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         run: cmake --build cpp-client/deephaven/build --config RelWithDebInfo --target install --parallel
 
@@ -146,7 +152,7 @@ jobs:
       # then none of the intervening steps were executed. In that case,
       # this effectively just copies the cache to the build artifact.
 
-      - name: Upload install directory as build artifact
+      - name: Upload install dir
         id: upload-install-directory
         uses: actions/upload-artifact@v7
         with:
@@ -158,7 +164,7 @@ jobs:
   #=============================================================================
 
   python_static_job:
-    name: Build Python static client on Ubuntu
+    name: Python static
     runs-on: ubuntu-24.04
     needs: [version_job]
     defaults:
@@ -189,7 +195,8 @@ jobs:
           cd ./py/client
           python setup.py bdist_wheel
 
-      - name: Upload static .whl file as build artifact, to be used directly or by dependent clients like Python ticking
+      # Upload static .whl file as build artifact, to be used directly or by          # dependent clients like Python ticking
+      - name: Upload .whl file
         uses: actions/upload-artifact@v7
         with:
           name: py-static-wheel
@@ -200,7 +207,7 @@ jobs:
   #=============================================================================
 
   python_ticking_job:
-    name: Build Python ticking client on Ubuntu
+    name: Python ticking
     runs-on: ubuntu-24.04
     needs: [cpp_job, python_static_job, version_job]
     defaults:
@@ -211,13 +218,16 @@ jobs:
       - name: Check out this repo
         uses: actions/checkout@v6
 
-      - name: Get the C++ installation as a build artifact
+      # Get the C++ installation as a build artifact
+      - name: Fetch C++ installation
         uses: actions/download-artifact@v8
         with:
           name: cpp-client-install
           path: ${{ env.DHINSTALL }}
 
-      - name: Get the Python static installation as a build artifact
+
+      # Get the Python static installation as a build artifact
+      - name: Fetch Python static installation
         uses: actions/download-artifact@v8
         with:
           name: py-static-wheel
@@ -239,7 +249,7 @@ jobs:
       - name: Install the static client
         run: pip3 install --force --no-deps ./py/client/dist/*.whl
 
-      - name: Build cython code
+      - name: Build our Cython code
         env:
           DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
           CPPFLAGS: -I${{ env.DHINSTALL }}/include
diff --git a/.github/workflows/clients-cpp-python-windows.yml b/.github/workflows/clients-cpp-python-windows.yml
index 7a68a336f48..c4cf327c19d 100644
--- a/.github/workflows/clients-cpp-python-windows.yml
+++ b/.github/workflows/clients-cpp-python-windows.yml
@@ -67,7 +67,7 @@ jobs:
       # work and just copy this cached install directory to the output artifact
       # for this run.
 
-      - name: Restore the cached installation directory, or prepare a new one
+      - name: Try to restore cached installdir
         id: cache-cpp-install
         uses: actions/cache@v5
         with:
@@ -125,7 +125,8 @@ jobs:
         run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain ${{ github.workspace }}/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_INSTALL_PREFIX=${{ env.DHINSTALL }} -DX_VCPKG_APPLOCAL_DEPS_INSTALL=ON -DVCPKG_TARGET_TRIPLET=x64-windows-release -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
 
       # [Note: skip this step if cache-cpp-install was successful]
-      # Build our executables and install them in the configured install directory {{ env.DHINSTALL }}
+      # Build our executables and install them in the configured install
+      # directory {{ env.DHINSTALL }}
 
       - name: "Build and install"
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
@@ -180,7 +181,8 @@ jobs:
           cd .\py\client
           python setup.py bdist_wheel
 
-      # Upload .whl file as build artifact, to be used directly or by dependent clients like Python ticking
+      # Upload .whl file as build artifact, to be used directly or by
+      # dependent clients like Python ticking
       - name: Upload .whl file
         uses: actions/upload-artifact@v7
         with:
@@ -240,7 +242,7 @@ jobs:
       - name: set up PATH for cl.exe
         uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756
 
-      - name: Build our Cython
+      - name: Build our Cython code
         env:
           DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
         run: |
diff --git a/.github/workflows/clients-csharp.yml b/.github/workflows/clients-csharp.yml
index 4883c919830..eb34031f535 100644
--- a/.github/workflows/clients-csharp.yml
+++ b/.github/workflows/clients-csharp.yml
@@ -1,4 +1,4 @@
-name: "C# Client-ubu24"
+name: "C# Client on Ubuntu24"
 on:
   pull_request:
     branches: [ 'main', 'rc/v*' ]

From 25c7a011647b5744f77d42002231d9984be38c2e Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 15:25:39 -0400
Subject: [PATCH 08/39] try unified

---
 .github/workflows/clients-cpp-python-ubuntu2404.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/clients-cpp-python-ubuntu2404.yml b/.github/workflows/clients-cpp-python-ubuntu2404.yml
index 29a39066a5a..28ba6013b0b 100644
--- a/.github/workflows/clients-cpp-python-ubuntu2404.yml
+++ b/.github/workflows/clients-cpp-python-ubuntu2404.yml
@@ -246,7 +246,7 @@ jobs:
           cd ./py/client
           pip3 install -r requirements-dev.txt
 
-      - name: Install the static client
+      - name: Install static client
         run: pip3 install --force --no-deps ./py/client/dist/*.whl
 
       - name: Build our Cython code

From c2c33343a1b92ecfbd72edd1c85b6ee132f13626 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 15:31:48 -0400
Subject: [PATCH 09/39] Let's watch this crash and burn

---
 .github/workflows/clients-cpp-python.yml | 276 +++++++++++++++++++++++
 1 file changed, 276 insertions(+)
 create mode 100644 .github/workflows/clients-cpp-python.yml

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
new file mode 100644
index 00000000000..5d504c62ece
--- /dev/null
+++ b/.github/workflows/clients-cpp-python.yml
@@ -0,0 +1,276 @@
+name: "C++/Python"
+on:
+  pull_request:
+    branches: [ 'main', 'rc/v*' ]
+  push:
+    branches: [ 'main', 'check/**', 'release/v*' ]
+permissions:
+  packages: write
+
+#===============================================================================
+# Background: in this workflow there are three different kinds of caching going
+# on:
+#
+# 1. The outputs are Github Build artifacts, attached to every action run.
+#    These artifacts can be downloaded from e.g.
+#    https://github.com/deephaven/deephaven-core/actions/runs/17416308139
+#    but the specific URL depends on the build.
+#    We use this to upload:
+#    - The C++ install directory
+#    - The .whl file for the static Python client
+#    - The .whl file for the ticking Python client
+#
+# 2. The C++ install directory is cached via actions/cache, and keyed
+#    by the hash of the cpp-client and proto directories. This allows us
+#    to skip recompilation if these files don't change. This is an optional
+#    optimization that might not be very significant.
+#
+# 3. Github Packages, which is a NuGet-compatible repo accessible from
+#    https://github.com/orgs/deephaven/packages?repo_name=deephaven-core
+#    and controlled via the NuGet API. We use this package repository to hold
+#    the binaries for the C++ dependencies e build (grpc, arrow, etc.). It is
+#    managed automatically for us by cmake/vcpkg/nuget. This optimization is
+#    important because building the C++ dependencies takes significant time
+#    (45 minutes maybe).
+#===============================================================================
+
+env:
+  GH_PACKAGES_USERNAME: ${{ github.repository_owner }}
+  GH_PACKAGES_FEED: https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json
+  DHINSTALL: ${{ github.workspace }}/dhinstall
+
+jobs:
+  #=============================================================================
+  # Identify version of Deephaven Core
+  #=============================================================================
+  version_job:
+    uses: ./.github/workflows/dhc-version.yml
+
+  #=============================================================================
+  # Build the C++ Client
+  #=============================================================================
+  cpp_job:
+    name: "Build C++ (or use cache)"
+    runs-on: ubuntu-24.04
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+      - name: Check out this repo
+        uses: actions/checkout@v6
+
+      # Try to fetch the whole installation directory (the final product of the
+      # build) from the Github Cache. The key to this cache is derived
+      # from the hash of the contents of the files in the cpp-client and proto
+      # directories. If this fetch is successful, we skip over all the build
+      # work and just copy this cached install directory to the output artifact
+      # for this run.
+
+      - name: Try to restore cached installdir
+        id: cache-cpp-install
+        uses: actions/cache@v5
+        with:
+          path: ${{ env.DHINSTALL }}
+          key: ${{ runner.os }}-cpp-client-${{ hashFiles('cpp-client/**', 'proto/**') }}
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Check out vcpkg
+
+      - name: Check out vcpkg
+        id: checkout-vcpkg
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        uses: actions/checkout@v6
+        with:
+          repository: microsoft/vcpkg
+          path: vcpkg
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Bootstrap vcpkg
+
+      - name: Bootstrap vcpkg
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: ${{ github.workspace }}/vcpkg/bootstrap-vcpkg.sh
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Get mono so that we can run nuget. This is because the nuget.exe that
+      # ships with vcpkg is an old .NET Framework binary (Windows format), and
+      # only mono knows how to run such a thing on Linux. Some day the maintainers
+      # will fix this so it runs with the cross-platform "dotnet".
+
+      - name: Get mono so that we can run nuget
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: sudo apt install mono-complete
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Adapted from
+      # https://learn.microsoft.com/en-us/vcpkg/consume/binary-caching-github-packages?pivots=linux-runner
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Configure nuget to know how to download (or upload) each cached
+      # package that we need (or create)
+
+      - name: "Configure nuget"
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: |
+          vcpkg_exe=${{ github.workspace }}/vcpkg/vcpkg
+          nuget_dotnet=$($vcpkg_exe fetch nuget | tail -n 1)
+          mono $nuget_dotnet \
+            sources add \
+            -Source "${{ env.GH_PACKAGES_FEED }}" \
+            -StorePasswordInClearText \
+            -Name GitHubPackages \
+            -UserName "${{ env.GH_PACKAGES_USERNAME }}" \
+            -Password "${{ secrets.GITHUB_TOKEN }}"
+          mono $nuget_dotnet \
+            setapikey "${{ secrets.GITHUB_TOKEN }}" \
+            -Source "${{ env.GH_PACKAGES_FEED }}"
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Build packages and configure cmake. Check nupkg cache for existing
+      # packages, otherwise build and upload.
+      # 1. Invoke vcpkg to:
+      #    a) Try to fetch each of the dependent libraries from the nuget cache
+      #    b) If not found, build them and insert them in the nuget cache
+      # 2. Configure cmake to prepare for the build/install step, which comes next
+
+      - name: "Build/cache dependencies"
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        env:
+          VCPKG_BINARY_SOURCES: "clear;nuget,${{ env.GH_PACKAGES_FEED }},readwrite"
+        run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain ${{ github.workspace }}/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_INSTALL_PREFIX=${{ env.DHINSTALL }} -DVCPKG_TARGET_TRIPLET=x64-linux-dynamic-release -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
+
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Build our executables and install them in the configured install
+      # directory {{ env.DHINSTALL }}
+
+      - name: Build and install
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: cmake --build cpp-client/deephaven/build --config RelWithDebInfo --target install --parallel
+
+      # Upload results as build artifact. Note: if cache-cpp-install was
+      # then none of the intervening steps were executed. In that case,
+      # this effectively just copies the cache to the build artifact.
+
+      - name: Upload install dir
+        id: upload-install-directory
+        uses: actions/upload-artifact@v7
+        with:
+          name: cpp-client-install
+          path: ${{ env.DHINSTALL }}
+
+  #=============================================================================
+  # Build the Python Static Client
+  #=============================================================================
+
+  python_static_job:
+    name: Python static
+    runs-on: ubuntu-24.04
+    needs: [version_job]
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+      - name: Check out this repo
+        uses: actions/checkout@v6
+
+      - name: Install Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.10'
+
+      - name: Install the 'wheel' package
+        run: pip3 install wheel
+
+      - name: Install requirements-dev.txt
+        run: |
+          cd ./py/client
+          pip3 install -r requirements-dev.txt
+
+      - name: Run setup.py
+        env:
+          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
+        run: |
+          cd ./py/client
+          python setup.py bdist_wheel
+
+      # Upload static .whl file as build artifact, to be used directly or by          # dependent clients like Python ticking
+      - name: Upload .whl file
+        uses: actions/upload-artifact@v7
+        with:
+          name: py-static-wheel
+          path: ./py/client/dist/*.whl
+
+  #=============================================================================
+  # Build the Python Ticking Client
+  #=============================================================================
+
+  python_ticking_job:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-24.04, windows-2025]
+    name: Python ticking
+    runs-on: ${{ matrix.os }}
+    needs: [cpp_job, python_static_job, version_job]
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+      - name: Check out this repo
+        uses: actions/checkout@v6
+
+      # Get the C++ installation as a build artifact
+      - name: Fetch C++ installation
+        uses: actions/download-artifact@v8
+        with:
+          name: cpp-client-install-${{ matrix.os }}
+          path: ${{ env.DHINSTALL }}
+
+
+      # Get the Python static installation as a build artifact
+      - name: Fetch Python static installation
+        uses: actions/download-artifact@v8
+        with:
+          name: py-static-wheel
+          path: ./py/client/dist/
+
+      - name: Install Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.10'
+
+      - name: Install the 'wheel' and 'cython' packages
+        run: pip3 install wheel cython
+
+      - name: Install requirements-dev.txt
+        run: |
+          cd ./py/client
+          pip3 install -r requirements-dev.txt
+
+      - name: Install static client
+        run: pip3 install --force --no-deps ./py/client/dist/*.whl
+
+      - name: Build our Cython code
+        env:
+          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
+          CPPFLAGS: -I${{ env.DHINSTALL }}/include
+          LDFLAGS: -L${{ env.DHINSTALL }}/lib
+        run: |
+          cd ./py/client-ticking
+          python setup.py build_ext -i
+
+      - name: Run setup.py
+        env:
+          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
+        run: |
+          cd ./py/client-ticking
+          python setup.py bdist_wheel
+
+      - name: Upload ticking .whl file as build artifact
+        uses: actions/upload-artifact@v7
+        with:
+          name: py-ticking-wheel-${{ matrix.os }}
+          path: ./py/client-ticking/dist/*.whl

From 300521baed09f38add43e24b661458c46c983eac Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 15:41:55 -0400
Subject: [PATCH 10/39] ok this is going to be UGLY

---
 .github/workflows/clients-cpp-python.yml | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 5d504c62ece..5d62f23c50d 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -51,9 +51,14 @@ jobs:
   #=============================================================================
   cpp_job:
     name: "Build C++ (or use cache)"
-    runs-on: ubuntu-24.04
+    strategy:
+      matrix:
+        os: [ubuntu-24.04, windows-2022]
+      fail-fast: false
+    runs-on: ${{ matrix.os }}
     defaults:
       run:
+        # This gets you Cygwin on Windows
         shell: bash
 
     steps:
@@ -92,21 +97,21 @@ jobs:
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         run: ${{ github.workspace }}/vcpkg/bootstrap-vcpkg.sh
 
+      # [Note: Linux only]
       # [Note: skip this step if cache-cpp-install was successful]
       # Get mono so that we can run nuget. This is because the nuget.exe that
       # ships with vcpkg is an old .NET Framework binary (Windows format), and
       # only mono knows how to run such a thing on Linux. Some day the maintainers
       # will fix this so it runs with the cross-platform "dotnet".
 
-      - name: Get mono so that we can run nuget
+      - name: Install mono
+        if: runner.os == 'Linux'
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         run: sudo apt install mono-complete
 
       # [Note: skip this step if cache-cpp-install was successful]
       # Adapted from
       # https://learn.microsoft.com/en-us/vcpkg/consume/binary-caching-github-packages?pivots=linux-runner
-
-      # [Note: skip this step if cache-cpp-install was successful]
       # Configure nuget to know how to download (or upload) each cached
       # package that we need (or create)
 
@@ -156,11 +161,11 @@ jobs:
         id: upload-install-directory
         uses: actions/upload-artifact@v7
         with:
-          name: cpp-client-install
+          name: cpp-client-install-${{ matrix.os }}
           path: ${{ env.DHINSTALL }}
 
   #=============================================================================
-  # Build the Python Static Client
+  # Build the Python Static Client (not OS dependent)
   #=============================================================================
 
   python_static_job:
@@ -203,14 +208,14 @@ jobs:
           path: ./py/client/dist/*.whl
 
   #=============================================================================
-  # Build the Python Ticking Client
+  # Build the Python Ticking Client (OS dependent)
   #=============================================================================
 
   python_ticking_job:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04, windows-2025]
+        os: [ubuntu-24.04, windows-2025-vs2026]
     name: Python ticking
     runs-on: ${{ matrix.os }}
     needs: [cpp_job, python_static_job, version_job]

From 1b42285f234bef74c56a83b5560fc1bc49358edf Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 15:43:44 -0400
Subject: [PATCH 11/39] let's try this again -- I can't see what is what

---
 .github/workflows/clients-cpp-python.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 5d62f23c50d..b0360b56ec9 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -1,4 +1,4 @@
-name: "C++/Python"
+name: "PARTY TIME C++/Python"
 on:
   pull_request:
     branches: [ 'main', 'rc/v*' ]

From daf12d8983c02195bcd2f96ade5a9bfcaee1bb22 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 15:48:25 -0400
Subject: [PATCH 12/39] oops can't have two "ifs"

---
 .github/workflows/clients-cpp-python.yml | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index b0360b56ec9..3350369d074 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -105,8 +105,7 @@ jobs:
       # will fix this so it runs with the cross-platform "dotnet".
 
       - name: Install mono
-        if: runner.os == 'Linux'
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        if: runner.os == 'Linux' && steps.cache-cpp-install.outputs.cache-hit != 'true'
         run: sudo apt install mono-complete
 
       # [Note: skip this step if cache-cpp-install was successful]

From 310aa4b4c216fe2f0d42837879b65c0ace2b53ea Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 15:53:05 -0400
Subject: [PATCH 13/39] unify windows versions ok?

---
 .github/workflows/clients-cpp-python.yml | 2 +-
 .github/workflows/clients-csharp.yml     | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 3350369d074..25930fb7c5a 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -53,7 +53,7 @@ jobs:
     name: "Build C++ (or use cache)"
     strategy:
       matrix:
-        os: [ubuntu-24.04, windows-2022]
+        os: [ubuntu-24.04, windows-2025-vs2026]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     defaults:
diff --git a/.github/workflows/clients-csharp.yml b/.github/workflows/clients-csharp.yml
index eb34031f535..a9200a71f52 100644
--- a/.github/workflows/clients-csharp.yml
+++ b/.github/workflows/clients-csharp.yml
@@ -20,10 +20,10 @@ jobs:
     uses: ./.github/workflows/dhc-version.yml
     
   #=============================================================================
-  # Build the .NET Client
+  # Build the .NET Client (cross-platform, but we use the Ubuntu runner)
   #=============================================================================
   dotnet_job:
-    name: Build .NET client on Ubuntu
+    name: Build .NET client
     runs-on: ubuntu-24.04
     needs: version_job
     defaults:

From 804fb3b946ebf8d7a2cd07c6a711cea864496f76 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 16:08:51 -0400
Subject: [PATCH 14/39] not dead yet

---
 .github/workflows/clients-cpp-python.yml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 25930fb7c5a..39d8a770111 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -257,6 +257,11 @@ jobs:
       - name: Install static client
         run: pip3 install --force --no-deps ./py/client/dist/*.whl
 
+      # Pinned to a specific SHA to avoid future surprises
+      - name: set up PATH for cl.exe
+        if: runner.os == 'Windows'
+        uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756
+
       - name: Build our Cython code
         env:
           DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}

From c5e765cdfab403010ad037f76f0f6d936e194ee0 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 16:16:40 -0400
Subject: [PATCH 15/39] if this doesn't work, we will hardcode

---
 .github/workflows/clients-cpp-python.yml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 39d8a770111..c506ae36df5 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -233,7 +233,6 @@ jobs:
           name: cpp-client-install-${{ matrix.os }}
           path: ${{ env.DHINSTALL }}
 
-
       # Get the Python static installation as a build artifact
       - name: Fetch Python static installation
         uses: actions/download-artifact@v8
@@ -259,8 +258,9 @@ jobs:
 
       # Pinned to a specific SHA to avoid future surprises
       - name: set up PATH for cl.exe
-        if: runner.os == 'Windows'
-        uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756
+        # if: runner.os == 'Windows'
+        # uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756
+        uses: ilammy/msvc-dev-cmd@v1
 
       - name: Build our Cython code
         env:

From 2b083d6e02f931bd80c4ae388b51df8ac55c78de Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 16:24:16 -0400
Subject: [PATCH 16/39] HACK JOB 666

---
 .github/workflows/clients-cpp-python.yml | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index c506ae36df5..14f15bf5621 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -258,11 +258,11 @@ jobs:
 
       # Pinned to a specific SHA to avoid future surprises
       - name: set up PATH for cl.exe
-        # if: runner.os == 'Windows'
-        # uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756
-        uses: ilammy/msvc-dev-cmd@v1
+        if: runner.os == 'Windows'
+        uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756
 
-      - name: Build our Cython code
+      - name: Build our Cython code (Linux)
+        if: runner.os == 'Linux'
         env:
           DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
           CPPFLAGS: -I${{ env.DHINSTALL }}/include
@@ -271,6 +271,15 @@ jobs:
           cd ./py/client-ticking
           python setup.py build_ext -i
 
+      - name: Build our Cython code (Windows)
+        if: runner.os == 'Windows'
+        shell: cmd
+        env:
+          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
+        run: |
+          cd .\py\client-ticking
+          python setup.py build_ext -i
+
       - name: Run setup.py
         env:
           DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}

From f9f2b4b11f473c7ef85d70be4f0f983b413675cd Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 16:30:42 -0400
Subject: [PATCH 17/39] zamboni time 12456666666

---
 .github/workflows/clients-cpp-python-ubuntu2404.yml | 9 +++++----
 .github/workflows/clients-cpp-python-windows.yml    | 9 +++++----
 .github/workflows/clients-cpp-python.yml            | 7 +------
 3 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/.github/workflows/clients-cpp-python-ubuntu2404.yml b/.github/workflows/clients-cpp-python-ubuntu2404.yml
index 28ba6013b0b..98899f1ff01 100644
--- a/.github/workflows/clients-cpp-python-ubuntu2404.yml
+++ b/.github/workflows/clients-cpp-python-ubuntu2404.yml
@@ -1,9 +1,10 @@
 name: "C++/Python on Ubuntu24"
 on:
-  pull_request:
-    branches: [ 'main', 'rc/v*' ]
-  push:
-    branches: [ 'main', 'check/**', 'release/v*' ]
+  workflow_dispatch:
+#  pull_request:
+#    branches: [ 'main', 'rc/v*' ]
+#  push:
+#    branches: [ 'main', 'check/**', 'release/v*' ]
 permissions:
   packages: write
 
diff --git a/.github/workflows/clients-cpp-python-windows.yml b/.github/workflows/clients-cpp-python-windows.yml
index c4cf327c19d..e0ff4247d6d 100644
--- a/.github/workflows/clients-cpp-python-windows.yml
+++ b/.github/workflows/clients-cpp-python-windows.yml
@@ -1,9 +1,10 @@
 name: "C++/Python on Windows"
 on:
-  pull_request:
-    branches: [ 'main', 'rc/v*' ]
-  push:
-    branches: [ 'main', 'check/**', 'release/v*' ]
+  workflow_dispatch:
+#  pull_request:
+#    branches: [ 'main', 'rc/v*' ]
+#  push:
+#    branches: [ 'main', 'check/**', 'release/v*' ]
 permissions:
   packages: write
 
diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 14f15bf5621..dc14f6037e0 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -270,6 +270,7 @@ jobs:
         run: |
           cd ./py/client-ticking
           python setup.py build_ext -i
+          python setup.py bdist_wheel
 
       - name: Build our Cython code (Windows)
         if: runner.os == 'Windows'
@@ -279,12 +280,6 @@ jobs:
         run: |
           cd .\py\client-ticking
           python setup.py build_ext -i
-
-      - name: Run setup.py
-        env:
-          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
-        run: |
-          cd ./py/client-ticking
           python setup.py bdist_wheel
 
       - name: Upload ticking .whl file as build artifact

From d3f29a22a424f7dfecdbd0cfe2f209df60a6962c Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 17:21:57 -0400
Subject: [PATCH 18/39] tv and ps3 and xbox

---
 .../clients-cpp-python-ubuntu2404.yml         | 273 ------------------
 .../workflows/clients-cpp-python-windows.yml  | 264 -----------------
 cpp-client/CHANGE_COOKIE.txt                  |   1 +
 3 files changed, 1 insertion(+), 537 deletions(-)
 delete mode 100644 .github/workflows/clients-cpp-python-ubuntu2404.yml
 delete mode 100644 .github/workflows/clients-cpp-python-windows.yml
 create mode 100644 cpp-client/CHANGE_COOKIE.txt

diff --git a/.github/workflows/clients-cpp-python-ubuntu2404.yml b/.github/workflows/clients-cpp-python-ubuntu2404.yml
deleted file mode 100644
index 98899f1ff01..00000000000
--- a/.github/workflows/clients-cpp-python-ubuntu2404.yml
+++ /dev/null
@@ -1,273 +0,0 @@
-name: "C++/Python on Ubuntu24"
-on:
-  workflow_dispatch:
-#  pull_request:
-#    branches: [ 'main', 'rc/v*' ]
-#  push:
-#    branches: [ 'main', 'check/**', 'release/v*' ]
-permissions:
-  packages: write
-
-#===============================================================================
-# Background: in this workflow there are three different kinds of caching going
-# on:
-#
-# 1. The outputs are Github Build artifacts, attached to every action run.
-#    These artifacts can be downloaded from e.g.
-#    https://github.com/deephaven/deephaven-core/actions/runs/17416308139
-#    but the specific URL depends on the build.
-#    We use this to upload:
-#    - The C++ install directory
-#    - The .whl file for the static Python client
-#    - The .whl file for the ticking Python client
-#
-# 2. The C++ install directory is cached via actions/cache, and keyed
-#    by the hash of the cpp-client and proto directories. This allows us
-#    to skip recompilation if these files don't change. This is an optional
-#    optimization that might not be very significant.
-#
-# 3. Github Packages, which is a NuGet-compatible repo accessible from
-#    https://github.com/orgs/deephaven/packages?repo_name=deephaven-core
-#    and controlled via the NuGet API. We use this package repository to hold
-#    the binaries for the C++ dependencies e build (grpc, arrow, etc.). It is
-#    managed automatically for us by cmake/vcpkg/nuget. This optimization is
-#    important because building the C++ dependencies takes significant time
-#    (45 minutes maybe).
-#===============================================================================
-
-env:
-  GH_PACKAGES_USERNAME: ${{ github.repository_owner }}
-  GH_PACKAGES_FEED: https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json
-  DHINSTALL: ${{ github.workspace }}/dhinstall
-
-jobs:
-  #=============================================================================
-  # Identify version of Deephaven Core
-  #=============================================================================
-  version_job:
-    uses: ./.github/workflows/dhc-version.yml
-
-  #=============================================================================
-  # Build the C++ Client
-  #=============================================================================
-  cpp_job:
-    name: "Build C++ (or use cache)"
-    runs-on: ubuntu-24.04
-    defaults:
-      run:
-        shell: bash
-
-    steps:
-      - name: Check out this repo
-        uses: actions/checkout@v6
-
-      # Try to fetch the whole installation directory (the final product of the
-      # build) from the Github Cache. The key to this cache is derived
-      # from the hash of the contents of the files in the cpp-client and proto
-      # directories. If this fetch is successful, we skip over all the build
-      # work and just copy this cached install directory to the output artifact
-      # for this run.
-
-      - name: Try to restore cached installdir
-        id: cache-cpp-install
-        uses: actions/cache@v5
-        with:
-          path: ${{ env.DHINSTALL }}
-          key: ${{ runner.os }}-cpp-client-${{ hashFiles('cpp-client/**', 'proto/**') }}
-
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Check out vcpkg
-
-      - name: Check out vcpkg
-        id: checkout-vcpkg
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        uses: actions/checkout@v6
-        with:
-          repository: microsoft/vcpkg
-          path: vcpkg
-
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Bootstrap vcpkg
-
-      - name: Bootstrap vcpkg
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        run: ${{ github.workspace }}/vcpkg/bootstrap-vcpkg.sh
-
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Get mono so that we can run nuget. This is because the nuget.exe that
-      # ships with vcpkg is an old .NET Framework binary (Windows format), and
-      # only mono knows how to run such a thing on Linux. Some day the maintainers
-      # will fix this so it runs with the cross-platform "dotnet".
-
-      - name: Get mono so that we can run nuget
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        run: sudo apt install mono-complete
-
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Adapted from
-      # https://learn.microsoft.com/en-us/vcpkg/consume/binary-caching-github-packages?pivots=linux-runner
-
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Configure nuget to know how to download (or upload) each cached
-      # package that we need (or create)
-
-      - name: "Configure nuget"
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        run: |
-          vcpkg_exe=${{ github.workspace }}/vcpkg/vcpkg
-          nuget_dotnet=$($vcpkg_exe fetch nuget | tail -n 1)
-          mono $nuget_dotnet \
-            sources add \
-            -Source "${{ env.GH_PACKAGES_FEED }}" \
-            -StorePasswordInClearText \
-            -Name GitHubPackages \
-            -UserName "${{ env.GH_PACKAGES_USERNAME }}" \
-            -Password "${{ secrets.GITHUB_TOKEN }}"
-          mono $nuget_dotnet \
-            setapikey "${{ secrets.GITHUB_TOKEN }}" \
-            -Source "${{ env.GH_PACKAGES_FEED }}"
-
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Build packages and configure cmake. Check nupkg cache for existing
-      # packages, otherwise build and upload.
-      # 1. Invoke vcpkg to:
-      #    a) Try to fetch each of the dependent libraries from the nuget cache
-      #    b) If not found, build them and insert them in the nuget cache
-      # 2. Configure cmake to prepare for the build/install step, which comes next
-
-      - name: "Build/cache dependencies"
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        env:
-          VCPKG_BINARY_SOURCES: "clear;nuget,${{ env.GH_PACKAGES_FEED }},readwrite"
-        run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain ${{ github.workspace }}/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_INSTALL_PREFIX=${{ env.DHINSTALL }} -DVCPKG_TARGET_TRIPLET=x64-linux-dynamic-release -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
-
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Build our executables and install them in the configured install
-      # directory {{ env.DHINSTALL }}
-
-      - name: Build and install
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        run: cmake --build cpp-client/deephaven/build --config RelWithDebInfo --target install --parallel
-
-      # Upload results as build artifact. Note: if cache-cpp-install was
-      # then none of the intervening steps were executed. In that case,
-      # this effectively just copies the cache to the build artifact.
-
-      - name: Upload install dir
-        id: upload-install-directory
-        uses: actions/upload-artifact@v7
-        with:
-          name: cpp-client-install
-          path: ${{ env.DHINSTALL }}
-
-  #=============================================================================
-  # Build the Python Static Client
-  #=============================================================================
-
-  python_static_job:
-    name: Python static
-    runs-on: ubuntu-24.04
-    needs: [version_job]
-    defaults:
-      run:
-        shell: bash
-
-    steps:
-      - name: Check out this repo
-        uses: actions/checkout@v6
-
-      - name: Install Python
-        uses: actions/setup-python@v6
-        with:
-          python-version: '3.10'
-
-      - name: Install the 'wheel' package
-        run: pip3 install wheel
-
-      - name: Install requirements-dev.txt
-        run: |
-          cd ./py/client
-          pip3 install -r requirements-dev.txt
-
-      - name: Run setup.py
-        env:
-          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
-        run: |
-          cd ./py/client
-          python setup.py bdist_wheel
-
-      # Upload static .whl file as build artifact, to be used directly or by          # dependent clients like Python ticking
-      - name: Upload .whl file
-        uses: actions/upload-artifact@v7
-        with:
-          name: py-static-wheel
-          path: ./py/client/dist/*.whl
-
-  #=============================================================================
-  # Build the Python Ticking Client
-  #=============================================================================
-
-  python_ticking_job:
-    name: Python ticking
-    runs-on: ubuntu-24.04
-    needs: [cpp_job, python_static_job, version_job]
-    defaults:
-      run:
-        shell: bash
-
-    steps:
-      - name: Check out this repo
-        uses: actions/checkout@v6
-
-      # Get the C++ installation as a build artifact
-      - name: Fetch C++ installation
-        uses: actions/download-artifact@v8
-        with:
-          name: cpp-client-install
-          path: ${{ env.DHINSTALL }}
-
-
-      # Get the Python static installation as a build artifact
-      - name: Fetch Python static installation
-        uses: actions/download-artifact@v8
-        with:
-          name: py-static-wheel
-          path: ./py/client/dist/
-
-      - name: Install Python
-        uses: actions/setup-python@v6
-        with:
-          python-version: '3.10'
-
-      - name: Install the 'wheel' and 'cython' packages
-        run: pip3 install wheel cython
-
-      - name: Install requirements-dev.txt
-        run: |
-          cd ./py/client
-          pip3 install -r requirements-dev.txt
-
-      - name: Install static client
-        run: pip3 install --force --no-deps ./py/client/dist/*.whl
-
-      - name: Build our Cython code
-        env:
-          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
-          CPPFLAGS: -I${{ env.DHINSTALL }}/include
-          LDFLAGS: -L${{ env.DHINSTALL }}/lib
-        run: |
-          cd ./py/client-ticking
-          python setup.py build_ext -i
-
-      - name: Run setup.py
-        env:
-          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
-        run: |
-          cd ./py/client-ticking
-          python setup.py bdist_wheel
-
-      - name: Upload ticking .whl file as build artifact
-        uses: actions/upload-artifact@v7
-        with:
-          name: py-ticking-wheel
-          path: ./py/client-ticking/dist/*.whl
diff --git a/.github/workflows/clients-cpp-python-windows.yml b/.github/workflows/clients-cpp-python-windows.yml
deleted file mode 100644
index e0ff4247d6d..00000000000
--- a/.github/workflows/clients-cpp-python-windows.yml
+++ /dev/null
@@ -1,264 +0,0 @@
-name: "C++/Python on Windows"
-on:
-  workflow_dispatch:
-#  pull_request:
-#    branches: [ 'main', 'rc/v*' ]
-#  push:
-#    branches: [ 'main', 'check/**', 'release/v*' ]
-permissions:
-  packages: write
-
-#===============================================================================
-# Background: in this workflow there are three different kinds of caching going
-# on:
-#
-# 1. The outputs are Github Build artifacts, attached to every action run.
-#    These artifacts can be downloaded from e.g.
-#    https://github.com/deephaven/deephaven-core/actions/runs/17416308139
-#    but the specific URL depends on the build.
-#    We use this to upload:
-#    - The C++ install directory
-#    - The .whl file for the static Python client
-#    - The .whl file for the ticking Python client
-#
-# 2. The C++ install directory is cached via actions/cache, and keyed
-#    by the hash of the cpp-client and proto directories. This allows us
-#    to skip recompilation if these files don't change. This is an optional
-#    optimization that might not be very significant.
-#
-# 3. Github Packages, which is a NuGet-compatible repo accessible from
-#    https://github.com/orgs/deephaven/packages?repo_name=deephaven-core
-#    and controlled via the NuGet API. We use this package repository to hold
-#    the binaries for the C++ dependencies e build (grpc, arrow, etc.). It is
-#    managed automatically for us by cmake/vcpkg/nuget. This optimization is
-#    important because building the C++ dependencies takes significant time
-#    (45 minutes maybe).
-#===============================================================================
-
-env:
-  GH_PACKAGES_USERNAME: ${{ github.repository_owner }}
-  GH_PACKAGES_FEED: https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json
-  DHINSTALL: ${{ github.workspace }}/dhinstall
-
-jobs:
-  #=============================================================================
-  # Identify version of Deephaven Core
-  #=============================================================================
-  version_job:
-    uses: ./.github/workflows/dhc-version.yml
-
-  #=============================================================================
-  # Build the C++ Client
-  #=============================================================================
-  cpp_job:
-    name: "Build C++ (or use cache)"
-    runs-on: windows-2025
-    defaults:
-      run:
-        shell: cmd
-
-    steps:
-      - name: Check out this repo
-        uses: actions/checkout@v6
-
-      # Try to fetch the whole installation directory (the final product of the
-      # build) from the Github Cache. The key to this cache is derived
-      # from the hash of the contents of the files in the cpp-client and proto
-      # directories. If this fetch is successful, we skip over all the build
-      # work and just copy this cached install directory to the output artifact
-      # for this run.
-
-      - name: Try to restore cached installdir
-        id: cache-cpp-install
-        uses: actions/cache@v5
-        with:
-          path: ${{ env.DHINSTALL }}
-          key: ${{ runner.os }}-cpp-client-${{ hashFiles('cpp-client/**', 'proto/**') }}
-
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Check out vcpkg
-
-      - name: Check out vcpkg
-        id: checkout-vcpkg
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        uses: actions/checkout@v6
-        with:
-          repository: microsoft/vcpkg
-          path: vcpkg
-
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Bootstrap vcpkg
-
-      - name: Bootstrap vcpkg
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        run: ${{ github.workspace }}/vcpkg/bootstrap-vcpkg.bat
-
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Configure nuget to know how to download (or upload) each cached
-      # package that we need (or create)
-      # Adapted from
-      # https://learn.microsoft.com/en-us/vcpkg/consume/binary-caching-github-packages?pivots=linux-runner
-
-      - name: "Configure nuget"
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        shell: pwsh
-        run: |
-          $nuget_exe = & ./vcpkg/vcpkg.exe fetch nuget
-          & $nuget_exe sources add `
-          -Source "${{ env.GH_PACKAGES_FEED }}" `
-          -StorePasswordInClearText `
-          -Name GitHubPackages `
-          -UserName "${{ env.GH_PACKAGES_USERNAME }}" `
-          -Password "${{ secrets.GITHUB_TOKEN }}"
-          & $nuget_exe setapikey "${{ secrets.GITHUB_TOKEN }}" -Source "${{ env.GH_PACKAGES_FEED }}"
-
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Build packages and configure cmake. Check nupkg cache for existing
-      # packages, otherwise build and upload.
-      # 1. Invoke vcpkg to:
-      #    a) Try to fetch each of the dependent libraries from the nuget cache
-      #    b) If not found, build them and insert them in the nuget cache
-      # 2. Configure cmake to prepare for the build/install step, which comes next
-      - name: "Build/cache dependencies"
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        env:
-          VCPKG_BINARY_SOURCES: "clear;nuget,${{ env.GH_PACKAGES_FEED }},readwrite"
-        run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain ${{ github.workspace }}/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_INSTALL_PREFIX=${{ env.DHINSTALL }} -DX_VCPKG_APPLOCAL_DEPS_INSTALL=ON -DVCPKG_TARGET_TRIPLET=x64-windows-release -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
-
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Build our executables and install them in the configured install
-      # directory {{ env.DHINSTALL }}
-
-      - name: "Build and install"
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        run: cmake --build cpp-client/deephaven/build --config RelWithDebInfo --target install --parallel
-
-      # [Note: skip this step if cache-cpp-install was successful]
-
-      # Upload results as build artifact. Note: if cache-cpp-install was
-      # then none of the intervening steps were executed. In that case,
-      # this effectively just copies the cache to the build artifact.
-
-      - name: Upload install dir
-        id: upload-install-directory
-        uses: actions/upload-artifact@v7
-        with:
-          name: cpp-client-install
-          path: ${{ env.DHINSTALL }}
-
-  #=============================================================================
-  # Build the Python Static Client
-  #=============================================================================
-
-  python_static_job:
-    name: Python static
-    runs-on: windows-2025
-    needs: [version_job]
-    defaults:
-      run:
-        shell: cmd
-
-    steps:
-      - name: Check out this repo
-        uses: actions/checkout@v6
-
-      - name: Install Python
-        uses: actions/setup-python@v6
-        with:
-          python-version: '3.10'
-
-      - name: Install 'wheel' package
-        run: pip3 install wheel
-
-      - name: Install requirements-dev.txt
-        run: |
-          cd .\py\client
-          pip3 install -r requirements-dev.txt
-
-      - name: Run setup.py
-        env:
-          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
-        run: |
-          cd .\py\client
-          python setup.py bdist_wheel
-
-      # Upload .whl file as build artifact, to be used directly or by
-      # dependent clients like Python ticking
-      - name: Upload .whl file
-        uses: actions/upload-artifact@v7
-        with:
-          name: py-static-wheel
-          path: ./py/client/dist/*.whl
-
-  #=============================================================================
-  # Build the Python Ticking Client
-  #=============================================================================
-
-  python_ticking_job:
-    name: Python ticking
-    runs-on: windows-2025
-    needs: [cpp_job, python_static_job, version_job]
-    defaults:
-      run:
-        shell: cmd
-
-    steps:
-      - name: Check out this repo
-        uses: actions/checkout@v6
-
-      # Get the C++ installation as a build artifact
-      - name: Fetch C++ installation
-        uses: actions/download-artifact@v8
-        with:
-          name: cpp-client-install
-          path: ${{ env.DHINSTALL }}
-
-      # Get the Python static installation as a build artifact
-      - name: Fetch Python static installation
-        uses: actions/download-artifact@v8
-        with:
-          name: py-static-wheel
-          path: ./py/client/dist/
-
-      - name: Install Python
-        uses: actions/setup-python@v6
-        with:
-          python-version: '3.10'
-
-      - name: "Install the 'wheel' and 'cython' packages"
-        run: pip3 install wheel cython
-
-      - name: Install requirements-dev.txt
-        run: |
-          cd .\py\client
-          pip3 install -r requirements-dev.txt
-
-      - name: Install static client
-        shell: pwsh
-        run: |
-          $wheel = (Get-ChildItem -Path .\py\client\dist\*.whl).FullName
-          pip3 install --force --no-deps $wheel
-
-      # Pinned to a specific SHA to avoid future surprises
-      - name: set up PATH for cl.exe
-        uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756
-
-      - name: Build our Cython code
-        env:
-          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
-        run: |
-          cd .\py\client-ticking
-          python setup.py build_ext -i
-
-      - name: Run setup.py
-        env:
-          DEEPHAVEN_VERSION: ${{ needs.version_job.outputs.dhc_version }}
-        run: |
-          cd .\py\client-ticking
-          python setup.py bdist_wheel
-
-      - name: Upload .whl file
-        uses: actions/upload-artifact@v7
-        with:
-          name: py-ticking-wheel
-          path: ./py/client-ticking/dist/*.whl
diff --git a/cpp-client/CHANGE_COOKIE.txt b/cpp-client/CHANGE_COOKIE.txt
new file mode 100644
index 00000000000..6232bf844ec
--- /dev/null
+++ b/cpp-client/CHANGE_COOKIE.txt
@@ -0,0 +1 @@
+taint the C++ build to cause it to run again or whatever

From 5177b2cd4649c262da523a156c7ca0f26196f337 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 17:28:03 -0400
Subject: [PATCH 19/39] try this hell

---
 .github/workflows/clients-cpp-python.yml | 3 ++-
 .github/workflows/clients-csharp.yml     | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index dc14f6037e0..d421b2b2136 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -37,7 +37,8 @@ permissions:
 env:
   GH_PACKAGES_USERNAME: ${{ github.repository_owner }}
   GH_PACKAGES_FEED: https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json
-  DHINSTALL: ${{ github.workspace }}/dhinstall
+  # DHINSTALL: ${{ github.workspace }}/dhinstall
+  # DHINSTALL: ./dhinstall
 
 jobs:
   #=============================================================================
diff --git a/.github/workflows/clients-csharp.yml b/.github/workflows/clients-csharp.yml
index a9200a71f52..4771d48991f 100644
--- a/.github/workflows/clients-csharp.yml
+++ b/.github/workflows/clients-csharp.yml
@@ -1,4 +1,4 @@
-name: "C# Client on Ubuntu24"
+name: "C# Client"
 on:
   pull_request:
     branches: [ 'main', 'rc/v*' ]

From 7528fdb3dcacd271ac4373a524972092b6438cd4 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 17:28:38 -0400
Subject: [PATCH 20/39] no no trhis

---
 .github/workflows/clients-cpp-python.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index d421b2b2136..3c9ed284e1e 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -38,7 +38,7 @@ env:
   GH_PACKAGES_USERNAME: ${{ github.repository_owner }}
   GH_PACKAGES_FEED: https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json
   # DHINSTALL: ${{ github.workspace }}/dhinstall
-  # DHINSTALL: ./dhinstall
+  DHINSTALL: ./dhinstall
 
 jobs:
   #=============================================================================

From dd1f5e9e6ba9a10ec5a0dc7121fcebb2f56af07b Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 17:33:34 -0400
Subject: [PATCH 21/39] $20,000 / night

---
 .github/workflows/clients-cpp-python.yml | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 3c9ed284e1e..e24b1527482 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -37,8 +37,7 @@ permissions:
 env:
   GH_PACKAGES_USERNAME: ${{ github.repository_owner }}
   GH_PACKAGES_FEED: https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json
-  # DHINSTALL: ${{ github.workspace }}/dhinstall
-  DHINSTALL: ./dhinstall
+  DHINSTALL: ${{ github.workspace }}/dhinstall
 
 jobs:
   #=============================================================================
@@ -94,10 +93,15 @@ jobs:
       # [Note: skip this step if cache-cpp-install was successful]
       # Bootstrap vcpkg
 
-      - name: Bootstrap vcpkg
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+      - name: Bootstrap vcpkg (Linux)
+        if: runner.os == 'Linux' && steps.cache-cpp-install.outputs.cache-hit != 'true'
         run: ${{ github.workspace }}/vcpkg/bootstrap-vcpkg.sh
 
+      - name: Bootstrap vcpkg (Windows)
+        shell: cmd
+        if: runner.os == 'Windows' && steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: ${{ github.workspace }}/vcpkg/bootstrap-vcpkg.bat
+
       # [Note: Linux only]
       # [Note: skip this step if cache-cpp-install was successful]
       # Get mono so that we can run nuget. This is because the nuget.exe that

From 9a3ac71a0c5eefad655d168161a120e950c81077 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 17:36:40 -0400
Subject: [PATCH 22/39] one femto-step at a time

---
 .github/workflows/clients-cpp-python.yml | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index e24b1527482..d5209e7345c 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -119,8 +119,8 @@ jobs:
       # Configure nuget to know how to download (or upload) each cached
       # package that we need (or create)
 
-      - name: "Configure nuget"
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+      - name: "Configure nuget (Linux)"
+        if: runner.os == 'Linux' && steps.cache-cpp-install.outputs.cache-hit != 'true'
         run: |
           vcpkg_exe=${{ github.workspace }}/vcpkg/vcpkg
           nuget_dotnet=$($vcpkg_exe fetch nuget | tail -n 1)
@@ -135,6 +135,19 @@ jobs:
             setapikey "${{ secrets.GITHUB_TOKEN }}" \
             -Source "${{ env.GH_PACKAGES_FEED }}"
 
+      - name: "Configure nuget (Windows)"
+        if: runner.os == 'Windows' && steps.cache-cpp-install.outputs.cache-hit != 'true'
+        shell: pwsh
+        run: |
+          $nuget_exe = & ./vcpkg/vcpkg.exe fetch nuget
+          & $nuget_exe sources add `
+          -Source "${{ env.GH_PACKAGES_FEED }}" `
+          -StorePasswordInClearText `
+          -Name GitHubPackages `
+          -UserName "${{ env.GH_PACKAGES_USERNAME }}" `
+          -Password "${{ secrets.GITHUB_TOKEN }}"
+          & $nuget_exe setapikey "${{ secrets.GITHUB_TOKEN }}" -Source "${{ env.GH_PACKAGES_FEED }}"
+
       # [Note: skip this step if cache-cpp-install was successful]
       # Build packages and configure cmake. Check nupkg cache for existing
       # packages, otherwise build and upload.

From 9fddbc39e3664a38730ace01cd942d1faf8a9c05 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 17:45:55 -0400
Subject: [PATCH 23/39] what a hellish mess

---
 .github/workflows/clients-cpp-python.yml | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index d5209e7345c..32f5d8a2ce1 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -1,4 +1,4 @@
-name: "PARTY TIME C++/Python"
+name: "C++/Python"
 on:
   pull_request:
     branches: [ 'main', 'rc/v*' ]
@@ -53,7 +53,12 @@ jobs:
     name: "Build C++ (or use cache)"
     strategy:
       matrix:
-        os: [ubuntu-24.04, windows-2025-vs2026]
+        include:
+          - os: ubuntu-24.04
+            target_triplet: x64-linux-dynamic-release
+          - os: windows-2025-vs2026
+            target-triplet: x64-windows-release
+
       fail-fast: false
     runs-on: ${{ matrix.os }}
     defaults:
@@ -90,6 +95,10 @@ jobs:
           repository: microsoft/vcpkg
           path: vcpkg
 
+      - name: Bootstrap vcpkg (test)
+        if: runner.os == 'Linux' && steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: "$GITHUB_WORKSPACE/vcpkg/bootstrap-vcpkg.sh"
+
       # [Note: skip this step if cache-cpp-install was successful]
       # Bootstrap vcpkg
 
@@ -160,7 +169,7 @@ jobs:
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         env:
           VCPKG_BINARY_SOURCES: "clear;nuget,${{ env.GH_PACKAGES_FEED }},readwrite"
-        run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain ${{ github.workspace }}/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_INSTALL_PREFIX=${{ env.DHINSTALL }} -DVCPKG_TARGET_TRIPLET=x64-linux-dynamic-release -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
+        run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain "$GITHUB_WORKSPACE/vcpkg/scripts/buildsystems/vcpkg.cmake" -DCMAKE_INSTALL_PREFIX=${{ env.DHINSTALL }} -DVCPKG_TARGET_TRIPLET="$TARGET_TRIPLET" -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
 
       # [Note: skip this step if cache-cpp-install was successful]
       # Build our executables and install them in the configured install

From 39588159ecb5f4af37a7376018317869b8eaa19c Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 17:47:56 -0400
Subject: [PATCH 24/39] gakkk

---
 .github/workflows/clients-cpp-python.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 32f5d8a2ce1..490d799a939 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -57,7 +57,7 @@ jobs:
           - os: ubuntu-24.04
             target_triplet: x64-linux-dynamic-release
           - os: windows-2025-vs2026
-            target-triplet: x64-windows-release
+            target_triplet: x64-windows-release
 
       fail-fast: false
     runs-on: ${{ matrix.os }}

From e27b1326b2e960f6930ce06d933b77dcecfab4f1 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 17:56:01 -0400
Subject: [PATCH 25/39] blah

---
 .github/workflows/clients-cpp-python.yml | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 490d799a939..08ed9fb0b26 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -58,7 +58,6 @@ jobs:
             target_triplet: x64-linux-dynamic-release
           - os: windows-2025-vs2026
             target_triplet: x64-windows-release
-
       fail-fast: false
     runs-on: ${{ matrix.os }}
     defaults:
@@ -169,7 +168,7 @@ jobs:
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         env:
           VCPKG_BINARY_SOURCES: "clear;nuget,${{ env.GH_PACKAGES_FEED }},readwrite"
-        run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain "$GITHUB_WORKSPACE/vcpkg/scripts/buildsystems/vcpkg.cmake" -DCMAKE_INSTALL_PREFIX=${{ env.DHINSTALL }} -DVCPKG_TARGET_TRIPLET="$TARGET_TRIPLET" -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
+        run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain "$GITHUB_WORKSPACE/vcpkg/scripts/buildsystems/vcpkg.cmake" -DCMAKE_INSTALL_PREFIX=${{ env.DHINSTALL }} -DVCPKG_TARGET_TRIPLET="${{ matrix.target_triplet }}" -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
 
       # [Note: skip this step if cache-cpp-install was successful]
       # Build our executables and install them in the configured install

From 3df64a06eca1c5f8301e40fb6f03160298b5e71e Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 18:01:26 -0400
Subject: [PATCH 26/39] super blah

---
 .github/workflows/clients-cpp-python.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 08ed9fb0b26..a863102991b 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -62,7 +62,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     defaults:
       run:
-        # This gets you Cygwin on Windows
+        # This gets you Git Bash on Windows
         shell: bash
 
     steps:
@@ -95,7 +95,7 @@ jobs:
           path: vcpkg
 
       - name: Bootstrap vcpkg (test)
-        if: runner.os == 'Linux' && steps.cache-cpp-install.outputs.cache-hit != 'true'
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         run: "$GITHUB_WORKSPACE/vcpkg/bootstrap-vcpkg.sh"
 
       # [Note: skip this step if cache-cpp-install was successful]

From c3c2de0eb518130662182974fc4648536c150899 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 18:02:50 -0400
Subject: [PATCH 27/39] ok confirm this works

---
 .github/workflows/clients-cpp-python.yml | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index a863102991b..4e1b047f5d6 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -94,21 +94,11 @@ jobs:
           repository: microsoft/vcpkg
           path: vcpkg
 
-      - name: Bootstrap vcpkg (test)
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        run: "$GITHUB_WORKSPACE/vcpkg/bootstrap-vcpkg.sh"
-
       # [Note: skip this step if cache-cpp-install was successful]
       # Bootstrap vcpkg
-
-      - name: Bootstrap vcpkg (Linux)
-        if: runner.os == 'Linux' && steps.cache-cpp-install.outputs.cache-hit != 'true'
-        run: ${{ github.workspace }}/vcpkg/bootstrap-vcpkg.sh
-
-      - name: Bootstrap vcpkg (Windows)
-        shell: cmd
-        if: runner.os == 'Windows' && steps.cache-cpp-install.outputs.cache-hit != 'true'
-        run: ${{ github.workspace }}/vcpkg/bootstrap-vcpkg.bat
+      - name: Bootstrap vcpkg
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: "$GITHUB_WORKSPACE/vcpkg/bootstrap-vcpkg.sh"
 
       # [Note: Linux only]
       # [Note: skip this step if cache-cpp-install was successful]

From 34911a7fc9cfe437cbdc02e897fd8693e5026c27 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 18:10:34 -0400
Subject: [PATCH 28/39] godspeed

---
 .github/workflows/clients-cpp-python.yml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 4e1b047f5d6..611f943dc1e 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -94,6 +94,13 @@ jobs:
           repository: microsoft/vcpkg
           path: vcpkg
 
+      - name: Zamboni Time
+        run: |
+          nuget_tool=$("$GITHUB_WORKSPACE/vcpkg/vcpkg" fetch nuget | tail -n 1)
+          echo "Path: $nuget_tool"
+          file "$nuget_tool"
+          ls -la "$nuget_tool"
+
       # [Note: skip this step if cache-cpp-install was successful]
       # Bootstrap vcpkg
       - name: Bootstrap vcpkg

From 2d3e76131d3630d0414c36f5f4179149fa2c8d9a Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 18:11:57 -0400
Subject: [PATCH 29/39] zamboni time 2

---
 .github/workflows/clients-cpp-python.yml | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 611f943dc1e..2b57cf469dc 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -94,6 +94,12 @@ jobs:
           repository: microsoft/vcpkg
           path: vcpkg
 
+      # [Note: skip this step if cache-cpp-install was successful]
+      # Bootstrap vcpkg
+      - name: Bootstrap vcpkg
+        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
+        run: "$GITHUB_WORKSPACE/vcpkg/bootstrap-vcpkg.sh"
+
       - name: Zamboni Time
         run: |
           nuget_tool=$("$GITHUB_WORKSPACE/vcpkg/vcpkg" fetch nuget | tail -n 1)
@@ -101,12 +107,6 @@ jobs:
           file "$nuget_tool"
           ls -la "$nuget_tool"
 
-      # [Note: skip this step if cache-cpp-install was successful]
-      # Bootstrap vcpkg
-      - name: Bootstrap vcpkg
-        if: steps.cache-cpp-install.outputs.cache-hit != 'true'
-        run: "$GITHUB_WORKSPACE/vcpkg/bootstrap-vcpkg.sh"
-
       # [Note: Linux only]
       # [Note: skip this step if cache-cpp-install was successful]
       # Get mono so that we can run nuget. This is because the nuget.exe that

From 37b5b8e1a2f3273056f1ddca5a5d087871fd33eb Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 18:14:28 -0400
Subject: [PATCH 30/39] why am I sad

---
 .github/workflows/clients-cpp-python.yml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 2b57cf469dc..72ba59c6fc2 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -102,6 +102,8 @@ jobs:
 
       - name: Zamboni Time
         run: |
+          echo ls -l "$GITHUB_WORKSPACE/vcpkg/vcpkg"
+          ls -l "$GITHUB_WORKSPACE/vcpkg/vcpkg"
           nuget_tool=$("$GITHUB_WORKSPACE/vcpkg/vcpkg" fetch nuget | tail -n 1)
           echo "Path: $nuget_tool"
           file "$nuget_tool"

From af37011c27feeb9860d11434665bbd7ee23859c9 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 18:16:14 -0400
Subject: [PATCH 31/39] i'll be honest this is pissing me off

---
 .github/workflows/clients-cpp-python.yml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 72ba59c6fc2..bfb0ac9da45 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -102,7 +102,9 @@ jobs:
 
       - name: Zamboni Time
         run: |
-          echo ls -l "$GITHUB_WORKSPACE/vcpkg/vcpkg"
+          echo "$GITHUB_WORKSPACE"
+          ls -l "$GITHUB_WORKSPACE"
+          ls -l "$GITHUB_WORKSPACE/vcpkg"
           ls -l "$GITHUB_WORKSPACE/vcpkg/vcpkg"
           nuget_tool=$("$GITHUB_WORKSPACE/vcpkg/vcpkg" fetch nuget | tail -n 1)
           echo "Path: $nuget_tool"

From a23011a6190f0d07c467170eab970c3a8bbd40f4 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 18:16:30 -0400
Subject: [PATCH 32/39] thi s too

---
 .github/workflows/clients-cpp-python.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index bfb0ac9da45..3f095f7d5f3 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -106,6 +106,7 @@ jobs:
           ls -l "$GITHUB_WORKSPACE"
           ls -l "$GITHUB_WORKSPACE/vcpkg"
           ls -l "$GITHUB_WORKSPACE/vcpkg/vcpkg"
+          $GITHUB_WORKSPACE/vcpkg/vcpkg
           nuget_tool=$("$GITHUB_WORKSPACE/vcpkg/vcpkg" fetch nuget | tail -n 1)
           echo "Path: $nuget_tool"
           file "$nuget_tool"

From eba194ff9dda8a656e165723214d5e4c34a019a4 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 18:17:10 -0400
Subject: [PATCH 33/39] might as well go all the way

---
 .github/workflows/clients-cpp-python.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 3f095f7d5f3..b6067479e90 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -107,6 +107,7 @@ jobs:
           ls -l "$GITHUB_WORKSPACE/vcpkg"
           ls -l "$GITHUB_WORKSPACE/vcpkg/vcpkg"
           $GITHUB_WORKSPACE/vcpkg/vcpkg
+          $GITHUB_WORKSPACE/vcpkg/vcpkg fetch nuget
           nuget_tool=$("$GITHUB_WORKSPACE/vcpkg/vcpkg" fetch nuget | tail -n 1)
           echo "Path: $nuget_tool"
           file "$nuget_tool"

From c1e61f0ea1cf28370f37be42ed4d7aaa7a6f2f75 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 18:19:18 -0400
Subject: [PATCH 34/39] the final ultimatum

---
 .github/workflows/clients-cpp-python.yml | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index b6067479e90..d05dd1b7f50 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -102,12 +102,8 @@ jobs:
 
       - name: Zamboni Time
         run: |
-          echo "$GITHUB_WORKSPACE"
-          ls -l "$GITHUB_WORKSPACE"
-          ls -l "$GITHUB_WORKSPACE/vcpkg"
-          ls -l "$GITHUB_WORKSPACE/vcpkg/vcpkg"
-          $GITHUB_WORKSPACE/vcpkg/vcpkg
-          $GITHUB_WORKSPACE/vcpkg/vcpkg fetch nuget
+          echo "$GITHUB_WORKSPACE/vcpkg/vcpkg" fetch nuget
+          "$GITHUB_WORKSPACE/vcpkg/vcpkg" fetch nuget
           nuget_tool=$("$GITHUB_WORKSPACE/vcpkg/vcpkg" fetch nuget | tail -n 1)
           echo "Path: $nuget_tool"
           file "$nuget_tool"

From 1a07d2880d3962b7fe5e19ad54a6040fc4417d6c Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 18:27:54 -0400
Subject: [PATCH 35/39] now try this version

---
 .github/workflows/clients-cpp-python.yml | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index d05dd1b7f50..7950768306c 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -96,25 +96,17 @@ jobs:
 
       # [Note: skip this step if cache-cpp-install was successful]
       # Bootstrap vcpkg
+
       - name: Bootstrap vcpkg
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         run: "$GITHUB_WORKSPACE/vcpkg/bootstrap-vcpkg.sh"
 
-      - name: Zamboni Time
-        run: |
-          echo "$GITHUB_WORKSPACE/vcpkg/vcpkg" fetch nuget
-          "$GITHUB_WORKSPACE/vcpkg/vcpkg" fetch nuget
-          nuget_tool=$("$GITHUB_WORKSPACE/vcpkg/vcpkg" fetch nuget | tail -n 1)
-          echo "Path: $nuget_tool"
-          file "$nuget_tool"
-          ls -la "$nuget_tool"
-
       # [Note: Linux only]
       # [Note: skip this step if cache-cpp-install was successful]
       # Get mono so that we can run nuget. This is because the nuget.exe that
       # ships with vcpkg is an old .NET Framework binary (Windows format), and
-      # only mono knows how to run such a thing on Linux. Some day the maintainers
-      # will fix this so it runs with the cross-platform "dotnet".
+      # only mono knows how to run such a thing on Linux. Some day the
+      # maintainers will fix this so it runs with the cross-platform "dotnet".
 
       - name: Install mono
         if: runner.os == 'Linux' && steps.cache-cpp-install.outputs.cache-hit != 'true'
@@ -167,7 +159,7 @@ jobs:
         if: steps.cache-cpp-install.outputs.cache-hit != 'true'
         env:
           VCPKG_BINARY_SOURCES: "clear;nuget,${{ env.GH_PACKAGES_FEED }},readwrite"
-        run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain "$GITHUB_WORKSPACE/vcpkg/scripts/buildsystems/vcpkg.cmake" -DCMAKE_INSTALL_PREFIX=${{ env.DHINSTALL }} -DVCPKG_TARGET_TRIPLET="${{ matrix.target_triplet }}" -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
+        run: cmake -S cpp-client/deephaven -B cpp-client/deephaven/build --toolchain "$GITHUB_WORKSPACE/vcpkg/scripts/buildsystems/vcpkg.cmake" -DCMAKE_INSTALL_PREFIX="$DHINSTALL" -DVCPKG_TARGET_TRIPLET="${{ matrix.target_triplet }}" -DVCPKG_OVERLAY_TRIPLETS=cpp-client/deephaven/custom-triplets
 
       # [Note: skip this step if cache-cpp-install was successful]
       # Build our executables and install them in the configured install

From 41c05aa04536661366ebaf213564534bb27e6ee1 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 18:50:41 -0400
Subject: [PATCH 36/39] arg one more painful change

---
 .github/workflows/clients-cpp-python.yml | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 7950768306c..98280e2921e 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -5,7 +5,7 @@ on:
   push:
     branches: [ 'main', 'check/**', 'release/v*' ]
 permissions:
-  packages: write
+  contents: read
 
 #===============================================================================
 # Background: in this workflow there are three different kinds of caching going
@@ -51,6 +51,9 @@ jobs:
   #=============================================================================
   cpp_job:
     name: "Build C++ (or use cache)"
+    permissions:
+      contents: read
+      packages: write
     strategy:
       matrix:
         include:
@@ -108,9 +111,9 @@ jobs:
       # only mono knows how to run such a thing on Linux. Some day the
       # maintainers will fix this so it runs with the cross-platform "dotnet".
 
-      - name: Install mono
+      - name: Install mono (Linux)
         if: runner.os == 'Linux' && steps.cache-cpp-install.outputs.cache-hit != 'true'
-        run: sudo apt install mono-complete
+        run: sudo apt install -y mono-complete
 
       # [Note: skip this step if cache-cpp-install was successful]
       # Adapted from
@@ -170,8 +173,8 @@ jobs:
         run: cmake --build cpp-client/deephaven/build --config RelWithDebInfo --target install --parallel
 
       # Upload results as build artifact. Note: if cache-cpp-install was
-      # then none of the intervening steps were executed. In that case,
-      # this effectively just copies the cache to the build artifact.
+      # successful, then none of the intervening steps were executed. In that
+      # case, this effectively just copies the cache to the build artifact.
 
       - name: Upload install dir
         id: upload-install-directory

From fe922c8846c415e7b8b6d9585ef7caaedf2d2e60 Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 19:34:13 -0400
Subject: [PATCH 37/39] This pain, no name

---
 .github/workflows/clients-cpp-python.yml      | 12 ++++++++++++
 cpp-client/deephaven/vcpkg-configuration.json | 11 ++---------
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 98280e2921e..862fbbcbe65 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -86,6 +86,17 @@ jobs:
           path: ${{ env.DHINSTALL }}
           key: ${{ runner.os }}-cpp-client-${{ hashFiles('cpp-client/**', 'proto/**') }}
 
+      # Make sure we check out the same version of the vcpkg tool that we
+      # have configured as our registry baseline. This (we suppose) will help
+      # improve the problem we have with our package hash drift.
+
+      - name: Extract vcpkg baseline
+        id: vcpkg-baseline
+        run: |
+        baseline=$(jq -r '.["default-registry"].baseline' vcpkg-configuration.json)
+        echo "baseline=$baseline"
+        echo "baseline=$baseline" >> "$GITHUB_OUTPUT"
+
       # [Note: skip this step if cache-cpp-install was successful]
       # Check out vcpkg
 
@@ -95,6 +106,7 @@ jobs:
         uses: actions/checkout@v6
         with:
           repository: microsoft/vcpkg
+          ref: ${{ steps.vcpkg-baseline.outputs.baseline }}
           path: vcpkg
 
       # [Note: skip this step if cache-cpp-install was successful]
diff --git a/cpp-client/deephaven/vcpkg-configuration.json b/cpp-client/deephaven/vcpkg-configuration.json
index 733e6283f80..1b3ca5f58dd 100644
--- a/cpp-client/deephaven/vcpkg-configuration.json
+++ b/cpp-client/deephaven/vcpkg-configuration.json
@@ -1,14 +1,7 @@
 {
   "default-registry": {
     "kind": "git",
-    "baseline": "d2bf92d8880153596e7ba15a2d672d4d77aa9d30",
+    "baseline": "443dda0f876acb0baf87a907e6d64e25a1184c16",
     "repository": "https://github.com/microsoft/vcpkg"
-  },
-  "registries": [
-    {
-      "kind": "artifact",
-      "location": "https://github.com/microsoft/vcpkg-ce-catalog/archive/refs/heads/main.zip",
-      "name": "microsoft"
-    }
-  ]
+  }
 }

From dbf5d2a621f4aea4b891cab6972b9c07b7d4b79f Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 19:35:23 -0400
Subject: [PATCH 38/39] NO

---
 .github/workflows/clients-cpp-python.yml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index 862fbbcbe65..e69760231a0 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -93,9 +93,9 @@ jobs:
       - name: Extract vcpkg baseline
         id: vcpkg-baseline
         run: |
-        baseline=$(jq -r '.["default-registry"].baseline' vcpkg-configuration.json)
-        echo "baseline=$baseline"
-        echo "baseline=$baseline" >> "$GITHUB_OUTPUT"
+          baseline=$(jq -r '.["default-registry"].baseline' vcpkg-configuration.json)
+          echo "baseline=$baseline"
+          echo "baseline=$baseline" >> "$GITHUB_OUTPUT"
 
       # [Note: skip this step if cache-cpp-install was successful]
       # Check out vcpkg

From 98bb00d53f4bb04a4d8fe34e946430f4f2fdf64f Mon Sep 17 00:00:00 2001
From: Corey Kosak <coreykosak@deephaven.io>
Date: Wed, 6 May 2026 19:36:51 -0400
Subject: [PATCH 39/39] REALLY NO

---
 .github/workflows/clients-cpp-python.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/clients-cpp-python.yml b/.github/workflows/clients-cpp-python.yml
index e69760231a0..b8c33979f87 100644
--- a/.github/workflows/clients-cpp-python.yml
+++ b/.github/workflows/clients-cpp-python.yml
@@ -93,7 +93,7 @@ jobs:
       - name: Extract vcpkg baseline
         id: vcpkg-baseline
         run: |
-          baseline=$(jq -r '.["default-registry"].baseline' vcpkg-configuration.json)
+          baseline=$(jq -r '.["default-registry"].baseline' ./cpp-client/deephaven/vcpkg-configuration.json)
           echo "baseline=$baseline"
           echo "baseline=$baseline" >> "$GITHUB_OUTPUT"