Release/2026 u1

.github/workflows/full_test.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.13"]
+        python-version: ["3.10", "3.14"]
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/full_test_self_hosted.yml

@@ -3,10 +3,13 @@ name: Full Test (self-hosted)
 on:
   workflow_dispatch:
 
-  push:
-    branches: [ "main" ]
-  pull_request:
-    branches: [ "main" ]
+  # Disabled for now: the organization self-hosted runner this workflow's
+  # `test` job depends on was removed, and MIKE+ CI/CD is being reworked.
+  # Re-enable these triggers once a runner is available again.
+  # push:
+  #   branches: [ "main" ]
+  # pull_request:
+  #   branches: [ "main" ]
 
 jobs:
   lint:
@@ -40,7 +43,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.10", "3.13"]
+        python-version: ["3.10", "3.14"]
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/pr_checks.yml

@@ -0,0 +1,40 @@
+name: PR Checks
+
+# Lightweight checks that run on every PR (and pushes to main) without needing
+# the MIKE+ self-hosted runner: linting and type checking only, no tests. These
+# mirror the lint/typecheck jobs in python_publish.yml so PRs get the same
+# baseline coverage while MIKE+ CI/CD is being reworked.
+
+on:
+  workflow_dispatch:
+
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Run Ruff
+      uses: chartboost/ruff-action@v1
+      with:
+        src: "."  # Adjust the source directory as needed
+
+  typecheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+      - name: Install test dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -e .[test]
+      - name: Run mypy
+        run: |
+          mypy mikeplus/

.github/workflows/python-app.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: windows-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.12']
+        python-version: ['3.10', '3.14']
 
     steps:
     - uses: actions/checkout@v4

.github/workflows/python_publish.yml

@@ -35,37 +35,42 @@ jobs:
         run: |
           mypy mikeplus/
 
-  test:
-    runs-on: self-hosted
-    needs: [lint, typecheck]
-    strategy:
-      fail-fast: false
-      matrix:
-        python-version: ["3.10", "3.13"]
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Set up UV and Python ${{ matrix.python-version }}
-        id: setup-uv
-        uses: astral-sh/setup-uv@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-          enable-cache: true
-          cache-dependency-glob: |
-            **/requirements*.txt
-            **/setup.py
-            **/pyproject.toml
-
-      - name: Install project dependencies and test requirements
-        run: |
-          uv pip install -e .[test]
-
-      - name: Test with pytest
-        run: |
-          uv run pytest -v -m "not skip_ci"
+  # Disabled for now: this `test` job ran on the organization self-hosted
+  # runner, which was removed while MIKE+ CI/CD is being reworked. Publishing
+  # still runs (lint + typecheck below), it just no longer runs the tests.
+  # Re-enable this job (and add `test` back to `deploy.needs`) once a runner
+  # is available again.
+  # test:
+  #   runs-on: self-hosted
+  #   needs: [lint, typecheck]
+  #   strategy:
+  #     fail-fast: false
+  #     matrix:
+  #       python-version: ["3.10", "3.14"]
+  #
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #
+  #     - name: Set up UV and Python ${{ matrix.python-version }}
+  #       id: setup-uv
+  #       uses: astral-sh/setup-uv@v5
+  #       with:
+  #         python-version: ${{ matrix.python-version }}
+  #         enable-cache: true
+  #         cache-dependency-glob: |
+  #           **/requirements*.txt
+  #           **/setup.py
+  #           **/pyproject.toml
+  #
+  #     - name: Install project dependencies and test requirements
+  #       run: |
+  #         uv pip install -e .[test]
+  #
+  #     - name: Test with pytest
+  #       run: |
+  #         uv run pytest -v -m "not skip_ci"
   deploy:
-    needs: [lint, typecheck, test]
+    needs: [lint, typecheck]
     runs-on: windows-latest
 
     permissions:
@@ -77,7 +82,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: '3.13'
+        python-version: '3.14'
     - name: Set up .NET
       uses: actions/setup-dotnet@v3
       with:

CHANGELOG.md

@@ -4,22 +4,38 @@
 
 ### Added
 
-- Support for MIKE+ 2026.
-- Improved developer documentation for releases.
-
 ### Changed
 
 ### Deprecated
 
 ### Removed
 
-- DataTableAccess: this was previously marked for deprecation and is now replaced by Database.
-- Engine classes (FloodEngine, EPANET, MIKE1D): these were previously marked for deprecation and are now replaced by SimulationRunner.
-
 ### Fixed
 
 ### Security
 
+## [2026.1.0] - 2026-06-23
+
+### Added
+
+- Support for MIKE+ 2026 Update 1.
+
+### Fixed
+
+- Inserting a row with no field values on MIKE+ 2026 Update 1.
+
+## [2026.0.0] - 2026-01-29
+
+### Added
+
+- Support for MIKE+ 2026.
+- Improved developer documentation for releases.
+
+### Removed
+
+- DataTableAccess: this was previously marked for deprecation and is now replaced by Database.
+- Engine classes (FloodEngine, EPANET, MIKE1D): these were previously marked for deprecation and are now replaced by SimulationRunner.
+
 ## [2025.6.0] - 2025-12-12
 
 ### Added

DEVELOPMENT.md

@@ -2,6 +2,20 @@
 
 This is a space for documenting standard development and maintenance processes.
 
+## Compatibility principle: no breaking changes within a year line
+
+Within a MIKE+ year (all `2026.x.x` releases), avoid changes that break users
+regardless of which update (GA, U1, U2, …) of that year they have installed.
+Save genuine breaks for the next year bump.
+
+- Adding tables/columns is fine — they degrade gracefully against older
+  assemblies (`GetTable` returns `None`, `BaseTable.__init__` warns and
+  continues). Don't add code that hard-fails on a missing table/column. Avoid
+  removing or renaming mid-year.
+- For changed .NET signatures, support both forms (try new, fall back to old)
+  rather than swapping. See `SimulationRunner.__init__`. Tag fallbacks with
+  `TODO(<next year>)` for cleanup at the year bump.
+
 ## Release process for new MIKE+ versions
 
 When a new version of MIKE+ is released, the following needs to be done before releasing a corresponing Python vesrion:

docs/_table_generated_sections.yml

@@ -22,6 +22,7 @@ sections:
   - m2d_ADPrecipitationArea
   - m2d_ADPrecipitationD
   - m2d_BndDistributedSource
+  - m2d_BndGlobalSetting
   - m2d_BndQHRelation
   - m2d_Boundary
   - m2d_Coupling
@@ -54,6 +55,7 @@ sections:
   - m_CustomConfig
   - m_CustomUnit
   - m_DefaultValue
+  - m_GenericSetting
   - m_GlobalParameter
   - m_Measurement
   - m_Media
@@ -240,6 +242,7 @@ sections:
   - mss_Inflow
   - mss_InflowD
   - mss_Inlet
+  - mss_InletConduitCon
   - mss_LIDControl
   - mss_LIDControlD
   - mss_LIDusage
@@ -322,6 +325,7 @@ sections:
   - mw_Valve
   - mw_WDOAggSensors
   - mw_WDOAggSensorsD
+  - mw_WDOAmi
   - mw_WDOComparisons
   - mw_WDOControls
   - mw_WDODemandPredictions

mikeplus/__init__.py

@@ -1,6 +1,6 @@
 """MIKE+Py package."""
 
-__version__ = "2026.0.0"
+__version__ = "2026.1.0"
 
 
 from pathlib import Path

mikeplus/dotnet.py

@@ -9,7 +9,7 @@
 
 import clr  # noqa: F401
 import datetime
-from typing import Any, Dict, Optional
+from typing import Any, Dict
 
 import pandas as pd
 
@@ -119,25 +119,28 @@ def from_dotnet_value(value: Any) -> Any:
     @staticmethod
     def to_dotnet_dictionary(
         py_dict: Dict[str, Any],
-    ) -> Optional[Dictionary[String, Object]]:
+    ) -> Dictionary[String, Object]:
         """Convert a Python dictionary to a .NET Dictionary.
 
+        An empty/falsy ``py_dict`` yields an empty .NET Dictionary (not ``None``);
+        some MIKE+ 2026 U1 insert APIs NullReference on a ``null`` fields argument.
+
         Parameters
         ----------
         py_dict : Dict[str, Any]
             Python dictionary to convert
 
         Returns
         -------
-        Dictionary[String, Object] or None
+        Dictionary[String, Object]
             .NET Dictionary with converted values
 
         """
-        if not py_dict:
-            return None
-
         net_dict = Dictionary[String, Object]()
 
+        if not py_dict:
+            return net_dict
+
         for key, value in py_dict.items():
             net_dict[key] = DotNetConverter.to_dotnet_value(value)
 

mikeplus/queries.py

@@ -348,11 +348,7 @@ def _execute_impl(self) -> str:
         non_ud_values = {k: v for k, v in values.items() if k not in ud_columns}
         ud_values = {k: v for k, v in values.items() if k in ud_columns}
 
-        net_values = (
-            DotNetConverter.to_dotnet_dictionary(non_ud_values)
-            if non_ud_values
-            else None
-        )
+        net_values = DotNetConverter.to_dotnet_dictionary(non_ud_values)
 
         _, inserted_muid = net_table.InsertByCommand(
             muid,

mikeplus/simulation_runner.py

@@ -39,8 +39,17 @@ def __init__(self, database: Database):
         >>> runner = SimulationRunner(db)
         """
         self._database = database
-        self._engine_tool = EngineTool()
-        self._engine_tool.DataTables = self._database._data_table_container
+        # MIKE+ 2026 U1 changed the EngineTool constructor signature. To avoid a
+        # breaking change within the 2026 line, support both: try the U1+ form
+        # (container passed to the constructor), then fall back to the 2026 GA
+        # form (parameterless constructor + DataTables property). pythonnet raises
+        # TypeError when no constructor overload matches the given arguments.
+        # TODO(2027): drop the GA fallback once 2026 GA installs have aged out.
+        try:
+            self._engine_tool = EngineTool(self._database._data_table_container)
+        except TypeError:
+            self._engine_tool = EngineTool()
+            self._engine_tool.DataTables = self._database._data_table_container
 
     def run(
         self,