Cannot overwrite model

[visr]

This used to work:

import ribasim

toml_path = r"generated_testmodels\basic\ribasim.toml"
model = ribasim.Model.read(toml_path)
model.write(toml_path)

PermissionError                           Traceback (most recent call last)
File d:\repo\ribasim\Ribasim\models\see.py:1
----> 1 model.write(toml_path)

File D:\repo\ribasim\Ribasim\python\ribasim\ribasim\model.py:302, in Model.write(self, filepath)
    300 directory = filepath.parent
    301 directory.mkdir(parents=True, exist_ok=True)
--> 302 self._save(directory, self.input_dir)
    303 fn = self._write_toml(filepath)
    305 context_file_writing.set({})

File D:\repo\ribasim\Ribasim\python\ribasim\ribasim\model.py:194, in Model._save(self, directory, input_dir)
    192 db_path = directory / input_dir / "database.gpkg"
    193 db_path.parent.mkdir(parents=True, exist_ok=True)
--> 194 db_path.unlink(missing_ok=True)
    195 context_file_writing.get()["database"] = db_path
    197 self.edge._save(directory, input_dir)

File d:\repo\ribasim\Ribasim\.pixi\envs\dev\Lib\pathlib.py:1342, in Path.unlink(self, missing_ok)
   1337 """
   1338 Remove this file or link.
   1339 If the path is a directory, use rmdir() instead.
   1340 """
   1341 try:
-> 1342     os.unlink(self)
   1343 except FileNotFoundError:
   1344     if not missing_ok:

PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'd:\\repo\\ribasim\\Ribasim\\generated_testmodels\\basic\\database.gpkg'

I haven't verified but I suspect this relates to the migrations PR #1764 which changed around how contextlib is used.

[visr]

Fixed by #1831.