Chore: Drop system check for deprecated convert variables

A dedicated system check for the two deprecated ImageMagick convert variables is more machinery than a simple deprecation needs.

Remove the check and its tests. The settings removal, the deprecation notes in the configuration docs, and the example configuration cleanup stay as they were.

src/paperless/checks.py

@@ -337,37 +337,6 @@ def check_deprecated_v2_ocr_env_vars(
     return warnings
 
 
-DEPRECATED_CONVERT_ENV_VARS: dict[str, str] = {
-    "PAPERLESS_CONVERT_MEMORY_LIMIT": "paperless.W004",
-    "PAPERLESS_CONVERT_TMPDIR": "paperless.W005",
-}
-
-
-@register()
-def check_deprecated_convert_env_vars(
-    app_configs: object,
-    **kwargs: object,
-) -> list[Warning]:
-    """Warn when the deprecated ImageMagick convert environment variables are set.
-
-    PDF thumbnails no longer use ImageMagick, so these variables are ignored.
-    """
-    warnings: list[Warning] = []
-
-    for var, check_id in DEPRECATED_CONVERT_ENV_VARS.items():
-        if os.environ.get(var):
-            warnings.append(
-                Warning(
-                    f"{var} is deprecated, has no effect and will be removed "
-                    "in a future release.",
-                    hint="It can be removed from your environment or configuration.",
-                    id=check_id,
-                ),
-            )
-
-    return warnings
-
-
 def get_tesseract_langs():
     proc = subprocess.run(
         [shutil.which("tesseract"), "--list-langs"],

src/paperless/tests/test_checks_v3.py

@@ -1,4 +1,4 @@
-"""Tests for v3 system checks: deprecated environment variable warnings."""
+"""Tests for v3 system checks: deprecated v2 OCR env var warnings."""
 
 from __future__ import annotations
 
@@ -7,7 +7,6 @@ from typing import TYPE_CHECKING
 
 import pytest
 
-from paperless.checks import check_deprecated_convert_env_vars
 from paperless.checks import check_deprecated_v2_ocr_env_vars
 
 if TYPE_CHECKING:
@@ -63,94 +62,3 @@ class TestDeprecatedV2OcrEnvVarWarnings:
         warning = result[0]
         assert warning.id == expected_id
         assert expected_fragment in warning.msg
-
-
-class TestDeprecatedConvertEnvVarWarnings:
-    def test_no_deprecated_vars_returns_empty(self, mocker: MockerFixture) -> None:
-        """
-        GIVEN:
-            - Neither deprecated convert variable is set
-        WHEN:
-            - The deprecated convert check runs
-        THEN:
-            - No warnings are returned
-        """
-        mocker.patch.dict(os.environ, {}, clear=True)
-        assert check_deprecated_convert_env_vars(None) == []
-
-    def test_empty_value_returns_empty(self, mocker: MockerFixture) -> None:
-        """
-        GIVEN:
-            - A deprecated convert variable is set to an empty string
-        WHEN:
-            - The deprecated convert check runs
-        THEN:
-            - No warnings are returned
-        """
-        mocker.patch.dict(
-            os.environ,
-            {"PAPERLESS_CONVERT_TMPDIR": ""},
-            clear=True,
-        )
-        assert check_deprecated_convert_env_vars(None) == []
-
-    @pytest.mark.parametrize(
-        ("env_var", "env_value", "expected_id"),
-        [
-            pytest.param(
-                "PAPERLESS_CONVERT_MEMORY_LIMIT",
-                "32",
-                "paperless.W004",
-                id="memory-limit-warns",
-            ),
-            pytest.param(
-                "PAPERLESS_CONVERT_TMPDIR",
-                "/var/tmp/paperless",
-                "paperless.W005",
-                id="tmpdir-warns",
-            ),
-        ],
-    )
-    def test_deprecated_var_produces_one_warning(
-        self,
-        mocker: MockerFixture,
-        env_var: str,
-        env_value: str,
-        expected_id: str,
-    ) -> None:
-        """
-        GIVEN:
-            - One deprecated convert variable is set
-        WHEN:
-            - The deprecated convert check runs
-        THEN:
-            - Exactly one warning naming that variable is returned
-        """
-        mocker.patch.dict(os.environ, {env_var: env_value}, clear=True)
-        result = check_deprecated_convert_env_vars(None)
-
-        assert len(result) == 1
-        assert result[0].id == expected_id
-        assert env_var in result[0].msg
-        assert "no effect" in result[0].msg
-
-    def test_both_vars_produce_two_warnings(self, mocker: MockerFixture) -> None:
-        """
-        GIVEN:
-            - Both deprecated convert variables are set
-        WHEN:
-            - The deprecated convert check runs
-        THEN:
-            - One warning per variable is returned
-        """
-        mocker.patch.dict(
-            os.environ,
-            {
-                "PAPERLESS_CONVERT_MEMORY_LIMIT": "32",
-                "PAPERLESS_CONVERT_TMPDIR": "/var/tmp/paperless",
-            },
-            clear=True,
-        )
-        result = check_deprecated_convert_env_vars(None)
-
-        assert {w.id for w in result} == {"paperless.W004", "paperless.W005"}