feat(mcp): queue long-running calculations

tests/unit/test_calculation_cleanup.py

@@ -0,0 +1,25 @@
+import json
+
+import pytest
+
+from app.services.calculation_cleanup import _names, record_calculation_database
+from app.algorithms._utils import calculation_temp_directory
+
+
+def test_job_owned_database_ledger_survives_until_successful_cleanup(tmp_path, monkeypatch):
+    monkeypatch.setenv("TJWATER_CALCULATION_JOB_DIR", str(tmp_path))
+    name = "tjw_tmp_run_project_" + "a" * 32
+    record_calculation_database(name)
+    record_calculation_database(name)
+    assert _names(tmp_path) == [name]
+    assert json.loads((tmp_path / "databases.json").read_text()) == [name]
+    record_calculation_database(name, removed=True)
+    assert _names(tmp_path) == []
+    assert calculation_temp_directory("leakage") == str(tmp_path / "leakage")
+
+
+@pytest.mark.parametrize("names", [["production"], ["tjw_tmp_not_random"], {"database": "production"}])
+def test_cleanup_rejects_non_job_database_names(tmp_path, names):
+    (tmp_path / "databases.json").write_text(json.dumps(names))
+    with pytest.raises(ValueError):
+        _names(tmp_path)