feat: extend inventory and administration workflows

tests/test_contributions.py

@@ -59,6 +59,49 @@ def test_legacy_claim_becomes_itemized_when_position_is_added(tmp_path) -> None:
     assert claim_balance(data, claim) == Decimal("90.00")
 
 
+def test_claim_base_data_can_be_edited(tmp_path) -> None:
+    repository, member = _repository_with_claim(tmp_path)
+
+    repository.update_claim(
+        member.member_id,
+        "claim-1",
+        title="Korrigierter Beitrag",
+        due_date="30.06.2026",
+        base_amount="75,00",
+        description="Beitrag für sechs Monate",
+    )
+
+    _data, claim = repository.get_claim(member.member_id, "claim-1")
+    assert claim["title"] == "Korrigierter Beitrag"
+    assert claim["due_date"] == "2026-06-30"
+    assert claim["amount"] == "75.00"
+    assert claim["items"][0]["description"] == "Beitrag für sechs Monate"
+    assert claim["items"][0]["amount"] == "75.00"
+    assert claim["calculation"]["manual_override"]["actor"] == "Vorstand"
+    assert repository.get_events(member.member_id)[-1].event_type == "claim_changed"
+
+
+def test_claim_cannot_be_reduced_below_allocated_payment(tmp_path) -> None:
+    repository, member = _repository_with_claim(tmp_path)
+    repository.record_payment(
+        member.member_id,
+        "claim-1",
+        payment_date="2026-06-21",
+        amount="80.00",
+        allocation_amount="80.00",
+    )
+
+    with pytest.raises(RepositoryError, match="bereits zugeordneten Betrag"):
+        repository.update_claim(
+            member.member_id,
+            "claim-1",
+            title="Zu klein",
+            due_date="2026-06-30",
+            base_amount="75.00",
+            description="",
+        )
+
+
 def test_payment_can_be_split_across_multiple_claims(tmp_path) -> None:
     repository, member = _repository_with_claim(tmp_path)
     data = repository.get_contributions(member.member_id)
@@ -104,6 +147,77 @@ def test_payment_can_be_split_across_multiple_claims(tmp_path) -> None:
         )
 
 
+def test_payment_allocation_cannot_overpay_claim(tmp_path) -> None:
+    repository, member = _repository_with_claim(tmp_path, amount="12.50")
+
+    with pytest.raises(RepositoryError, match="nur noch 12.50 EUR offen"):
+        repository.record_payment(
+            member.member_id,
+            "claim-1",
+            payment_date="2026-06-21",
+            amount="22.50",
+            allocation_amount="22.50",
+        )
+
+
+def test_payment_can_be_edited_and_reallocated_atomically(tmp_path) -> None:
+    repository, member = _repository_with_claim(tmp_path, amount="12.50")
+    data = repository.get_contributions(member.member_id)
+    data.claims.append(
+        {
+            "claim_id": "admission-fee",
+            "claim_key": "admission-fee",
+            "title": "Aufnahmegebühr",
+            "amount": "10.00",
+            "due_date": "2026-12-31",
+            "status": "open",
+        }
+    )
+    repository.save_contributions(member.member_id, data)
+    payment = repository.record_payment(
+        member.member_id,
+        "claim-1",
+        payment_date="2026-06-21",
+        amount="22.50",
+        allocation_amount="12.50",
+        reference="Vorher",
+    )
+
+    repository.update_payment(
+        member.member_id,
+        payment["payment_id"],
+        payment_date="22.06.2026",
+        amount="22.50",
+        allocations={"claim-1": "12.50", "admission-fee": "10.00"},
+        reference="Korrigiert",
+    )
+
+    changed = repository.get_contributions(member.member_id)
+    assert changed.payments[0]["date"] == "2026-06-22"
+    assert changed.payments[0]["reference"] == "Korrigiert"
+    assert payment_allocated_total(changed, payment["payment_id"]) == Decimal("22.50")
+    assert {item["claim_id"] for item in changed.allocations} == {"claim-1", "admission-fee"}
+    assert repository.get_events(member.member_id)[-1].event_type == "payment_changed"
+
+
+def test_payment_can_be_deleted_with_its_allocations(tmp_path) -> None:
+    repository, member = _repository_with_claim(tmp_path)
+    payment = repository.record_payment(
+        member.member_id,
+        "claim-1",
+        payment_date="2026-06-21",
+        amount="10.00",
+        allocation_amount="10.00",
+    )
+
+    repository.delete_payment(member.member_id, payment["payment_id"])
+
+    data = repository.get_contributions(member.member_id)
+    assert data.payments == []
+    assert data.allocations == []
+    assert repository.get_events(member.member_id)[-1].event_type == "payment_deleted"
+
+
 def test_credit_claim_settlement_is_displayed_as_positive_amount() -> None:
     claim = {"claim_id": "claim-1", "title": "Kautionsrückzahlung", "amount": "-25.00"}
     data = ContributionData(