feat: Szenario-Einträge je Stichtag mit Zeitraum und Art Neuer Betrag (A14-T2)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

finance/tests/test_breakdown.py

@@ -172,3 +172,25 @@ def test_category_rows_nur_kosten_der_kategorien():
     assert [r.name for r in category_rows(rs, {"Wohnen", "Versicherung"})] == ["Miete", "Police", "Strom"]
     assert category_rows(rs, set()) == []
     assert category_rows(rs, {FREI}) == []
+
+
+def test_stichtag_ist_faelligkeitstag_im_monat():
+    r = PlainRecurring(1, "R1", D("-200.00"), "monthly", 14, None, None, None)
+    mods = [PlainModifier("recurring", 1, "percent", D("50"), start_date=date(2030, 10, 16))]
+    assert by_name(rows(month=date(2030, 10, 1), recurring=[r], modifiers=mods)) == {"R1": D("-200.00")}
+    assert by_name(rows(month=date(2030, 11, 1), recurring=[r], modifiers=mods)) == {"R1": D("-100.00")}
+
+
+def test_stichtag_monatsende_geklemmt():
+    # Fällig am 31.: im Februar ist der Stichtag der 28.02. (liegt im Zeitraum).
+    r = PlainRecurring(1, "R1", D("-100.00"), "monthly", 31, None, None, None)
+    mods = [PlainModifier("recurring", 1, "remove", D("0"), end_date=date(2030, 2, 28))]
+    assert rows(month=date(2030, 2, 1), recurring=[r], modifiers=mods) == []
+    assert by_name(rows(month=date(2030, 3, 1), recurring=[r], modifiers=mods)) == {"R1": D("-100.00")}
+
+
+def test_szenario_zahlung_ohne_recurring_id():
+    r = PlainRecurring(None, "S", D("-30.00"), "monthly", 1, None, None, 1)
+    rs = rows(recurring=[r])
+    assert by_name(rs) == {"S": D("-30.00")}
+    assert (rs[0].recurring_id, rs[0].category) == (None, "Wohnen")

finance/tests/test_recurrence.py

@@ -27,3 +27,10 @@ def test_monthly_leap_year_clamping():
 def test_quarterly_clamping():
     got = occurrences("quarterly", 31, date(2026, 1, 1), date(2026, 12, 31))
     assert got == [date(2026, 1, 31), date(2026, 4, 30), date(2026, 7, 31), date(2026, 10, 31)]
+
+
+def test_due_in_month_klemmt_auf_monatsende():
+    from app.engine.recurrence import due_in_month
+    assert due_in_month(date(2030, 2, 1), 31) == date(2030, 2, 28)
+    assert due_in_month(date(2032, 2, 10), 30) == date(2032, 2, 29)
+    assert due_in_month(date(2030, 10, 1), 14) == date(2030, 10, 14)

finance/tests/test_scenario_engine.py

@@ -105,3 +105,70 @@ def test_ende_modifier_aendert_betraege_nicht():
     m = PlainModifier("recurring", 1, "ende", Decimal("50"), date(2026, 12, 31))
     flows = build_cashflows([r], [], [], [], [m], date(2026, 7, 1), date(2026, 8, 31))
     assert all(a == Decimal("-2000.00") for _, a in flows)
+
+
+D = Decimal
+
+
+def _rec(amount="-100.00", due_day=14, id=1, cat=None):
+    return PlainRecurring(id, "R", D(amount), "monthly", due_day, None, None, cat)
+
+
+def test_zeitraum_grenzen_inklusiv():
+    mods = [PlainModifier("recurring", 1, "percent", D("50"),
+                          end_date=date(2030, 3, 14), start_date=date(2030, 2, 14))]
+    flows = build_cashflows([_rec()], [], [], [], mods, date(2030, 1, 1), date(2030, 4, 30))
+    assert flows == [(date(2030, 1, 14), D("-100.00")),
+                     (date(2030, 2, 14), D("-50.00")),
+                     (date(2030, 3, 14), D("-50.00")),
+                     (date(2030, 4, 14), D("-100.00"))]
+
+
+def test_ab_stichtag_erst_folgemonat():
+    # Fällig am 14., gültig ab 16.10. -> Oktober voll, ab November halbiert.
+    mods = [PlainModifier("recurring", 1, "percent", D("50"), start_date=date(2030, 10, 16))]
+    flows = build_cashflows([_rec("-200.00")], [], [], [], mods,
+                            date(2030, 10, 1), date(2030, 12, 31))
+    assert flows == [(date(2030, 10, 14), D("-200.00")),
+                     (date(2030, 11, 14), D("-100.00")),
+                     (date(2030, 12, 14), D("-100.00"))]
+
+
+def test_neuer_betrag_dann_prozent():
+    mods = [PlainModifier("recurring", 1, "set", D("-80.00"), start_date=date(2030, 2, 1)),
+            PlainModifier("recurring", 1, "percent", D("25"))]
+    flows = build_cashflows([_rec(due_day=1)], [], [], [], mods,
+                            date(2030, 1, 1), date(2030, 2, 28))
+    assert flows == [(date(2030, 1, 1), D("-75.00")), (date(2030, 2, 1), D("-60.00"))]
+
+
+def test_entfaellt_nur_im_zeitraum():
+    mods = [PlainModifier("recurring", 1, "remove", D("0"),
+                          end_date=date(2030, 2, 28), start_date=date(2030, 2, 1))]
+    flows = build_cashflows([_rec(due_day=1)], [], [], [], mods,
+                            date(2030, 1, 1), date(2030, 3, 31))
+    assert [d for d, _ in flows] == [date(2030, 1, 1), date(2030, 3, 1)]
+
+
+def test_szenario_zahlung_ohne_id_nur_von_kategorie_getroffen():
+    rec = [PlainRecurring(None, "S", D("-100.00"), "monthly", 1, None, None, 7)]
+    mods = [PlainModifier("recurring", 1, "remove", D("0")),
+            PlainModifier("category", 7, "percent", D("10"))]
+    flows = build_cashflows(rec, [], [], [], mods, date(2030, 1, 1), date(2030, 1, 31))
+    assert flows == [(date(2030, 1, 1), D("-90.00"))]
+
+
+def test_einmalposten_stichtag_ist_faelligkeit():
+    planned = [PlainPlanned("E", D("-100.00"), date(2030, 1, 31), 7),
+               PlainPlanned("F", D("-100.00"), date(2030, 2, 1), 7)]
+    mods = [PlainModifier("category", 7, "percent", D("50"), start_date=date(2030, 2, 1))]
+    flows = build_cashflows([], planned, [], [], mods, date(2030, 1, 1), date(2030, 2, 28))
+    assert flows == [(date(2030, 1, 31), D("-100.00")), (date(2030, 2, 1), D("-50.00"))]
+
+
+def test_ende_unveraendert_mit_zeitraum_feldern():
+    # "ende" wirkt weiter nur über effective_end, nie als Betragsänderung.
+    mods = [PlainModifier("recurring", 1, "ende", D("0"), date(2030, 2, 15))]
+    flows = build_cashflows([_rec(due_day=1)], [], [], [], mods,
+                            date(2030, 1, 1), date(2030, 4, 30))
+    assert flows == [(date(2030, 1, 1), D("-100.00")), (date(2030, 2, 1), D("-100.00"))]

finance/tests/test_scenario_inputs.py

@@ -12,8 +12,8 @@ from app.services.projection_service import load_scenario_inputs
 def test_modifikator_helfer_oeffentlich():
     mods = [PlainModifier("recurring", 1, "percent", Decimal("10")),
             PlainModifier("recurring", 1, "ende", Decimal("0"), date(2030, 6, 30))]
-    assert modified_amount(Decimal("-100.00"), None, 1, mods) == Decimal("-90.00")
-    assert modified_amount(Decimal("-100.00"), None, 2, mods) == Decimal("-100.00")
+    assert modified_amount(Decimal("-100.00"), None, 1, mods, on=date(2030, 1, 1)) == Decimal("-90.00")
+    assert modified_amount(Decimal("-100.00"), None, 2, mods, on=date(2030, 1, 1)) == Decimal("-100.00")
     r = PlainRecurring(1, "R", Decimal("-100.00"), "monthly", 1, None,
                        date(2030, 12, 31), None)
     assert effective_end(r, mods) == date(2030, 6, 30)