feat: Engine+Schema fuer Szenario-Ende und szenario-eigene Einmalzahlungen

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

finance/tests/test_models.py

@@ -22,3 +22,15 @@ def test_account_transaction_roundtrip(db):
     db.add(tx)
     db.commit()
     assert db.query(Transaction).one().amount == Decimal("-50.00")
+
+
+def test_scenario_planned_item_roundtrip(db):
+    from app.models.tables import Scenario, ScenarioPlannedItem
+    sc = Scenario(name="SPI-Test", description="")
+    db.add(sc)
+    db.flush()
+    db.add(ScenarioPlannedItem(scenario_id=sc.id, name="Einmalzahlung",
+                               amount=Decimal("5000.00"), due=date(2026, 7, 30)))
+    db.commit()
+    item = db.query(ScenarioPlannedItem).one()
+    assert item.amount == Decimal("5000.00") and item.scenario_id == sc.id

finance/tests/test_scenario_engine.py

@@ -57,3 +57,51 @@ def test_absolute_modifier_clamps_to_zero():
                           kind="absolute", value=Decimal("300"))]
     flows = build_cashflows(rec, [], [], [], mods, date(2026, 8, 1), date(2026, 8, 31))
     assert flows == [(date(2026, 8, 10), Decimal("0.00"))]
+
+
+def test_ende_modifier_beendet_posten_im_szenario():
+    r = PlainRecurring(1, "Miete", Decimal("-2000.00"), "monthly", 1, None, None, None)
+    m = PlainModifier("recurring", 1, "ende", Decimal("0"), date(2026, 8, 31))
+    flows = build_cashflows([r], [], [], [], [m], date(2026, 7, 1), date(2026, 12, 31))
+    assert [d for d, _ in flows] == [date(2026, 7, 1), date(2026, 8, 1)]
+    assert all(a == Decimal("-2000.00") for _, a in flows)
+
+
+def test_ende_modifier_minimum_mit_eigenem_ende():
+    # Posten endet selbst am 15.10.; Szenario-Ende 31.08. ist frueher -> gewinnt.
+    r = PlainRecurring(1, "Miete", Decimal("-100.00"), "monthly", 1,
+                       None, date(2026, 10, 15), None)
+    m = PlainModifier("recurring", 1, "ende", Decimal("0"), date(2026, 8, 31))
+    flows = build_cashflows([r], [], [], [], [m], date(2026, 7, 1), date(2026, 12, 31))
+    assert [d for d, _ in flows] == [date(2026, 7, 1), date(2026, 8, 1)]
+    # Umgekehrt: Szenario-Ende NACH eigenem Ende aendert nichts.
+    m_spaet = PlainModifier("recurring", 1, "ende", Decimal("0"), date(2026, 12, 31))
+    flows2 = build_cashflows([r], [], [], [], [m_spaet], date(2026, 7, 1), date(2026, 12, 31))
+    assert [d for d, _ in flows2][-1] == date(2026, 10, 1)
+
+
+def test_ende_modifier_auf_kategorie_trifft_alle_posten_der_kategorie():
+    r1 = PlainRecurring(1, "Miete A", Decimal("-10.00"), "monthly", 1, None, None, 7)
+    r2 = PlainRecurring(2, "Miete B", Decimal("-20.00"), "monthly", 1, None, None, 7)
+    r3 = PlainRecurring(3, "Strom", Decimal("-5.00"), "monthly", 1, None, None, 9)
+    m = PlainModifier("category", 7, "ende", Decimal("0"), date(2026, 7, 31))
+    flows = build_cashflows([r1, r2, r3], [], [], [], [m],
+                            date(2026, 7, 1), date(2026, 9, 30))
+    betraege = sorted(a for _, a in flows)
+    # Miete A/B nur je 1x (Juli), Strom 3x (Juli-Sept).
+    assert betraege == [Decimal("-20.00"), Decimal("-10.00"),
+                        Decimal("-5.00"), Decimal("-5.00"), Decimal("-5.00")]
+
+
+def test_ende_modifier_ohne_datum_wirkt_nicht():
+    r = PlainRecurring(1, "Miete", Decimal("-10.00"), "monthly", 1, None, None, None)
+    m = PlainModifier("recurring", 1, "ende", Decimal("0"), None)
+    flows = build_cashflows([r], [], [], [], [m], date(2026, 7, 1), date(2026, 9, 30))
+    assert len(flows) == 3
+
+
+def test_ende_modifier_aendert_betraege_nicht():
+    r = PlainRecurring(1, "Miete", Decimal("-2000.00"), "monthly", 1, None, None, None)
+    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)