fix: Szenario-Vergleich zeigt vor heute Ist-Saldo, veraltete Szenarien werden neu gerechnet (A11-T2)

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

finance/tests/test_projection_refresh.py

@@ -0,0 +1,66 @@
+from datetime import date, timedelta
+
+from sqlalchemy import func, select
+
+from app.config import get_settings
+from app.models.tables import ProjectionPoint, ProjectionResult, Scenario
+from app.services.projection_service import refresh_stale_projections, run_projection
+
+TODAY = date(2026, 9, 28)
+
+
+def _scenario(db, name):
+    sc = Scenario(name=name, description="", include_recurring=False,
+                  include_planned=False)
+    db.add(sc)
+    db.commit()
+    return sc
+
+
+def _first_day(db, sid):
+    return db.execute(select(func.min(ProjectionPoint.day))
+                      .where(ProjectionPoint.scenario_id == sid)).scalar()
+
+
+def _count(db, sid):
+    return db.execute(select(func.count()).select_from(ProjectionPoint)
+                      .where(ProjectionPoint.scenario_id == sid)).scalar()
+
+
+def test_veraltetes_szenario_wird_ab_heute_neu_gerechnet(db):
+    sc = _scenario(db, "Alt")
+    run_projection(db, sc, 10, TODAY - timedelta(days=5))
+    assert _first_day(db, sc.id) == TODAY - timedelta(days=4)
+    assert refresh_stale_projections(db, TODAY) == 1
+    assert _first_day(db, sc.id) == TODAY + timedelta(days=1)
+    assert _count(db, sc.id) == get_settings().horizon_days
+
+
+def test_gestern_gerechnet_gilt_als_veraltet(db):
+    sc = _scenario(db, "Gestern")
+    run_projection(db, sc, 10, TODAY - timedelta(days=1))
+    assert refresh_stale_projections(db, TODAY) == 1
+
+
+def test_heute_gerechnet_bleibt_unveraendert(db):
+    sc = _scenario(db, "Heute")
+    run_projection(db, sc, 10, TODAY)
+    before = db.get(ProjectionResult, sc.id).computed_at
+    assert refresh_stale_projections(db, TODAY) == 0
+    assert _count(db, sc.id) == 10
+    assert db.get(ProjectionResult, sc.id).computed_at == before
+
+
+def test_nie_gerechnetes_szenario_bleibt_ohne_ergebnis(db):
+    sc = _scenario(db, "Nie")
+    assert refresh_stale_projections(db, TODAY) == 0
+    assert db.get(ProjectionResult, sc.id) is None
+    assert _count(db, sc.id) == 0
+
+
+def test_refresh_ist_idempotent(db):
+    sc = _scenario(db, "Zweimal")
+    run_projection(db, sc, 10, TODAY - timedelta(days=3))
+    assert refresh_stale_projections(db, TODAY) == 1
+    assert refresh_stale_projections(db, TODAY) == 0
+    assert _count(db, sc.id) == get_settings().horizon_days