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_views_pg.py

@@ -0,0 +1,82 @@
+"""Postgres-only-Prüfung der Grafana-Views (Ausbaustufe 11).
+
+Läuft nur mit FB_TEST_PG_URL (Wegwerf-Postgres, DB-Name muss auf '_test'
+enden - Schutz gegen versehentliche Ausführung gegen die Produktiv-DB).
+Beispiel:
+  podman run -d --rm --name a11-pg -e POSTGRES_PASSWORD=wegwerf \
+    -e POSTGRES_DB=fb_test -p 127.0.0.1:55432:5432 docker.io/library/postgres:17.10
+  FB_TEST_PG_URL=postgresql+psycopg://postgres:wegwerf@127.0.0.1:55432/fb_test \
+    .venv/bin/python -m pytest -q tests/test_views_pg.py
+"""
+import os
+from datetime import timedelta
+from decimal import Decimal
+
+import pytest
+from sqlalchemy import create_engine, text
+from sqlalchemy.engine import make_url
+from sqlalchemy.orm import Session
+
+from app.db import Base
+import app.models  # noqa: F401
+from app.models.tables import (Account, ProjectionPoint, ProjectionResult,
+                               Scenario, Transaction)
+from app.models.views import RESERVED_SCENARIO_NAME, VIEWS, create_views
+
+PG_URL = os.environ.get("FB_TEST_PG_URL")
+pytestmark = pytest.mark.skipif(not PG_URL, reason="FB_TEST_PG_URL nicht gesetzt")
+
+
+def _reset(engine):
+    with engine.begin() as conn:
+        for name in VIEWS:
+            conn.execute(text(f"DROP VIEW IF EXISTS {name} CASCADE"))
+    Base.metadata.drop_all(engine)
+
+
+@pytest.fixture
+def pg():
+    assert make_url(PG_URL).database.endswith("_test"), "nur Wegwerf-DB *_test!"
+    engine = create_engine(PG_URL)
+    _reset(engine)
+    Base.metadata.create_all(engine)
+    create_views(engine)
+    with Session(engine) as session:
+        yield session
+    _reset(engine)
+    engine.dispose()
+
+
+def test_v_projection_ist_serie_und_szenario_ab_heute(pg):
+    today = pg.execute(text("SELECT CURRENT_DATE")).scalar()
+    acc = Account(bank="t", iban="DE-PG-1", name="Testkonto", type="giro",
+                  anchor_date=today - timedelta(days=10),
+                  anchor_balance=Decimal("1000.00"))
+    pg.add(acc)
+    pg.flush()
+    pg.add(Transaction(account_id=acc.id, booking_date=today - timedelta(days=2),
+                       amount=Decimal("-100.00"), purpose="t", counterparty="t",
+                       status="confirmed", dedup_hash="pg-1"))
+    stale = Scenario(name="Veraltet", description="")
+    empty = Scenario(name="Ohne Punkte", description="")
+    pg.add_all([stale, empty])
+    pg.flush()
+    # Veraltete Momentaufnahme: Punkte von heute-5 bis heute+5.
+    for off in range(-5, 6):
+        pg.add(ProjectionPoint(scenario_id=stale.id, day=today + timedelta(days=off),
+                               balance=Decimal("5000.00")))
+    pg.add(ProjectionResult(scenario_id=stale.id, computed_at=today,
+                            low_point_date=today, low_point_balance=Decimal("0")))
+    pg.commit()
+
+    rows = pg.execute(text(
+        "SELECT scenario, day, balance FROM v_projection ORDER BY scenario, day")).all()
+    ist = [r for r in rows if r.scenario == RESERVED_SCENARIO_NAME]
+    sc = [r for r in rows if r.scenario == "Veraltet"]
+    assert max(r.day for r in ist) == today
+    assert [r.balance for r in ist if r.day == today] == [Decimal("900.00")]
+    # Szenario startet heute am Ist-Saldo, keine alten Punkte davor.
+    assert sc[0].day == today and sc[0].balance == Decimal("900.00")
+    assert all(r.day >= today for r in sc)
+    assert [r.balance for r in sc[1:]] == [Decimal("5000.00")] * 5
+    assert not any(r.scenario == "Ohne Punkte" for r in rows)