v1.8.16: Finanzen-Tab — Festpreis vs. Spot-Vergleich

Täglicher Tarif-Tracking: kWh + EPEX-Ø-Preis werden ab jetzt täglich
gespeichert. Neuer Finanzen-Tab zeigt Balkendiagramm (Festpreis vs.
Spot hypothetisch), Summen-Karten und Empfehlung ob flexibler Tarif
sich lohnen würde.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

haos-addon/src/history.py

@@ -47,6 +47,16 @@ def init_db():
                 PRIMARY KEY (agg_id, period_type, period_key)
             )
         """)
+        # Tariftage: täglicher Verbrauch + Preisvergleich
+        c.execute("""
+            CREATE TABLE IF NOT EXISTS tariff_days (
+                date       TEXT PRIMARY KEY,
+                kwh        REAL NOT NULL,
+                spot_ct    REAL,
+                fixed_ct   REAL NOT NULL,
+                markup_ct  REAL NOT NULL DEFAULT 0
+            )
+        """)
         c.commit()
     cleanup_old()
     log.info("History DB initialisiert: %s", DB_PATH)
@@ -137,6 +147,51 @@ def query(inv_id: str, sensor_id: str,
     return rows
 
 
+def save_daily_tariff_snapshot(date_iso: str, prev_kwh: float, cur_kwh: float,
+                               spot_ct: Optional[float], fixed_ct: float, markup_ct: float):
+    """Speichert den Tagesverbrauch + Preisdaten für einen abgeschlossenen Tag."""
+    delta = max(0.0, cur_kwh - prev_kwh)
+    with _lock:
+        c = _get_conn()
+        c.execute("""
+            INSERT OR IGNORE INTO tariff_days(date, kwh, spot_ct, fixed_ct, markup_ct)
+            VALUES(?, ?, ?, ?, ?)
+        """, (date_iso, round(delta, 4), spot_ct, fixed_ct, markup_ct))
+        c.commit()
+
+
+def get_tariff_days(from_date: str, to_date: str) -> List[Tuple]:
+    """Gibt alle Tariftage im Bereich [from_date, to_date] zurück."""
+    with _lock:
+        return _get_conn().execute("""
+            SELECT date, kwh, spot_ct, fixed_ct, markup_ct
+            FROM tariff_days
+            WHERE date >= ? AND date <= ?
+            ORDER BY date ASC
+        """, (from_date, to_date)).fetchall()
+
+
+def get_daily_kwh_start(date_iso: str) -> Optional[float]:
+    """Gibt den gespeicherten kWh-Tagesstartwert zurück (aus period_starts)."""
+    with _lock:
+        row = _get_conn().execute("""
+            SELECT value FROM period_starts
+            WHERE agg_id='tariff' AND period_type='daily' AND period_key=?
+        """, (date_iso,)).fetchone()
+    return row[0] if row else None
+
+
+def save_daily_kwh_start(date_iso: str, kwh: float):
+    """Speichert den kWh-Stand als Tagesstartwert (einmalig, INSERT OR IGNORE)."""
+    with _lock:
+        c = _get_conn()
+        c.execute("""
+            INSERT OR IGNORE INTO period_starts(agg_id, period_type, period_key, value)
+            VALUES('tariff', 'daily', ?, ?)
+        """, (date_iso, kwh))
+        c.commit()
+
+
 def cleanup_old(days: int = RETENTION_DAYS):
     cutoff = time.time() - days * 86400
     with _lock: