ALmost done with Halbjahres Bilanz

sheets/models.py

@@ -212,4 +212,42 @@ class SecondTableEntry(models.Model):
     date_joined = models.DateField(auto_now_add=True)
 
     def __str__(self):
-        return f"{self.client.name} - {self.date}"
+        return f"{self.client.name} - {self.date}"
+    
+class MonthlySummary(models.Model):
+    """
+    Stores per-month summary values that we need in other months
+    or in the half-year overview.
+    """
+    sheet = models.OneToOneField(
+        MonthlySheet,
+        on_delete=models.CASCADE,
+        related_name='summary',
+    )
+
+    # K44: Gesamtbestand neu (Lit. LHe) from Bottom Table 2
+    gesamtbestand_neu_lhe = models.DecimalField(
+        max_digits=18,
+        decimal_places=6,
+        null=True,
+        blank=True,
+    )
+
+    # Gasbestand (Lit. LHe) from Bottom Table 1
+    gasbestand_lhe = models.DecimalField(
+        max_digits=18,
+        decimal_places=6,
+        null=True,
+        blank=True,
+    )
+
+    # Verbraucherverluste (Lit. L-He) from overall summary
+    verbraucherverlust_lhe = models.DecimalField(
+        max_digits=18,
+        decimal_places=6,
+        null=True,
+        blank=True,
+    )
+
+    def __str__(self):
+        return f"Summary {self.sheet.year}-{self.sheet.month:02d}"