Finished months balance except the below tables

sheets/__init__.py

@@ -0,0 +1,2 @@
+# sheets/__init__.py
+default_app_config = 'sheets.apps.SheetsConfig'

sheets/apps.py

@@ -1,6 +1,8 @@
 from django.apps import AppConfig
 
-
 class SheetsConfig(AppConfig):
     default_auto_field = 'django.db.models.BigAutoField'
     name = 'sheets'
+    
+    def ready(self):
+        import sheets.signals

sheets/migrations/0011_alter_betriebskosten_kostentyp_monthlysheet_cell_and_more.py

@@ -0,0 +1,67 @@
+# Generated by Django 5.1.5 on 2026-01-07 11:29
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('sheets', '0010_excelentry_constant_300_excelentry_druckkorrektur_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='betriebskosten',
+            name='kostentyp',
+            field=models.CharField(choices=[('sach', 'Sachkosten'), ('ln2', 'LN2'), ('helium', 'Helium'), ('inv', 'Inventar')], max_length=10, verbose_name='Kostentyp'),
+        ),
+        migrations.CreateModel(
+            name='MonthlySheet',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('year', models.IntegerField()),
+                ('month', models.IntegerField()),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+            ],
+            options={
+                'ordering': ['year', 'month'],
+                'unique_together': {('year', 'month')},
+            },
+        ),
+        migrations.CreateModel(
+            name='Cell',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('table_type', models.CharField(choices=[('top_left', 'Top Left Table'), ('top_right', 'Top Right Table'), ('bottom_1', 'Bottom Table 1'), ('bottom_2', 'Bottom Table 2'), ('bottom_3', 'Bottom Table 3')], max_length=20)),
+                ('row_index', models.IntegerField()),
+                ('column_index', models.IntegerField()),
+                ('value', models.DecimalField(blank=True, decimal_places=6, max_digits=15, null=True)),
+                ('formula', models.TextField(blank=True)),
+                ('is_formula', models.BooleanField(default=False)),
+                ('data_type', models.CharField(choices=[('number', 'Number'), ('text', 'Text'), ('date', 'Date')], default='number', max_length=20)),
+                ('client', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='sheets.client')),
+                ('sheet', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='cells', to='sheets.monthlysheet')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='CellReference',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('source_cell', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='dependents', to='sheets.cell')),
+                ('target_cell', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='dependencies', to='sheets.cell')),
+            ],
+            options={
+                'unique_together': {('source_cell', 'target_cell')},
+            },
+        ),
+        migrations.AddIndex(
+            model_name='cell',
+            index=models.Index(fields=['sheet', 'table_type', 'row_index'], name='sheets_cell_sheet_i_511238_idx'),
+        ),
+        migrations.AlterUniqueTogether(
+            name='cell',
+            unique_together={('sheet', 'client', 'table_type', 'row_index', 'column_index')},
+        ),
+    ]

sheets/migrations/0012_tableconfig_rowcalculation.py

@@ -0,0 +1,34 @@
+# Generated by Django 6.0.1 on 2026-02-01 11:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('sheets', '0011_alter_betriebskosten_kostentyp_monthlysheet_cell_and_more'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='TableConfig',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('table_type', models.CharField(choices=[('top_left', 'Top Left Table'), ('top_right', 'Top Right Table'), ('bottom_1', 'Bottom Table 1'), ('bottom_2', 'Bottom Table 2'), ('bottom_3', 'Bottom Table 3')], max_length=20, unique=True)),
+                ('calculations', models.JSONField(default=dict)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='RowCalculation',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('table_type', models.CharField(choices=[('top_left', 'Top Left Table'), ('top_right', 'Top Right Table'), ('bottom_1', 'Bottom Table 1'), ('bottom_2', 'Bottom Table 2'), ('bottom_3', 'Bottom Table 3')], max_length=20)),
+                ('row_index', models.IntegerField()),
+                ('formula', models.TextField()),
+                ('description', models.CharField(blank=True, max_length=200)),
+            ],
+            options={
+                'unique_together': {('table_type', 'row_index')},
+            },
+        ),
+    ]

sheets/models.py

@@ -8,9 +8,74 @@ class Institute(models.Model):
     def __str__(self):
         return self.name
 
+class Client(models.Model):
+    name = models.CharField(max_length=100)
+    address = models.TextField()
+    institute = models.ForeignKey(Institute, on_delete=models.CASCADE)
+    
+    def __str__(self):
+        return f"{self.name} ({self.institute.name})"
+
+class MonthlySheet(models.Model):
+    """Represents one monthly page"""
+    year = models.IntegerField()
+    month = models.IntegerField()  # 1-12
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+    
+    class Meta:
+        unique_together = ['year', 'month']
+        ordering = ['year', 'month']
+    
+    def __str__(self):
+        return f"{self.year}-{self.month:02d}"
+
+class Cell(models.Model):
+    """A single cell in the spreadsheet"""
+    sheet = models.ForeignKey(MonthlySheet, on_delete=models.CASCADE, related_name='cells')
+    client = models.ForeignKey(Client, on_delete=models.CASCADE)
+    table_type = models.CharField(max_length=20, choices=[
+        ('top_left', 'Top Left Table'),
+        ('top_right', 'Top Right Table'),
+        ('bottom_1', 'Bottom Table 1'),
+        ('bottom_2', 'Bottom Table 2'),
+        ('bottom_3', 'Bottom Table 3'),
+    ])
+    row_index = models.IntegerField()  # 0-23 for top tables, 0-9 for bottom
+    column_index = models.IntegerField()  # Actually client index (0-5)
+    is_formula = models.BooleanField(default=False)
+    # Cell content
+    value = models.DecimalField(max_digits=15, decimal_places=6, null=True, blank=True)
+    formula = models.TextField(blank=True)
+    
+    
+    # Metadata
+    data_type = models.CharField(max_length=20, default='number', choices=[
+        ('number', 'Number'),
+        ('text', 'Text'),
+        ('date', 'Date'),
+    ])
+    
+    class Meta:
+        unique_together = ['sheet', 'client', 'table_type', 'row_index', 'column_index']
+        indexes = [
+            models.Index(fields=['sheet', 'table_type', 'row_index']),
+        ]
+    
+    def __str__(self):
+        return f"{self.sheet} - {self.client.name} - {self.table_type}[{self.row_index}][{self.column_index}]"
+
+class CellReference(models.Model):
+    """Track dependencies between cells for calculations"""
+    source_cell = models.ForeignKey(Cell, on_delete=models.CASCADE, related_name='dependents')
+    target_cell = models.ForeignKey(Cell, on_delete=models.CASCADE, related_name='dependencies')
+    
+    class Meta:
+        unique_together = ['source_cell', 'target_cell']
+
 class Betriebskosten(models.Model):
     KOSTENTYP_CHOICES = [
-        ('sach', 'Sachkostöen'),
+        ('sach', 'Sachkosten'),
         ('ln2', 'LN2'),
         ('helium', 'Helium'),
         ('inv', 'Inventar'),
@@ -30,16 +95,40 @@ class Betriebskosten(models.Model):
         return None
     
     def __str__(self):
-        return f"{self.buchungsdatum} - {self.get_kostentyp_display()} - {self.betrag}€"  # Fixed the missing quote
-
-class Client(models.Model):
-    name = models.CharField(max_length=100)
-    address = models.TextField()
-    institute = models.ForeignKey(Institute, on_delete=models.CASCADE)  # Remove null=True, blank=True
+        return f"{self.buchungsdatum} - {self.get_kostentyp_display()} - {self.betrag}€"
+class RowCalculation(models.Model):
+    """Define calculations for specific rows"""
+    table_type = models.CharField(max_length=20, choices=[
+        ('top_left', 'Top Left Table'),
+        ('top_right', 'Top Right Table'),
+        ('bottom_1', 'Bottom Table 1'),
+        ('bottom_2', 'Bottom Table 2'),
+        ('bottom_3', 'Bottom Table 3'),
+    ])
+    row_index = models.IntegerField()  # Which row has the formula
+    formula = models.TextField()  # e.g., "row_10 + row_9"
+    description = models.CharField(max_length=200, blank=True)
+    
+    class Meta:
+        unique_together = ['table_type', 'row_index']
     
     def __str__(self):
-        return f"{self.name} ({self.institute.name})"
+        return f"{self.table_type}[{self.row_index}]: {self.formula}"
 
+# Or simpler: Just store row calculations in a JSONField
+class TableConfig(models.Model):
+    """Configuration for table calculations"""
+    table_type = models.CharField(max_length=20, unique=True, choices=[
+        ('top_left', 'Top Left Table'),
+        ('top_right', 'Top Right Table'),
+        ('bottom_1', 'Bottom Table 1'),
+        ('bottom_2', 'Bottom Table 2'),
+        ('bottom_3', 'Bottom Table 3'),
+    ])
+    calculations = models.JSONField(default=dict)  # {11: "10 + 9", 15: "14 - 13"}
+    
+    def __str__(self):
+        return f"{self.get_table_type_display()} Config"
 class ExcelEntry(models.Model):
     client = models.ForeignKey(Client, on_delete=models.CASCADE)
     date = models.DateField(default=timezone.now)
@@ -103,6 +192,10 @@ class ExcelEntry(models.Model):
         decimal_places=6,
         default=0.0
     )
+    
+    def __str__(self):
+        return f"{self.client.name} - {self.date}"
+
 class SecondTableEntry(models.Model):
     client = models.ForeignKey(Client, on_delete=models.CASCADE)
     date = models.DateField(default=timezone.now)
@@ -119,4 +212,4 @@ 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}"

sheets/signals.py

@@ -0,0 +1,82 @@
+# sheets/signals.py
+from django.db.models.signals import post_save, post_delete
+from django.dispatch import receiver
+from django.db.models import Sum
+from django.db.models.functions import Coalesce
+from decimal import Decimal
+
+# IMPORT THE MODELS AT THE TOP
+from .models import ExcelEntry, SecondTableEntry, MonthlySheet, Cell
+
+@receiver([post_save, post_delete], sender=ExcelEntry)
+def update_top_right_helium_input(sender, instance, **kwargs):
+    """Update top-right table when ExcelEntry changes"""
+    if instance.date:
+        # Get the monthly sheet for this date
+        sheet = MonthlySheet.objects.filter(
+            year=instance.date.year,
+            month=instance.date.month
+        ).first()
+        
+        if sheet:
+            # Re-populate helium input data
+            from .views import MonthlySheetView
+            view = MonthlySheetView()
+            view.populate_helium_input_to_top_right(sheet)
+
+@receiver([post_save, post_delete], sender=SecondTableEntry)
+def update_monthly_sheet_bezug(sender, instance, **kwargs):
+    """Update B11 (Bezug) in monthly sheet when SecondTableEntry changes - ONLY for non-start sheets"""
+    if instance.date and instance.client:
+        # Check if this is the start sheet (2025-01)
+        if instance.date.year == 2025 and instance.date.month == 1:
+            return  # Don't auto-update for start sheet
+        
+        # Get or create the monthly sheet for this date
+        sheet, created = MonthlySheet.objects.get_or_create(
+            year=instance.date.year,
+            month=instance.date.month
+        )
+        
+        # Calculate total LHe output for this client in this month
+        lhe_output_sum = SecondTableEntry.objects.filter(
+            client=instance.client,
+            date__year=instance.date.year,
+            date__month=instance.date.month
+        ).aggregate(
+            total=Coalesce(Sum('lhe_output'), Decimal('0'))
+        )['total']
+        
+        # Update B11 cell (row_index 8 = Excel B11) in TOP-LEFT table
+        b11_cell_left = Cell.objects.filter(
+            sheet=sheet,
+            table_type='top_left',
+            client=instance.client,
+            row_index=8  # Excel B11
+        ).first()
+        
+        if b11_cell_left and (b11_cell_left.value != lhe_output_sum or b11_cell_left.value is None):
+            b11_cell_left.value = lhe_output_sum
+            b11_cell_left.save()
+            
+            # Import here to avoid circular imports
+            from .views import SaveCellsView
+            save_view = SaveCellsView()
+            save_view.calculate_top_left_dependents(sheet, b11_cell_left)
+        
+        # ALSO update Bezug (row_index 8) in TOP-RIGHT table
+        b11_cell_right = Cell.objects.filter(
+            sheet=sheet,
+            table_type='top_right',
+            client=instance.client,
+            row_index=8  # Excel row 12 = Bezug
+        ).first()
+        
+        if b11_cell_right and (b11_cell_right.value != lhe_output_sum or b11_cell_right.value is None):
+            b11_cell_right.value = lhe_output_sum
+            b11_cell_right.save()
+            
+            # Also trigger top-right calculations
+            from .views import SaveCellsView
+            save_view = SaveCellsView()
+            save_view.calculate_top_right_dependents(sheet, b11_cell_right)

sheets/templates/clients_table.html

@@ -47,6 +47,7 @@
         <a href="{% url 'table_two' %}" class="nav-button">Go to Helium Output</a>
         <a href="/admin/" class="nav-button admin-button">Go to Admin Panel</a>
         <a href="{% url 'betriebskosten_list' %}" class="nav-button">Betriebskosten</a>
+        <a href="{% url 'monthly_sheet' year=2024 month=1 %}">Monthly Sheets</a>
     </div>
 </div>
 

sheets/templates/monthly_sheet.html

@@ -0,0 +1,674 @@
+{% extends "base.html" %}
+
+{% block content %}
+<div class="spreadsheet-container">
+    <!-- Navigation Header -->
+    <div class="sheet-navigation">
+        <a href="{% url 'monthly_sheet' prev_month.year prev_month.month %}">← Previous</a>
+        <h2>{{ year }} - {{ month_name }} (Sheet {{ month }}/6)</h2>
+        <a href="{% url 'monthly_sheet' next_month.year next_month.month %}">Next →</a>
+        <a href="{% url 'summary_sheet' year month %}">Go to Summary</a>
+    </div>
+    
+    <!-- Top Tables Container -->
+    <div class="top-tables">
+        <!-- Left Table (18 rows × clients) -->
+        <div class="table-container top-left-table">
+            <h3>Table 1: Top Left</h3>
+            <table class="spreadsheet-table">
+                <thead>
+                    <tr>
+                        <th>Row Label</th>
+                        {% for header in top_left_headers %}
+                            <th>{{ header }}</th>
+                        {% endfor %}
+                        <th>Sum</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {% for row in top_left_rows %}
+                    {% with rownum=forloop.counter %}
+                    <tr data-row="{{ forloop.counter0 }}">
+                        <td class="row-label">
+                            {% if rownum == 1 %}
+                                Stand der Gaszähler (Nm³)
+                            {% elif rownum == 2 %}
+                                Stand der Gaszähler (Vormonat) (Nm³)
+                            {% elif rownum == 3 %}
+                                Gasrückführung (Nm³)
+                            {% elif rownum == 4 %}
+                                Rückführung flüssig (Lit. L-He)
+                            {% elif rownum == 5 %}
+                                Sonderrückführungen (Lit. L-He)
+                            {% elif rownum == 6 %}
+                                Bestand in Kannen-1 (Lit. L-He)
+                            {% elif rownum == 7 %}
+                                Summe Bestand (Lit. L-He)
+                            {% elif rownum == 8 %}
+                                Best. in Kannen Vormonat (Lit. L-He)
+                            {% elif rownum == 9 %}
+                                Bezug (Liter L-He)
+                            {% elif rownum == 10 %}
+                                Rückführ. Soll (Lit. L-He)
+                            {% elif rownum == 11 %}
+                                Verluste (Soll-Rückf.) (Lit. L-He)
+                            {% elif rownum == 12 %}
+                                Füllungen warm (Lit. L-He)
+                            {% elif rownum == 13 %}
+                                Kaltgas Rückgabe (Lit. L-He) – Faktor
+                            {% elif rownum == 14 %}
+                                Faktor 0.06
+                            {% elif rownum == 15 %}
+                                Verbraucherverluste (Liter L-He)
+                            {% elif rownum == 16 %}
+                                %
+                            {% elif rownum == 17 %}
+                                Gesamtrückführung (Nm³)
+                            {% elif rownum == 18 %}
+                                Aufgeteilte Verluste (Liter L-He)
+                            {% endif %}
+                        </td>
+
+                        {% for cell in row.cells %}
+                            {% if is_start_sheet or rownum == 1 or rownum == 5 or rownum == 6 %}
+                                {# Editable in start sheet OR always editable rows (B3, B7, B8) #}
+                                <td class="editable-cell"
+                                    data-cell-id="{{ cell.id|default:'' }}"
+                                    data-table="top_left"
+                                    data-row="{{ forloop.parentloop.counter0 }}"
+                                    data-col="{{ forloop.counter0 }}"
+                                    data-client-id="{{ cell.client.id|default:'' }}"
+                                    contenteditable="true">
+                                    {{ cell.value|default:"" }}
+                                </td>
+                            {% else %}
+                                {# Readonly for non-start sheets #}
+                                <td class="readonly-cell"
+                                    data-cell-id="{{ cell.id|default:'' }}"
+                                    data-table="top_left"
+                                    data-row="{{ forloop.parentloop.counter0 }}"
+                                    data-col="{{ forloop.counter0 }}"
+                                    data-client-id="{{ cell.client.id|default:'' }}"
+                                    contenteditable="false">
+                                    {{ cell.value|default:"" }}
+                                </td>
+                            {% endif %}
+                        {% endfor %}
+
+
+                        <td class="sum-cell">
+                            {{ row.sum|default_if_none:"" }}
+                        </td>
+                    </tr>
+                    {% endwith %}
+                    {% endfor %}
+                </tbody>
+            </table>
+        </div>
+        
+        <!-- Right Table (24 rows × 6 clients) -->
+        <!-- Update the top-right table section in monthly_sheet.html -->
+        <div class="table-container top-right-table">
+            <h3>Table 2: Top Right</h3>
+            <table class="spreadsheet-table">
+                <thead>
+                    <tr>
+                        <th>Row Label</th>
+                        {% for header in top_right_headers %}
+                            <th>{{ header }}</th>
+                        {% endfor %}
+                        <th>Sum</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {% for row in top_right_rows %}
+                    {% with rownum=forloop.counter %}
+                    <tr data-row="{{ forloop.counter0 }}">
+                        <td class="row-label">
+                            {% if rownum == 1 %}
+                                Stand der Gaszähler (Vormonat) (Nm³)
+                            {% elif rownum == 2 %}
+                                Gasrückführung (Nm³)
+                            {% elif rownum == 3 %}
+                                Rückführung flüssig (Lit. L-He)
+                            {% elif rownum == 4 %}
+                                Sonderrückführungen (Lit. L-He)
+                            {% elif rownum == 5 %}
+                                Sammelrückführungen (Lit. L-He)
+                            {% elif rownum == 6 %}
+                                Bestand in Kannen-1 (Lit. L-He)
+                            {% elif rownum == 7 %}
+                                Summe Bestand (Lit. L-He)
+                            {% elif rownum == 8 %}
+                                Best. in Kannen Vormonat (Lit. L-He)
+                            {% elif rownum == 9 %}
+                                Bezug (Liter L-He)
+                            {% elif rownum == 10 %}
+                                Rückführ. Soll (Lit. L-He)
+                            {% elif rownum == 11 %}
+                                Verluste (Soll-Rückf.) (Lit. L-He)
+                            {% elif rownum == 12 %}
+                                Füllungen warm (Lit. L-He)
+                            {% elif rownum == 13 %}
+                                Kaltgas Rückgabe (Lit. L-He) – Faktor
+                            {% elif rownum == 14 %}
+                                Faktor 0.06
+                            {% elif rownum == 15 %}
+                                Verbraucherverluste (Liter L-He)
+                            {% elif rownum == 16 %}
+                                %
+                            {% endif %}
+                        </td>
+
+                        {% for cell in row.cells %}
+                            {% with client_name=cell.client.name|default:"" %}
+                                {# Determine if this cell should be editable #}
+                                {% if is_start_sheet %}
+                                    <td class="editable-cell"
+                                        data-cell-id="{{ cell.id|default:'' }}"
+                                        data-table="top_right"
+                                        data-row="{{ forloop.parentloop.counter0 }}"
+                                        data-col="{{ forloop.counter0 }}"
+                                        data-client-id="{{ cell.client.id|default:'' }}"
+                                        contenteditable="true">
+                                        {{ cell.value|default:"" }}
+                                    </td>
+                                {% elif rownum == 4 or rownum == 6 or rownum == 1 and client_name in "M3 Thiele,M3 Buntkowsky,M3 Gutfleisch" %}
+                                    <td class="editable-cell"
+                                        data-cell-id="{{ cell.id|default:'' }}"
+                                        data-table="top_right"
+                                        data-row="{{ forloop.parentloop.counter0 }}"
+                                        data-col="{{ forloop.counter0 }}"
+                                        data-client-id="{{ cell.client.id|default:'' }}"
+                                        contenteditable="true">
+                                        {{ cell.value|default:"" }}
+                                    </td>
+                                {% else %}
+                                    <td class="readonly-cell"
+                                        data-cell-id="{{ cell.id|default:'' }}"
+                                        data-table="top_right"
+                                        data-row="{{ forloop.parentloop.counter0 }}"
+                                        data-col="{{ forloop.counter0 }}"
+                                        data-client-id="{{ cell.client.id|default:'' }}"
+                                        contenteditable="false">
+                                        {% if rownum == 2 %}
+                                            Aufteilung Nach Verbrauch
+                                        {% else %}
+                                            {{ cell.value|default:"" }}
+                                        {% endif %}
+                                    </td>
+                                {% endif %}
+                            {% endwith %}
+                        {% endfor %}
+
+                        <td class="sum-cell">
+                            {{ row.sum|default_if_none:"" }}
+                        </td>
+                    </tr>
+                    {% endwith %}
+                    {% endfor %}
+
+                </tbody>
+            </table>
+        </div>
+    
+    <!-- Bottom Tables -->
+    <div class="bottom-tables">
+        <div class="table-container bottom-table-1">
+            <h3>Bottom Table 1</h3>
+            <table class="spreadsheet-table">
+                <thead>
+                    <tr>
+                        <th>Row Label</th>
+                        {% for client in clients %}
+                        <th>{{ client.name }}</th>
+                        {% endfor %}
+                    </tr>
+                </thead>
+                <tbody>
+                    {% for row in cells_by_table.bottom_1 %}
+                    <tr data-row="{{ forloop.counter0 }}">
+                        <td class="row-label">Row {{ forloop.counter }}</td>
+                        {% for cell in row %}
+                        <td class="editable-cell" 
+                            data-cell-id="{{ cell.id|default:'' }}"
+                            data-table="bottom_1"
+                            data-row="{{ forloop.parentloop.counter0 }}"
+                            data-col="{{ forloop.counter0 }}"
+                            data-client-id="{{ cell.client.id|default:'' }}"
+                            contenteditable="true">
+                            {{ cell.value|default:"" }}
+                        </td>
+                        {% endfor %}
+                    </tr>
+                    {% endfor %}
+                </tbody>
+            </table>
+        </div>
+        
+        <div class="table-container bottom-table-2">
+            <h3>Bottom Table 2</h3>
+            <table class="spreadsheet-table">
+                <thead>
+                    <tr>
+                        <th>Row Label</th>
+                        {% for client in clients %}
+                        <th>{{ client.name }}</th>
+                        {% endfor %}
+                    </tr>
+                </thead>
+                <tbody>
+                    {% for row in cells_by_table.bottom_2 %}
+                    <tr data-row="{{ forloop.counter0 }}">
+                        <td class="row-label">Row {{ forloop.counter }}</td>
+                        {% for cell in row %}
+                        <td class="editable-cell" 
+                            data-cell-id="{{ cell.id|default:'' }}"
+                            data-table="bottom_2"
+                            data-row="{{ forloop.parentloop.counter0 }}"
+                            data-col="{{ forloop.counter0 }}"
+                            data-client-id="{{ cell.client.id|default:'' }}"
+                            contenteditable="true">
+                            {{ cell.value|default:"" }}
+                        </td>
+                        {% endfor %}
+                    </tr>
+                    {% endfor %}
+                </tbody>
+            </table>
+        </div>
+        
+        <div class="table-container bottom-table-3">
+            <h3>Bottom Table 3</h3>
+            <table class="spreadsheet-table">
+                <thead>
+                    <tr>
+                        <th>Row Label</th>
+                        {% for client in clients %}
+                        <th>{{ client.name }}</th>
+                        {% endfor %}
+                    </tr>
+                </thead>
+                <tbody>
+                    {% for row in cells_by_table.bottom_3 %}
+                    <tr data-row="{{ forloop.counter0 }}">
+                        <td class="row-label">Row {{ forloop.counter }}</td>
+                        {% for cell in row %}
+                        <td class="editable-cell" 
+                            data-cell-id="{{ cell.id|default:'' }}"
+                            data-table="bottom_3"
+                            data-row="{{ forloop.parentloop.counter0 }}"
+                            data-col="{{ forloop.counter0 }}"
+                            data-client-id="{{ cell.client.id|default:'' }}"
+                            contenteditable="true">
+                            {{ cell.value|default:"" }}
+                        </td>
+                        {% endfor %}
+                    </tr>
+                    {% endfor %}
+                </tbody>
+            </table>
+        </div>
+    </div>
+    
+    <!-- Save Button -->
+    <div class="action-bar">
+        <button id="save-all-btn" class="btn btn-primary">Save All Cells</button>
+        <div id="save-status"></div>
+        <div class="legend">
+            <small>
+                <span style="background-color: #d1ecf1; padding: 2px 5px;">Saved cells</span>
+                <span style="background-color: #d4edda; padding: 2px 5px;">Calculated cells</span>
+            </small>
+        </div>
+    </div>
+</div>
+
+<!-- Hidden form for cell data -->
+<form id="cell-data-form" style="display: none;">
+    {% csrf_token %}
+    <input type="hidden" name="sheet_id" value="{{ sheet.id }}">
+</form>
+
+<style>
+.spreadsheet-container {
+    padding: 20px;
+}
+
+.sheet-navigation {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 20px;
+    padding: 10px;
+    background-color: #f8f9fa;
+    border-radius: 5px;
+}
+
+.sheet-navigation h2 {
+    margin: 0;
+}
+
+.top-tables {
+    display: flex;
+    gap: 20px;
+    margin-bottom: 20px;
+}
+
+.top-tables .table-container {
+    flex: 1;
+    border: 1px solid #ddd;
+    border-radius: 5px;
+    padding: 10px;
+    background-color: white;
+}
+.merged-cell-left {
+    border-right-width: 0;
+}
+
+.merged-cell-right {
+    border-left-width: 0;
+}
+
+.cell-group-LM {
+    background-color: #f0f8ff; /* Light blue for L&M group */
+}
+
+.cell-group-NO {
+    background-color: #f0fff0; /* Light green for N&O group */
+}
+
+.cell-group-PQR {
+    background-color: #fff0f0; /* Light red for P,Q,R group */
+}
+.bottom-tables {
+    display: grid;
+    grid-template-columns: repeat(3, 1fr);
+    gap: 20px;
+    margin-bottom: 20px;
+}
+
+.bottom-tables .table-container {
+    border: 1px solid #ddd;
+    border-radius: 5px;
+    padding: 10px;
+    background-color: white;
+}
+
+.spreadsheet-table {
+    width: 100%;
+    border-collapse: collapse;
+}
+
+.spreadsheet-table th,
+.spreadsheet-table td {
+    border: 1px solid #ddd;
+    padding: 8px;
+    text-align: center;
+}
+
+.spreadsheet-table th {
+    background-color: #f2f2f2;
+    font-weight: bold;
+}
+
+.row-label {
+    background-color: #f9f9f9;
+    font-weight: bold;
+}
+
+.editable-cell {
+    min-width: 100px;
+    min-height: 30px;
+    background-color: white;
+    cursor: text;
+}
+
+.editable-cell:focus {
+    outline: 2px solid #007bff;
+    background-color: #f0f8ff;
+}
+
+.editable-cell:hover {
+    background-color: #f1f1f1;
+}
+
+.readonly-cell {
+    background-color: #f8f9fa;
+    color: #495057;
+    cursor: default;
+    min-height: 30px;
+}
+
+.cell-calculated {
+    font-style: italic;
+    font-weight: bold;
+    background-color: #e8f4f8;
+}
+
+.sum-cell {
+    font-weight: bold;
+    background-color: #f0f0f0;
+    padding: 5px;
+}
+
+.action-bar {
+    display: flex;
+    gap: 10px;
+    align-items: center;
+    padding: 10px;
+    background-color: #f8f9fa;
+    border-radius: 5px;
+}
+
+.btn {
+    padding: 10px 20px;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+    font-size: 14px;
+}
+
+.btn-primary {
+    background-color: #007bff;
+    color: white;
+}
+
+#save-status {
+    margin-left: 10px;
+    color: #28a745;
+    font-weight: bold;
+}
+
+.saving-text {
+    position: absolute;
+    font-size: 11px;
+    color: #666;
+    margin-left: 5px;
+}
+
+.saving {
+    background-color: #fff3cd !important;
+    font-style: italic;
+}
+
+.saved-success {
+    background-color: #d4edda !important;
+    transition: background-color 0.5s ease;
+}
+
+.calculated-cell {
+    background-color: #e8f4f8 !important;
+    font-style: italic;
+    color: #0c5460;
+}
+
+.editable-cell[contenteditable="false"] {
+    background-color: #f8f9fa !important;
+    cursor: not-allowed;
+}
+</style>
+
+<script>
+$(document).ready(function() {
+    // Enable editing on focus
+    $('.editable-cell').on('focus', function() {
+        $(this).data('original-value', $(this).text().trim());
+    });
+
+    // Save on blur
+    $('.editable-cell').on('blur', function() {
+        saveCell($(this));
+    });
+
+    // Save on Enter key
+    $('.editable-cell').on('keydown', function(e) {
+        if (e.key === 'Enter') {
+            e.preventDefault();
+            $(this).blur();
+        }
+    });
+
+    // Prevent editing of readonly cells
+    $('.readonly-cell').on('focus click', function(e) {
+        e.preventDefault();
+        $(this).blur();
+    });
+
+    function saveCell($cell) {
+        const cellId = $cell.data('cell-id');
+        const newValue = $cell.text().trim();
+        const originalValue = $cell.data('original-value') || '';
+        
+        // Skip if no change
+        if (newValue === originalValue) {
+            return;
+        }
+        
+        // Skip if no cell ID
+        if (!cellId) {
+            console.error('No cell ID found');
+            return;
+        }
+        
+        // Show saving indicator
+        $cell.addClass('saving');
+        
+        // Prepare AJAX request
+        const csrfToken = $('[name=csrfmiddlewaretoken]').val();
+        
+        $.ajax({
+            url: '{% url "save_cells" %}',
+            method: 'POST',
+            headers: {
+                'X-CSRFToken': csrfToken
+            },
+            data: {
+                'sheet_id': '{{ sheet.id }}',
+                'cell_id': cellId,
+                'value': newValue
+            },
+            success: function(response) {
+                $cell.removeClass('saving');
+                
+                if (response.status === 'success') {
+                    // Update all cells returned by the server
+                    if (response.updated_cells) {
+                        response.updated_cells.forEach(function(cellData) {
+                            const targetCell = $('[data-cell-id="' + cellData.id + '"]');
+                            if (targetCell.length) {
+                                targetCell.text(cellData.value || '');
+                                targetCell.data('original-value', cellData.value || '');
+                                
+                                // Style calculated cells differently
+                                // Style calculated cells differently
+                                if (cellData.is_calculated) {
+                                    targetCell.addClass('calculated-cell');
+                                    // Leave contenteditable as set by the template
+                                }
+                            }
+                        });
+                    }
+                    
+                    // Show success message
+                    showStatus('Saved successfully!', 'success');
+                    
+                    // Highlight the saved cell briefly
+                    $cell.addClass('saved-success');
+                    setTimeout(function() {
+                        $cell.removeClass('saved-success');
+                    }, 1000);
+                    
+                } else {
+                    // Restore original value on error
+                    $cell.text(originalValue);
+                    showStatus('Error: ' + response.message, 'error');
+                }
+            },
+            error: function(xhr, status, error) {
+                $cell.removeClass('saving');
+                $cell.text(originalValue);
+                showStatus('Error: ' + error, 'error');
+                console.error('Save error:', error);
+            }
+        });
+    }
+
+    // Save All button
+    $('#save-all-btn').on('click', function() {
+        const csrfToken = $('[name=csrfmiddlewaretoken]').val();
+        const formData = new FormData();
+        formData.append('sheet_id', '{{ sheet.id }}');
+        formData.append('csrfmiddlewaretoken', csrfToken);
+        
+        // Collect all cell values
+        $('.editable-cell').each(function() {
+            const cellId = $(this).data('cell-id');
+            if (cellId) {
+                formData.append('cell_' + cellId, $(this).text().trim());
+            }
+        });
+        
+        $.ajax({
+            url: '{% url "save_cells" %}',
+            method: 'POST',
+            data: formData,
+            processData: false,
+            contentType: false,
+            headers: {
+                'X-CSRFToken': csrfToken
+            },
+            success: function(response) {
+                if (response.status === 'success') {
+                    if (response.updated_cells) {
+                        response.updated_cells.forEach(function(cellData) {
+                            const targetCell = $('[data-cell-id="' + cellData.id + '"]');
+                            if (targetCell.length) {
+                                targetCell.text(cellData.value || '');
+                                targetCell.data('original-value', cellData.value || '');
+                            }
+                        });
+                    }
+                    showStatus('All cells saved!', 'success');
+                } else {
+                    showStatus('Error: ' + response.message, 'error');
+                }
+            },
+            error: function() {
+                showStatus('Error saving all cells', 'error');
+            }
+        });
+    });
+
+    function showStatus(message, type) {
+        const statusEl = $('#save-status');
+        statusEl.text(message);
+        statusEl.css('color', type === 'success' ? '#28a745' : '#dc3545');
+        
+        setTimeout(function() {
+            statusEl.text('');
+        }, 3000);
+    }
+});
+</script>
+{% endblock %}

sheets/templates/table_one.html

@@ -191,15 +191,184 @@
         .readonly-field {
             background-color: #e9ecef;
             color: #6c757d;
+        }
+                /* ---- 6-month overview card ---- */
+        .overview-card {
+            background-color: #ffffff;
+            padding: 16px 20px;
+            margin: 20px 0;
+            border-radius: 8px;
+            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08);
+        }
+
+        .overview-header {
+            display: flex;
+            flex-wrap: wrap;
+            gap: 12px;
+            align-items: flex-end;
+            margin-bottom: 12px;
+        }
+
+        .overview-header label {
+            font-size: 0.9rem;
+            color: #555;
+        }
+
+        .overview-header select {
+            padding: 6px 8px;
+            border-radius: 4px;
+            border: 1px solid #ccc;
+        }
+
+        .overview-header button {
+            padding: 7px 14px;
+            border-radius: 4px;
+            border: none;
+            background-color: #007bff;
+            color: #fff;
+            cursor: pointer;
+        }
+
+        .overview-header button:hover {
+            background-color: #0056b3;
+        }
+
+        .overview-title {
+            font-size: 1.1rem;
+            font-weight: bold;
+            margin-bottom: 8px;
+            color: #333;
+        }
+
+        .overview-subtitle {
+            font-size: 0.9rem;
+            color: #555;
+            margin-bottom: 8px;
+        }
+
+        .overview-table {
+            width: 100%;
+            border-collapse: collapse;
+        }
+
+        .overview-table th,
+        .overview-table td {
+            padding: 6px 8px;
+            border-bottom: 1px solid #eee;
+            font-size: 0.9rem;
+        }
+
+        .overview-table thead th {
+            background-color: #007bff;
+            color: #fff;
+            text-align: right;
+        }
+
+        .overview-table thead th:first-child {
+            text-align: left;
+        }
+
+        .overview-table tbody tr:hover {
+            background-color: #f8f9ff;
+        }
+
+        .overview-table .number-cell {
+            text-align: right;
+        }
+
+        .overview-table .summary-row {
+            background-color: #f0f4ff;
+            font-weight: bold;
         }
     </style>
 </head>
 <body>
 
+    <!-- This link should ONLY wrap the text below -->
     <a href="{% url 'clients_list' %}" class="btn btn-outline-primary">
         &#8678; Go to Clients
     </a>
 
+    <!-- 6-Month overview card (OUTSIDE any <a>) -->
+    <div class="overview-card">
+        <div class="overview-title">Helium Input – 6 Month Overview</div>
+
+        <form method="get" class="overview-header">
+            <div>
+                <label for="overview-year">Year</label><br>
+                <select name="overview_year" id="overview-year">
+                    {% for y in available_years %}
+                        <option value="{{ y }}"
+                            {% if overview and overview.year == y %}selected{% endif %}>
+                            {{ y }}
+                        </option>
+                    {% endfor %}
+                </select>
+            </div>
+
+            <div>
+                <label for="overview-start-month">Start month</label><br>
+                <select name="overview_start_month" id="overview-start-month">
+                    {% for m, label in month_choices %}
+                        <option value="{{ m }}"
+                            {% if overview and overview.start_month == m %}selected{% endif %}>
+                            {{ m }} - {{ label }}
+                        </option>
+                    {% endfor %}
+                </select>
+            </div>
+
+            <div>
+                <button type="submit">Show overview</button>
+            </div>
+        </form>
+
+        {% if overview %}
+            <div class="overview-subtitle">
+                Period:
+                <strong>{{ overview.start_month }}–{{ overview.end_month }} / {{ overview.year }}</strong>
+            </div>
+
+            <table class="overview-table">
+                <thead>
+                    <tr>
+                        <th>Month</th>
+                        {% for g in overview.groups %}
+                            <th>{{ g.label }}</th>
+                        {% endfor %}
+                        <th>Month total</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {% for row in overview.rows %}
+                        <tr>
+                            <td>
+                                {{ row.month_number }} - {{ row.month_label|slice:":3" }}
+                            </td>
+                            {% for value in row.values %}
+                                <td class="number-cell">{{ value|floatformat:2 }}</td>
+                            {% endfor %}
+                            <td class="number-cell">{{ row.total|floatformat:2 }}</td>
+                        </tr>
+                    {% endfor %}
+
+                    <tr class="summary-row">
+                        <td>Summe</td>
+                        {% for total in overview.group_totals %}
+                            <td class="number-cell">{{ total|floatformat:2 }}</td>
+                        {% endfor %}
+                        <td class="number-cell">{{ overview.grand_total|floatformat:2 }}</td>
+                    </tr>
+                </tbody>
+            </table>
+        {% else %}
+            <div class="overview-subtitle">
+                No data yet – choose a year and start month and click “Show overview”.
+            </div>
+        {% endif %}
+    </div>
+
+
     <h2>Helium Input</h2>
     <div class="table-container">
         <button class="add-row-btn" id="add-row-one">Add Row</button>
@@ -218,7 +387,8 @@
             <col style="width: 5%"> <!-- L-He -->
             <col style="width: 5%"> <!-- L-He zus. -->
             <col style="width: 6%"> <!-- L-He ges. -->
-            <col style="width: 6%"> <!-- Date Joined -->
+            <col style="width: 7%"> <!-- Date -->
+            <col style="width: 5%"> <!-- Month -->
             <col style="width: 8%"> <!-- Actions -->
         </colgroup>
         <thead>
@@ -236,7 +406,8 @@
                 <th>L-He</th>
                 <th>L-He zus.</th>
                 <th>L-He ges.</th>
-                <th>Date Joined</th>
+                <th>Date</th>
+                <th>Month</th>
                 <th>Actions</th>
             </tr>
         </thead>
@@ -256,7 +427,16 @@
                     <td>{{ entry.lhe|floatformat:6 }}</td>
                     <td>{{ entry.lhe_zus|floatformat:3 }}</td>
                     <td>{{ entry.lhe_ges|floatformat:6 }}</td>
-                    <td>{{ entry.date_joined|date:"Y-m-d" }}</td>
+                    <td>
+                        {% if entry.date %}
+                            {{ entry.date|date:"d.m.Y" }}
+                        {% endif %}
+                    </td>
+                    <td>
+                        {% if entry.date %}
+                            {{ entry.date|date:"m" }}   {# e.g. 01–12 #}
+                        {% endif %}
+                    </td>
                     <td class="actions">
                         <button class="edit-btn-one">Edit</button>
                         <button class="delete-btn-one">Delete</button>
@@ -645,6 +825,7 @@
                                     <td>${response.lhe_zus}</td>
                                     <td>${response.lhe_ges}</td>
                                     <td>${response.date || ''}</td>
+                                    <td>${response.month || ''}</td>
                                     <td class="actions">
                                         <button class="edit-btn-one">Edit</button>
                                         <button class="delete-btn-one">Delete</button>
@@ -805,6 +986,7 @@
                             row.find('td:eq(11)').text(response.lhe_zus);
                             row.find('td:eq(12)').text(response.lhe_ges);
                             row.find('td:eq(13)').text(response.date || '');
+                            row.find('td:eq(14)').text(response.month || '');
                             $('#edit-popup-one').fadeOut();
                         } else {
                             alert('Error: ' + (response.message || 'Failed to update entry'));

sheets/urls.py

@@ -1,15 +1,26 @@
 from django.urls import path
+from .views import DebugTopRightView
+from .views import SaveCellsView 
 from . import views
-# Create your URLs here.
+
 urlpatterns = [
-    path('', views.clients_list, name='clients_list'),              # Main page
-    path('table-one/', views.table_one_view, name='table_one'),     # Table One
-    path('table-two/', views.table_two_view, name='table_two'),     # Table Two
+    path('', views.clients_list, name='clients_list'),
+    path('table-one/', views.table_one_view, name='table_one'),
+    path('table-two/', views.table_two_view, name='table_two'),
     path('add-entry/<str:model_name>/', views.add_entry, name='add_entry'),
     path('update-entry/<str:model_name>/', views.update_entry, name='update_entry'),
     path('delete-entry/<str:model_name>/', views.delete_entry, name='delete_entry'),
     path('betriebskosten/', views.betriebskosten_list, name='betriebskosten_list'),
     path('betriebskosten/create/', views.betriebskosten_create, name='betriebskosten_create'),
     path('betriebskosten/delete/', views.betriebskosten_delete, name='betriebskosten_delete'),
-    
-]
+    path('check-sheets/', views.CheckSheetView.as_view(), name='check_sheets'),
+    path('quick-debug/', views.QuickDebugView.as_view(), name='quick_debug'),
+    path('test-formula/', views.TestFormulaView.as_view(), name='test_formula'),
+    path('simple-debug/', views.SimpleDebugView.as_view(), name='simple_debug'),
+    path('sheet/<int:year>/<int:month>/', views.MonthlySheetView.as_view(), name='monthly_sheet'),
+    path('summary/<int:year>/<int:start_month>/', views.SummarySheetView.as_view(), name='summary_sheet'),
+    path("save-cells/", SaveCellsView.as_view(), name="save_cells"),
+    path('calculate/', views.CalculateView.as_view(), name='calculate'),
+    path('debug-calculation/', views.DebugCalculationView.as_view(), name='debug_calculation'),
+    path('debug-top-right/', DebugTopRightView.as_view(), name='debug_top_right'),  
+]