feat: Konto-Saldo-Anker mit ankerbasierter Saldenrechnung

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

finance/app/templates/index.html

@@ -16,7 +16,10 @@
 
 <table>
   <thead>
-    <tr><th>Konto</th><th>Bank</th><th>Saldo</th><th>Umbenennen</th></tr>
+    <tr>
+      <th>Konto</th><th>Bank</th><th>Saldo</th><th>Anker</th>
+      <th>Umbenennen</th><th>Anker pflegen</th>
+    </tr>
   </thead>
   <tbody>
     {% for account, balance in balances %}
@@ -24,6 +27,13 @@
       <td class="account">{{ account.name }}</td>
       <td>{{ account.bank }}</td>
       <td class="{{ 'neg' if balance < 0 else '' }}">{{ '%.2f'|format(balance) }} €</td>
+      <td>
+        {% if account.anchor_date is not none and account.anchor_balance is not none %}
+          Anker: {{ '%.2f'|format(account.anchor_balance) }} € am {{ account.anchor_date.strftime('%d.%m.%Y') }}
+        {% else %}
+          kein Anker
+        {% endif %}
+      </td>
       <td>
         <form class="inline-form" hx-ext="json-form" hx-patch="/api/accounts/{{ account.id }}"
               hx-swap="none" hx-on::after-request="if(event.detail.successful){window.location.reload()}">
@@ -31,9 +41,19 @@
           <button type="submit">Umbenennen</button>
         </form>
       </td>
+      <td>
+        <form class="inline-form" hx-ext="json-form" hx-patch="/api/accounts/{{ account.id }}"
+              hx-swap="none" hx-on::after-request="if(event.detail.successful){window.location.reload()}">
+          <input type="date" name="anchor_date"
+                 value="{{ account.anchor_date.isoformat() if account.anchor_date is not none else '' }}" required>
+          <input type="text" name="anchor_balance" placeholder="500.00"
+                 value="{{ account.anchor_balance if account.anchor_balance is not none else '' }}" required>
+          <button type="submit">Anker setzen</button>
+        </form>
+      </td>
     </tr>
     {% else %}
-    <tr><td colspan="4">Keine Konten angelegt.</td></tr>
+    <tr><td colspan="6">Keine Konten angelegt.</td></tr>
     {% endfor %}
   </tbody>
 </table>