Per-Anbieter default VO with auto-select in the schaltung wizard

- New nullable anbieter.default_vo_id column (migration adds it to
  existing DBs); deleting a VO that some provider points at clears
  the reference automatically.
- GET /api/anbieter now includes default_vo_id + default_vo_nummer
  + default_vo_bezeichnung so the wizard can preselect without an
  extra round-trip.
- New PUT /api/anbieter/:id/default-vo endpoint. Validates the VO
  belongs to the given provider; accepts vo_id=null to clear.
- VO admin table grew a "Standard" column and an "Als Standard" /
  "Standard entfernen" button on each row.
- When the user picks a provider in step 1 of the wizard, the VO
  dropdown now preselects the default VO (falling back to the only
  VO if there is exactly one), and immediately loads the
  matching tariffs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

database.js

@@ -55,12 +55,15 @@ function initDatabase() {
     const db = getDatabase();
 
     db.serialize(() => {
-        // Anbieter (Providers)
+        // Anbieter (Providers). default_vo_id picks which of this provider's
+        // VOs is preselected in the schaltung wizard.
         db.run(`CREATE TABLE IF NOT EXISTS anbieter (
             id INTEGER PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL UNIQUE,
+            default_vo_id INTEGER,
             created_at DATETIME DEFAULT CURRENT_TIMESTAMP
         )`);
+        addColumnIfMissing(db, 'anbieter', 'default_vo_id INTEGER');
 
         // Mitarbeiter-Prozentsätze pro Anbieter
         db.run(`CREATE TABLE IF NOT EXISTS mitarbeiter_prozentsaetze (

public/index.html

@@ -1273,6 +1273,7 @@
 
                     <div class="admin-content-section">
                         <h4>Bestehende VOs</h4>
+                        <p style="color:#666; font-size:13px;">Die mit ★ markierte VO wird bei der Schaltungserfassung automatisch vorausgewählt.</p>
                         <div class="table-container">
                             <table class="admin-table">
                                 <thead>
@@ -1281,6 +1282,7 @@
                                         <th>Nummer</th>
                                         <th>Bezeichnung</th>
                                         <th>Aktiv</th>
+                                        <th>Standard</th>
                                         <th>Aktionen</th>
                                     </tr>
                                 </thead>

public/script.js

@@ -68,7 +68,7 @@ async function renderWizardAnbieterButtons() {
             btn.className = 'btn-success';
             btn.style.cssText = 'padding:14px 22px; font-size:15px; min-width:140px;';
             btn.textContent = a.name;
-            btn.addEventListener('click', () => wizardSelectAnbieter(a.id, a.name));
+            btn.addEventListener('click', () => wizardSelectAnbieter(a.id, a.name, a.default_vo_id));
             container.appendChild(btn);
         });
     } catch (e) {
@@ -76,15 +76,17 @@ async function renderWizardAnbieterButtons() {
     }
 }
 
-async function wizardSelectAnbieter(anbieterId, anbieterName) {
+async function wizardSelectAnbieter(anbieterId, anbieterName, defaultVoId) {
     document.getElementById('anbieter').value = anbieterId;
     document.getElementById('wizardAnbieterLabel').textContent = '· ' + anbieterName;
     document.getElementById('wizardStep1').style.display = 'none';
     document.getElementById('wizardStep2').style.display = 'block';
 
-    // Load VOs for this provider
     const voSelect = document.getElementById('wizardVo');
     voSelect.innerHTML = '<option value="">VO wählen...</option>';
+    document.getElementById('wizardTarif').innerHTML = '<option value="">Erst VO wählen...</option>';
+    document.getElementById('tarifoptionenSection').style.display = 'none';
+
     try {
         const vos = await apiRequest(`/api/vos?anbieter_id=${encodeURIComponent(anbieterId)}`);
         vos.forEach(v => {
@@ -93,12 +95,20 @@ async function wizardSelectAnbieter(anbieterId, anbieterName) {
         });
         if (vos.length === 0) {
             showMessage('Für diesen Anbieter wurden noch keine VOs angelegt. Bitte in der Administration → VOs eine VO anlegen.', 'error');
+            return;
+        }
+        // Preselect the provider's default VO if set, otherwise the first VO if it is the only one.
+        let preselect = null;
+        if (defaultVoId && vos.some(v => v.id === defaultVoId)) {
+            preselect = defaultVoId;
+        } else if (vos.length === 1) {
+            preselect = vos[0].id;
+        }
+        if (preselect) {
+            voSelect.value = String(preselect);
+            await loadTarifeForWizard();
         }
     } catch (e) { /* error shown */ }
-
-    // Reset Tarif + Tarifoptionen
-    document.getElementById('wizardTarif').innerHTML = '<option value="">Erst VO wählen...</option>';
-    document.getElementById('tarifoptionenSection').style.display = 'none';
 }
 
 function wizardBackToStep1() {
@@ -4067,22 +4077,34 @@ async function loadAnbieterForVoForm() {
 async function loadVosAdmin() {
     const tbody = document.getElementById('vosList');
     if (!tbody) return;
-    tbody.innerHTML = '<tr><td colspan="5" style="text-align:center; color:#666;">Lade...</td></tr>';
+    tbody.innerHTML = '<tr><td colspan="6" style="text-align:center; color:#666;">Lade...</td></tr>';
     try {
-        const vos = await apiRequest('/api/vos');
+        // Load anbieter to know each one's default_vo_id.
+        const [vos, anbieter] = await Promise.all([
+            apiRequest('/api/vos'),
+            apiRequest('/api/anbieter'),
+        ]);
+        const defaultByAnbieter = {};
+        anbieter.forEach(a => { defaultByAnbieter[a.id] = a.default_vo_id; });
+
         tbody.innerHTML = '';
         if (!vos.length) {
-            tbody.innerHTML = '<tr><td colspan="5" style="text-align:center; color:#666;">Keine VOs vorhanden</td></tr>';
+            tbody.innerHTML = '<tr><td colspan="6" style="text-align:center; color:#666;">Keine VOs vorhanden</td></tr>';
             return;
         }
         vos.forEach(v => {
+            const isDefault = defaultByAnbieter[v.anbieter_id] === v.id;
             const tr = document.createElement('tr');
             tr.innerHTML = `
                 <td>${escapeHtml(v.anbieter_name)}</td>
                 <td>${escapeHtml(v.nummer)}</td>
                 <td>${escapeHtml(v.bezeichnung || '')}</td>
                 <td>${v.aktiv ? '<span style="color:#27ae60;">Ja</span>' : '<span style="color:#c0392b;">Nein</span>'}</td>
+                <td>${isDefault ? '<span title="Standard-VO" style="color:#f39c12; font-size:18px;">★</span>' : ''}</td>
                 <td>
+                    ${isDefault
+                        ? `<button data-vo-action="unset-default" data-anbieter-id="${v.anbieter_id}" style="margin-right:5px;">Standard entfernen</button>`
+                        : `<button data-vo-action="set-default" data-anbieter-id="${v.anbieter_id}" data-id="${v.id}" style="margin-right:5px;">Als Standard</button>`}
                     <button data-vo-action="edit" data-id="${v.id}"
                             data-anbieter-name="${escapeHtml(v.anbieter_name)}"
                             data-nummer="${escapeHtml(v.nummer)}"
@@ -4094,21 +4116,36 @@ async function loadVosAdmin() {
             tr.querySelectorAll('button[data-vo-action]').forEach(btn => {
                 btn.addEventListener('click', () => {
                     const action = btn.dataset.voAction;
-                    const id = parseInt(btn.dataset.id, 10);
                     if (action === 'edit') {
-                        editVo(id, btn.dataset.nummer, btn.dataset.bezeichnung, btn.dataset.aktiv === '1', btn.dataset.anbieterName);
+                        editVo(parseInt(btn.dataset.id, 10), btn.dataset.nummer, btn.dataset.bezeichnung, btn.dataset.aktiv === '1', btn.dataset.anbieterName);
                     } else if (action === 'delete') {
-                        deleteVo(id, btn.dataset.label);
+                        deleteVo(parseInt(btn.dataset.id, 10), btn.dataset.label);
+                    } else if (action === 'set-default') {
+                        setAnbieterDefaultVo(parseInt(btn.dataset.anbieterId, 10), parseInt(btn.dataset.id, 10));
+                    } else if (action === 'unset-default') {
+                        setAnbieterDefaultVo(parseInt(btn.dataset.anbieterId, 10), null);
                     }
                 });
             });
             tbody.appendChild(tr);
         });
     } catch (e) {
-        tbody.innerHTML = '<tr><td colspan="5" style="text-align:center; color:#c0392b;">Fehler beim Laden</td></tr>';
+        tbody.innerHTML = '<tr><td colspan="6" style="text-align:center; color:#c0392b;">Fehler beim Laden</td></tr>';
     }
 }
 
+async function setAnbieterDefaultVo(anbieterId, voId) {
+    try {
+        await apiRequest(`/api/anbieter/${anbieterId}/default-vo`, {
+            method: 'PUT',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ vo_id: voId }),
+        });
+        showMessage(voId ? 'Standard-VO gesetzt' : 'Standard-VO entfernt');
+        loadVosAdmin();
+    } catch (e) { /* error already shown */ }
+}
+
 async function addVo() {
     const anbieter_id = document.getElementById('voAnbieter').value;
     const nummer = document.getElementById('voNummer').value.trim();

routes/anbieter.js

@@ -5,10 +5,32 @@ const asyncHandler = require('../middleware/asyncHandler');
 const router = express.Router();
 
 router.get('/', asyncHandler(async (req, res) => {
-    const rows = await db.all('SELECT * FROM anbieter ORDER BY name');
+    const rows = await db.all(
+        `SELECT a.*, v.nummer AS default_vo_nummer, v.bezeichnung AS default_vo_bezeichnung
+         FROM anbieter a
+         LEFT JOIN vos v ON a.default_vo_id = v.id
+         ORDER BY a.name`
+    );
     res.json(rows);
 }));
 
+// Set or clear the default VO for a provider. Pass vo_id=null to clear.
+router.put('/:id/default-vo', asyncHandler(async (req, res) => {
+    const { id } = req.params;
+    const { vo_id } = req.body || {};
+    const anbieter = await db.get('SELECT id FROM anbieter WHERE id = ?', [id]);
+    if (!anbieter) return res.status(404).json({ error: 'Anbieter nicht gefunden' });
+    if (vo_id) {
+        const vo = await db.get('SELECT anbieter_id FROM vos WHERE id = ?', [vo_id]);
+        if (!vo) return res.status(400).json({ error: 'VO nicht gefunden' });
+        if (vo.anbieter_id !== Number(id)) {
+            return res.status(400).json({ error: 'VO gehört nicht zu diesem Anbieter' });
+        }
+    }
+    await db.run('UPDATE anbieter SET default_vo_id = ? WHERE id = ?', [vo_id || null, id]);
+    res.json({ message: 'Standard-VO aktualisiert', default_vo_id: vo_id || null });
+}));
+
 router.post('/', asyncHandler(async (req, res) => {
     const { name } = req.body || {};
     if (!name || !name.trim()) {

routes/vos.js

@@ -84,6 +84,8 @@ router.delete('/:id', asyncHandler(async (req, res) => {
         if (used.n_schaltungen > 0) parts.push(`${used.n_schaltungen} Schaltung(en)`);
         return res.status(400).json({ error: `VO kann nicht gelöscht werden: ${parts.join(', ')} verwenden diese VO` });
     }
+    // Clear any anbieter pointing at this VO as their default before removing it.
+    await db.run('UPDATE anbieter SET default_vo_id = NULL WHERE default_vo_id = ?', [id]);
     const result = await db.run('DELETE FROM vos WHERE id = ?', [id]);
     if (result.changes === 0) return res.status(404).json({ error: 'VO nicht gefunden' });
     res.json({ message: 'VO erfolgreich gelöscht' });