feat: add PATCH /recorders/:id endpoint to edit recorder settings

Allows updating name, source_type, source_config, recording_codec,
recording_resolution, proxy_enabled, proxy_codec, proxy_resolution,
and project_id. Blocked while the recorder is actively recording.

services/mam-api/src/routes/recorders.js

@@ -187,6 +187,69 @@ router.get('/:id', async (req, res, next) => {
   }
 });
 
+// PATCH /:id - Edit recorder settings
+// Blocked while recorder is actively recording to prevent config drift.
+router.patch('/:id', async (req, res, next) => {
+  try {
+    const { id } = req.params;
+
+    const recorderResult = await pool.query(
+      'SELECT * FROM recorders WHERE id = $1',
+      [id]
+    );
+    if (recorderResult.rows.length === 0) {
+      return res.status(404).json({ error: 'Recorder not found' });
+    }
+
+    const recorder = recorderResult.rows[0];
+    if (recorder.status === 'recording') {
+      return res.status(409).json({ error: 'Cannot edit a recorder while it is recording — stop it first' });
+    }
+
+    const {
+      name,
+      source_type,
+      source_config,
+      recording_codec,
+      recording_resolution,
+      proxy_enabled,
+      proxy_codec,
+      proxy_resolution,
+      project_id,
+    } = req.body;
+
+    const updates = [];
+    const params  = [];
+    let   n       = 1;
+
+    if (name                !== undefined) { updates.push(`name = $${n++}`);                  params.push(name); }
+    if (source_type         !== undefined) { updates.push(`source_type = $${n++}`);           params.push(source_type); }
+    if (source_config       !== undefined) { updates.push(`source_config = $${n++}`);         params.push(source_config); }
+    if (recording_codec     !== undefined) { updates.push(`recording_codec = $${n++}`);       params.push(recording_codec); }
+    if (recording_resolution !== undefined){ updates.push(`recording_resolution = $${n++}`);  params.push(recording_resolution); }
+    if (proxy_enabled       !== undefined) { updates.push(`proxy_enabled = $${n++}`);         params.push(proxy_enabled); }
+    if (proxy_codec         !== undefined) { updates.push(`proxy_codec = $${n++}`);           params.push(proxy_codec); }
+    if (proxy_resolution    !== undefined) { updates.push(`proxy_resolution = $${n++}`);      params.push(proxy_resolution); }
+    if (project_id          !== undefined) { updates.push(`project_id = $${n++}`);            params.push(project_id || null); }
+
+    if (updates.length === 0) {
+      return res.status(400).json({ error: 'No fields to update' });
+    }
+
+    updates.push(`updated_at = NOW()`);
+    params.push(id);
+
+    const result = await pool.query(
+      `UPDATE recorders SET ${updates.join(', ')} WHERE id = $${n} RETURNING *`,
+      params
+    );
+
+    res.json(result.rows[0]);
+  } catch (err) {
+    next(err);
+  }
+});
+
 // POST /:id/start - Start recording
 router.post('/:id/start', async (req, res, next) => {
   try {