diff --git a/src/routes/words.js b/src/routes/words.js
index 3326d11..3819988 100644
--- a/src/routes/words.js
+++ b/src/routes/words.js
@@ -71,18 +71,23 @@ function autoTranslatedStatus(row) {
 // POST /api/words
 router.post('/', async (req, res, next) => {
   try {
-    const { titel_de, titel_en, titel_sv, difficulty_level, status } = req.body;
+    const { titel_de, titel_en, titel_sv, difficulty_level, status, conc_m } = req.body;
     if (status && !STATUSES.includes(status))
       return res.status(400).json({ error: `status must be one of: ${STATUSES.join(', ')}` });
     // Auto: alle 3 Sprachen direkt mitgeliefert + kein expliziter Status → 'translated'
     const allLangs = titel_de && titel_en && titel_sv;
     const effectiveStatus = status || (allLangs ? 'translated' : 'requested');
     const result = await query(
-      `INSERT INTO words (titel_de, titel_en, titel_sv, difficulty_level, status, requested_at)
-       VALUES ($1, $2, $3, $4, $5, NOW()) RETURNING *`,
-      [titel_de || null, titel_en || null, titel_sv || null, difficulty_level || null, effectiveStatus]
+      `INSERT INTO words (titel_de, titel_en, titel_sv, difficulty_level, status, conc_m, requested_at)
+       VALUES ($1, $2, $3, $4, $5, $6, NOW())
+       ON CONFLICT (titel_en) DO UPDATE SET conc_m = EXCLUDED.conc_m
+       RETURNING *, (xmax = 0) AS is_insert`,
+      [titel_de || null, titel_en || null, titel_sv || null,
+       difficulty_level || null, effectiveStatus, conc_m ?? null]
     );
-    res.status(201).json({ ...result.rows[0], picture_ids: [], category_ids: [] });
+    const row = result.rows[0];
+    const { is_insert: _, ...word } = row;
+    res.status(row.is_insert ? 201 : 200).json({ ...word, picture_ids: [], category_ids: [] });
   } catch (err) { next(err); }
 });