feat: идемпотентность DTC + prompt учитывает неточности данных

api/routes.py

@@ -274,6 +274,14 @@ def register(app):
         client_info = data.get("client_info", {})
         client_info["client_ip"] = request.remote_addr
         
+        # Идемпотентность
+        request_id = (data.get("request_id") or "").strip()
+        if request_id:
+            with Database() as db:
+                cached = db.get_cached_response(request_id)
+                if cached is not None:
+                    return jsonify(cached), 200
+
         try:
             with Database() as db:
                 db.save_dtc_scan(client_info, codes)
@@ -282,7 +290,22 @@ def register(app):
         
         dtc = _load_dtc_dict()
         decoded = [{"code": c, "desc": dtc.get(c.strip().upper(), c)} for c in codes]
-        return jsonify({"codes": decoded, "count": len(decoded)})
+        response = {"codes": decoded, "count": len(decoded)}
+        
+        # Сохраняем кэш для идемпотентности
+        if request_id:
+            try:
+                with Database() as db:
+                    db.save_session(
+                        client_info=client_info,
+                        responses=[{"decoded": f"DTC stored: {c}"} for c in codes],
+                        request_id=request_id,
+                        response_json=response,
+                    )
+            except Exception as e:
+                logger.error(f"DTC idempotency cache failed: {e}")
+        
+        return jsonify(response)
 
 
 def _summary(p: dict) -> dict: