fix history anchor

config/retriex/agent.yaml

@@ -638,6 +638,39 @@ parameters:
           - kostet
           - shopsuche
           - shop-suche
+      rag_anchor_enrichment:
+        enabled: true
+        # Enriches overly narrow numeric shop queries with a product anchor from
+        # retrieved RAG records when the same record explicitly contains the
+        # requested numeric value/unit. This prevents queries such as "0,02"
+        # when RAG already identified a concrete product such as a device model.
+        min_score: 120
+        max_query_terms: 6
+        early_chunk_bonus_max: 10
+        template: '{anchor} {query} {subject}'
+        scores:
+          exact_value_with_unit: 120
+          exact_value_only: 40
+          anchor_bonus: 50
+        numeric_focus_patterns:
+          - '/(?P<value>\d+(?:[,.]\d+)?)\s*(?P<unit>°?\s*d\s*h|dh|dH)/iu'
+        product_title_patterns:
+          - '/#\s*Produkt\s+Titel:\s*`(?P<title>[^`]+)`/iu'
+          - '/\*\*Produktname:\*\*\s*(?P<title>[^\r\n]+)/iu'
+        anchor_bonus_patterns:
+          - '/\b[\p{L}][\p{L}\p{N}®+._-]*(?:\s+|[-_])\d{2,5}\b/u'
+        subject_terms:
+          - resthärte
+          - resthaerte
+          - wasserhärte
+          - wasserhaerte
+          - gesamthärte
+          - gesamthaerte
+          - härte
+          - haerte
+          - grenzwert
+          - messung
+
       language_preservation:
         enabled: true
         language_markers: