add comments

src/Config/AgentRunnerConfig.php

@@ -6,24 +6,27 @@ class AgentRunnerConfig
 {
     public function getShopPrompt($prompt): string
     {
+        /**
+         * Erzeuge aus dem folgenden Nutzereingabetext einen kurzen Suchtext für die Shopware-6-Suche. Regeln: - Gib nur den finalen Suchtext aus. - erstelle immer die singular form von den relevanten Suchbegriffen - Keine Einleitung, keine Erklärung, keine Anführungszeichen. - Verwende nur die shop relevanten Suchbegriffe für eine Shopsuche aus dem Nutzereingabetext. - Maximal 6 Suchbegriffe, besser weniger. - Entferne Füllwörter, Höflichkeitsformen und irrelevante Wörter. - Erhalte Produktnamen, Marken, Modellnummern und zusammengesetzte Begriffe exakt, wenn sie relevant sind. - Zahlen, die zu einem Produktnamen oder Modell gehören (zb Indikator 300 oder Testomat 808 oder Testomat 2000), müssen erhalten bleiben. - Trenne die Begriffe nur durch Leerzeichen. Ausgabeformat: Keyword1 Keyword2 Keyword3
+         */
         return '
-                Erzeuge aus dem folgenden Nutzereingabetext einen kurzen Suchtext für die Shopware-6-Suche.
+            Generate a short search query for Shopware 6 from the following user input text.
+            
+            Rules:
+            - Output only the final search query.
+            - Always convert relevant search terms to their singular form.
+            - No introduction, no explanation, no quotation marks.
+            - Use only shop-relevant search terms from the user input for a shop search.
+            - Maximum 6 search terms, preferably fewer.
+            - Remove filler words, polite phrases, and irrelevant words.
+            - Preserve product names, brands, model numbers, and compound terms exactly if they are relevant.
+            - Numbers that belong to a product name or model must be preserved (e.g. Indikator 300, Testomat 808, Testomat 2000).
+            - Separate terms using spaces only.
+            
+            Output format:
+            Keyword1 Keyword2 Keyword3
                 
-                Regeln:
+            input text: ' . $prompt . '
-                - Gib nur den finalen Suchtext aus.
+            ';
-                - erstelle immer die singular form von den relevanten Suchbegriffen
-                - Keine Einleitung, keine Erklärung, keine Anführungszeichen.
-                - Verwende nur die shop relevanten Suchbegriffe für eine Shopsuche aus dem Nutzereingabetext.
-                - Maximal 6 Suchbegriffe, besser weniger.
-                - Entferne Füllwörter, Höflichkeitsformen und irrelevante Wörter.
-                - Erhalte Produktnamen, Marken, Modellnummern und zusammengesetzte Begriffe exakt, wenn sie relevant sind.
-                - Zahlen, die zu einem Produktnamen oder Modell gehören (zb Indikator 300 oder Testomat 808), müssen erhalten bleiben.
-                - Trenne die Begriffe nur durch Leerzeichen.
-                
-                Ausgabeformat:
-                Keyword1 Keyword2 Keyword3
-                
-                Nutzereingabetext: ' . $prompt . '
-                ';
     }
 }

src/Config/QueryEnricherConfig.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Config;
+
+class QueryEnricherConfig
+{
+    public function getEnrichQueryList(): array
+    {
+        return [
+            'Wasserhärte' => 'Resthärte',
+            'Gerät' => 'Modell',
+            'Indikator' => 'Chemie',
+            'Seminar' => 'Webinar',
+            'Schulung' => 'Seminar',
+            'Indikatoren' => 'Indikator',
+            'Wasserhärte-Grenzwert' => 'Resthärte',
+            'Resthärte-Grenzwert' => 'Wasserhärte',
+        ];
+    }
+}

src/Controller/HistoryController.php

@@ -24,11 +24,11 @@ use Symfony\Component\Routing\Annotation\Route;
  * - Client identity is resolved exclusively via ClientIdResolver
  * - No user identifiers are accepted from the request
  */
-final class HistoryController
+final readonly class HistoryController
 {
     public function __construct(
-        private readonly ContextService $contextService,
+        private ContextService   $contextService,
-        private readonly ClientIdResolver $clientIdResolver,
+        private ClientIdResolver $clientIdResolver,
     ) {}
 
     /**

src/Knowledge/Retrieval/NdjsonChunkLookup.php

@@ -6,12 +6,11 @@ declare(strict_types=1);
 namespace App\Knowledge\Retrieval;
 
 use App\Knowledge\ChunkManager;
-use Symfony\Component\Uid\Uuid;
 
-final class NdjsonChunkLookup
+final readonly class NdjsonChunkLookup
 {
     public function __construct(
-        private readonly ChunkManager $chunkManager
+        private ChunkManager $chunkManager
     )
     {
     }
@@ -33,7 +32,6 @@ final class NdjsonChunkLookup
 
             $found[$id] = $row;
 
-            // Early exit sobald alle gefunden
             if (\count($found) === \count($wanted)) {
                 break;
             }

src/Knowledge/Retrieval/NdjsonHybridRetriever.php

@@ -14,7 +14,20 @@ use App\Repository\ModelGenerationConfigRepository;
 use App\Routing\IntentRouteResolver;
 use App\Tag\TagRoutingService;
 use App\Vector\VectorSearchClient;
+use Doctrine\DBAL\Exception;
+use RuntimeException;
 
+/**
+ * Hybrid retriever for NDJSON-based knowledge chunks.
+ *
+ * Main responsibilities:
+ * - detect high-level request intent
+ * - optionally short-circuit to catalog list output
+ * - run vector retrieval globally and optionally document-scoped
+ * - fuse both result sets with RRF-style scoring
+ * - apply selection rules for list queries vs. sales-style queries
+ * - return either plain chunk texts or debug metadata
+ */
 final readonly class NdjsonHybridRetriever implements RetrieverInterface
 {
     public function __construct(
@@ -37,15 +50,27 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
     // PUBLIC API
     // =========================================================
 
+    /**
+     * Returns the final retrieval payload as plain text chunks.
+     *
+     * Behaviour:
+     * - loads active retrieval config
+     * - executes the full orchestration pipeline
+     * - if the route resolves to a catalog list, returns the catalog block only
+     * - otherwise returns the selected chunk texts
+     * @throws Exception
+     */
     public function retrieve(string $prompt): array
     {
         $config = $this->requireConfig();
         $result = $this->execute($prompt, $config, false);
 
+        // Catalog list responses bypass normal chunk retrieval completely.
         if ($result['catalogBlock'] !== null) {
             return [$result['catalogBlock']];
         }
 
+        // No selected chunks means no usable retrieval result.
         if ($result['selectedChunkIds'] === []) {
             return [];
         }
@@ -56,11 +81,23 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
         );
     }
 
+    /**
+     * Returns a debug-friendly retrieval result with scoring/meta information.
+     *
+     * This method is used for inspection and tuning:
+     * - selected chunk ids
+     * - raw vector scores
+     * - fused RRF scores
+     * - intent / route information
+     * - threshold and list-query flags
+     * @throws Exception
+     */
     public function retrieveDebug(string $prompt, ?ModelGenerationConfig $config = null): array
     {
         $config = $config ?? $this->requireConfig();
         $result = $this->execute($prompt, $config, true);
 
+        // For catalog list routes we expose a synthetic debug row.
         if ($result['catalogBlock'] !== null) {
             return [[
                 'rank' => 1,
@@ -86,6 +123,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
 
         foreach ($result['selectedChunkIds'] as $chunkId) {
 
+            // Skip ids that could not be resolved to real chunk rows.
             if (!isset($result['rows'][$chunkId])) {
                 continue;
             }
@@ -114,6 +152,17 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
     // CENTRAL ORCHESTRATION
     // =========================================================
 
+    /**
+     * Central orchestration entrypoint.
+     *
+     * Pipeline:
+     * 1. Detect catalog entity and sales intent
+     * 2. Resolve route
+     * 3. If route is a catalog list route, try direct catalog output
+     * 4. Otherwise, run the normal hybrid retrieval core
+     * 5. Select final chunk ids depending on query type
+     * @throws Exception
+     */
     private function execute(
         string                $prompt,
         ModelGenerationConfig $config,
@@ -125,6 +174,9 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
         $salesIntent = $this->detectSalesIntent($prompt);
         $route = $this->routeResolver->resolve($salesIntent, $entityLabel);
 
+        // Fast path:
+        // If the route explicitly asks for a catalog list and we have an entity label,
+        // we return a prebuilt catalog block instead of semantic chunk retrieval.
         if ($route === IntentRouteResolver::ROUTE_CATALOG_LIST && $entityLabel !== null) {
 
             $catalogBlock = $this->entityCatalogService->listByTerm($entityLabel);
@@ -147,6 +199,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
 
         $core = $this->runCore($prompt, $config, $withScores, $salesIntent);
 
+        // No ranked chunks or no resolved rows means retrieval produced nothing usable.
         if ($core['ranked_chunk_ids'] === [] || $core['rows'] === []) {
             return [
                 'route' => $route,
@@ -162,6 +215,9 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
             ];
         }
 
+        // Selection strategy depends on query type:
+        // - list queries prefer deduplicated chunks
+        // - sales queries prefer spread across docs / chunk distance
         $selectedChunkIds = $core['is_list_query']
             ? $this->selectListChunkIds($core['ranked_chunk_ids'], $core['rows'], $core['limit'])
             : $this->selectSalesChunkIds($core['ranked_chunk_ids'], $core['rows'], $core['limit']);
@@ -184,6 +240,20 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
     // CORE PIPELINE
     // =========================================================
 
+    /**
+     * Executes the actual hybrid retrieval logic.
+     *
+     * Steps:
+     * - derive limits from config within hard safety caps
+     * - detect whether the prompt is a "list query"
+     * - clean and enrich the prompt
+     * - compute threshold + vector topK based on intent/query type
+     * - route query into candidate document ids via tag routing
+     * - run global and optional scoped vector search
+     * - fuse hits
+     * - resolve chunk ids to chunk rows
+     * @throws Exception
+     */
     private function runCore(
         string                $prompt,
         ModelGenerationConfig $config,
@@ -197,9 +267,11 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
 
         $isListQuery = $this->intentLite->isListQuery($prompt);
 
+        // The prompt is normalized first, then enriched before retrieval.
         $cleanQuery = $this->queryCleaner->clean($prompt);
         $cleanQuery = $this->queryEnricher->enrichPrompt($cleanQuery);
 
+        // Empty cleaned query means retrieval would be meaningless.
         if ($cleanQuery === '') {
             return [
                 'limit' => $limit,
@@ -218,18 +290,22 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
             $vectorTopKBase
         );
 
+        // Tag routing tries to narrow retrieval to relevant document ids.
         $candidateDocIds = $this->tagRouting->route($cleanQuery);
         $candidateDocIds = is_array($candidateDocIds)
             ? array_values(array_unique(array_filter($candidateDocIds, 'is_string')))
             : [];
 
+        // Always run a global search.
         $globalHits = $this->vectorClient->search($cleanQuery, $topK);
 
+        // Optionally run a scoped search if tag routing yielded document candidates.
         $scopedHits = [];
         if ($candidateDocIds !== []) {
             $scopedHits = $this->vectorClient->searchScoped($cleanQuery, $topK, $candidateDocIds);
         }
 
+        // Nothing found at all.
         if ($globalHits === [] && $scopedHits === []) {
             return [
                 'limit' => $limit,
@@ -242,6 +318,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
             ];
         }
 
+        // Fuse global and scoped hits with optional scoped boost.
         $fused = $this->fuseHits(
             $globalHits,
             $scopedHits,
@@ -253,10 +330,12 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
         $rrfScores = $fused['rrf_scores'];
         $rawScores = $fused['raw_scores'];
 
+        // Fallback:
+        // If all hits were filtered by threshold but global hits exist,
+        // derive a weak RRF ranking from the raw hit order.
         if ($rrfScores === [] && $globalHits !== []) {
             $rrfScores = $this->fallbackRrfFromHits(
-                $globalHits,
+                $globalHits
-                NdjsonHybridRetrieverConfig::EMPTY_RRF_FALLBACK_TOPN
             );
         }
 
@@ -272,8 +351,11 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
             ];
         }
 
+        // Highest fused score first.
         arsort($rrfScores);
         $rankedChunkIds = array_keys($rrfScores);
+
+        // Resolve the ranking to actual NDJSON chunk rows.
         $rows = $this->lookup->findByChunkIds($rankedChunkIds);
 
         return [
@@ -291,21 +373,39 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
     // SUPPORT
     // =========================================================
 
+    /**
+     * Loads the active model generation config.
+     *
+     * Retrieval is not allowed to proceed without an active config.
+     */
     private function requireConfig(): ModelGenerationConfig
     {
         $config = $this->configRepository->findActiveForModel();
         if ($config === null) {
-            throw new \RuntimeException('No active ModelGenerationConfig found.');
+            throw new RuntimeException('No active ModelGenerationConfig found.');
         }
         return $config;
     }
 
+    /**
+     * Extracts the normalized sales intent string from the intent detector.
+     *
+     * Falls back to DISCOVERY when the detector payload is incomplete.
+     */
     private function detectSalesIntent(string $prompt): string
     {
         $data = $this->salesIntentLite->detect($prompt);
         return (string)($data['intent'] ?? SalesIntentLite::DISCOVERY);
     }
 
+    /**
+     * Computes retrieval threshold and vector topK.
+     *
+     * Rules:
+     * - objection/pricing intents are slightly stricter
+     * - list queries are allowed to retrieve a wider candidate set
+     * - all values are clamped to global hard limits
+     */
     private function computeThresholdAndTopK(
         string $salesIntent,
         bool   $isListQuery,
@@ -333,6 +433,15 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
         return [$threshold, $topK];
     }
 
+    /**
+     * Fuses multiple hit lists into one RRF-style score map.
+     *
+     * Notes:
+     * - only hits above threshold are considered
+     * - rank position within each hit list contributes to the final score
+     * - scoped hits can be boosted
+     * - raw scores are optionally captured for debug output
+     */
     private function fuseHits(
         array $globalHits,
         array $scopedHits,
@@ -351,18 +460,21 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
 
             foreach ($hits as $hit) {
 
+                // Every hit must provide a chunk id and a numeric score.
                 if (!isset($hit['chunk_id'], $hit['score'])) {
                     continue;
                 }
 
                 $raw = (float)$hit['score'];
 
+                // Threshold is applied before rank fusion.
                 if ($raw < $threshold) {
                     continue;
                 }
 
                 $chunkId = (string)$hit['chunk_id'];
 
+                // Store the best raw score per chunk for debug inspection.
                 if ($captureRaw) {
                     $rawScores[$chunkId] = max($rawScores[$chunkId] ?? 0.0, $raw);
                 }
@@ -370,10 +482,12 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
                 $rank++;
                 $rrf = 1.0 / (NdjsonHybridRetrieverConfig::RRF_K + $rank);
 
+                // Scoped result lists can get a slight relevance bonus.
                 if ($boost) {
                     $rrf *= 1.2;
                 }
 
+                // Scores from multiple hit lists accumulate.
                 $rrfScores[$chunkId] = ($rrfScores[$chunkId] ?? 0.0) + $rrf;
             }
         };
@@ -387,7 +501,13 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
         ];
     }
 
-    private function fallbackRrfFromHits(array $hits, int $topN): array
+    /**
+     * Builds a fallback RRF ranking purely from hit order.
+     *
+     * Used when thresholding removed all fused candidates but
+     * the global hit list itself still exists.
+     */
+    private function fallbackRrfFromHits(array $hits): array
     {
         $rrf = [];
         $rank = 0;
@@ -401,7 +521,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
             $rank++;
             $rrf[(string)$hit['chunk_id']] = 1.0 / (NdjsonHybridRetrieverConfig::RRF_K + $rank);
 
-            if ($rank >= $topN) {
+            if ($rank >= NdjsonHybridRetrieverConfig::EMPTY_RRF_FALLBACK_TOPN) {
                 break;
             }
         }
@@ -409,6 +529,14 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
         return $rrf;
     }
 
+    /**
+     * Selection strategy for list-style queries.
+     *
+     * Goal:
+     * - avoid near-identical chunks
+     * - prefer diverse list entries
+     * - stop once the configured limit is reached
+     */
     private function selectListChunkIds(array $chunkIds, array $rows, int $limit): array
     {
         $seen = [];
@@ -425,6 +553,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
                 continue;
             }
 
+            // Deduplicate by normalized chunk text.
             $key = md5(mb_strtolower((string)preg_replace('/\s+/u', ' ', $chunk)));
 
             if (isset($seen[$key])) {
@@ -442,6 +571,14 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
         return $out;
     }
 
+    /**
+     * Selection strategy for sales-oriented queries.
+     *
+     * Goal:
+     * - avoid overloading the result with chunks from the same document
+     * - avoid chunks that are too close to each other in the same document
+     * - preserve top-ranked relevance while improving contextual spread
+     */
     private function selectSalesChunkIds(array $chunkIds, array $rows, int $limit): array
     {
         $out = [];
@@ -457,14 +594,17 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
             $docId = $rows[$chunkId]['document_id'] ?? null;
             $chunkIndex = $rows[$chunkId]['chunk_index'] ?? null;
 
+            // Sales selection requires a valid document context.
             if (!is_string($docId)) {
                 continue;
             }
 
+            // Limit how many chunks may come from the same document.
             if (($docCounter[$docId] ?? 0) >= NdjsonHybridRetrieverConfig::MAX_CHUNKS_PER_DOC) {
                 continue;
             }
 
+            // Enforce a minimum distance between chunk positions of the same document.
             if (is_int($chunkIndex)) {
                 foreach ($docChunkPositions[$docId] ?? [] as $prevIdx) {
                     if (abs($prevIdx - $chunkIndex) < NdjsonHybridRetrieverConfig::MIN_CHUNK_DISTANCE) {
@@ -490,6 +630,9 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
         return $out;
     }
 
+    /**
+     * Converts selected chunk ids into the final plain text result list.
+     */
     private function collectTextsFromIds(array $chunkIds, array $rows): array
     {
         $out = [];

src/Knowledge/Retrieval/QueryCleaner.php

@@ -9,14 +9,14 @@ use App\Knowledge\StopWords;
 final class QueryCleaner
 {
     /**
-     * Bereinigt eine Query ausschließlich für Retrieval-Zwecke.
+     * Cleans a query strictly for retrieval purposes.
      *
-     * Wichtig:
+     * Important:
-     * - Unicode-sicher
+     * - Unicode-safe
-     * - Zahlen bleiben erhalten
+     * - Numbers are preserved
-     * - Negationen bleiben erhalten
+     * - Negations are preserved
-     * - Keine aggressive Token-Längen-Filterung
+     * - No aggressive token-length filtering
-     * - StopWords werden entfernt
+     * - Stop words are removed
      */
     public function clean(string $query): string
     {
@@ -24,23 +24,23 @@ final class QueryCleaner
             return '';
         }
 
-        // 1. Unicode-sicher lowercase
+        // 1. Convert to lowercase in a Unicode-safe way
         $query = mb_strtolower($query, 'UTF-8');
 
-        // 2. Bindestriche & Slashes als Worttrenner behandeln
+        // 2. Treat hyphens and slashes as word separators
         $query = str_replace(['-', '/'], ' ', $query);
 
-        // 3. Sonderzeichen entfernen, aber:
+        // 3. Remove special characters, but keep:
-        //    - Buchstaben behalten
+        //    - letters
-        //    - Zahlen behalten
+        //    - numbers
-        //    - Umlaute behalten
+        //    - other Unicode letters
         $query = preg_replace('/[^\p{L}\p{N}\s]/u', ' ', $query);
 
         if ($query === null) {
             return '';
         }
 
-        // 4. Mehrfache Whitespaces normalisieren
+        // 4. Normalize multiple whitespace characters
         $query = preg_replace('/\s+/u', ' ', $query);
         $query = trim($query);
 
@@ -48,7 +48,7 @@ final class QueryCleaner
             return '';
         }
 
-        // 5. Tokenisierung
+        // 5. Tokenize the query
         $tokens = preg_split('/\s+/u', $query);
 
         if ($tokens === false) {
@@ -65,7 +65,7 @@ final class QueryCleaner
                 continue;
             }
 
-            // StopWords entfernen
+            // Remove stop words
             if (StopWords::isStopWord($token)) {
                 continue;
             }

src/Knowledge/Retrieval/QueryEnricher.php

@@ -4,11 +4,25 @@ declare(strict_types=1);
 
 namespace App\Knowledge\Retrieval;
 
-final class QueryEnricher
+use App\Config\QueryEnricherConfig;
+
+final readonly class QueryEnricher
 {
+    public function __construct(
+        private QueryEnricherConfig $config
+    )
+    {
+    }
+
+    /**
+     * Enriches the query with mapped counterpart terms.
+     *
+     * Example:
+     * - input:  "water hardness device"
+     * - output: "water hardness device | Synonyms: residual hardness, model"
+     */
     public function enrichPrompt(string $query): string
     {
-        // Return early if the input is empty or contains only whitespace.
         if (trim($query) === '') {
             return '';
         }
@@ -19,19 +33,19 @@ final class QueryEnricher
         // Normalize the query for case-insensitive matching.
         $normalizedQuery = $this->normalize($query);
 
-        // Expect an associative array like:
+        // Expected format:
         // [
-        //     'hose'  => 'jeans',
+        //     'trousers' => 'jeans',
-        //     'jacke' => 'mantel',
+        //     'jacket'   => 'coat',
         // ]
-        $mapping = $this->enrichQueryList();
+        $mapping = $this->config->getEnrichQueryList();
 
         // Build a bidirectional lookup table:
         // key   -> value
         // value -> key
         $lookup = $this->buildBidirectionalLookup($mapping);
 
-        // Split the query into searchable words/tokens.
+        // Split the query into searchable tokens.
         $tokens = $this->tokenize($normalizedQuery);
 
         $matches = [];
@@ -46,17 +60,17 @@ final class QueryEnricher
         // Remove duplicates while preserving order.
         $matches = array_values(array_unique($matches));
 
-        // If nothing was found, return the original query unchanged.
+        // If no matches were found, return the original query unchanged.
         if ($matches === []) {
             return $originalQuery;
         }
 
-        // Append the matched counterpart terms to the original prompt.
+        // Append the matched counterpart terms to the original query.
-        return $originalQuery . " | Pseudonyme: " . implode(', ', $matches);
+        return $originalQuery . ' | Synonyms: ' . implode(', ', $matches);
     }
 
     /**
-     * Normalize a string for case-insensitive comparison.
+     * Normalizes a string for case-insensitive comparison.
      */
     private function normalize(string $value): string
     {
@@ -64,8 +78,9 @@ final class QueryEnricher
     }
 
     /**
-     * Tokenize the query into words.
+     * Tokenizes the query into words.
-     * Splits on everything that is not a letter or number.
+     *
+     * Splits on every character that is not a letter or number.
      */
     private function tokenize(string $value): array
     {
@@ -73,20 +88,20 @@ final class QueryEnricher
     }
 
     /**
-     * Build a lookup table that works in both directions.
+     * Builds a lookup table that works in both directions.
      *
      * Example:
      * [
-     *     'hose'  => 'jeans',
+     *     'trousers' => 'jeans',
-     *     'jacke' => 'mantel',
+     *     'jacket'   => 'coat',
      * ]
      *
      * becomes:
      * [
-     *     'hose'   => 'jeans',
+     *     'trousers' => 'jeans',
-     *     'jeans'  => 'hose',
+     *     'jeans'    => 'trousers',
-     *     'jacke'  => 'mantel',
+     *     'jacket'   => 'coat',
-     *     'mantel' => 'jacke',
+     *     'coat'     => 'jacket',
      * ]
      */
     private function buildBidirectionalLookup(array $mapping): array
@@ -94,8 +109,8 @@ final class QueryEnricher
         $lookup = [];
 
         foreach ($mapping as $key => $value) {
-            $key = trim((string)$key);
+            $key = trim((string) $key);
-            $value = trim((string)$value);
+            $value = trim((string) $value);
 
             // Skip incomplete pairs.
             if ($key === '' || $value === '') {
@@ -114,18 +129,4 @@ final class QueryEnricher
 
         return $lookup;
     }
-
-    public function enrichQueryList(): array
-    {
-        return [
-            'Wasserhärte' => "Resthärte",
-            'Gerät' => 'Modell',
-            'Indikator' => 'Chemie',
-            'Seminar' => 'Webinar',
-            'Schulung' => 'Seminar',
-            'Indikatoren' => 'Indikator',
-            'Wasserhärte-Grenzwert'=>'Resthärte',
-            'Resthärte-Grenzwert'=>'Wasserhärte'
-        ];
-    }
 }