Fix Volume Breakdown query expansion discrepancy in SearchService

webapp/tipitaka-api/app/services/search_service.py

@@ -343,11 +343,11 @@ class SearchService:
                 
         return list(dict.fromkeys(v for v in variants if v.strip()))
 
-    def _get_fts_results(self, query_text: str, limit: int = 50) -> List[dict]:
-        """Run SQLite FTS5 search on query_text with prefix matching and prefix/suffix expansion."""
+    def _build_fts_query(self, query_text: str) -> str:
+        """Build expanded FTS5 query string from query_text using search rules config."""
         thai_q = to_thai_digits(query_text).strip()
         if not thai_q:
-            return []
+            return ""
 
         # Split into tokens by whitespace
         tokens = [t.strip() for t in thai_q.split() if t.strip()]
@@ -403,7 +403,13 @@ class SearchService:
             for t in tokens:
                 processed_tokens.append(f'"{t}"*')
 
-        fts_query = " AND ".join(processed_tokens)
+        return " AND ".join(processed_tokens)
+
+    def _get_fts_results(self, query_text: str, limit: int = 50) -> List[dict]:
+        """Run SQLite FTS5 search on query_text with prefix matching and prefix/suffix expansion."""
+        fts_query = self._build_fts_query(query_text)
+        if not fts_query:
+            return []
 
         try:
             with self.db.get_connection() as conn:
@@ -623,9 +629,8 @@ class SearchService:
         breakdown_data = {}
         total_count = 0
         try:
-            tokens = [t.strip() for t in thai_q.split() if t.strip()]
-            if tokens:
-                fts_q = " AND ".join(f'"{t}"*' for t in tokens)
+            fts_q = self._build_fts_query(corrected_q)
+            if fts_q:
                 with self.db.get_connection() as conn:
                     cursor = conn.cursor()
                     cursor.execute("""