Add AI search query expansion

app/settings_store.py

@@ -25,6 +25,7 @@ class LLMConfig:
     model: str = ""
     api_key: str = ""
     ai_search_enabled: bool = False
+    ai_search_extra_hints: str = ""
 
 
 def _get_value(rows: dict[str, str], key: str, default: str) -> str:
@@ -48,6 +49,7 @@ def get_app_settings(db: Session) -> LLMConfig:
         model=_get_value(rows, "llm_model", ""),
         api_key=_get_value(rows, "llm_api_key", ""),
         ai_search_enabled=_get_bool(rows, "ai_search_enabled", False),
+        ai_search_extra_hints=_get_value(rows, "ai_search_extra_hints", ""),
     )
 
 
@@ -59,6 +61,7 @@ def save_app_settings(
     model: str | None = None,
     api_key: str | None = None,
     ai_search_enabled: bool | None = None,
+    ai_search_extra_hints: str | None = None,
 ) -> None:
     """Write settings to ``app_settings``.
 
@@ -77,6 +80,8 @@ def save_app_settings(
         updates["llm_api_key"] = api_key
     if ai_search_enabled is not None:
         updates["ai_search_enabled"] = str(ai_search_enabled).lower()
+    if ai_search_extra_hints is not None:
+        updates["ai_search_extra_hints"] = ai_search_extra_hints
 
     for key, value in updates.items():
         existing = db.get(AppSetting, key)