diff --git a/backend/app/services/analytics_queries.py b/backend/app/services/analytics_queries.py
index 6824b8a0..0c9ada10 100644
--- a/backend/app/services/analytics_queries.py
+++ b/backend/app/services/analytics_queries.py
@@ -1219,7 +1219,7 @@ def recommend_mix(
                         AND a.type = 'apartments'
                  WHERE o.region_cd = :rc
                    AND o.addr ILIKE '%' || :dn || '%'
-                   AND (:cls::text IS NULL OR o.obj_class = :cls)
+                   AND (CAST(:cls AS TEXT) IS NULL OR o.obj_class = :cls)
                  ORDER BY o.flat_count DESC NULLS LAST
                  LIMIT 5
                 """
diff --git a/backend/uv.lock b/backend/uv.lock
index c777f271..c97f6914 100644
--- a/backend/uv.lock
+++ b/backend/uv.lock
@@ -497,6 +497,7 @@ dependencies = [
     { name = "numpy" },
     { name = "openpyxl" },
     { name = "pandas" },
+    { name = "pillow" },
     { name = "playwright" },
     { name = "psycopg", extra = ["binary"] },
     { name = "pydantic" },
@@ -534,6 +535,7 @@ requires-dist = [
     { name = "numpy", specifier = ">=2.0.0" },
     { name = "openpyxl", specifier = ">=3.1.0" },
     { name = "pandas", specifier = ">=2.2.0" },
+    { name = "pillow", specifier = ">=10.4.0" },
     { name = "playwright", specifier = ">=1.45.0" },
     { name = "psycopg", extras = ["binary"], specifier = ">=3.2.0" },
     { name = "pydantic", specifier = ">=2.7.0" },