add user banners :)

migrations/add_user_banner.sql

@@ -0,0 +1,7 @@
+-- Add banner_file column to user_options for custom profile banners
+-- Banners are displayed in the alternative infobox (user-infobox-block)
+
+ALTER TABLE user_options
+    ADD COLUMN IF NOT EXISTS banner_file character varying(255) DEFAULT NULL;
+
+COMMENT ON COLUMN public.user_options.banner_file IS 'Custom uploaded banner image filename, stored in public/a/ (same dir as avatars)';