categorisation for gifs

deploy/migrations/20260824000000_gif_catalog_category.down.sql

@@ -0,0 +1,2 @@
+DROP INDEX IF EXISTS public.gif_catalog_category_idx;
+ALTER TABLE public.gif_catalog DROP COLUMN IF EXISTS category;

deploy/migrations/20260824000000_gif_catalog_category.up.sql

@@ -0,0 +1,9 @@
+-- Tags a gif_catalog entry with one of the messages.getEmojiGroups category
+-- titles (see internal/seed/catalog/emoji_groups.json) so tapping a category
+-- icon in the client's GIF picker can filter to that emotion instead of
+-- always showing the whole catalog (see files.ClassifyGifCategory). Empty
+-- means uncategorized -- still served by plain text search, just not by any
+-- category tap.
+ALTER TABLE public.gif_catalog ADD COLUMN category text DEFAULT ''::text NOT NULL;
+
+CREATE INDEX gif_catalog_category_idx ON public.gif_catalog (category) WHERE category <> '';