merged from gramsrv upstream

deploy/migrations/20260901000006_sticker_set_system_key_unique.up.sql

@@ -0,0 +1,25 @@
+-- system_key is the constructor-routing identity for global sticker sets. More
+-- than one row makes messages.getStickerSet/inputStickerSet* nondeterministic
+-- and can alternate clients between different catalogs after a restart.
+
+-- StatusPack is now imported from the official export. Preserve the historical
+-- synthesized set as an addressable short-name catalog, but only remove its
+-- routing key when another real default-status set already owns that key.
+UPDATE public.sticker_sets AS synthesized
+SET system_key = '', updated_at = now()
+WHERE synthesized.id = 7777000000000001
+  AND synthesized.system_key = 'emoji_default_statuses'
+  AND EXISTS (
+      SELECT 1
+      FROM public.sticker_sets AS real_set
+      WHERE real_set.system_key = synthesized.system_key
+        AND real_set.id <> synthesized.id
+  );
+
+DROP INDEX IF EXISTS public.sticker_sets_system_key_idx;
+
+-- Fail closed on any other duplicate instead of making the read path choose an
+-- arbitrary row. Empty keys are ordinary/non-system sets and are not unique.
+CREATE UNIQUE INDEX sticker_sets_system_key_idx
+  ON public.sticker_sets USING btree (system_key)
+  WHERE system_key <> ''::text;