tasks now update streaks in db

supabase/migrations/20260524160000_deduplicate_habits.sql

@@ -0,0 +1,13 @@
+-- Remove duplicate active habits with the same name for a user.
+delete from public.habits duplicate
+using public.habits keeper
+where duplicate.user_id = keeper.user_id
+  and duplicate.name = keeper.name
+  and duplicate.active = true
+  and keeper.active = true
+  and duplicate.id <> keeper.id
+  and duplicate.created_at > keeper.created_at;
+
+create unique index if not exists habits_user_id_name_active_unique
+  on public.habits (user_id, name)
+  where active = true;