feat(#64): Improve the about page

supabase/migrations/20260110120002_create_get_stats_function.sql

@@ -0,0 +1,36 @@
+-- Create function to get public stats with caching
+-- Returns cached stats if fresh (within 24 hours), otherwise refreshes cache
+
+CREATE OR REPLACE FUNCTION get_public_stats()
+RETURNS TABLE (
+  pokemon_caught BIGINT,
+  total_users BIGINT,
+  completed_pokedexes BIGINT,
+  updated_at TIMESTAMPTZ
+)
+SECURITY DEFINER
+LANGUAGE plpgsql
+AS $$
+DECLARE
+  v_cache_exists BOOLEAN;
+BEGIN
+  -- Check if cache exists and is fresh (within 24 hours)
+  SELECT EXISTS(
+    SELECT 1 FROM stats_cache
+    WHERE stats_cache.updated_at > NOW() - INTERVAL '24 hours'
+  ) INTO v_cache_exists;
+
+  IF v_cache_exists THEN
+    -- Return cached stats
+    RETURN QUERY
+    SELECT sc.pokemon_caught, sc.total_users, sc.completed_pokedexes, sc.updated_at
+    FROM stats_cache sc
+    ORDER BY sc.updated_at DESC
+    LIMIT 1;
+  ELSE
+    -- Cache is stale or doesn't exist, update it
+    RETURN QUERY
+    SELECT * FROM update_and_get_stats();
+  END IF;
+END;
+$$;