diff --git a/internal/store/store.go b/internal/store/store.go
index 2a917d5..b073f2a 100644
--- a/internal/store/store.go
+++ b/internal/store/store.go
@@ -652,9 +652,9 @@ SELECT
   count(*) FILTER (WHERE item->>'provider' = winner_provider) AS wins,
   count(*) FILTER (WHERE completed_at > NOW() - INTERVAL '24 hours') AS last_24h_attempts,
   count(*) FILTER (WHERE completed_at > NOW() - INTERVAL '24 hours' AND item->>'status' = 'ok') AS last_24h_success,
-  COALESCE(avg(NULLIF(item->>'duration_ms', '')::bigint), 0) AS avg_duration_ms,
+  COALESCE(avg(NULLIF(item->>'duration_ms', '')::bigint)::double precision, 0) AS avg_duration_ms,
   COALESCE(percentile_cont(0.5) WITHIN GROUP (ORDER BY NULLIF(item->>'duration_ms', '')::bigint), 0) AS p50_duration_ms,
-  COALESCE(avg(length(COALESCE(item->>'text', ''))), 0) AS avg_text_chars,
+  COALESCE(avg(length(COALESCE(item->>'text', '')))::double precision, 0) AS avg_text_chars,
   max(completed_at) AS last_at
 FROM attempts
 WHERE COALESCE(item->>'provider', '') <> ''