diff --git a/app/services/hash_twins.ts b/app/services/hash_twins.ts
index 0254703..701d023 100644
--- a/app/services/hash_twins.ts
+++ b/app/services/hash_twins.ts
@@ -11,9 +11,11 @@ export async function twinNames(
 ): Promise<Map<string, string>> {
   const out = new Map<string, string>()
   if (pairs.length === 0) return out
+  // hash16k typed as the column (char(32)): as text the join cast the column and scanned all of file_hashes
+  // instead of file_hashes_hash_size_release_idx, 4 s a call (LOG.md (138)).
   const { rows } = await trx.rawQuery(
     `SELECT DISTINCT ON (h.hash16k, h.size) h.hash16k, h.size, coalesce(r.inner_name, r.name) AS name
-     FROM jsonb_to_recordset(?::jsonb) AS v(hash16k text, size bigint)
+     FROM jsonb_to_recordset(?::jsonb) AS v(hash16k char(32), size bigint)
      JOIN file_hashes h ON h.hash16k = v.hash16k AND h.size = v.size
      JOIN releases r ON r.id = h.release_id AND (r.readable OR r.inner_name IS NOT NULL)
      WHERE NOT EXISTS (SELECT 1 FROM release_verdicts x WHERE x.release_id = r.id)