diff --git a/nix/infra/backend.nix b/nix/infra/backend.nix
index f142bae..42ef40e 100644
--- a/nix/infra/backend.nix
+++ b/nix/infra/backend.nix
@@ -35,5 +35,9 @@ in
         ensureDBOwnership = true;
       }
     ];
+    initialScript = pkgs.writeText "init-sql-script" ''
+      alter user postgres with password 'postgres';
+      alter user ${user} with password '${user}';
+    '';
   };
 }