* Store the size of a store path in the database (to be precise, the

size of the NAR serialisation of the path, i.e., `nix-store --dump
  PATH').  This is useful for Hydra.

src/libstore/schema.sql

@@ -3,7 +3,8 @@ create table if not exists ValidPaths (
     path             text unique not null,
     hash             text not null,
     registrationTime integer not null,
-    deriver          text
+    deriver          text,
+    narSize          integer
 );
 
 create table if not exists Refs (