diff --git a/home/programs/custom-nix-cache.nix b/home/programs/custom-nix-cache.nix
index a01292c..12c38ab 100644
--- a/home/programs/custom-nix-cache.nix
+++ b/home/programs/custom-nix-cache.nix
@@ -14,7 +14,8 @@ in
       sudo mkdir ${cache.rootDir}/.aws 2> /dev/null
       sudo cp "$HOME/.aws/credentials" ${cache.rootDir}/.aws/
 
-      uncachedHashes=$(echo 'SELECT DISTINCT hashPart FROM NARs WHERE present = 0;' | sudo sqlite3 "${cache.database}")
+      minTimestamp=$(expr $(date +%s) - 3600)
+      uncachedHashes=$(echo "SELECT DISTINCT hashPart FROM NARs WHERE present = 0 AND timestamp >= $minTimestamp;" | sudo sqlite3 "${cache.database}")
       signingKey="$HOME/.config/nifoc-nix/${cache.signingKey}"
 
       for uncachedHash in $uncachedHashes; do
@@ -35,10 +36,10 @@ in
         if [ "$1" = "--list" ]; then
           echo "$storePath"
         else
-          nix store sign --key-file $signingKey $storePath
+          sudo -H nix store sign --key-file $signingKey $storePath
 
           echo "Uploading $storePath ..."
-          nix copy --to '${cache.s3Url}' $storePath
+          sudo -H nix copy --to '${cache.s3Url}' $storePath
         fi
       done
     '';