route-update: skip history merge for IP-only lists

router/route-update.sh

@@ -552,19 +552,23 @@ resolve_list_file()
     [ "$_bad" -gt 0 ] && log "$_tag$_label WARNING: filtered out $_bad invalid entries from DNS resolve" || true
     rm -f "$_resolved_new.tmp"
 
-    # Accumulate resolve history (DNS round-robin)
-    local history_dir="$STATE_DIR/$_state/resolve_history"
-    mkdir -p "$history_dir"
-    rm -f "$history_dir/$HISTORY_SIZE"
-    local i=$((HISTORY_SIZE - 1))
-    while [ $i -ge 1 ] ; do
-        [ -f "$history_dir/$i" ] && mv "$history_dir/$i" "$history_dir/$((i + 1))"
-        i=$((i - 1))
-    done
-    cp "$_resolved_new" "$history_dir/1"
-    sort -u "$history_dir"/* > "${_resolved_new}.merged"
-    mv "${_resolved_new}.merged" "$_resolved_new"
-    vlog "$_tag$_label resolve history: $(ls "$history_dir" | wc -l) snapshots, $(wc -l < "$_resolved_new") unique IPs"
+    # Accumulate resolve history (DNS round-robin) — only for lists with domains
+    if grep -v '^#' "$_f" | grep -q '[a-zA-Z]' ; then
+        local history_dir="$STATE_DIR/$_state/resolve_history"
+        mkdir -p "$history_dir"
+        rm -f "$history_dir/$HISTORY_SIZE"
+        local i=$((HISTORY_SIZE - 1))
+        while [ $i -ge 1 ] ; do
+            [ -f "$history_dir/$i" ] && mv "$history_dir/$i" "$history_dir/$((i + 1))"
+            i=$((i - 1))
+        done
+        cp "$_resolved_new" "$history_dir/1"
+        sort -u "$history_dir"/* > "${_resolved_new}.merged"
+        mv "${_resolved_new}.merged" "$_resolved_new"
+        vlog "$_tag$_label resolve history: $(ls "$history_dir" | wc -l) snapshots, $(wc -l < "$_resolved_new") unique IPs"
+    else
+        vlog "$_tag$_label IP-only list, skipping history merge"
+    fi
 
     # Detect volatile domains (IPv4 and IPv6)
     if grep -v '^#' "$_f" | grep -q '[a-zA-Z]' ; then