frontend: example: csv-import helper update

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

frontend/examples/csv-import/main.rs

@@ -49,13 +49,16 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     use tracing_subscriber::fmt;
     use viperus::Viperus;
 
+    //static DEFAULT_FILTER: &str = concat!(module_path!(), "=", "trace");
+
     // initialize the tracing subsystem
     // a drop in replacement for classical logging
     // reference: https://tokio.rs/blog/2019-08-tracing/
     let span = tracing::span!(Level::TRACE, "csv-import");
     let _enter = span.enter();
     let subscriber = fmt::Subscriber::builder()
-        .with_env_filter("csv-import=trace")
+        .with_env_filter("trace")
+        //.with_max_level(tracing::Level::DEBUG)
         .finish();
 
     // initialize logger