diff --git a/frontend/examples/csv-import/csv_import.rs b/frontend/examples/csv-import/csv_import.rs
new file mode 100644
index 0000000..8a544ad
--- /dev/null
+++ b/frontend/examples/csv-import/csv_import.rs
@@ -0,0 +1,58 @@
+/// Commandline program testing csv imports
+use log::{info, trace, warn};
+use serde::Deserialize;
+use std::{
+    error::Error,
+    io,
+    process,
+    thread,
+    time::{Duration, Instant}};
+
+mod parse_args;
+
+#[derive(Debug, Deserialize)]
+struct Environment {
+    test_lang: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct CsvImportRecord {
+    // dion               => Allianz Dion: 1
+    // policy_code        => Policy Typ: "AS"
+    // policy_number      => Versicherungsscheinnummer: "1515735810"
+    pub dion: String,
+    pub policy_code: String,
+    pub policy_number: u32,
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    use parse_args::parse_args;
+
+    use std::net::ToSocketAddrs;
+    use std::process;
+    use std::sync::Arc;
+
+    use viperus::Viperus;
+
+    // initialize logger
+    env_logger::init();
+    info!("Commencing the proxy!");
+
+    // initialize viperus structure
+    let mut v = Viperus::new();
+
+    // parse commandline arguments
+    info!(target: "csv_import", "parsing commandline args");
+    parse_args(&mut v)?;
+    trace!(target: "Viperus", "Config results: {:?}", v);
+
+    // create a new NextCloudTalk client
+    let config = matches.value_of("config").unwrap_or("advotracker.conf");
+    let csv_import = matches.value_of("import").unwrap_or("allianz.txt");
+    //let username = matches.value_of("username").unwrap_or("nctalkbot");
+    //let password = matches.value_of("password").unwrap_or("botpassword");
+    let verbose = matches.occurrences_of("verbose");
+
+    Ok(())
+}
diff --git a/frontend/examples/csv-import/csv_import_bak.rs b/frontend/examples/csv-import/csv_import_bak.rs
new file mode 100644
index 0000000..7ec275b
--- /dev/null
+++ b/frontend/examples/csv-import/csv_import_bak.rs
@@ -0,0 +1,94 @@
+/* advotracker infrastructure.
+ *
+ * Copyright 2020 Ralf Zerres <ralf.zerres@networkx.de>
+ * SPDX-License-Identifier: (0BSD or MIT)
+ */
+
+// Rust nightly supports procedural macros!
+//#![feature(proc_macro)]
+//#![deny(rust_2018_idioms)]
+
+use dotenv::dotenv;
+use locales::t;
+use serde::Deserialize;
+
+use std::env;
+use std::error::Error;
+use std::io;
+use std::process;
+
+use tracing::{debug, trace, Level};
+
+#[derive(Deserialize, Debug)]
+struct Environment {
+    test_lang: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct CsvImportRecord {
+    // dion               => Allianz Dion: 1
+    // policy_code        => Policy Typ: "AS"
+    // policy_number      => Versicherungsscheinnummer: "1515735810"
+    pub dion: String,
+    pub policy_code: String,
+    pub policy_number: u32,
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // the YAML file is found relative to the current file
+    //use clap_v3::{load_yaml, App};
+    use clap::{load_yaml, App};
+
+    let yaml = load_yaml!("cli.yml");
+    //let matches = App::from_yaml(yaml).get_matches();
+    let matches = App::from_yaml(yaml)
+        .name(clap::crate_name!())
+        .version(clap::crate_version!())
+        .author(clap::crate_authors!())
+        .about(clap::crate_description!())
+        .get_matches();
+
+    // Gets the option value if supplied by user, otherwise set defaults
+    let config = matches.value_of("config").unwrap_or("advotracker.conf");
+    let csv_import = matches.value_of("import").unwrap_or("allianz.txt");
+    //let username = matches.value_of("username").unwrap_or("nctalkbot");
+    //let password = matches.value_of("password").unwrap_or("botpassword");
+    let verbose = matches.occurrences_of("verbose");
+
+    if verbose > 0 {
+        println!("{}: runtime parameters", clap::crate_name!());
+        println!("config_file: '{}'", config);
+        println!("csv_import: '{}'", csv_import);
+        println!("verbosity level: {}", matches.occurrences_of("verbose"));
+    }
+
+    if verbose > 1 {
+        println!("\nEnvironment:");
+        for (key, value) in env::vars() {
+            println!("{}={}", key, value);
+        }
+    }
+
+    Ok(())
+}
+
+/// import from csv format (Standard in)
+fn import() -> Result<(), Box<dyn Error>> {
+    // Build the CSV reader and iterate over each record.
+    let mut csv_reader = csv::Reader::from_reader(io::stdin());
+    for result in csv_reader.deserialize() {
+        // The iterator yields Result<StringRecord, Error>, so we check the
+        // error here.
+        let record: CsvImportRecord = result?;
+        println!("{:?}", record);
+    }
+    Ok(())
+}
+
+fn main() {
+    if let Err(err) = import() {
+        println!("error running CSV-Import: {}", err);
+        process::exit(1);
+    }
+}
diff --git a/frontend/examples/csv-import/locales/main.json b/frontend/examples/csv-import/locales/main.json
new file mode 100644
index 0000000..b6caee8
--- /dev/null
+++ b/frontend/examples/csv-import/locales/main.json
@@ -0,0 +1,78 @@
+{
+  "err.lang.not_found": {
+    "de_DE.UTF-8": "Konnte Sprachkode nicht auslesen",
+    "de": "Konnte Sprachkode nicht auslesen",
+    "en": "Couldn't read LANG"
+  },
+  "err.user.not_found": {
+    "fr": "Utilisateur introuvable: $email, $id",
+    "de-DE.UTF-8": "Anwender nicht gefunden: $email, $id",
+    "de": "Anwender nicht gefunden: $email, $id",
+    "en": "User not found: $email, $id"
+  },
+  "main.started": {
+    "de_DE.UTF-8": "Programmlogik starten",
+    "de": "Programmlogik starten",
+    "en": "Program logic started"
+  },
+  "main.finished": {
+    "de_DE.UTF-8": "Programmlogik beendet",
+    "de": "Programmlogik beendet",
+    "en": "Program logic finished"
+  },
+  "parse.arguments": {
+    "de_DE.UTF-8": "Programmargumente prüfen",
+    "de": "Programmargumente prüfen",
+    "en": "Parsing arguments"
+  },
+  "parse.environment": {
+    "de_DE.UTF-8": "Umgebungsvariablen prüfen",
+    "de": "Umgebungsvariablen prüfen",
+    "en": "Parsing environment"
+  },
+  "parse.results": {
+    "de_DE.UTF-8": "Ergebnisse der Konfigurations-Parameterprüfung",
+      "de": "Ergebnisse der Konfigurationsparameterprüfung",
+    "en": "Config parsing results"
+  },
+  "config.name": {
+    "de_DE.UTF-8": "Konfigurationswert für",
+    "de": "Konfigurationswert für",
+    "en": "Config Value for"
+  },
+  "config.name.lang": {
+    "de_DE.UTF-8": "Sprach-Code",
+    "de": "Sprach-Code",
+    "en": "Language code"
+  },
+  "config.name.verbositylevel": {
+    "de_DE.UTF-8": "Ausgabe-Ebene",
+    "de": "Ausgabe-Ebene",
+    "en": "verbosity level"
+  },
+  "config.name.environment": {
+    "de_DE.UTF-8": "Umgebungsvariablen",
+    "de": "Umgebungsvariablen",
+    "en": "environment"
+  },
+  "config.name.configfile": {
+    "de_DE.UTF-8": "Konfigurations-Datei",
+    "de": "Konfigurations-Datei",
+    "en": "config file"
+  },
+  "config.name.dbdriver": {
+    "de_DE.UTF-8": "Datenbank-Treiber",
+    "de": "Datenbank-Treiber",
+    "en": "database driver"
+  },
+  "state.started": {
+    "de_DE.UTF-8": "gestartet",
+    "de": "gestartet",
+    "en": "started"
+  },
+  "state.finished": {
+    "de_DE.UTF-8": "beendet",
+    "de": "beended",
+    "en": "finished"
+  }
+}
diff --git a/frontend/examples/csv-import/main.rs b/frontend/examples/csv-import/main.rs
new file mode 100644
index 0000000..2c73dbe
--- /dev/null
+++ b/frontend/examples/csv-import/main.rs
@@ -0,0 +1,114 @@
+/// Commandline program testing csv imports
+use serde::Deserialize;
+use std::env;
+use std::{
+     error::Error,
+     io,
+//     process,
+//     thread,
+    //     time::{Duration, Instant}
+};
+use tracing::{debug, trace, Level};
+
+mod parse_args;
+
+#[derive(Debug, Deserialize)]
+struct Environment {
+    test_lang: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct CsvImportRecord {
+    // dion               => Allianz Dion: 1
+    // policy_code        => Policy Typ: "AS"
+    // policy_number      => Versicherungsscheinnummer: "1515735810"
+    pub dion: String,
+    pub policy_code: String,
+    pub policy_number: u32,
+}
+
+/// import from csv format (Standard in)
+fn import() -> Result<(), Box<dyn Error>> {
+    // Build the CSV reader and iterate over each record.
+    let mut csv_reader = csv::Reader::from_reader(io::stdin());
+    for result in csv_reader.deserialize() {
+        // The iterator yields Result<StringRecord, Error>, so we check the
+        // error here.
+        let record: CsvImportRecord = result?;
+        println!("{:?}", record);
+    }
+    Ok(())
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    use dotenv::dotenv;
+    use parse_args::parse_args;
+    use locales::t;
+    //use std::process;
+    //use std::sync::Arc;
+    use tracing_subscriber::fmt;
+    use viperus::Viperus;
+
+    // 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")
+        .finish();
+
+    // initialize logger
+    //env_logger::init();
+    //info!("Commencing the import Test-Run!");
+
+    tracing::subscriber::with_default(subscriber, || {
+        // get system environment
+        let mut lang = env::var("LANG").unwrap_or("en".to_string());
+        let mut res = t!("parse.environment", lang);
+        let mut state = t!("state.started", lang);
+        trace!(target: "csv-import", message = ?res, state = ?state);
+        //debug!(message = ?res, state = ?state);
+        trace!(target: "csv-import", environment = "system", lang = ?lang);
+
+        // get testing environment (.env)
+        dotenv().ok();
+        match envy::from_env::<Environment>() {
+            Ok(environment) => {
+                if environment.test_lang != lang { lang = environment.test_lang; }
+            },
+            Err(e) => { debug!(target: "csv-import", "{}", e); }
+        }
+        res = t!("parse.environment", lang);
+        trace!(target: "csv-import", environment = "envy", lang = ?lang);
+        state = t!("state.finished", lang);
+        trace!(target: "csv-import", message = ?res, state = ?state);
+
+        // initialize viperus structure
+        let mut v = Viperus::new();
+
+        // parse commandline arguments
+        res = t!("parse.arguments", lang);
+        state = t!("state.started", lang);
+        trace!(target: "csv-import", process = ?res, state = ?state);
+
+        let _ = parse_args(&mut v);
+        state = t!("state.finished", lang);
+        trace!(target: "csv-import", process = ?res, state = ?state);
+        //trace!(target: "Viperus", "Config results: {:?}", v);
+
+        // Starting the program logic
+        res = t!("main.started", lang);
+        state = t!("state.started", lang);
+        trace!(target: "csv-import", process = ?res, state = ?state);
+
+        // import the given import file
+        let csv_file = v.get::<String>("import_file").unwrap();
+
+        state = t!("state.finished", lang);
+        res = t!("main.finished", lang);
+        trace!(target: "csv-import", process = ?res, state = ?state);
+    });
+
+    Ok(())
+}
diff --git a/frontend/examples/csv-import/parse_args.rs b/frontend/examples/csv-import/parse_args.rs
new file mode 100644
index 0000000..7f60109
--- /dev/null
+++ b/frontend/examples/csv-import/parse_args.rs
@@ -0,0 +1,151 @@
+use viperus::Viperus;
+
+/// The given Viperus structure will be muted according to the
+/// processed default, environment and commandline arguments
+pub fn parse_args(v: &mut Viperus) -> Result<(), Box<dyn std::error::Error>> {
+    //use log::{debug, info, trace, warn};
+    use log::trace;
+    use std::env;
+
+    if cfg!(feature = "fmt-clap") {
+        trace!(target: "Viperus", "Viperus feature 'fmt-clap' enabled.");
+        println!("Using feature fmt-clap");
+    }
+
+    // preset default key/value pairs (lowest priority)
+    v.add_default("config_file", String::from("csv_import.ron"));
+    v.add_default("import_file", String::from("allianz.txt"));
+    //v.add_default("username", String::from("nctalkbot"));
+    //v.add_default("password", String::from("botpassword"));
+    v.add_default("verbose", 0);
+
+    // parse CLI commandline arguments with clap
+    use clap::{crate_authors, crate_description, crate_name, crate_version, App, Arg};
+
+    // CLI arguments are defined inline
+    let matches = App::new("nctalkproxyd")
+        .name(crate_name!())
+        .version(crate_version!())
+        .author(crate_authors!())
+        .about(crate_description!())
+        .after_help("Test: Versicherungsnummern-Import Allianz DirectCall")
+        .template(
+            "\
+            {bin} v{version}
+{about}
+
+{all-args}
+
+(C) 2020 {author}
+{after-help}",
+        )
+        .arg(
+            Arg::with_name("configFile")
+                .short("c")
+                .long("configFile")
+                .value_name("FILE")
+                .help("Select a config file")
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name("importFile")
+                .short("i")
+                .long("importFile")
+                //.value_name("FILE")
+                .help("Select source file for the csv-import")
+                .takes_value(true),
+        )
+        // .arg(
+        //     Arg::with_name("username")
+        //         .short("u")
+        //         .long("username")
+        //         .help("Sets username")
+        //         .takes_value(true),
+        // )
+        // .arg(
+        //     Arg::with_name("password")
+        //         .short("P")
+        //         .long("password")
+        //         .help("Sets password")
+        //         .takes_value(true),
+        // )
+        .arg(
+            Arg::with_name("verbose")
+                .short("v")
+                .long("verbose")
+                .help("Sets verbosity level")
+                .multiple(true),
+        )
+        .get_matches();
+
+    if matches.occurrences_of("verbose") > 0 {
+        // clap is using i64, viperus i32
+        let n = matches.occurrences_of("verbose") as i32;
+        v.add("verbose", n);
+    }
+
+    // preset the prefix for relevant environment variables ("ADVOTRACKER_")
+    let mut env_prefix: String = crate_name!().to_uppercase();
+    env_prefix.push_str("_");
+    v.set_env_prefix(&env_prefix);
+
+    // respect dotenv environment (e.g for testing)
+    // -> overwrites the preset default values
+    println!(
+        "RUST_LOG={}",
+        dotenv::var("RUST_LOG").unwrap_or_else(|_| String::from("None"))
+    );
+
+    // enable caching and automatic update of environment values
+    if cfg!(feature = "fmt-cache") {
+        v.cache(true);
+    }
+    if cfg!(feature = "fmt-env") {
+        v.automatic_env(true);
+    }
+
+    // load user selected call arguments
+    // -> overwrites values given via environment variables
+    v.load_clap(matches)?;
+
+    // bond the clap names to camel_case rust variable names
+    v.bond_clap("configFile", "config_file");
+    v.bond_clap("importFile", "import_file");
+    //v.bond_clap("username", "username");
+    //v.bond_clap("password", "password");
+    v.bond_clap("verbose", "verbose");
+
+    trace!("verbose {:?}", v.get::<i32>("verbose").unwrap());
+    if v.get::<i32>("verbose").unwrap() > 0 {
+        println!(
+            "config_file: {:?}",
+            v.get::<String>("config_file").unwrap_or_default()
+        );
+        println!(
+            "import_file: {:?}",
+            v.get::<String>("import_file").unwrap_or_default()
+        );
+        // println!(
+        //     "username: {:?}",
+        //     v.get::<String>("username").unwrap_or_default()
+        // );
+        // println!(
+        //     "password: {:?}",
+        //     v.get::<String>("password").unwrap_or_default()
+        // ); // only for testing now
+
+        println!(
+            "verbosity level: {:?}",
+            v.get::<i32>("verbose").unwrap_or_default()
+        );
+    }
+
+    if v.get::<i32>("verbose").unwrap() > 1 {
+        println!("\nEnvironment:");
+        for (key, value) in env::vars() {
+            println!("{}={}", key, value);
+        }
+    }
+
+    Ok(())
+}