desctruct info for exporter

crates/api-grub/src/export.rs

@@ -5,6 +5,7 @@ use tokio_postgres::NoTls;
 use std::env;
 use anyhow::Result;
 use log::{info, error};
+use std::ops::Drop;
 
 /// An entity which handles DB connections.
 /// 
@@ -101,4 +102,10 @@ impl Exporter {
         Ok(metrics.get_bytes_len())
     }
 
+}
+
+impl Drop for Exporter {
+    fn drop(&mut self) {
+        info!("Deinitializng Exporter and DB connection pool ...")
+    }
 }