Document errors

src/errors.rs

@@ -1,11 +1,15 @@
-use axum::http::StatusCode;
-use axum::response::{IntoResponse, Response};
+use axum::{
+    http::StatusCode,
+    response::{IntoResponse, Response},
+};
 use tracing::error;
 
+/// App error for conversion to anyhow error.
 pub struct AppError(anyhow::Error);
 
 impl IntoResponse for AppError {
     fn into_response(self) -> Response {
+        // Log error.
         error!("{:?}", self.0);
 
         StatusCode::BAD_REQUEST.into_response()