feat: report error count properly

src/import.rs

···
                     errors.len()
                 );
 
-                // todo: report errors
+                if !errors.is_empty() {
+                    error!(log, "{} entries failed to decode", errors.len());
+                }
+
                 for entry in &entries {
                     if let Err(e) = insert_did_and_op(&conn, entry).await {
                         error!(log, "failed to insert operation for did {}: {e}", entry.did);