Importer: Fail gracefully & record failures
The import should not abruptly fail. The import can currently fail for various reasons (timeouts, validation failures etc.) We should instead make it collect entities that we failed to process and skip them. Along the way we should keep a record of these failures so that we know what's missing after the import ends, probably in a new database table. We may also want to consider recording import progress in Redis.
Edited by Matthias Käppler