OBKV Table Client is Rust Library that can be used to access table data from OceanBase storage layer. Its access method is different from JDBC, it skips the SQL parsing layer, so it has significant performance advantage.
webmention-receiver is a simple program that receives webmentions, records them to a SQLite database, and allows viewing them via a webpage or RSS feed. It has no conception of an "account", and by default will accept webmentions for any domain. It is possible to configure it to only accept webmentions for a specific set of domains, if you'd prefer.