Based on the knowledge sources provided, I can answer your question about the 'networks' table in Ory Hydra. According to the official response in a GitHub discussion about Ory Hydra version 2.2.0, the 'networks' table and the 'nid' field in other tables are internal values that currently have no real effect in the codebase. This information comes from [a GitHub discussion](https://github.com/ory/hydra/discussions/3745) where a user asked about the purpose of this table. Regarding self-hosting, the knowledge sources do not provide any specific information about how this table might be used or if it serves any particular purpose when self-hosting Ory Hydra. It's important to note that this table appears to be a recent addition (as of version 2.2.0) and its purpose may not be fully implemented or documented yet. When self-hosting Ory Hydra, you likely don't need to interact with or manage this table directly based on the current information available. If you need more detailed information about this table or its potential future use, you may want to consult the latest Ory Hydra documentation or reach out to the Ory community for more up-to-date information.