Response
4 bytes	Magic number 49 47 4E 49, or "IGNI". Helps identifying misconfigured SSL or different server on the port.
int	Payload length
int	Server version major
int	Server version minor
int	Server version patch
int	Error code (0 for success)	boolean	Success flag
stringWhen	success flag is false: Error message (when error code is not 0)
bin	When success flag error code is true0: Server features (bitmask)
map (string → any)	When success flag error code is true0: Extensions (auth, attributes, etc). Client can skip unknown extension data (when server is newer).

Clients should retrieve schemas with SCHEMAS_GET and cache them per table.

Request
UUID	table ID
arr	schema IDs

Response
arr	schemas (TODO: details)

Risks and Assumptions

TODO

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