In reading the 7.4.2 docs, the sql reference page for PREPARE doesn't

In reading the 7.4.2 docs, the sql reference page for PREPARE doesn't
reference DEALLOCATE in any way. It points to EXECUTE, but not to
DEALLOCATE. Suggested fix:

... This also means that a single  prepared statement cannot be used by
multiple simultaneous database clients; however, each client can create
their own prepared statement  to use. The prepared statement can be
manually cleaned up using the DEALLOCATE command.

James Robinson