We are using Prodigy 1.10.8 with multi user sessions.
To make process simple we build an "identification" service, where we encode user identification credentials into base64 and pass it as session id.
For example for me it will be
ZXZnZW55LmJhemFyb3ZAYmVzZWRvLmNvbQ==, so at any time I will want to connect to prodigy I will use it as my session id.
When I check DB I see that session id was not stored as metadata, also I saw that session without
= character stored correctly.
I don't know if it's expected behaviour or some bug on our end.