A JSON assert happens when a JSON member is either missing or has
unexpected type. rapidjson has a very unhelpful "json assert failed"
message for this, with a backtrace (somewhat helpful), with no other
context. To help debug such errors, collect all request sent to the API
and dump them when such errors happen. The backtrace with the full
request history should be enough to debug any such issues.
Refs CUSTOMER-17
Closesscylladb/scylladb#26899