Create a batch of model events (deprecated)
Deprecated. Use POST /v1/events/batch with event_type="model" on each event instead. Migration notes: the top-level array model_events becomes events; each element must explicitly set event_type: "model" (the legacy route sets this server-side); the deprecated top-level aliases is_single_session and session are not accepted by the v1 route (PostEventBatchRequest is .strict()); use single_session and session_properties instead. The legacy route continues to serve traffic and remaps the model-specific fields on each event (model, messages, response, provider, usage, cost, hyperparameters, template, template_inputs, tools, tool_choice, response_format, duration, error) into inputs.* / outputs.* before storage.

