flowStep 
  abstract suspend fun flowStep(wideEventId: Long, stepName: String, success: Boolean = true, metadata: Map<String, String> = emptyMap()): Result<Unit>
Record a step in an active flow.
Parameters
wideEventId  
ID of the wide event.
stepName 
Step label (e.g., "account_created").
success
Whether this step succeeded.
metadata
Optional metadata.