text: #pragma once
  
  #include <axon/utils.h>
  #include <axon/codes.h>
  
  typedef void (*freeFunction)(void *payload);
  
  typedef struct sAxonCallbackData {
    freeFunction freePayload;
    void *payload;
    char *sql;
    size_t len;
    int flags;
  } AxonCallbackData;
  
  