Support the compact API that retains the stale data up to a given file-level snapshot marker.

In some cases, an application wants to retain the stale data up to a given snapshot marker that corresponds to one of the commit headers in a database file. For this, the following new APIs should be provided:

typedef struct

{ fdb_seqnum_t seqnum; // committed sequence number for a given KV store. const char *kv_store_name; // NULL-terminated KV store name }

fdb_kvs_commit_marker_t;

/*

• fdb_snapshot_marker_t is an opaque file-level snapshot marker that can be used to purge the stale data up to a given snapshot marker.
  */
  typedef struct
  Unknown macro: { fdb_snapshot_marker_t marker; // opaque file-level snapshot marker uint64_t num_kvs_markers; // number of elements in the array below fdb_kvs_commit_marker_t *kvs_markers; // pointer to an array of {seqnum, kv_store_name} pairs }

  ;
  } fdb_snapshot_info_t;

/**

• Return all the snapshot markers in a given database file.
  */
  fdb_status fdb_get_all_snap_markers(fdb_file_handle *fhandle, fdb_snapshot_info_t **markers, int *size);

/**

• Compact the database file by retaining the stale data up to a given file-level snapshot marker.
  */
  fdb_status fdb_compact_upto(fdb_file_handle *fhandle,
  const char *new_filename,
  fdb_snapshot_marker_t marker);