<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def sync_unwanted(database):
 """Context manager for preventing unwanted sync queries. `UnwantedSyncQueryError` exception will raise on such query. NOTE: sync_unwanted() context manager is **deprecated**, use database's `.allow_sync()` context manager or `Manager.allow_sync()` context manager. """

    warnings.warn("sync_unwanted() context manager is deprecated, "
                  "use database's `.allow_sync()` context manager or "
                  "`Manager.allow_sync()` context manager. ",
                  DeprecationWarning)
    old_allow_sync = database._allow_sync
    database._allow_sync = False
    yield
    database._allow_sync = old_allow_sync