'Clear the in memory symbol lookup maps.
This will make any changes to the underlying db available to the
symbol maps.'

def reload_symbol_maps(self):

    try:
        del type(self).symbol_ownership_map[self]
    except KeyError:
        pass
    try:
        del type(self).fuzzy_symbol_ownership_map[self]
    except KeyError:
        pass
    try:
        del type(self).equity_supplementary_map[self]
    except KeyError:
        pass
    try:
        del type(self).equity_supplementary_map_by_sid[self]
    except KeyError:
        pass
