':type dbConn: Connection'

def __init__(self, dbConn):

    self.dbConn = dbConn
    dbConn.execute('CREATE    TABLE    IF    NOT    EXISTS    sender_keys    (_id    INTEGER    PRIMARY    KEY    AUTOINCREMENT,group_id    TEXT    NOT    NULL,sender_id    INTEGER    NOT    NULL,    record    BLOB);')
    dbConn.execute('CREATE    UNIQUE    INDEX    IF    NOT    EXISTS    sender_keys_idx    ON    sender_keys    (group_id,    sender_id);')
