lwt: use cached truncation record instead of quering the database
lwt: use cached truncation record instead of quering the database

Message-Id: <b1fed2d82c39d6428f8fab21524d6c2061e10dc0@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla