attach 'second.db' as toMerge;
BEGIN;
insert into AuditRecords select * from toMerge.AuditRecords;
COMMIT;
detach toMerge;
==== Second method ====
$sqlite3 database1.db '.dump' >> tmp
$sqlite3 database2.db '.dump' >> tmp
$sqlite3 database3.db '.import tmp table1'
...
$sqlite3 database3.db '.import tmp tableX'
$ #sometimes sqlite3 database3.db < 'tmp' instead of last row