* [feat]: Add truncate option to flush command
* [test]: Add test cases for flush command with truncate
* [refactor]: Simplified truncate query class and remove redundant return statement
* [test]: Add test cases to test truncate for unsupported database vendor
* [docs]: Update change log
* run postgres query for rows that changes is null for them and there is value for changes_text
* add a test case to make when changes has value it wont be overwritten by changes_text
