Is there any way to clear all tables using Liquibase?
I guess the fastest way would be to use a custom sql tag that uses  truncate ... cascade on all "top-level" tables. 

Using the cascade keyword for truncate will also (recursively) delete all rows from all dependent tables (all tables referencing the one that is being truncated). 

Something like:

&lt;sql&gt;
   truncate table parent_1, parent_2, foobar cascade;
&lt;/sql&gt;


Don't know if that is feasible with the number of tables you have or not.