The sql migration to clear PP database.

pp_clear_records.sql

delete from purification_steps;
delete from tm_plus_compound;
delete from small_scale_purification_tasks;
delete from large_scale_purification_tasks;
delete from purification_schemes;
delete from large_scale_expression_tasks_mois;
delete from large_scale_expression_tasks_final_properties;
delete from large_scale_expression_tasks_clones;
delete from large_scale_expression_tasks;
delete from expression_tasks_mois;
delete from expression_tasks;
delete from clone_tasks_protein_sequences;
delete from clone_task_protein_production_request;
delete from clone_tasks;
delete from protein_production_requests;