alter table OS_HISTORYSTEP drop constraint historystep_entry_fk;alter table OS_CURRENTSTEP drop constraint currentstep_entry_fk;drop table OS_HISTORYSTEP;drop table OS_PROPERTYENTRY;drop table OS_WFENTRY;drop table OS_CURRENTSTEP;DROP TABLE hibernate_sequence;create table OS_HISTORYSTEP (   id BIGINT not null,   action_Id INTEGER,   caller VARCHAR(255),   finish_Date TIMESTAMP,   start_Date TIMESTAMP,   due_Date TIMESTAMP,   owner VARCHAR(255),   status VARCHAR(255),   step_Id INTEGER,   entry_Id BIGINT,   stepIndex INTEGER,   primary key (id));create table OS_PROPERTYENTRY (   entity_name VARCHAR(125) not null,   entity_id BIGINT not null,   entity_key VARCHAR(255) not null,   key_type INTEGER,   boolean_val BIT,   double_val DOUBLE,   string_val VARCHAR(255),   long_val BIGINT,   int_val INTEGER,   date_val DATE,   primary key (entity_name, entity_id, entity_key));create table OS_WFENTRY (   id BIGINT not null,   name VARCHAR(255),   state INTEGER,   primary key (id));create table OS_CURRENTSTEP (   id BIGINT not null,   action_Id INTEGER,   caller VARCHAR(255),   finish_Date TIMESTAMP,   start_Date TIMESTAMP,   due_Date TIMESTAMP,   owner VARCHAR(255),   status VARCHAR(255),   step_Id INTEGER,   entry_Id BIGINT,   stepIndex INTEGER,   primary key (id));alter table OS_HISTORYSTEP add constraint historystep_entry_fk foreign key (entry_Id) references OS_WFENTRY;alter table OS_CURRENTSTEP add constraint currentstep_entry_fk foreign key (entry_Id) references OS_WFENTRY;CREATE TABLE hibernate_sequence(   id NUMERIC);