create table ACT_HI_TASKINST (
    ID_ NVARCHAR2(64) not null,
    PROC_DEF_ID_ NVARCHAR2(64),
    TASK_DEF_KEY_ NVARCHAR2(255),
    PROC_INST_ID_ NVARCHAR2(64),
    EXECUTION_ID_ NVARCHAR2(64),
    NAME_ NVARCHAR2(255),
    DESCRIPTION_ NVARCHAR2(255),
    ASSIGNEE_ NVARCHAR2(64),
    START_TIME_ TIMESTAMP(6) not null,
    END_TIME_ TIMESTAMP(6),
    DURATION_ NUMBER(19,0),
    DELETE_REASON_ NVARCHAR2(255),
    primary key (ID_)
);

alter table ACT_HI_DETAIL add TASK_ID_ NVARCHAR2(64);