create table process_definitions (
  process_definition_name text not null,
  paused boolean,
  process_description text,
  schedule ,
  task_definitions ,
  overlap_action text references process_overlap_actions not null default 'wait',
  notifications 
);
comment on table process_definitions is '
  A grouping of related tasks that are run as a single unit on the same schedule
';

comment on column process_definitions.paused is '
  If true, ignore schedule and only start process if triggered manually
';
comment on column process_definitions.schedule is '
  The schedule that the process runs on; if not specified, the process will only run when triggered manually
';