DROP TABLE IF EXISTS staff_payroll_ledger;
DROP TABLE IF EXISTS staff_payouts;
DROP TABLE IF EXISTS staff_payroll_lines;
DROP TABLE IF EXISTS staff_payroll_runs;
DROP TABLE IF EXISTS staff_work_sessions;
DROP TABLE IF EXISTS staff_pay_assignments;
DROP TABLE IF EXISTS staff_pay_rules;
DROP TABLE IF EXISTS staff_work_items;
DROP TABLE IF EXISTS staff_daily_metrics;
DROP TABLE IF EXISTS staff_metric_definitions;

ALTER TABLE staff_attendance_events
  DROP CONSTRAINT IF EXISTS staff_attendance_events_org_unit_fk,
  DROP COLUMN IF EXISTS payload,
  DROP COLUMN IF EXISTS org_unit_id;

ALTER TABLE staff_employees
  DROP CONSTRAINT IF EXISTS staff_employees_primary_org_unit_fk,
  DROP COLUMN IF EXISTS terminated_on,
  DROP COLUMN IF EXISTS hired_on,
  DROP COLUMN IF EXISTS external_ref,
  DROP COLUMN IF EXISTS primary_org_unit_id;

DROP TABLE IF EXISTS staff_org_unit_terms;
DROP TABLE IF EXISTS staff_org_units;