For those (especially studio users) who may find it useful...

Normal Server action:

for record in records:
  if record.x_save_history:
    vals = {
      'x_name' = record.x_name,
      'x_value' = record.x_val
    }
    env['x_history'].create(vals)


used for all records selected is creating same result as below scheduled action:

Scheduled action:

recs = model.search([])

for rec in recs:
  if rec.x_save_history:
    vals = {
      'x_name' = rec.x_name,
      'x_value' = rec.x_val
    }
    env['x_history'].create(vals)