code: def bake_content(request):
      
      ident_hash = request.matchdict['ident_hash']
      try:
          id, version = split_ident_hash(ident_hash)
      except IdentHashError:
          raise httpexceptions.HTTPNotFound()
  
      if not version:
          raise httpexceptions.HTTPBadRequest('must specify the version')
  
      with db_connect() as db_conn:
          with db_conn.cursor() as cursor:
              cursor.execute("""\
  SELECT bool(portal_type = 'Collection'), stateid, module_ident
  FROM modules
  WHERE ident_hash(uuid, major_version, minor_version) = %s
  """, (ident_hash,))
              try:
                  is_binder, stateid, module_ident = cursor.fetchone()
              except TypeError:
                  raise httpexceptions.HTTPNotFound()
              if not is_binder:
                  raise httpexceptions.HTTPBadRequest(
                      '{} is not a book'.format(ident_hash))
  
              if stateid == 5:
                  cursor.execute("""\
  SELECT pg_notify('post_publication',
  '{"module_ident": '||%s||',
    "ident_hash": "'||%s||'",
    "timestamp": "'||CURRENT_TIMESTAMP||'"}')
  """, (module_ident, ident_hash))
              else:
                  cursor.execute("""\
  UPDATE modules SET stateid = 5
  WHERE ident_hash(uuid, major_version, minor_version) = %s
  """, (ident_hash,))
docs: Invoke the baking process - trigger post-publication