old_contents: from flask import Blueprint
  
  api = Blueprint('api', __name__)
  
  #
  # end-points to create
  
  # query
  from . import query
  
  #
  # traces
  # services
  # spans
  # annotations
  # dependencies
  
  # pin
  from . import pin
  
new_contents: from flask import Blueprint
  
  api = Blueprint('api', __name__)
  
  #
  # end-points to create
  
  # query
  from . import query
  
  # services
  from . import services
  
  #
  # traces
  # services
  # spans
  # annotations
  # dependencies
  
  # pin
  from . import pin
  
subject: connect services to api