message: Add duration to core config *in the rule superclass*
diff: @@ -19,6 +19,7 @@ class Rule(ABC):
  payment_cycle_length,
  start_block,
  end_block,
  + duration,
  subgraph_config_locations,
  docker_image=None,
  rollover=False,
  @@ -26,6 +27,7 @@ class Rule(ABC):
  self.payment_cycle_length = payment_cycle_length
  self.start_block = start_block
  self.end_block = end_block
  + self.duration = duration
  self.subgraph_config_locations = subgraph_config_locations
  self.rollover = rollover
  