on_info = {=trading =trade_exchanged} mob_trader@new_trade_exchanged
on_info2 = {!trading =trade_exchanged} mob_trader@new_trade_good
on_info3 = {!trading !trade_exchanged} mob_trader@new_trade_bad

function trade_exchanged(actor, npc)
    return db.storage[npc:id()].trade.exchanged
end

function trading(actor, npc)
    return db.storage[npc:id()].trade.trading
end

function mob_trade:start_trade(zone, obj)
    ...
    trade.trading = true
    trade.exchanged = false
        ...
end

function mob_trade:end_trade()
    ...
    trade.trading = false
    ...
end

function mob_trade:on_trade(obj, type)
    ...
    trade.exchanged = true
        ...
end

[logic]
active = sr_idle@spawn

[sr_idle@spawn]
on_info  = {+esc_army_goto_smart_0_1_respawn} %=create_squad(esc_army_goto_smart_0_1:esc_smart_terrain_0_0) -esc_army_goto_smart_0_1_dead%

[sr_idle@exist]
on_info  = {+esc_army_goto_smart_0_1_dead !squad_exist(esc_army_goto_smart_0_1)} sr_idle@timer

[sr_idle@timer]
on_game_timer = 3600 | sr_idle@spawn

[esc_army_goto_smart_0_1]:online_offline_group
...
on_death = %+esc_army_goto_smart_0_1_dead%
...

function npc_in_zone(actor, npc, p)
    local zone = db.zone_by_name[p[1]]

    if type(npc.id) ~= "function" then
  npc_obj = db.storage[npc.id] and db.storage[npc.id].object
  if zone == nil then
   return true
  end

  if npc_obj == nil then
   return zone:inside(npc.position)
  end
    else
  npc_obj = npc
    end

    return utils.npc_in_zone(npc_obj, zone)
end

on_info = {=my_npc_in_zone(zone_name:npc_stori_id) +my_npc_is_dead} ...