diff --git a/nullptr/analyzer.py b/nullptr/analyzer.py
index cc63255..4963456 100644
--- a/nullptr/analyzer.py
+++ b/nullptr/analyzer.py
@@ -153,8 +153,7 @@ class Analyzer:
   def prices(self, system):
     prices = {}
     for m in self.store.all_members(system, Marketplace):
-      for p in m.prices.values():
-        r = p['symbol']
+      for r, p in m.prices.items():
         if not r in prices:
           prices[r] = []
         prices[r].append({
@@ -168,7 +167,7 @@ class Analyzer:
     prices = self.prices(system)
     occupied_resources = set()
     for s in self.store.all('Ship'):
-      if s.mission != 'haul':
+      if s.mission != 'trade':
         continue
       occupied_resources.add(s.mission_state['resource'])
     best = None
diff --git a/nullptr/central_command.py b/nullptr/central_command.py
index 46f2f46..b211312 100644
--- a/nullptr/central_command.py
+++ b/nullptr/central_command.py
@@ -1,7 +1,7 @@
 from nullptr.store import Store
 from nullptr.models.ship import Ship
 from nullptr.missions import create_mission, get_mission_class
-from random import choice
+from random import choice, randrange
 from time import sleep
 from threading import Thread
 from nullptr.atlas_builder import  AtlasBuilder
@@ -106,10 +106,23 @@ class CentralCommand:
         
         
   def assign_mission(self, s):
-    if s.role == 'hauler':
-      self.assign_haul(s)
+    if s.role == 'trader':
+      self.assign_trade(s)
+    elif s.role == 'probe':
+      self.assign_probe(s)
   
-  def assign_haul(self, s):
+  def assign_probe(self, s):   
+    system = s.location.system
+    m = [m.waypoint for m in self.store.all_members(system, 'Marketplace')]
+    m = self.analyzer.solve_tsp(m)
+    hops = [w.symbol for w in m]
+    start_hop = randrange(0, len(hops))
+    print(f'Assigning {s} to probe {len(hops)} starting at {hops[start_hop]}')
+    self.init_mission(s, 'probe')
+    self.smipa(s, 'hops', hops)
+    self.smipa(s, 'next-hop', start_hop)
+    
+  def assign_trade(self, s):
     t = self.analyzer.find_trade(s.location.system)
     if t is None:
       print(f"No trade for {s} found. Idling")
@@ -117,7 +130,7 @@ class CentralCommand:
       self.smipa(s, 'seconds', 600)
       return
     print(f'assigning {s} to deliver {t.resource} from {t.source} to {t.dest} at a margin of {t.margin}')
-    self.init_mission(s, 'haul')
+    self.init_mission(s, 'trade')
     self.smipa(s, 'resource', t.resource)
     self.smipa(s, 'site', t.source)
     self.smipa(s, 'dest', t.dest)
diff --git a/nullptr/commander.py b/nullptr/commander.py
index 8c8b9bf..3ae6718 100644
--- a/nullptr/commander.py
+++ b/nullptr/commander.py
@@ -20,6 +20,7 @@ class Commander(CommandLine):
   def __init__(self, data_dir='data'):
     store_file = os.path.join(data_dir, 'store.npt')
     hist_file = os.path.join(data_dir, 'cmd.hst')
+    self.cred_file = os.path.join(data_dir, 'creds.txt')
     self.hist_file = hist_file
     if os.path.isfile(hist_file):
       readline.read_history_file(hist_file)
@@ -107,7 +108,7 @@ class Commander(CommandLine):
     if len(faction) > 50:
       self.agent.token = faction
     else:
-      api.register(faction.upper().strip())
+      self.do_register(faction)
     print('=== agent:')
     print(agent)
     print('=== ships')
@@ -126,6 +127,10 @@ class Commander(CommandLine):
   
   def do_register(self, faction):
     self.api.register(faction.upper())
+    with open(self.cred_file, 'w') as f:
+      f.write(self.api.agent.symbol)
+      f.write('\n')
+      f.write(self.api.agent.token)
     pprint(self.api.agent)
   
   ######## Fleet #########
@@ -306,7 +311,7 @@ class Commander(CommandLine):
     pprint(self.ship.mission_state)
   
   def do_role(self, role):
-    roles = [None, 'hauler']
+    roles = [None, 'trader', 'probe']
     if not self.has_ship(): return 
     if role == 'none':
       role = None
@@ -407,7 +412,7 @@ class Commander(CommandLine):
       return
     _, m, _, _ = m[0]
     site = self.store.get(Waypoint, m.symbol)
-    self.centcom.init_mission(self.ship, 'haul')
+    self.centcom.init_mission(self.ship, 'trade')
     self.centcom.set_mission_param(self.ship, 'site', site)
     self.centcom.set_mission_param(self.ship, 'resource', resource)
     self.centcom.set_mission_param(self.ship, 'dest', destination)
@@ -432,18 +437,6 @@ class Commander(CommandLine):
     self.centcom.set_mission_param(self.ship, 'hops', markets)
     self.print_mission()
   
-  def do_sprobe(self):
-    if not self.has_ship(): return     
-    system = self.ship.location.system
-    m = [m.waypoint for m in self.store.all_members(system, 'Marketplace')]
-    print("pre", path_dist(m))
-    m = self.analyzer.solve_tsp(m)
-    print("post", path_dist(m))
-    hops = [w.symbol for w in m]
-    self.centcom.init_mission(self.ship, 'probe')
-    self.centcom.set_mission_param(self.ship, 'hops', hops)
-    self.print_mission()
-  
   ######## Travel #########
   def do_travel(self, dest):
     dest = self.resolve('Waypoint', dest)
diff --git a/nullptr/missions/__init__.py b/nullptr/missions/__init__.py
index adb5c87..6d181aa 100644
--- a/nullptr/missions/__init__.py
+++ b/nullptr/missions/__init__.py
@@ -1,6 +1,6 @@
 from nullptr.missions.survey import SurveyMission
 from nullptr.missions.mine import MiningMission
-from nullptr.missions.haul import HaulMission
+from nullptr.missions.trade import TradeMission
 from nullptr.missions.travel import TravelMission
 from nullptr.missions.probe import ProbeMission
 from nullptr.missions.idle import IdleMission
@@ -10,7 +10,7 @@ def get_mission_class( mtype):
   types = {
     'survey': SurveyMission,
     'mine': MiningMission,
-    'haul': HaulMission,
+    'trade': TradeMission,
     'travel': TravelMission,
     'probe': ProbeMission,
     'idle': IdleMission
diff --git a/nullptr/missions/mine.py b/nullptr/missions/mine.py
index ca128fc..6ebcce9 100644
--- a/nullptr/missions/mine.py
+++ b/nullptr/missions/mine.py
@@ -49,7 +49,7 @@ class MiningMission(BaseMission):
     site = self.rst(Waypoint,'site')
     # todo optimize
     for s in self.store.all(Survey):
-      if resource in s.deposits and site.symbol == s.waypoint():
+      if resource in s.deposits and site.symbol == s.waypoint:
         return s
     return None
     
diff --git a/nullptr/missions/haul.py b/nullptr/missions/trade.py
similarity index 96%
rename from nullptr/missions/haul.py
rename to nullptr/missions/trade.py
index 1b2bdd4..812406b 100644
--- a/nullptr/missions/haul.py
+++ b/nullptr/missions/trade.py
@@ -2,7 +2,7 @@ from nullptr.missions.base import BaseMission, MissionParam
 from nullptr.models.waypoint import Waypoint
 from nullptr.models.survey import Survey
 from nullptr.models.contract import Contract
-class HaulMission(BaseMission):
+class TradeMission(BaseMission):
   def start_state(self):
     return 'travel-to'
   
diff --git a/nullptr/models/base.py b/nullptr/models/base.py
index aec041c..9276670 100644
--- a/nullptr/models/base.py
+++ b/nullptr/models/base.py
@@ -14,6 +14,9 @@ class Reference:
     
   def resolve(self):
     return self.store.get(self.typ, self.symbol)
+  
+  def f(self, detail):
+    return f'{self.symbol}.{self.typ.ext()}'
     
   def __repr__(self):
     return f'*REF*{self.symbol}.{self.typ.ext()}'
@@ -46,6 +49,9 @@ class Base:
   def define(self):
     pass
     
+  def created(self):
+    pass
+    
   def __hash__(self):
     return hash((str(type(self)), self.symbol))
   
@@ -84,12 +90,16 @@ class Base:
     
   def __setattr__(self, name, value):
     if not name.startswith('_') and not self._disable_dirty:
-      self.store.dirty(self)
+      self.dirty()
     if issubclass(type(value), Base):
       value = Reference.create(value)
     super().__setattr__(name, value)
   
   def __getattribute__(self, nm):
+    if nm == 'system':
+      return self.get_system()
+    if nm == 'waypoint':
+      return self.get_waypoint()
     val = super().__getattribute__(nm)
     if type(val) == Reference:
       val = val.resolve()
diff --git a/nullptr/models/jumpgate.py b/nullptr/models/jumpgate.py
index e525029..9dd16b4 100644
--- a/nullptr/models/jumpgate.py
+++ b/nullptr/models/jumpgate.py
@@ -5,7 +5,6 @@ from dataclasses import field
 class Jumpgate(Base):
   def define(self):
     self.connections: list = []
-    self.system = self.get_system()
   
   def update(self, d):
     getter = self.store.getter(Waypoint, create=True)
diff --git a/nullptr/models/marketplace.py b/nullptr/models/marketplace.py
index f8f5f58..ee83a76 100644
--- a/nullptr/models/marketplace.py
+++ b/nullptr/models/marketplace.py
@@ -1,5 +1,5 @@
 
-from .base import Base
+from .base import Base, Reference
 from time import time
 from nullptr.util import *
 from dataclasses import field, dataclass
@@ -32,12 +32,9 @@ class Marketplace(Base):
     self.exchange:list = []
     self.prices:dict = {}
     self.last_prices:int = 0
-    self.set_waypoint()
-    self.system = self.get_system()
   
-  def set_waypoint(self):
-    waypoint = self.store.get(Waypoint, self.symbol, create=True)
-    self.waypoint = waypoint
+  def get_waypoint(self):
+    return self.store.get('Waypoint', self.symbol, create=True)
   
   def is_fuel(self):
     return self.imports + self.exports + self.exchange == ['FUEL']
@@ -51,7 +48,7 @@ class Marketplace(Base):
         e = self.prices[symbol] = MarketEntry()
       buy = mg(g, 'purchasePrice')
       sell = mg(g, 'sellPrice')
-      volume = mg(g, 'tradeVolumes')
+      volume = mg(g, 'tradeVolume')
       supply = SUPPLY.index(mg(g, 'supply'))
       activity = ACTIVITY.index(sg(g, 'activity','STRONG'))
       e.add(buy, sell, volume, supply, activity)
@@ -68,12 +65,12 @@ class Marketplace(Base):
   def buy_price(self, resource):
     if resource not in self.prices:
       return None
-    return self.prices[resource]['buy']
+    return self.prices[resource].buy
   
   def volume(self, resource):
     if resource not in self.prices:
       return None
-    return self.prices[resource]['volume']
+    return self.prices[resource].volume
     
   def sellable_items(self, resources):
     return [r for r in resources if r in self.prices]
diff --git a/nullptr/models/survey.py b/nullptr/models/survey.py
index 4b248a5..77b7667 100644
--- a/nullptr/models/survey.py
+++ b/nullptr/models/survey.py
@@ -28,7 +28,7 @@ class Survey(Base):
   def api_dict(self):
     return {
       'signature': self.symbol,
-      'symbol': self.waypoint(),
+      'symbol': self.waypoint,
       'deposits': [{'symbol': d} for d in self.deposits],
       'expiration': self.expires_str,
       'size': size_names[self.size]
diff --git a/nullptr/models/waypoint.py b/nullptr/models/waypoint.py
index 041b218..d42bb10 100644
--- a/nullptr/models/waypoint.py
+++ b/nullptr/models/waypoint.py
@@ -12,7 +12,6 @@ class Waypoint(Base):
     self.traits:list = []
     self.faction:str = ''
     self.is_under_construction:bool = False
-    self.system = self.get_system()
     self.uncharted = True
 
     
@@ -24,6 +23,9 @@ class Waypoint(Base):
     self.seta('is_under_construction', d, 'isUnderConstruction')
     self.setlst('traits', d, 'traits', 'symbol')
     self.uncharted = 'UNCHARTED' in self.traits
+    
+  def created(self):
+    self.get_system()
   
   def distance(self, other):
     return int(sqrt((self.x - other.x) ** 2 + (self.y - other.y) ** 2))
diff --git a/nullptr/store.py b/nullptr/store.py
index 6a24fd2..d2dee16 100644
--- a/nullptr/store.py
+++ b/nullptr/store.py
@@ -72,6 +72,7 @@ class ChunkHeader:
 class Store:
   def __init__(self, data_file, verbose=False):
     self.init_models()
+    self.data_file = data_file
     self.data_dir = os.path.dirname(data_file)
     self.fil = open_file(data_file)
     self.data = {m: {} for m in self.models}
@@ -90,6 +91,9 @@ class Store:
       return
     print(m)
   
+  def f(self, detail):
+    return f'Store {self.data_file}'
+  
   def close(self):
     self.flush()
     self.fil.close()
@@ -112,6 +116,9 @@ class Store:
     buf = BytesIO(data)
     p = StoreUnpickler(buf, self)
     obj = p.load()
+    x = self.get(type(obj), obj.symbol)
+    if x is not None and x in self.dirty_objects:
+      self.dirty_objects.remove(obj)
     obj._file_offset = offset
     self.hold(obj)
     
@@ -138,6 +145,8 @@ class Store:
       offset = self.fil.tell()
       
     dur = time() - start_time
+    # just in case any temp objects were created
+    self.dirty_objects = set()
     self.p(f'Loaded {cnt} objects in {dur:.2f} seconds')
     self.p(f'Fragmented space: {free} / {total} bytes')
   
@@ -210,14 +219,15 @@ class Store:
     symbol = obj.symbol
     obj.store = self
     self.data[typ][symbol] = obj
-    if hasattr(obj, 'system'):
-      system_str = obj.get_system().symbol
+    if type(obj).__name__ in ['Waypoint','Marketplace', 'Jumpgate', 'Survey']:
+      system_str = obj.system.symbol
       if system_str not in self.system_members:
         self.system_members[system_str] = set()
       self.system_members[system_str].add(obj)
   
   def create(self, typ, symbol):
     obj = typ(symbol, self)
+    obj.created()
     self.hold(obj)
     self.dirty(obj)
     return obj