Replace `Transaction.fqsn` -> `.fqme`

Change over all client (broker) code which constructs transactions
and finally wipe required `.fqsn` usage from `.accounting` B)

piker/accounting/_ledger.py

@@ -54,8 +54,8 @@ class Transaction(Struct, frozen=True):
 
     # TODO: unify this with the `MktPair`,
     # once we have that as a required field,
-    # we don't really need the fqsn any more..
+    # we don't really need the fqme any more..
-    fqsn: str
+    fqme: str
 
     tid: Union[str, int]  # unique transaction id
     size: float
@@ -68,11 +68,6 @@ class Transaction(Struct, frozen=True):
     # via the `MktPair`?
     expiry: datetime | None = None
 
-    # remap for back-compat
-    @property
-    def fqme(self) -> str:
-        return self.fqsn
-
     # TODO: drop the Symbol type, construct using
     # t.sys (the transaction system)
 
@@ -174,7 +169,7 @@ class TransactionLedger(UserDict):
                 continue
 
             tx = Transaction(
-                fqsn=fqme,
+                fqme=fqme,
                 tid=txdict['tid'],
                 dt=dt,
                 price=txdict['price'],

piker/accounting/_pos.py

@@ -900,7 +900,7 @@ def open_pps(
             clears_table['dt'] = dt
 
             trans.append(Transaction(
-                fqsn=bs_mktid,
+                fqme=bs_mktid,
                 sym=mkt,
                 bs_mktid=bs_mktid,
                 tid=tid,

piker/brokers/ib/broker.py

@@ -1266,7 +1266,7 @@ def norm_trade_records(
         insort(
             records,
             Transaction(
-                fqsn=fqme,
+                fqme=fqme,
                 sym=pair,
                 tid=tid,
                 size=size,

piker/brokers/kraken/api.py

@@ -401,7 +401,7 @@ class Client:
             fqme = asset_key + '.kraken'
 
             tx = Transaction(
-                fqsn=fqme,
+                fqme=fqme,
                 sym=asset,
                 tid=entry['txid'],
                 dt=pendulum.from_timestamp(entry['time']),

piker/brokers/kraken/broker.py

@@ -895,7 +895,7 @@ async def handle_order_updates(
                             ids.inverse.get(reqid) is None
                         ):
                             # parse out existing live order
-                            fqsn = pair.replace('/', '').lower()
+                            fqme = pair.replace('/', '').lower()
                             price = float(price)
                             size = float(vol)
 
@@ -922,7 +922,7 @@ async def handle_order_updates(
                                     action=action,
                                     exec_mode='live',
                                     oid=oid,
-                                    symbol=fqsn,
+                                    symbol=fqme,
                                     account=acc_name,
                                     price=price,
                                     size=size,
@@ -1207,7 +1207,7 @@ async def norm_trade_records(
         mkt: MktPair = (await get_mkt_info(fqme))[0]
 
         records[tid] = Transaction(
-            fqsn=fqme,
+            fqme=fqme,
             sym=mkt,
             tid=tid,
             size=size,

piker/clearing/_paper_engine.py

@@ -263,7 +263,7 @@ class PaperBoi(Struct):
         # other then this thing, our fqme address.
         bs_mktid: str = fqme
         t = Transaction(
-            fqsn=fqme,
+            fqme=fqme,
             sym=self._mkts[fqme],
             tid=oid,
             size=size,
@@ -577,9 +577,9 @@ async def trades_dialogue(
             mkt_by_fqme[fqme] = mkt
 
         # for each sym in the ledger load it's `MktPair` info
-        for tid, tdict in ledger.data.items():
+        for tid, txdict in ledger.data.items():
             # TODO: switch this to fqme
-            l_fqme = tdict['fqsn']
+            l_fqme = txdict.get('fqme', txdict['fqsn'])
 
             if (
                 gmi