Don't override `Account.pps: dict` entries..

Despite a `.bs_mktid` ideally being a bijection with `MktPair.fqme`
values, apparently some backends (cough IB) will switch the .<venue>`
part in txn records resulting in multiple account-conf-file sections for
the same dst asset. Obviously that means we can't allocate new
`Position` entries keyed by that `bs_mktid`, instead be sure to **update
them instead**!

Deats,
- add case logic to avoid pp overwrites using a `pp_objs.get()` check.
- warn on duplicated pos entries whenever the current account-file
  entry's `mkt` doesn't match the pre-existing position's.
- mk `Position.add_clear()` return a `bool` indicating if the record was
  newly added, warn when it was already existing/added prior.

Also,
- drop the already deprecated `open_pps()`, also from sub-pkg exports.
- draft TODO for `Position.summary()` idea as a replacement for
  `BrokerdPosition`-msgs.

piker/accounting/__init__.py

@@ -33,7 +33,6 @@ from ._pos import (
     Account,
     load_account,
     load_account_from_ledger,
-    open_pps,
     open_account,
     Position,
 )
@@ -68,7 +67,6 @@ __all__ = [
     'load_account_from_ledger',
     'mk_allocator',
     'open_account',
-    'open_pps',
     'open_trade_ledger',
     'unpack_fqme',
     'DerivTypes',

piker/accounting/_pos.py

@@ -353,13 +353,12 @@ class Position(Struct):
     ) -> bool:
         '''
         Update clearing table by calculating the rolling ppu and
-        (accumulative) size in both the clears entry and local
-        attrs state.
+        (accumulative) size in both the clears entry and local attrs
+        state.
 
         Inserts are always done in datetime sorted order.
 
         '''
-        # added: bool = False
         tid: str = t.tid
         if tid in self._events:
             log.debug(
@@ -367,7 +366,7 @@ class Position(Struct):
                 f'\n'
                 f'{t}\n'
             )
-            # return added
+            return False
 
         # TODO: apparently this IS possible with a dict but not
         # common and probably not that beneficial unless we're also
@@ -448,6 +447,12 @@ class Position(Struct):
     # def suggest_split(self) -> float:
     #     ...
 
+    # ?TODO, for sending rendered state over the wire?
+    # def summary(self) -> PositionSummary:
+        # do minimal conversion to a subset of fields
+        # currently defined in `.clearing._messages.BrokerdPosition`
+
+
 
 class Account(Struct):
     '''
@@ -714,7 +719,7 @@ class Account(Struct):
         # XXX WTF: if we use a tomlkit.Integer here we get this
         # super weird --1 thing going on for cumsize!?1!
         # NOTE: the fix was to always float() the size value loaded
-        # in open_pps() below!
+        # in open_account() below!
         config.write(
             config=self.conf,
             path=self.conf_path,
@@ -898,7 +903,6 @@ def open_account(
             clears_table['dt'] = dt
             trans.append(Transaction(
                 fqme=bs_mktid,
-                # sym=mkt,
                 bs_mktid=bs_mktid,
                 tid=tid,
                 # XXX: not sure why sometimes these are loaded as
@@ -921,7 +925,18 @@ def open_account(
         ):
             expiry: pendulum.DateTime = pendulum.parse(expiry)
 
-        pp = pp_objs[bs_mktid] = Position(
+        # !XXX, should never be duplicates over
+        # a backend-(broker)-system's unique market-IDs!
+        if pos := pp_objs.get(bs_mktid):
+            if mkt != pos.mkt:
+                log.warning(
+                    f'Duplicated position but diff `MktPair.fqme` ??\n'
+                    f'bs_mktid: {bs_mktid!r}\n'
+                    f'pos.mkt: {pos.mkt}\n'
+                    f'mkt: {mkt}\n'
+                )
+        else:
+            pos = pp_objs[bs_mktid] = Position(
                 mkt,
                 split_ratio=split_ratio,
                 bs_mktid=bs_mktid,
@@ -933,8 +948,13 @@ def open_account(
         # state, since today's records may have already been
         # processed!
         for t in trans:
-            pp.add_clear(t)
-
+            added: bool = pos.add_clear(t)
+            if not added:
+                log.warning(
+                    f'Txn already recorded in pp ??\n'
+                    f'\n'
+                    f'{t}\n'
+                )
     try:
         yield acnt
     finally:
@@ -942,20 +962,6 @@ def open_account(
             acnt.write_config()
 
 
-# TODO: drop the old name and THIS!
-@cm
-def open_pps(
-    *args,
-    **kwargs,
-) -> Generator[Account, None, None]:
-    log.warning(
-        '`open_pps()` is now deprecated!\n'
-        'Please use `with open_account() as cnt:`'
-    )
-    with open_account(*args, **kwargs) as acnt:
-        yield acnt
-
-
 def load_account_from_ledger(
 
     brokername: str,