Fix multi-account positioning and order tracking..

This seems to have been broken in refactoring from commit 279c899de5
which was never tested against multiple accounts/clients.

The fix is 2 part:
- position tables are now correctly loaded ahead of time and used by
  account for each connected client in processing of ledgers and
  existing positions.
- a task for each API client is started (as implemented prior) so that
  we actually get status updates for every client used for submissions.

Further we add a bit of code using `bisect.insort()` to normalize
ledgers to a datetime sorted list records (though pretty sure the `dict`
transform ruins it?) in an effort to avoid issues with ledger
transaction processing with previously minimized `Position.clears`
tables, which should (but might not?) avoid incorporating clear events
prior to the last "net-zero" positioning state.

piker/brokers/ib/broker.py

@@ -18,6 +18,7 @@ Order and trades endpoints for use with ``piker``'s EMS.
 
 """
 from __future__ import annotations
+from bisect import insort
 from contextlib import ExitStack
 from dataclasses import asdict
 from functools import partial
@@ -435,7 +436,6 @@ async def trades_dialogue(
     # deliver positions to subscriber before anything else
     all_positions = []
     accounts = set()
-    clients: list[tuple[Client, trio.MemoryReceiveChannel]] = []
     acctids = set()
     cids2pps: dict[str, BrokerdPosition] = {}
 
@@ -486,7 +486,6 @@ async def trades_dialogue(
                 # the so called (bs) "FIFO" style which more or less results in
                 # a price that's not useful for traders who want to not lose
                 # money.. xb
-                # for client in aioclients.values():
                 for pos in client.positions():
 
                     # collect all ib-pp reported positions so that we can be
@@ -500,7 +499,9 @@ async def trades_dialogue(
                     assert msg.account in accounts, (
                         f'Position for unknown account: {msg.account}')
 
+                    ledger = ledgers[acctid]
                     table = tables[acctid]
+
                     pp = table.pps.get(bsuid)
                     if (
                         not pp
@@ -596,6 +597,7 @@ async def trades_dialogue(
 
             # proxy wrapper for starting trade event stream
             async def open_trade_event_stream(
+                client: Client,
                 task_status: TaskStatus[
                     trio.abc.ReceiveChannel
                 ] = trio.TASK_STATUS_IGNORED,
@@ -613,18 +615,25 @@ async def trades_dialogue(
                 ctx.open_stream() as ems_stream,
                 trio.open_nursery() as n,
             ):
-                trade_event_stream = await n.start(open_trade_event_stream)
-                clients.append((client, trade_event_stream))
 
-                # start order request handler **before** local trades
-                # event loop
-                n.start_soon(handle_order_requests, ems_stream, accounts_def)
+                for client in aioclients.values():
+                    trade_event_stream = await n.start(
+                        open_trade_event_stream,
+                        client,
+                    )
 
-                # allocate event relay tasks for each client connection
-                for client, stream in clients:
+                    # start order request handler **before** local trades
+                    # event loop
+                    n.start_soon(
+                        handle_order_requests,
+                        ems_stream,
+                        accounts_def,
+                    )
+
+                    # allocate event relay tasks for each client connection
                     n.start_soon(
                         deliver_trade_events,
-                        stream,
+                        trade_event_stream,
                         ems_stream,
                         accounts_def,
                         cids2pps,
@@ -968,7 +977,7 @@ def norm_trade_records(
     ledger into our standard record format.
 
     '''
-    records: dict[str, Transaction] = {}
+    records: list[Transaction] = []
     for tid, record in ledger.items():
 
         conid = record.get('conId') or record['conid']
@@ -1047,19 +1056,22 @@ def norm_trade_records(
         #   should already have entries if the pps are still open, in
         #   which case, we can pull the fqsn from that table (see
         #   `trades_dialogue()` above).
-
-        records[tid] = Transaction(
-            fqsn=fqsn,
-            tid=tid,
-            size=size,
-            price=price,
-            cost=comms,
-            dt=dt,
-            expiry=expiry,
-            bsuid=conid,
+        insort(
+            records,
+            Transaction(
+                fqsn=fqsn,
+                tid=tid,
+                size=size,
+                price=price,
+                cost=comms,
+                dt=dt,
+                expiry=expiry,
+                bsuid=conid,
+            ),
+            key=lambda t: t.dt
         )
 
-    return records
+    return {r.tid: r for r in records}
 
 
 def trades_to_ledger_entries(