`accouning.calc`: enable crash handlers on `debug_mode` input (via test harness)

piker/accounting/calc.py

@@ -32,6 +32,7 @@ from typing import (
     TYPE_CHECKING,
 )
 
+from tractor.devx import maybe_open_crash_handler
 import polars as pl
 from pendulum import (
     DateTime,
@@ -396,6 +397,7 @@ def open_ledger_dfs(
     acctname: str,
 
     ledger: TransactionLedger | None = None,
+    debug_mode: bool = False,
 
     **kwargs,
 
@@ -410,8 +412,7 @@ def open_ledger_dfs(
     can update the ledger on exit.
 
     '''
-    from piker.toolz import open_crash_handler
-    with open_crash_handler():
+    with maybe_open_crash_handler(pdb=debug_mode):
         if not ledger:
             import time
             from ._ledger import open_trade_ledger