wallet: follow-up prev

electrum/address_synchronizer.py

@@ -39,6 +39,7 @@ from .logging import Logger
 
 if TYPE_CHECKING:
     from .network import Network
+    from .json_db import JsonDB
 
 
 TX_HEIGHT_LOCAL = -2
@@ -59,7 +60,7 @@ class AddressSynchronizer(Logger):
     inherited by wallet
     """
 
-    def __init__(self, db):
+    def __init__(self, db: JsonDB):
         self.db = db
         self.network = None  # type: Network
         Logger.__init__(self)

electrum/wallet.py

@@ -243,6 +243,10 @@ class Abstract_Wallet(AddressSynchronizer):
         super().set_up_to_date(b)
         if b: self.storage.write()
 
+    def clear_history(self):
+        super().clear_history()
+        self.storage.write()
+
     def load_and_cleanup(self):
         self.load_keystore()
         self.test_addresses_sanity()