add transaction_cache_size to config

lbry/conf.py

@@ -636,6 +636,7 @@ class Config(CLIConfig):
         "Strategy to use when selecting UTXOs for a transaction",
         STRATEGIES, "standard")
 
+    transaction_cache_size = Integer("Transaction cache size", 100_000)
     save_resolved_claims = Toggle(
         "Save content claims to the database when they are resolved to keep file_list up to date, "
         "only disable this if file_x commands are not needed", True

lbry/wallet/ledger.py

@@ -158,7 +158,7 @@ class Ledger(metaclass=LedgerRegistry):
         self._on_ready_controller = StreamController()
         self.on_ready = self._on_ready_controller.stream
 
-        self._tx_cache = pylru.lrucache(100000)
+        self._tx_cache = pylru.lrucache(self.config.get("tx_cache_size", 100_000))
         self._update_tasks = TaskGroup()
         self._other_tasks = TaskGroup()  # that we dont need to start
         self._utxo_reservation_lock = asyncio.Lock()

lbry/wallet/manager.py

@@ -184,6 +184,7 @@ class WalletManager:
             'auto_connect': True,
             'default_servers': config.lbryum_servers,
             'data_path': config.wallet_dir,
+            'tx_cache_size': config.transaction_cache_size
         }
 
         wallets_directory = os.path.join(config.wallet_dir, 'wallets')