Fix Kraken nonce recovery and Coinbase balance fallback in trading loop

[Copilot]

run_broker_trading_loop() had two silent failure paths: Coinbase balance checks bypassed the zero-balance retry logic, and Kraken nonce errors were counted as broker failures (accelerating dead-broker marking) instead of being recovered transparently.

Changes

• Balance fallback (run_broker_trading_loop): Replace direct broker.get_account_balance() with self._get_broker_balance(broker, broker_type, broker_name), routing Coinbase through _retry_coinbase_balance_if_zero() to handle stale API-cached $0 responses post-connect.

• Nonce error recovery (run_broker_trading_loop): Before the standard failure path, detect Kraken nonce errors and recover without incrementing the failure counter:

  if "nonce" in _err_lower and broker_name == "kraken" and jump_global_kraken_nonce_forward is not None:
      jump_global_kraken_nonce_forward(60_000)  # jump 60 s forward
      stop_flag.wait(5)
      continue  # retry immediately, no failure recorded

• Import: Added graceful import of jump_global_kraken_nonce_forward from global_kraken_nonce (falls back to None if unavailable, recovery path is skipped safely).

[railway-app]

🚅 Deployed to the Nija-pr-1090 environment in patient-compassion

Service	Status	Web	Updated (UTC)
Nija	✅ Success (View Logs)		Mar 31, 2026 at 6:19 am