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…ng the API A timed-out SDK call leaves its worker thread inside the SDK, and the global lock then lets the next request call in beside it; each later hang leaks another thread until waitress's queue saturates and even /ping takes an hour (2026-08-23). - Instrument: live SDK worker count and oldest age on /ping; every TIMEOUT/WEDGED log line carries mode, path and worker count. - Single-flight guard: while a timed-out call is still inside the SDK, new calls raise MT5Wedged (503 + Retry-After) instead of starting a thread. restart_terminal's own reconnect is exempt. - Wedge watchdog thread in every mode: exit the process (code 75) once a worker has been stuck MT5_WEDGE_EXIT_SECONDS (180 s), deferring while a backtest holds RUN_LOCK, up to a 30 min ceiling. - restart_terminal skips mt5.shutdown while wedged. The relaunch loop that brings an exited process back is a local api_runner.bat hook applied by the backtester's deploy-mt5-scripts.sh.
config.yaml accounts can carry extra keys (the backtest manager's symbol_map); init_mt5(**account) raised TypeError on them, so every SDK route on such an account returned 500.
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Fixes #23.
MT5Wedged(503 +Retry-After) instead of spawning another thread;restart_terminal's own reconnect is exempt./pingreports the live SDK worker count and oldest age; every TIMEOUT/WEDGED line carries mode, path and worker count.MT5_WEDGE_EXIT_SECONDS(180 s), deferring while a backtest holdsRUN_LOCK, up to a 30 min ceiling.restart_terminalskipsmt5.shutdownwhile wedged.init_mt5— a config account carrying extra keys otherwiseTypeErrors and every SDK route on it returns 500.Tests:
tests/test_wedge_watchdog.py, plus addedtests/test_mt5client.pycases.