Add TaskScheduler, PDT gate, and task classes#54
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- TradeTask ABC with should_execute() (Strategy pattern) - ScheduledTask: executes on/after execute_date - DeferredTask: PDT-blocked, retried next trading day - Executor: gates submissions through PDTGate, owns deferred queue - drain_deferred() called at top of each run_once() cycle - Fix datetime serialization crash in blob_logger
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Summary
TradeTaskABC +ScheduledTask/DeferredTask(Command + Strategy pattern)Executorgates every submission throughPDTGate; PDT-blocked orders go into an in-memory deferred queue and are retried the next trading daydrain_deferred()called at top of eachrun_once()cycledatetimeserialization crash inblob_loggerScope
Only touches
trading_system/execution/(2 new files), 3 lines inmain.py, and the serialization bug fix.Test plan
pytest tests/— no regressions vs origin/main (7 pre-existing failures unchanged)state_logs/