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Imagine paying for a meal but never seeing the

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confirmation page Would you immediately pay again A missing

3
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response from a trading system likewise does not establish

4
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rejection repetition can duplicate exposure This lesson concerns

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isolated demo controls We do not alter live accounts

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or positions belonging to another program The objective is

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to specify behavior under uncertainty not experiment dangerously

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with customer funds or assume that communication will always

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remain reliable

10
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A virtual server reduces dependence on a laptop it

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cannot guarantee logic data or execution Record the latest

12
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valid quote time connection build and configuration Distinguish

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system broker and timezone references The server was running

14
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does not explain an order a decision log does

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Stale data and invalid communication need predefined handling Incomplete

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input must not be treated as valid simply because

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the process is alive and a dashboard looks healthy

18
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Give every submission intent a durable identity to recognize

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repeated events Separate pending response open exposure unknown

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result and halted state On restart recover saved state

21
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and reconcile server orders Clearing memory does not solve

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the risk it destroys recovery evidence Until the result

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is known restrict new entries and repeated requests according

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to the safe policy A successful function return is

25
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not always equivalent to a completed trade so inspect

26
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the relevant server results and events

27
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Blocking entries differs from closing all positions In our

28
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teaching model entry is disabled while existing exposure follows

29
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a separate management policy Forced closure has its own

30
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costs and risks Do not touch unrelated positions During

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disconnection a local switch cannot guarantee delivery of an

32
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instruction to the broker A server-side stop cannot guarantee

33
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an exact fill either A button name is insufficient

34
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behavior scope and restart conditions must be explicit and

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testable

36
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Rehearse stale quotes duplicate events communication loss after

37
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submission and restart with open exposure Write expected behavior

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first Reject entry on stale data and reconcile unknown

39
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results before retrying Numerical thresholds belong to the actual

40
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system specification do not treat a teaching number as

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suitable for every instrument The test should be repeatable

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and isolated so it cannot affect unrelated programs or

43
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exposure beyond the declared control scope

44
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Retain the build input expectation actual result and error

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Printing success is insufficient inspect order counts and state

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transitions Simulation tests logic not live execution quality Logged

47
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demo observation is still needed Several profitable days cannot

48
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replace reconnection and recovery drills Each risk needs appropriate

49
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evidence Every test should clearly state what it established

50
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and what remains unknown rather than turning one successful

51
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check into a claim of complete safety

52
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Complete the four-failure table with pass and fail conditions

53
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Why not immediately repeat a request after losing the

54
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response The original may already be accepted Reconcile first

55
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then decide For restart specify what must be recovered

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from storage and the server Next we convert these

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controls into an evidence checklist for evaluating an EA

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before purchase Reducing ambiguity is the goal removing every

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operational and market risk is not a promise this

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lesson can make