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Rudy Osuna 261366a7e2
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Add VIX Mini Futures (VXM) Support (#9400)
* Add VIX Mini Futures (VXM) support

Adds complete LEAN support for VIX Mini Futures (VXM) traded on CBOE:
- Add Futures.Indices.VIXMini = "VXM" constant
- Add expiry function: 30 days before third Friday of following month
- Add symbol properties: multiplier 100, tick 0.01 (USD)
- Add 15 test date pairs for 2023-2025 to FuturesExpiryFunctionsTestData.xml
- Add [TestCase(VIXMini, EightOClockChicagoTime)] to IndicesExpiryDateFunction test
- Add market hours configuration mirroring VX trading hours

Closes QuantConnect/Lean#6655

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

* Fix VXM expiry holiday validation and add margin file

- Replace single `if` holiday check with `while` loop using
  `IsCommonBusinessDay()` to ensure the computed expiry date
  is always a valid tradable day (not just one step back)
- Fix test data: 2025-03-19 -> 2025-03-18 (April 18 2025 is
  Good Friday, a CFE holiday, shifting the expiry back)
- Add Data/future/cfe/margins/VXM.csv margin file

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Haiku 4.5 <noreply@anthropic.com>
2026-05-22 10:10:17 -03:00
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