Annualised stdev of the trailing 21 session returns. COMPUTED BACKWARD, unlike UW's /volatility/realized which computes it FORWARD over ~20 sessions and is therefore not knowable on the date it is stamped with (DESIGN.md:139, the highest-priority provenance hazard in the document).
2026-09-212 obs2026-09-22
The cross-section of every symbol at 2026-09-22 was stopped by its statement timeout. The TSM figures above are unaffected.
