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Session Log — Thursday, April 16 2026

What We Worked On

  • NEO Trading Engine — full calculation audit of all engine, dashboard, and terminal metrics
  • NEO Trading Engine — Session 30 DB reconstruction after Cowork outage (terminal output lost)
  • NEO Trading Engine — FLAG-025 (orphaned fill fix) and FLAG-026 (Segment B isolation tooling) implementation by Orion
  • NEO Trading Engine — Atlas alignment on Session 30 results, audit findings, Q1–Q5, and Section 9
  • Team setup — onboarded Orion (Claude Opus, implementation agent), established two-session Cowork architecture

What Was Built or Changed

  • dashboard.py — 3 bugs fixed: Inv PnL scope mismatch, Session Spread DOM denominator, All-time Spread DOM denominator. UNCOMMITTED — Katja must push separately.
  • neo_engine/state_manager.py + main_loop.py — FLAG-025: orphaned fill reattribution on startup. Commit: a329561.
  • scripts/segment_b_summary.py — FLAG-026: standalone Segment B analysis script. Commit: 5df0dd9.
  • [C] NEO Operating Principles.md — new file, 11 sections, Section 9 (Full Reading Principle) added per Atlas.
  • [C] Dashboard Metrics Reference.md — new file, definitions and formulas for every dashboard metric, all bugs documented.
  • [C] Experiment Log.md — Session 30 updated: verdict changed from INCONCLUSIVE to Segment B PASS (+1.29 bps).
  • [C] Open Flags.md — FLAG-024, FLAG-025, FLAG-026 all marked RESOLVED.
  • CLAUDE.md — full team table added, Orion onboarded, Session 30 updated, Operating Standard section added.
  • Atlas alignment files (5 new): Session 30 + Audit, Section 9 + Q1-Q5, Orion Green Light + Multi-Agent Addendum, Team Complete + Orion Onboarded, FLAG-026 Coverage Extension.
  • scripts/segment_b_summary.py — FLAG-026 extension: Segment B coverage ratio + fills per minute added (+44 lines). Commit pushed.

Key Finding (pre-Session 31)

Session 30 Segment B fills/min (0.66) is lower than Segment A (0.97) despite Segment B VW being stronger (+1.29 bps). The spread improvement is a pricing effect, not a volume effect — confirmed before Session 31 runs. This answers Atlas's attribution question.

Session 31 — Late Night Events

Two failed starts before the real run: 1. Output redirect (> session31.log 2>&1) — engine was running, Katja saw no terminal output, stopped manually (~1 min). User error, no system issue. 2. QuikNode degraded — engine launched, RPC failed immediately, 7-minute stall, terminal force-closed → DB corruption (3 missing pages, fills.session_id index + valuation_snapshots damaged, 67 fills unrecoverable from live DB).

Recovery: Rolled back to Orion's clean snapshot (flag025_test.db @ 17:52 UTC). All 93 Session 30 fills preserved. Zero strategic data loss.

Session 31 now running — clean DB, manual RPC preflight 668ms, engine healthy. Running at wrap-up.

Still Open

  • Session 31 running — evaluate at close: Segment B VW ≳ 1.1 bps (primary), coverage ratio + fills/min (attribution), inventory stability during Segment B (Atlas watch item). Do NOT compare total duration metrics to prior runs — Segment B only.
  • FLAG-027: Orion implements after session closes — pre-run backup, blocking preflight, signal handlers (run_paper_session.py only). Include Atlas's logging lines (snapshot created, graceful shutdown, preflight failed).
  • FLAG-028 / dashboard.py bundle: Orion adds idx_fills_session_id index (state_manager.py). Katja's commit covers: cache all-time aggregates, read-only connection, Spread DOM guard fix, use_container_width cleanup.
  • dashboard.py FLAG-024 push: Still uncommitted on Katja's machine.
  • FLAG-008 (WAC rebuild) and FLAG-016 (test suite) still open.

Start Here Tomorrow

Session 31 results first — run Segment B analysis, evaluate all four metrics. Then Orion commits FLAG-027 + index. Katja pushes dashboard.py bundle. One PASS = size 15 unlocked.