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# DECISIONS.md — dated design and engineering decisions (WP39)

ID Date (ET) Decision Reason Consequence
D-001 2026-11-02 13:00 Compute on M3U96a (FinData host) with a dedicated least-privilege key wp39_uqo; repository lives in the UQO Research workspace (Recherche-UQO/finance/invisible-balance-sheet, dir name follows the series convention; project id wp39_uqo) and is rsync'd to M3U96a:~/wp39_uqo for runs API on localhost, lake co-located, 28 cores / 96 GB; secrets never leave ~/findata-secrets / ~/Desktop/Cluster/secrets results and manifests synced back; raw cache stays on the node
D-002 2026-11-02 13:05 Earnings release dates (earnings_events.event_date) define the reveal date A_q; the filing date F_q defines structured-fact availability (available_at = F_q + 1) press releases precede 10-Q filings by a median of 1 day; cutoffs must precede the first public reveal cutoff rule c < min(A_q, F_q); release rows read from Postgres (no API route) — documented exception
D-003 2026-11-02 13:10 Daily bars are rebuilt from the 1-minute raw export (regular session), not taken from market_bars.stock.1d.raw vendor 1d dataset covers about half the symbols before 2016 and no delisted names one source, one adjustment path for all four frequencies
D-004 2026-11-02 13:30 Streaming feature extraction (export → features → delete raw Parquet; manifest keeps SHA-256) disk budget on the FinData host (hard floor 60 GB free) re-runs re-export from the pinned dataset version
D-005 2026-11-02 14:00 Universe = all FinData fundamentals entities (survivor-conditioned); delisted-fundamentals backfill proposed, not run vendor ingestion covered active tickers only; backfill needs owner approval + capacity plan (rule 3 of the brief) survivorship caveat stated in abstract, data section, limitations; price side is survivorship-free
D-006 2026-11-02 14:05 No neural (B7) nor text/multimodal (B8) models; no LLM anywhere in the pipeline owner instruction received mid-session on 2026-11-02 ("limite le plus possible l'utilisation AI"); also keeps the frequency comparison about information sets rather than capacity ladder is B0–B6; LightGBM provides the nonlinear benchmark with equal budgets
D-007 2026-11-02 14:10 Primary target = adverse operating-income surprise vs a seasonal random walk with drift, scaled by total assets, threshold −0.5 % no point-in-time consensus exists in FinData; operating income is less affected by one-off items than net income; Foster (1977) model is the classic honest expectation consensus-based miss (vendor eps_estimate) is exploratory only
D-008 2026-11-02 14:15 Frequency sets B3/B4/B5 use identical feature families (one column per family) computed from bars of 30 m / 5 m / 1 m compare information sets, not dimensionality a supplementary "all frequencies" model is run in Phase 4
D-009 2026-11-02 14:20 Literature verified with Crossref metadata (no AI summarisation); references without a verifiable DOI are cited without one (Grossman–Stiglitz 1980, Holm 1979) rule 7 of the brief (no fabricated references) artifacts/logs/crossref_batch*.json are the evidence
D-010 2026-11-02 14:30 Phase gates that require "owner approval" are recorded as self-approved under the autonomous mandate with the memo attached; the owner can veto any of them before Phase 6 the owner asked for the whole project to be built in one autonomous session and is not available mid-task each gate entry in PROGRESS.md names the memo and the date
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