jonasvanderhaegen

Sourcing deep 1-minute futures history for backtesting: findings

Date: 2026-08-02. Context: an intraday futures strategy pipeline (CME micro contracts, 1m bars) needed more than the ~1 week of history its live feed retains, to enable out-of-sample backtesting. These are the measured findings and the sourcing decision.

TL;DR

1. The tastytrade/dxFeed dxLink candle service is capped at ~8000 events per snapshot subscription, and windowed re-requests do not reach past it. Effective free depth: about one week of 1m bars per symbol, regardless of how far back you ask.
2. Cross-instrument concatenation ("stitch 8 roots into one long series") is tempting and wrong: it manufactures bar count, not information. Ratio-adjusted stitching is only legitimate within one root across contract rolls.
3. For real depth, Databento's GLBX.MDP3 (official CME distributor) is the standout: 16+ years, all four CME exchanges, OHLCV-1m is the cheap schema, and the $125 new-account credit likely covers a multi-root multi-year pur

jonasvanderhaegen

ISO compliance for Laravel applications: the engineer's field guide

A file per standard, mapping every control theme that has an application layer to concrete Laravel implementations: packages, config, code patterns, tests, and the evidence an auditor or enterprise security questionnaire actually asks for.

File	Standard	One-liner
1-iso-27001-laravel.md	ISO/IEC 27001:2022	Information security management; the Annex A control-by-control Laravel mapping
2-iso-27701-privacy-laravel.md	ISO/IEC 27701:2025	Privacy information management, standalone since the 2025 revision; DSAR, retention, PII engineering
3-iso-42001-ai-laravel.md	ISO/IEC 42001:2023	AI management systems; what to build when your Laravel app ships AI features
4-other-iso-eu-laws-laravel.md	27017, 27018, 22301, 9001, 20000-1 + GDPR, CRA, NIS2, AI Act	What to skip, what is law rather than certificate

jonasvanderhaegen

R2 + local cache health checklist (sky orgs joint doctrine, reconstructed 2026-08-01)

R2 + local cache health checklist (sky orgs joint doctrine)

Ratified 2026-07-10 by both sky orgs. This document was RECONSTRUCTED on 2026-08-01 after the original gist 404'd: the item list below is the ratified scope recorded verbatim in the binary-lsp-php-server CLAUDE.md; the commands and thresholds were re-derived from the repos' release tooling (ship.sh both repos, release-preflight.sh) and validated end-to-end during the acuity 0.1.44 + skyline 1.2.3 release of 2026-08-01. Items whose original

jonasvanderhaegen

How to benchmark an MCP tool server against Claude Code's built-in tools — honestly

A reproducible recipe. The worked example compares skyline (a content-hash-guarded editing/search MCP server) against Claude Code's own Read/Grep/Glob/Edit/Bash, but nothing here is skyline-specific — swap in any MCP server.

Everything below was executed, not sketched. Where I got something wrong first, the wrong version is included, because the failure modes are the useful part.