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Sunday, 18 October 2026 Reading Room

Tech

LYM: A Python CLI Tool for Analyzing Trading Strategies from Excel

I built LYM to solve a simple problem: I had Excel files full of trading results, but no quick way to see which strategy was actually working. So I wrote a Python CLI tool that reads the file and generates a clean report. What it does: LYM analyzes trading strategies from Excel files. It calculates win rates, reward distribution, optimal take-profit (TP) levels, and consecutive win/loss streaks —…

dev.to ·

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It Used to Be Someone Else's Problem

My laptop kept running out of memory, and my first instinct was to blame the laptop: not enough RAM, something wrong with the machine. The failure didn't help.

  • Laptop's memory issue stemmed from test runners, Jest and Vitest
  • Default worker pool size equal to CPU cores minus one
  • Each worker is separate Node process with its own memory limits

·dev.to

Your Benchmark Passed. What Didn't It Test?

The dashboard is green, and the release decision moves closer. The agent passed the checks in front of it. That matters. But as the score becomes a release argument, I want to know what the checks…

  • Green dashboard indicates release decision moving forward
  • Passing score doesn't guarantee agent's behavior in all scenarios
  • Benchmark may overlook critical aspects like authority, context, or permissions

·dev.to

Case Study: Zero-Downtime Database Topology Migration

Client Profile: A growth-stage, multi-tenant SaaS platform scaling past its original database design assumptions. Summary: A sharding migration cancelled hours before execution, then completed with…

  • Multi-tenant SaaS platform faced query latency issues due to outgrown database design.
  • Migration cancelled due to unanticipated state-transition failure mode in script.
  • Revised topology achieved zero-downtime migration with improved runtime metrics.

·dev.to

Hands-On with the New Amazon CloudFront Support for AWS Lambda Web Functions

On October 12, 2026, Amazon Web Services introduced support for using AWS Lambda Web Functions as origins for Amazon CloudFront .

  • Lambda Web Functions can serve as CloudFront origins without code changes.
  • CloudFront Origin Access Control restricts Lambda Web Function access.
  • Direct Lambda access returns 403, CloudFront access returns 200.

·dev.to

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