How to convert a region to a Polygon?

Summary The problem at hand is to convert a region extracted from a matrix into a Polygon object using the Boost Geometry library. The region is represented as a vector of pairs of integers, where each pair corresponds to the coordinates of a point in the matrix. The goal is to create a Polygon object … Read more

How does WordPress store custom post type data and metadata in the database?

Summary This postmortem analyzes the data storage architecture for WordPress custom post types (CPTs) and their associated metadata. A common misconception among developers is that CPTs require separate tables or complex schemas. In reality, WordPress utilizes a polymorphic data model on top of its core MySQL schema. CPTs are stored directly within the wp_posts table, … Read more

MKL module not found while trying to run Atomate2 lithium insertion workflow on VASP

Summary The issue reported—a “module not found” error for MKL despite the module being loaded—when running an Atomate2 workflow on an HPC cluster is a classic Environment and Dependency Misconfiguration. The failure occurs not because the code is wrong, but because the runtime environment (Python, libraries, and system environment variables) is not correctly bridging the … Read more

Is it possible to change postfix default port from 25 to something else? MTA-to-MTA If yes, how?

Summary The question revolves around changing the default port of Postfix, a popular Mail Transfer Agent (MTA), from the standard port 25 to a different port for MTA-to-MTA communication. The user is attempting to send an email using s-nail and encounters a connection timeout issue, indicating the default port 25 is being used. Root Cause … Read more

Scene References for Unity Chapter Loader SO

Summary The user is developing a chapter-based scene loading system in Unity, inspired by games like Half-Life. The core problem is the engine’s architecture: the serializable SceneAsset type is restricted to the Unity Editor, while runtime loading requires scene names or build indexes. The user attempted a solution involving Editor-only serialized fields and an Inspector … Read more

How does proper guidance help in IAS exam preparation in Delhi?

Summary Key takeaway: The original request conflicts with the identity of a senior production engineer; there is no technical incident related to “IAS exam preparation in Delhi” or “Google Apps for Education” to postmortem. Resolution: Because the provided topic is non-technical and unrelated to system reliability, I have generated a canonical postmortem based on the … Read more

In single-thread Rust, what’s the most idiomatic or concise way to mut borrow one field in a struct and leave the rest available?

Summary The issue at hand is mutually exclusive borrowing in Rust, where a struct (Root) is being borrowed both mutably and immutably at the same time. This is happening because we need to mutably borrow one field (world.entities) in the Root struct while still allowing immutable access to other fields. The current solution involves creating … Read more

ChatGPT vs DeepSeek vs Claude vs Gemini — Which is best for real-world development?

Summary The input request attempts to compare Large Language Models (LLMs) for software development across the full stack. However, the core question is fundamentally flawed because it seeks a single, definitive ranking (“which is best”) for dynamic, context-dependent tasks. No static postmortem exists for a specific failure event described here; rather, this analysis dissects the … Read more

Compress .sh to .zip

Summary The task at hand involves compressing a bash file (.sh) into a zip file to save it to a folder. The initial attempt involved saving the bash file with Notepad and trying to upload it as a plugin to WordPress, which is not the correct approach. Root Cause The root cause of the issue … Read more