Summary A missing removal workflow in the checkout logic caused the system to accept a “remove” command but never actually delete an item from the cart. The UI exposed the option, but the backend never implemented the behavior, leading to user confusion and inconsistent cart state. Root Cause The root cause was a combination of … Read more
Summary This postmortem analyzes a warehouse data-processing failure where a FIFO (First‑In, First‑Out) matching algorithm between ship_in_df and ship_out_df produced incorrect or incomplete results. The issue stemmed from an overly simplistic join strategy that ignored inventory depletion order, leading to mismatched cost attribution and inconsistent outbound records. Root Cause The system attempted to match outbound … Read more
Summary A simulation model in AnyLogic encountered issues with worker assignment and tracking box data in a racking system. Workers needed to be restricted to specific aisles, and box data (weight, volume, and ID) required tracking after storage. Root Cause Worker Assignment: Workers were not properly assigned to specific aisles, leading to inefficiencies. Data Tracking: … Read more
Summary This incident involved Xcode Cloud builds failing with Ad‑hoc and Developer Distribution errors (Error code 70) when attempting to upload an iOS app to App Store Connect. The local build and simulator runs succeeded, but the cloud pipeline consistently rejected the archive due to misaligned signing assets and incorrect distribution configuration. Root Cause The … Read more
Summary This postmortem examines a common migration pitfall: moving from the Met Office’s legacy DataPoint API to the newer DataHub API and expecting identical data structures. The issue arises when teams assume that symbolic weather codes, descriptive strings, or visibility categories will be preserved across API generations. They are not — and this mismatch leads … Read more
Summary Adding authentication to an existing ASP.NET Core MVC application requires specific NuGet packages, .NET CLI commands, and configuration steps. This postmortem outlines the process, root causes of common issues, and best practices for implementation. Root Cause The primary issue arises from missing dependencies and incomplete configuration when integrating ASP.NET Core Identity into an existing … Read more
Summary Choosing the right domain name is critical for building credibility and personal branding. The decision to switch from .site to .com and potentially change from “Holo Integrated Ops” to “Holo Olagoke” requires careful consideration to avoid losing established credibility. Root Cause Lack of clarity on the purpose of the domain name (personal branding vs. … Read more
Summary A protected‑mode jump to a kernel loaded at 0x00010000 failed silently, leaving VirtualBox on a black screen. The root cause was a combination of incorrect segment usage, invalid far jumps, and loading the kernel to the wrong physical address relative to the GDT and protected‑mode setup. Root Cause The failure came from several interacting … Read more
Summary This incident stemmed from a partially implemented message‑sending flow in a Firebase‑based chat application. The system entered an inconsistent UI/auth state because the sendMessage() logic was cut off mid‑implementation, causing runtime failures and preventing messages from being sent. Root Cause The root cause was incomplete control‑flow logic inside the sendMessage() function. The code ends … Read more
Summary The AliExpress Dropshipping API integration in a NestJS application consistently failed with an IncompleteSignature error during token exchange. The issue stemmed from incorrect signature generation due to misinterpretation of the AliExpress signature algorithm and missing URL encoding for specific parameters. Root Cause Incorrect Signature Construction: The signature string included parameter keys and values without … Read more