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 Hiding the Y-axis zero-scale split line in ECharts while retaining other split lines requires customizing the axis label and split line configurations. The issue arises when the zero line is automatically generated, even if it falls outside the desired range. Root Cause Automatic Split Line Generation: ECharts generates split lines based on the calculated … 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 Text parsing in PDFs often fails due to line-by-line extraction, which disrupts logical grouping of content. This issue arises when parsing libraries like PyMuPDF treat each line as a separate entity, ignoring contextual relationships between lines. Root Cause Line-by-line extraction: PDF parsers often process text line by line, ignoring paragraph or section boundaries. Lack … Read more
Summary Ambiguous column errors in SQL joins occur when multiple tables have columns with the same name, and the query does not specify which table the column belongs to. In this case, adding pagination (ORDER BY id and id > “abc123”) caused the query to fail because id was present in both T1 and T2. … 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 A timezone conversion bug caused scheduling errors when crossing day boundaries, resulting in incorrect execution dates. The issue occurred due to improper handling of date adjustments during timezone conversions, leading to either a one-day delay or repetition of the same day. Root Cause Incorrect date handling: The conversion logic failed to account for day … 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