Production Bugs

I am trying to exclude a file that has -PK in its name in the code below. Auto print from email. File name always is a pdf and has -PK in its name

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Summary An Outlook VBA script intended to auto-print email attachments failed to exclude files containing -PK in their names. The issue arose because the script lacked a filename validation check, causing all matching file types (e.g., .pdf) to be printed regardless of their name. Root Cause The script did not include logic to filter filenames … Read more

Selecting a row with alternatives in R

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Summary Issue: Duplicated lab results for subjects with both hb and hb_urg entries in the dataset. Goal: Retain only hb_urg for subjects with both results, while keeping single entries as-is. Root Cause Duplicate entries for subjects with both hb and hb_urg lab results. Lack of filtering logic to prioritize hb_urg over hb when both exist. … Read more

Appsync Graphql Subscription problem with IAM Authentication

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Summary The issue at hand is an Appsync GraphQL Subscription problem with IAM Authentication. The connection to Appsync is established correctly, but when attempting to subscribe, an error occurs due to a mismatch in the request signature. This is a critical issue as it prevents the application from receiving real-time updates. Root Cause The root … Read more

How to work around Pydantic’s lack of high-level support for Unpack tuples?

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Summary A subtle limitation in Pydantic’s high‑level API prevented a RootModel from cleanly representing a variadic tuple shaped like (ClrMamePro, Game, Game, …). Although pydantic‑core can validate such structures, Pydantic’s schema generation pipeline doesn’t fully support them, leading to the “class not fully defined” error when attempting to override __get_pydantic_core_schema__. Root Cause The failure stems … Read more

Expecting multiple calls using await to a function that returns a promise to behave synchronously but it doesn’t

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Summary This incident stems from a common misunderstanding of how async functions behave inside array iteration methods. The engineer expected await inside forEach to serialize asynchronous calls, but forEach does not await anything. As a result, all asynchronous operations fired concurrently, producing unexpected log ordering. Root Cause The root cause is using await inside Array.forEach, … Read more

How to apply various language stemmers to same input tokens in parallel instead linearly?

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Summary This incident examines a common misconception when implementing multilingual stemming in Apache Solr: attempting to run multiple language stemmers in parallel on the same token stream. Because Solr analyzers operate strictly sequentially, this approach produces incorrect stems and degraded search quality. The correct architectural pattern is to use separate language‑specific fields or language detection … Read more

DotNetPublish targeting multiple framework

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Summary This incident centers on a multi‑target .NET project where a custom build script uses DotNetPublish to generate framework‑specific outputs and then produce a NuGet package. After adding net10.0 to the project’s TargetFrameworks, the build no longer produced a NuGet package. The root cause was a misunderstanding of how NuGet packing works in multi‑target projects … Read more

How to securly store arbitrary data in TPM?

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Summary A Windows TPM cannot directly store arbitrary data. The only safe and architecturally correct pattern is to seal (encrypt) your data using a TPM‑protected key and store the encrypted blob outside the TPM. Properties attached to NCrypt keys do not live inside the TPM; they live in the Windows Key Storage Provider (KSP) on … Read more

Get current context from within node deserializer

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Summary A deserializer failed to access property-level context during YAML parsing, preventing it from detecting whether a target property had a required attribute. The serializer path exposed IPropertyDescriptor, but the deserializer path did not, causing asymmetric behavior and unexpected type‑conversion failures. Root Cause The underlying issue was that YamlDotNet’s deserialization pipeline does not surface property … Read more