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Please, someone help me to calculate Potential Evapotranspiration (PET) using raster temperature?

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Summary This postmortem analyzes a failure that occurred when attempting to compute Potential Evapotranspiration (PET) using the Thornthwaite method in R. The issue stemmed from incorrectly deriving per‑pixel latitude from a raster stack, leading to invalid PET outputs and runtime errors. Root Cause The root cause was the misuse of: yFromCell(Temperature_stack, 1:nrow(Temperature_stack)) This call returns … Read more

How to specify which granular token to use when publishing the npm package such as avoid to be prompted for authentication?

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Summary The issue at hand is how to specify a granular npm token when publishing an npm package to avoid being prompted for authentication. This is particularly important for CI/CD tools where automated publication is required without any user interaction. Root Cause The root cause of this issue is the lack of understanding of how … Read more

Is YouTube Data API v3 channel ID unique?

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Summary YouTube Data API v3 channel IDs are unique, permanent, and non-reusable, making them suitable as primary keys in database designs. However, edge cases exist, and understanding their behavior is critical for data integrity. Root Cause The question stems from uncertainty about YouTube’s channel ID management. Key concerns include: Uniqueness: Can duplicates occur? Immutability: Can … Read more

Trying to add class to a div on scroll but nothing happens

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Summary This incident involved a scroll‑triggered class toggle that never fired, preventing a full‑screen hero image from transitioning into a smaller, side‑aligned layout. The failure stemmed from missing JavaScript event handling, incorrect element positioning, and CSS rules that prevented the intended transformation from ever being observable. Root Cause The root cause was that no functional … Read more

Multi-Tenant application with Postgres row level security using NestJs and TypeOrm

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Summary This incident analyzes a misinterpretation of how multi‑tenant Postgres RLS and connection management work in a NestJS + TypeORM SaaS architecture. The core confusion: believing that each user session requires its own database connection, leading to fears of millions of connections. The real issue is not RLS itself, but incorrect scoping of the Postgres … Read more

KendoReact Data Grid Odata Bearer Token

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Summary The KendoReact Data Grid integration with OData APIs failed due to an inability to pass Bearer token authentication headers using the useODataDataSource hook. The issue stemmed from incorrect documentation and misuse of the transport configuration object. Root Cause Incorrect Documentation: The official KendoReact docs lacked clear guidance on passing custom headers for OData requests. … Read more

Unity Android Build Crashes at Startup with a Weird Crash Report on Logcat [ 6.2 ]

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Summary This incident involved a Unity Android build crashing immediately after the splash screen on subsequent launches. The crash only resolved temporarily when the app cache was cleared, and on some devices it never recovered. The logcat trace pointed directly into Mono’s Boehm garbage collector (libmonobdwgc-2.0.so), indicating a memory corruption or invalid GC state triggered … Read more

invalid_grant error while making oidc token api call

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Summary A request to the /a/consumer/api/v0/oidc/token endpoint failed with an invalid_grant error. This indicates that the authorization code exchange was rejected by the OpenID Connect provider because one or more parameters in the token request were invalid, expired, mismatched, or previously used. Root Cause The invalid_grant error almost always means the OIDC provider refused the … Read more

When is it appropriate to use the “Async” suffix when naming a function? Yield, or non-blocking, or both?

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Summary This postmortem analyzes a common API‑design failure: misusing the “Async” suffix when naming functions. The confusion stems from mixing up asynchronous execution, non‑blocking behavior, and coroutines that yield. When these concepts are blurred, developers ship APIs that mislead callers, cause misuse, and create long‑term maintenance pain. Root Cause The core issue is treating “Async” … Read more

I have an error with localhost about “DB_NAME”

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Summary A misconfigured WordPress installation on XAMPP triggered a PHP fatal error: the constant DB_NAME was not recognized. This happened because the wp-config.php file used invalid quotation marks, causing PHP to interpret the constant name as a malformed string rather than a defined identifier. Root Cause The define() statement used typographic (curly) quotes instead of … Read more