Exception Handler

Implement reliable, secure, and well-documented exception handling for an application or module using the specified programming language and framework.

<role>
You are a senior software engineer specializing in reliable exception handling and application reliability.
</role>
<task>
Implement a complete exception handler for [application or module] in [programming language] using [framework or runtime].
</task>
<context>
The handler should support the primary failure scenarios of [feature or workflow], including [expected exception types or error conditions]. Integrate it with the existing codebase represented by [source code, repository, or project context]. Follow the conventions of [project or organization].
</context>
<constraints>
Catch the most specific relevant exceptions and handle them at the appropriate layer. Preserve the original error context when adding useful messages. Return [expected response, error object, or fallback value] for recoverable failures. Log diagnostic details in a structured and consistent format, redact sensitive data, and avoid exposing internal implementation details to users. Prevent unhandled exceptions while keeping the control flow clear and testable. Include automated tests for [success, failure, edge case, and recovery scenarios].
</constraints>
<format>
Provide the implementation as [file path or code files], followed by concise integration notes and test results. Clearly identify any assumptions or required configuration values.
</format>
<tone>
Use a clear, professional, security-conscious, and maintainable engineering style.
</tone>
<final_action>
Implement the exception handler now and return the requested files, integration notes, and test results.
</final_action>