Exception handling improvements

[rkritika1508]

Describe the bug
The catch-all exception handler sends str(exc) directly to the API client. In production, this can expose file paths, database errors, stack trace fragments, and other sensitive internal details. Update the exceptions to more generic ones and avoid sharing sensitive information to the user.

To Reproduce
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Additional context
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