fix : added max length guard on question and answer fields in ValidateQuestions

[tmdeveloper007]

Summary of What Has Been Done

Added max length constraints to question (5000 chars) and answer (10000 chars) fields in backend/Input_validators/ValidateQuestions.js. Previously z.string().min(1, ...) was used without any .max() guard.

Changes Made

Modified backend/Input_validators/ValidateQuestions.js:

• addQuestionToSessionSchema.questions[].question: added .max(5000, "Question must be at most 5000 characters")
• addQuestionToSessionSchema.questions[].answer: added .max(10000, "Answer must be at most 10000 characters")

Impact it Made

• Prevents excessively long question/answer strings from being stored
• Consistent with the flashcard validator which already has these limits
• Protects MongoDB storage from unbounded document sizes

Closes #1543

**Note: Please assign this PR to the tmdeveloper007 account.

Summary

• Add maximum length validation to question and answer fields.
• Limit question to 5,000 characters.
• Limit answer to 10,000 characters.
• Retain required-field validation.

Ready to merge.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: d5908d1d-e2d2-411d-a1fb-debccf2eaca3

📥 Commits

Reviewing files that changed from the base of the PR and between 4ba01aa and 4d4b836.

📒 Files selected for processing (1)

• backend/Input_validators/ValidateQuestions.js

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📝 Walkthrough

Walkthrough

The question session validation schema now limits question text to 5,000 characters and answer text to 10,000 characters. Required-field validation remains unchanged.

Changes

Question validation

Layer / File(s)	Summary
Add question and answer length constraints backend/Input_validators/ValidateQuestions.js	addQuestionToSessionSchema now rejects question text longer than 5,000 characters and answer text longer than 10,000 characters, with specific validation messages.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• Canopus-Labs/PrepPilot#1408: Modifies the same validator with the same question and answer limits.
• Canopus-Labs/PrepPilot#1478: Adds identical limits in closely related question validators.
• Canopus-Labs/PrepPilot#1407: Adds the same maximum-length limits to backend input-validation schemas.

Suggested reviewers: dev1822

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the max-length guards added to the question and answer fields.
Linked Issues check	✅ Passed	The changes implement the linked issue requirements for 5,000-character questions and 10,000-character answers.
Out of Scope Changes check	✅ Passed	The changes are limited to the requested validation guards in ValidateQuestions.js.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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