Fix: improve backend validation, security and data integrity across APIs#18

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BhathiyaVicum wants to merge 11 commits intoJavaScript-Mastery-Pro:mainfrom

BhathiyaVicum:main

Commits on Apr 20, 2026

fix(profile): prevent empty name causing Teacher validation error
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fix(grades): resolve circular JSON error in grades POST
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fix(students): add missing validation check for request body
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fix(students): add missing validation check for request body
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fix(announcements): add default audience field
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fix(grades): restrict grade updates to owner only
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fix(grades): restrict grade deletion to owner only
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fix(students): improve authorization and input validation in update/delete routes
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fix(grades): ensure studentId is cast to ObjectId in GET query
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fix(attendance): validate class field to prevent empty values
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fix(grade): prevent invalid marks in findOneAndUpdate
BhathiyaVicum
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