backend/app.py: Missing request input validation for incoming JSON payloads #433

Where

backend/app.py

Issue

Missing request input validation for incoming JSON payloads

Proposed Fix

Implement a schema validation library like Pydantic or Marshmallow for all POST/PUT routes

Why This Matters

Prevents malformed data from crashing the application or corrupting database records

I would like to work on this issue.

@devanshi14malhotra /assign