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Changelist

This PR fixes a bug whereby the application allowed blooms (posts) longer than 280 characters to be saved to the database. While the frontend had validation, the backend lacked a "security guard" to prevent direct API requests or scripts from bypassing the limit.

The Problem: The application was only validating bloom length on the frontend. This allowed scripts (like populate.py) or direct API requests to save blooms longer than 280 characters, breaking the business rules.

The Fix:

• Added a MAX_BLOOM_LENGTH constant (280) to the backend.
• Updated the send_bloom function in endpoints.py to check the length of the incoming content.
• The backend now returns a 400 Bad Request if the bloom exceeds the limit.

Verification:

• I performed a factory reset of the database and ran populate.py.
• Confirmed that the backend successfully rejected the oversized bloom from the script with a 400 error.
• Verified via DBeaver that the invalid bloom was not saved to the database.