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Pull Request Overview

This PR replaces deprecated datetime.utcnow() calls with datetime.now(timezone.utc) throughout the codebase to use timezone-aware datetime objects and follow modern Python best practices.

• Updates all imports to include the timezone module from datetime
• Replaces datetime.utcnow() calls with datetime.now(timezone.utc) in webhook operations
• Updates database model default timestamp functions to use timezone-aware datetime

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
app/webhooks.py	Updates webhook timestamp generation to use timezone-aware datetime
app/models.py	Updates database model default timestamps to use timezone-aware datetime
app/currency.py	Updates exchange rate age calculations to use timezone-aware datetime

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