API returning 500 Internal Server Error for /fetch/* endpoints

[PiiSmith]

Description

The API is returning 500 Internal Server Error for data fetch endpoints (steps, nutrition, etc.) while the login endpoint works correctly.

Steps to reproduce

1. Login via POST /api/v2/login - Returns 201 ✅
2. Request data via POST /api/v2/fetch/steps with valid Bearer token - Returns 500 ❌

Observed behavior

• Login: Works (status 201)
• /fetch/steps: 500 Internal Server Error
• /fetch/nutrition: 404 or 500
• Other /fetch/* endpoints: Also returning 500

Expected behavior

Data endpoints should return health data for authenticated users.

Environment

• API URL: https://api.hcgateway.shuchir.dev/api/v2/
• Date: 2026-02-19
• Error persists across multiple attempts over several hours

Additional context

The server appears to be running but data retrieval is broken. This may be related to the recent MongoDB migration mentioned in the README.