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**CODE REVIEW FEEDBACK**
**Overall:** Good structure, but some performance and security concerns.
**🔴 CRITICAL**
Line 23: SQL injection vulnerability
```
query = f"SELECT * FROM users WHERE id = {user_id}"
```
Fix: Use parameterized queries
```
query = "SELECT * FROM users WHERE id = ?"
cursor.execute(query, (user_id,))
```
**🟡 IMPROVEMENTS**
Line 45-67: This loop runs N+1 queries
Consider: Batch fetch with `WHERE id IN (...)`
Line 12: `data` is too generic
Rename to: `user_preferences` for clarity
**🟢 NICE TO HAVE**
Line 89: Add docstring explaining return format
**SUMMARY**
Fix the SQL injection before merging. The N+1 query should be addressed but can be a follow-up PR.Loading workflow...
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