Fix GUID Handling

[LukasGPC]

From my Code Analysis:

• Issue Fix GUID Handling #3 (UUID panic): No bounds checking in GetListItem() line 125
• Issue COUNT Queries with JOINs Cause Panic **Severity:** ⚠️ CRITICAL #8 (UUID warnings): Missing GUID case in fromODBC() switch

Recommendations:

Priority 3: Fix GUID Type Handling (Fixes Issue #8)

• Add case GUID: to fromODBC() switch
• Estimated time: 30 minutes coding + 30 minutes testing

[LukasGPC]

This is related to Issue #7 which is critical and Issue #12 which is annoying because it fills logs with lots of non-useful info