Previously both Python code AND SQL triggers were incrementing/decrementing
ref_count, causing inconsistent values. Now:
- New artifacts start with ref_count=0 (triggers increment on tag creation)
- Tag INSERT/UPDATE/DELETE triggers handle all ref_count changes
- Python code only logs operations, doesn't manipulate ref_count
- Delete endpoints rely on cascade + triggers for ref_count management
Tested: new uploads, duplicates, tag deletion, package deletion (cascade),
project deletion (cascade) - all ref_count values now correct.
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