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Bug: UUID Truncation: A Collision Course
Taking only the first 4 characters from
uuid.uuid4()provides only 65,536 possible values (16^4), which creates a high collision risk. The birthday paradox means collisions become likely after just a few hundred model creations, reintroducing the "output model exists" errors this change aims to prevent. Usinguuid.uuid4().hex[:8]or the full hex would provide better uniqueness.