Fix BudgetExceededError

✅ Solution

BudgetExceededError in litellm often arises from underestimation of token costs, especially with caching, fallbacks, or incorrect cost configurations. Fix it by ensuring `model_info` in the DB reflects accurate costs, applying temporary budget increases correctly (cache and fallbacks), and verifying cost calculations align with the actual model usage. For fallbacks, ensure the cost is correctly estimated; for caching, the budget_increase should persist.