What is the logic behind the change you are implementing, and why did you add the silver membership status?

The change introduces a new paid tier called SILVER to provide a middle ground between the free tier and the premium GOLD tier. The logic is to segment users by the level of commitment and the benefits they receive. By adding SILVER, we can offer a lower price point that still qualifies as a paid member, which is important for revenue diversification and user retention. The function get_membership_statistics() now needs to treat both SILVER and GOLD as paid, so the filter checks for membership_status in (Status.SILVER, Status.GOLD). This ensures that metrics like total_paid_members include all users who have paid, regardless of tier. From a business perspective, the silver tier can unlock features such as limited analytics, priority support, or early access, while still keeping the cost accessible. The change also aligns with the product roadmap that aims to introduce tiered pricing to capture more of the market. This approach also allows us to track adoption rates for each tier and adjust pricing or feature sets accordingly.