Write SQL to analyze Group Calls adoption

A group-calling feature was released behind an A/B test, and the analytics team needs PostgreSQL queries that answer three separate questions about that rollout: how widely the feature was adopted, whether it drew usage away from one-to-one calling, and whether members of the two test arms ended up sharing calls often enough to muddy the read. The tables involved are: users — user_id INT (primary key), signup_date DATE, country TEXT experiments — experiment_name TEXT,…