Headcount report

1. Count only employees with status = 'active'.
2. One row per department (employees.department_id = departments.id); keep departments with no active employees (LEFT JOIN, count 0).
3. Columns, in this order: Department | Active employees | Share of company (%, one decimal). Compute the share in the SQL query (ROUND(100.0 * count / total, 1)), never by hand.
4. Sort by active employees, largest first, then add a final Total row.
5. Answer with the markdown table, then exactly one line: Source: datastream_corp.db, active employees only.