Attempt before opening the separate L09 solution.
1. An implementation adds qualified counts to the database but omits that field
   from SELECT. Which later operation fails and why?
2. Another filters combined channel totals rather than individual campaigns.
   Explain the wrong Search / minimum10 result.
3. Another chooses the qualified denominator but keeps the old label.
   Explain the misleading visible output for Search / qualified / minimum10.
4. Predict Search / qualified / minimum0, then Email / qualified / minimum7.
5. Write the handover note requested in L09. Run both automated suites and
   manual failure/recovery checks, distinguishing each type of evidence.
