Banner impression data provided by the WMF needs to be stored in a database for use by the a/b test analysis tool. There are some additional steps during processing the numbers to meet the requirements of the a/b test analysis tool.

Acceptance Criteria

• In the analytics and reporting tools of the Fundraising operation center, the new values are being used and displayed.
• There is a way to switch data sources for the numbers.

Notes
It might be a good idea to keep both setups in parallel for the upcoming campaign. We'd need different application entry points, data tables and a simple way to switch data sources for a/b test analysis during the campaign.

Changing this touches parts of the application that would be happy about refactoring.

Implementation hints

• Extract and break down Analysis::getImpressions() into smaller classes/methods.
• Reuse the extracted code in the "Campaign monitor per hour" report.