Quarry Support logs a new sequence of workload movements. The first day in a team has no preceding day within that team, and a negative movement reduces the running total. Keep those two ideas separate: a previous-day value describes a neighboring record, while a running total describes the entire sequence so far.
The day-measure tasks use a wide table. Apply the same expression to the selected day columns and keep the source fields for comparison. Tile tasks divide the incoming stream by record count; they don't sort it by performance. Inspect boundary rows, generated output names and the group settings before treating a result as a report. These are transfer exercises using the stateful tools already introduced.