perf: rollup Week/Quarter from Day-level queries

[PMerlet]

Summary

• Week and Quarter aggregations now query at Day granularity (LEFT(field, 10)) instead of using expensive Cosmos DB computed expressions (DateTimeAdd, DateTimePart, FLOOR, CONCAT) in GROUP BY
• Daily results are rolled up into week/quarter buckets in application-level post-processing
• This eliminates timeouts on large datasets (the previous Week query timed out after 25s on the Xpollens Operations collection)

Before (slow, times out)

SELECT LEFT(DateTimeAdd("day", -1 * ((DateTimePart("dw", c.operationDate) + 5) % 7), c.operationDate), 10) as groupKey, COUNT(1) as aggregateValue FROM c GROUP BY ...

After (fast, ~5 RUs)

SELECT LEFT(c.operationDate, 10) as groupKey, COUNT(1) as aggregateValue FROM c GROUP BY LEFT(c.operationDate, 10)

Then weeks/quarters are computed in processAggregationResults.

Test plan

• 47 unit tests pass, including:
  • Week rollup: daily rows merged into Monday-keyed weeks
  • Quarter rollup: daily rows merged into quarter-start dates (01-01, 04-01, 07-01, 10-01)
  • Sunday correctly rolls to previous Monday
  • All four quarters handled
  • Combined with WHERE conditions and field aggregations
• Tested live on Xpollens Cosmos DB — Day chart returns 200 in ~850ms with 5.43 RUs

🤖 Generated with Claude Code

Note

Roll up Week/Quarter aggregations from Day-level Cosmos DB queries in post-processing

• Previously, Week and Quarter groupings used complex Cosmos DB SQL expressions (DateTimePart, DateTimeAdd, CONCAT, FLOOR) to compute bucket boundaries, which had reliability issues.
• Now, AggregationConverter.buildDateGroupExpression groups by day (LEFT(field, 10)) for Week and Quarter, and new rollupResults post-processes daily rows into Monday-starting weekly or quarter-start buckets.
• Reduction semantics are handled per operation: Max/Min pick extrema, Sum/Count add, and Avg divides the accumulated sum by the number of days per bucket.
• Behavioral Change: Week and Quarter query results are now computed in application memory rather than in Cosmos DB SQL, and weeks start on Monday.

^{Macroscope summarized 1a1e2b9.}