fix(tsql): register the deltaSumTimestampMerge aggregate

Queries using deltaSumTimestampMerge failed with an unknown function error, which broke the queue detail stats and the started counts on the built in Queues dashboard.

Author: ericallam

internal-packages/tsql/src/query/functions.ts

@@ -650,6 +650,12 @@ export const TSQL_AGGREGATIONS: Record<string, TSQLFunctionMeta> = {
   countMerge: { clickhouseName: "countMerge", minArgs: 1, maxArgs: 1, aggregate: true },
   minMerge: { clickhouseName: "minMerge", minArgs: 1, maxArgs: 1, aggregate: true },
   maxMerge: { clickhouseName: "maxMerge", minArgs: 1, maxArgs: 1, aggregate: true },
+  deltaSumTimestampMerge: {
+    clickhouseName: "deltaSumTimestampMerge",
+    minArgs: 1,
+    maxArgs: 1,
+    aggregate: true,
+  },
 
   // Statistical functions
   simpleLinearRegression: {