perf: upsert fast path #3287

Job	Run time
Build	5m 3s
Verify build-browser (windows-latest)	1m 58s
Build samples	24s
Print commit stats	1m 12s
Verify build-browser (macos-26)	59s
Verify build-browser (ubuntu-latest)	43s
Unit test	3m 16s
Type definitions test	1m 53s
Static code analysis	4m 3s
HTML test (2/17)	7m 51s
HTML test (9/17)	8m 24s
HTML test (4/17)	7m 42s
HTML test (3/17)	7m 37s
HTML test (6/17)	8m 1s
HTML test (1/17)	7m 8s
HTML test (8/17)	7m 15s
HTML test (12/17)	7m 29s
HTML test (10/17)	7m 29s
HTML test (5/17)	8m 8s
HTML test (14/17)	7m 53s
HTML test (7/17)	7m 16s
HTML test (15/17)	7m 35s
HTML test (11/17)	7m 42s
HTML test (13/17)	7m 31s
HTML test (16/17)	7m 56s
HTML test (17/17)	7m 48s
Merge test snapshots	5s
Merge test results	25s
	2h 30m 46s

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