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2026.9.26.2: one compile database per configuration, emit plans every… #755

Job	Run time
invariants (macos-arm64)	3m 34s
invariants (windows-x86_64)	6m 3s
invariants (linux-aarch64)	5m 29s
invariants (linux-x86_64)	6m 28s
scan (linux-x86_64)	9m 47s
scan (macos-arm64)	4m 50s
scan (linux-aarch64)	4m 39s
scan (windows-x86_64)	10m 37s
coverage (every host the table names was scanned)	5s
	51m 32s