Increase index flags capacity. Store transaction number as plain int6… #6715

Job	Run time
build-linux-ubuntu-x64-clang	9m 18s
build-alpine-x64	14m 17s
build-linux-docker-x86	1m 59s
build-android-arm32-initial	8m 1s
build-linux-docker-x64	10m 40s
build-android-arm64-initial	8m 13s
build-macos-x64	12m 38s
build-linux-docker-arm32	19m 43s
build-android-x86-initial	6m 5s
build-src-bundle-docker	1m 22s
build-macos-arm64	5m 53s
build-linux-docker-arm64	20m 41s
build-android-x64-initial	8m 56s
build-windows (windows-2022, x64)	9m 27s
build-windows-docker (x64)	45m 28s
build-windows (windows-2022, x86)	11m 14s
build-windows-docker (x86)	31m 43s
build-windows (windows-2019, x64)	10m 30s
build-windows (windows-2019, x86)	9m 10s
build-android-${{ matrix.arch }}-final	0s
build-android-aar	0s
	4h 5m 18s

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