Database scan improvements #2246

Job	Run time
Linux [UBSAN] [lmdb \| clang]	39m 21s
Linux [ASAN] [lmdb \| clang]	41m 59s
macOS [UBSAN] [lmdb \| clang]	34m 55s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	40m 13s
macOS [ASAN] [lmdb \| clang]	31m 41s
Linux [TSAN] [lmdb \| clang]	39m 53s
macOS [TSAN] [lmdb \| clang]	35m 5s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	39m 24s
macOS [UBSAN] [rocksdb \| clang]	51m 43s
Linux [UBSAN] [rocksdb \| clang]	53m 20s
macOS [ASAN] [rocksdb \| clang]	45m 19s
Linux [ASAN] [rocksdb \| clang]	58m 25s
macOS [TSAN] [rocksdb \| clang]	1h 1m 51s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	56m 13s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	55m 35s
	11h 24m 57s

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