Fix database write guard #2424

Job	Run time
Linux [UBSAN] [lmdb \| clang]	39m 44s
Linux [ASAN] [lmdb \| clang]	40m 25s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	39m 22s
Linux [TSAN] [lmdb \| clang]	40m 40s
Linux [LEAK] [lmdb \| clang]	40m 37s
Linux [UBSAN] [rocksdb \| clang]	50m 24s
Linux [ASAN] [rocksdb \| clang]	54m 14s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	56m 19s
Linux [LEAK] [rocksdb \| clang]	53m 0s
macOS [UBSAN] [lmdb \| clang]	38m 38s
macOS [ASAN] [lmdb \| clang]	42m 28s
macOS [TSAN] [lmdb \| clang]	33m 58s
macOS [UBSAN] [rocksdb \| clang]	47m 50s
macOS [ASAN] [rocksdb \| clang]	42m 51s
macOS [TSAN] [rocksdb \| clang]	57m 30s
	11h 18m 0s

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