Automatic database backend #2302

Job	Run time
Linux [UBSAN] [lmdb \| clang]	40m 42s
Linux [ASAN] [lmdb \| clang]	40m 19s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	43m 46s
macOS [UBSAN] [lmdb \| clang]	32m 35s
macOS [ASAN] [lmdb \| clang]	35m 21s
macOS [TSAN] [lmdb \| clang]	32m 56s
macOS [UBSAN] [rocksdb \| clang]	43m 28s
Linux [TSAN] [lmdb \| clang]	43m 2s
macOS [ASAN] [rocksdb \| clang]	48m 34s
macOS [TSAN] [rocksdb \| clang]	49m 48s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	38m 55s
Linux [UBSAN] [rocksdb \| clang]	55m 43s
Linux [ASAN] [rocksdb \| clang]	54m 24s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	1h 1m 1s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	59m 56s
	11h 20m 30s

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