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## Build
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First build static lib for RocksDB
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```bash
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cd rocksdb
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USE_RTTI=1 DEBUG_LEVEL=0 make static_lib
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```
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## Edge key layout
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* Different src/tgt
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* Forward `[true, src_keys, null, tgt_keys]`
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* Backward `[false, src_keys, null, tgt_keys]`
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* Same src/tgt
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* Forward `[null, src_keys, true, tgt_keys]`
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* Backward `[null, src_keys, false, tgt_keys]`
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## Isolation levels
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* Read uncommitted: write to the raw DB
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* Read committed: use transaction
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* Repeatable read: use snapshot
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* Serializable: do all reads with `GetForUpdate`
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