mgrVersionName
mgrCreateDateName

    stores the encrypted crypto keys that encrypt all other generated keys

    stores the current sync state of the root manager.

            scopeBucketNme is the name of the top-level bucket within the
            hierarchy. It maps: purpose || coinType to a new sub-bucket that
            will house a scoped address manager. All buckets below are a child
            of this bucket:

            scopeBucket -> scope -> acctBucketName //account id=>dbDefaultAccountRow
            scopeBucket -> scope -> addrBucketName //addressID Hash=>dbAddressRow
            scopeBucket -> scope -> usedAddrBucketName // 一个地址是否被使用
            scopeBucket -> scope -> addrAcctIdxBucketName //addressID hash => account id
            scopeBucket -> scope -> acctNameIdxBucketName //accountName => account_id
            scopeBucket -> scope -> acctIDIdxBucketName //account_id => accountName
            scopeBucket -> scope -> metaBucket //metaData
            scopeBucket -> scope -> metaBucket -> lastAccountNameKey //manager中的最后一个account
            scopeBucket -> scope -> coinTypePrivKey //后面这两个代码没看到
            scopeBucket -> scope -> coinTypePubKey

scopeSchemaBucket is the name of the bucket that maps a particular
manager scope to the type of addresses that should be derived for
particular branches during key derivation.

	// KeyScopeBIP0049Plus is the key scope of our modified BIP0049
	// derivation. We say this is BIP0049 "plus", as we'll actually use
	// p2wkh change all change addresses.
	KeyScopeBIP0049Plus = KeyScope{
		Purpose: 49,
		Coin:    0,
	}

	// KeyScopeBIP0084 is the key scope for BIP0084 derivation. BIP0084
	// will be used to derive all p2wkh addresses.
	KeyScopeBIP0084 = KeyScope{
		Purpose: 84,
		Coin:    0,
	}

	// KeyScopeBIP0044 is the key scope for BIP0044 derivation. Legacy
	// wallets will only be able to use this key scope, and no keys beyond
	// it.
	KeyScopeBIP0044 = KeyScope{
		Purpose: 44,
		Coin:    0,
	}

	// DefaultKeyScopes is the set of default key scopes that will be
	// created by the root manager upon initial creation.
	DefaultKeyScopes = []KeyScope{
		KeyScopeBIP0049Plus,
		KeyScopeBIP0084,
		KeyScopeBIP0044,
	}

	// ScopeAddrMap is a map from the default key scopes to the scope
	// address schema for each scope type. This will be consulted during
	// the initial creation of the root key manager.
	ScopeAddrMap = map[KeyScope]ScopeAddrSchema{
		KeyScopeBIP0049Plus: {
			ExternalAddrType: NestedWitnessPubKey,
			InternalAddrType: WitnessPubKey,
		},
		KeyScopeBIP0084: {
			ExternalAddrType: WitnessPubKey,
			InternalAddrType: WitnessPubKey,
		},
		KeyScopeBIP0044: {
			InternalAddrType: PubKeyHash,
			ExternalAddrType: PubKeyHash,
		},
	}

bucketBlocks         = []byte("b")
bucketTxRecords      = []byte("t")
bucketCredits        = []byte("c")
bucketUnspent        = []byte("u")
bucketDebits         = []byte("d")
bucketUnmined        = []byte("m")
bucketUnminedCredits = []byte("mc")
bucketUnminedInputs  = []byte("mi")