[WIP] Define remaining transactions, start implementing LoanBrokerSet

- Does not build
- Transactions: LoanDelete, LoanManage, LoanDraw, LoanPay
- LoanBrokerSet creation mostly done. Need update.
- Also added a lookup table for pseudo account fields.

include/xrpl/protocol/Protocol.h

@@ -82,6 +82,26 @@ std::size_t constexpr maxDeletableTokenOfferEntries = 500;
  */
 std::uint16_t constexpr maxTransferFee = 50000;
 
+/** The maximum management fee rate allowed in lending.
+
+    TODO: Is this a good name?
+
+    Valid values for the the management fee charged by the Lending Protocol are
+    between 0 and 10000 inclusive. A value of 1 is equivalent to 1/10 basis
+    point fee or 0.001%.
+*/
+std::uint16_t constexpr maxFeeRate = 10'000;
+
+/** The maximum coverage rate allowed in lending.
+
+    TODO: Is this a good name?
+
+    Valid values for the coverage rate charged by the Lending Protocol for first
+    loss capital operations are between 0 and 100000 inclusive. A value of 1 is
+    equivalent to 1/10 bps or 0.001%.
+*/
+std::uint16_t constexpr maxCoverRate = 100'000;
+
 /** The maximum length of a URI inside an NFT */
 std::size_t constexpr maxTokenURILength = 256;
 

include/xrpl/protocol/TxFlags.h

@@ -237,6 +237,13 @@ constexpr std::uint32_t const tfVaultCreateMask = ~(tfUniversal | tfVaultPrivate
 // True, indicates the load supports overpayments
 constexpr std::uint32_t const tfLoanOverpayment = 0x00010000;
 constexpr std::uint32_t const tfLoanSetMask = ~(tfUniversal | tfLoanOverpayment);
+
+// LoanManage flags:
+constexpr std::uint32_t const tfLoanDefault = 0x00010000;
+constexpr std::uint32_t const tfLoanImpair = 0x00010000;
+constexpr std::uint32_t const tfLoanUnimpair = 0x00010000;
+constexpr std::uint32_t const tfLoanManageMask = ~(tfUniversal | tfLoanDefault | tfLoanImpair | tfLoanUnimpair);
+
 // clang-format on
 
 }  // namespace ripple

include/xrpl/protocol/detail/ledger_entries.macro

@@ -501,12 +501,12 @@ LEDGER_ENTRY(ltLOAN_BROKER, 0x0084, LoanBroker, loan_broker, ({
     {sfOwner,                soeREQUIRED},
     {sfData,                 soeDEFAULT},
     {sfManagementFeeRate,    soeDEFAULT},
-    {sfOwnerCount,           soeREQUIRED},
-    {sfDebtTotal,            soeREQUIRED},
-    {sfDebtMaximum,          soeREQUIRED},
-    {sfCoverAvailable,       soeREQUIRED},
-    {sfCoverRateMinimum,     soeREQUIRED},
-    {sfCoverRateLiquidation, soeREQUIRED},
+    {sfOwnerCount,           soeDEFAULT},
+    {sfDebtTotal,            soeDEFAULT},
+    {sfDebtMaximum,          soeDEFAULT},
+    {sfCoverAvailable,       soeDEFAULT},
+    {sfCoverRateMinimum,     soeDEFAULT},
+    {sfCoverRateLiquidation, soeDEFAULT},
 }))
 
 /** A ledger object representing a loan between a Borrower and a Loan Broker

include/xrpl/protocol/detail/sfields.macro

@@ -211,6 +211,7 @@ TYPED_SFIELD(sfHookSetTxnID,             UINT256,   33)
 TYPED_SFIELD(sfDomainID,                 UINT256,   34)
 TYPED_SFIELD(sfVaultID,                  UINT256,   35)
 TYPED_SFIELD(sfLoanBrokerID,             UINT256,   36)
+TYPED_SFIELD(sfLoanID,                   UINT256,   37)
 
 // number (common)
 TYPED_SFIELD(sfNumber,                   NUMBER,     1)

include/xrpl/protocol/detail/transactions.macro

@@ -508,7 +508,6 @@ TRANSACTION(ttVAULT_CLAWBACK, 69, VaultClawback, ({
     {sfAmount, soeOPTIONAL, soeMPTSupported},
 }))
 
-#if 0
 /** This transaction creates and updates a Loan Broker */
 TRANSACTION(ttLOAN_BROKER_SET, 70, LoanBrokerSet, ({
     {sfVaultID, soeREQUIRED},
@@ -520,6 +519,7 @@ TRANSACTION(ttLOAN_BROKER_SET, 70, LoanBrokerSet, ({
     {sfCoverRateLiquidation, soeDEFAULT},
 }))
 
+#if 0
 /** This transaction deletes a Loan Broker */
 TRANSACTION(ttLOAN_BROKER_DELETE, 71, LoanBrokerDelete, ({
     {sfLoanBrokerID, soeREQUIRED},
@@ -556,6 +556,28 @@ TRANSACTION(ttLOAN_SET, 74, LoanSet, ({
     {sfPaymentInterval, soeOPTIONAL},
     {sfGracePeriod, soeOPTIONAL},
 }))
+
+/** This transaction deletes an existing Loan */
+TRANSACTION(ttLOAN_DELETE, 75, LoanDelete, ({
+    {sfLoanID, soeREQUIRED},
+}))
+
+/** This transaction is used to change the delinquency status of an existing Loan */
+TRANSACTION(ttLOAN_MANAGE, 76, LoanManage, ({
+    {sfLoanID, soeREQUIRED},
+}))
+
+/** The Borrower uses this transaction to draws funds from the Loan. */
+TRANSACTION(ttLOAN_DRAW, 77, LoanDraw, ({
+    {sfLoanID, soeREQUIRED},
+    {sfAmount, soeREQUIRED},
+}))
+
+/** The Borrower uses this transaction to make a Payment on the Loan. */
+TRANSACTION(ttLOAN_PAY, 77, LoanPay, ({
+    {sfLoanID, soeREQUIRED},
+    {sfAmount, soeREQUIRED},
+}))
 #endif
 
 /** This system-generated transaction type is used to update the status of the various amendments.