State expiration

Stellar-ledger.x

@@ -490,11 +490,46 @@ struct LedgerCloseMetaV1
     SCPHistoryEntry scpInfo<>;
 };
 
+struct LedgerCloseMetaV2
+{
+    LedgerHeaderHistoryEntry ledgerHeader;
+
+    GeneralizedTransactionSet txSet;
+
+    // NB: transactions are sorted in apply order here
+    // fees for all transactions are processed first
+    // followed by applying transactions
+    TransactionResultMeta txProcessing<>;
+
+    // upgrades are applied last
+    UpgradeEntryMeta upgradesProcessing<>;
+
+    // other misc information attached to the ledger close
+    SCPHistoryEntry scpInfo<>;
+
+    // Size in bytes of BucketList, to support downstream
+    // systems calculating storage fees correctly.
+    uint64 totalByteSizeOfBucketList;
+
+    // Expired temp keys that are being evicted at this ledger.
+    LedgerKey evictedTemporaryLedgerKeys<>;
+
+    // Expired restorable ledger entries that are being
+    // evicted at this ledger.
+    LedgerEntry evictedRestorableLedgerEntries<>;
+
+    // We forgot to add an ExtensionPoint in v1 but at least
+    // we can add one now in v2.
+    ExtensionPoint ext;
+};
+
 union LedgerCloseMeta switch (int v)
 {
 case 0:
     LedgerCloseMetaV0 v0;
 case 1:
     LedgerCloseMetaV1 v1;
+case 2:
+    LedgerCloseMetaV2 v2;
 };
 }