remove unused offers code

src/backend/BackendInterface.cpp

@@ -39,20 +39,15 @@ void
 BackendInterface::writeLedgerObject(
     std::string&& key,
     uint32_t seq,
-    std::string&& blob,
-    bool isCreated,
-    bool isDeleted,
-    std::optional<ripple::uint256>&& book) const
+    std::string&& blob) const
 {
+    assert(key.size() == sizeof(rippled::uint256));
     ripple::uint256 key256 = ripple::uint256::fromVoid(key.data());
     indexer_.addKey(std::move(key256));
     doWriteLedgerObject(
         std::move(key),
         seq,
-        std::move(blob),
-        isCreated,
-        isDeleted,
-        std::move(book));
+        std::move(blob));
 }
 std::optional<LedgerRange>
 BackendInterface::hardFetchLedgerRangeNoThrow() const

src/backend/BackendInterface.h

@@ -204,10 +204,7 @@ protected:
     writeLedgerObject(
         std::string&& key,
         uint32_t seq,
-        std::string&& blob,
-        bool isCreated,
-        bool isDeleted,
-        std::optional<ripple::uint256>&& book) const;
+        std::string&& blob) const;
 
     virtual void
     writeTransaction(
@@ -263,10 +260,7 @@ private:
     doWriteLedgerObject(
         std::string&& key,
         uint32_t seq,
-        std::string&& blob,
-        bool isCreated,
-        bool isDeleted,
-        std::optional<ripple::uint256>&& book) const = 0;
+        std::string&& blob) const = 0;
 
     virtual bool
     doFinishWrites() const = 0;

src/backend/CassandraBackend.cpp

@@ -148,10 +148,7 @@ void
 CassandraBackend::doWriteLedgerObject(
     std::string&& key,
     uint32_t seq,
-    std::string&& blob,
-    bool isCreated,
-    bool isDeleted,
-    std::optional<ripple::uint256>&& book) const
+    std::string&& blob) const
 {
     BOOST_LOG_TRIVIAL(trace) << "Writing ledger object to cassandra";
     makeAndExecuteAsyncWrite(

src/backend/CassandraBackend.h

@@ -833,10 +833,7 @@ public:
     doWriteLedgerObject(
         std::string&& key,
         uint32_t seq,
-        std::string&& blob,
-        bool isCreated,
-        bool isDeleted,
-        std::optional<ripple::uint256>&& book) const override;
+        std::string&& blob) const override;
 
     void
     writeAccountTransactions(

src/backend/PostgresBackend.cpp

@@ -60,10 +60,7 @@ void
 PostgresBackend::doWriteLedgerObject(
     std::string&& key,
     uint32_t seq,
-    std::string&& blob,
-    bool isCreated,
-    bool isDeleted,
-    std::optional<ripple::uint256>&& book) const
+    std::string&& blob) const
 {
     if (abortWrite_)
         return;

src/backend/PostgresBackend.h

@@ -79,10 +79,7 @@ public:
     doWriteLedgerObject(
         std::string&& key,
         uint32_t seq,
-        std::string&& blob,
-        bool isCreated,
-        bool isDeleted,
-        std::optional<ripple::uint256>&& book) const override;
+        std::string&& blob) const override;
 
     void
     writeTransaction(