removing unecessary field

libraries/chain/db_block.cpp

@@ -578,7 +578,6 @@ void database::create_block_summary(const signed_block& next_block)
    block_summary_id_type sid(next_block.block_num() & 0xffff );
    modify( sid(*this), [&](block_summary_object& p) {
          p.block_id = next_block.id();
-         p.timestamp = next_block.timestamp;
    });
 }
 

libraries/chain/include/graphene/chain/block_summary_object.hpp

@@ -37,7 +37,6 @@ namespace graphene { namespace chain {
          static const uint8_t type_id  = impl_block_summary_object_type;
 
          block_id_type      block_id;
-         fc::time_point_sec timestamp;
    };
 
 } }