Many things need to be moved to a plugin

[vikramrajkumar]

From @theoreticalbts on October 30, 2015 19:42

Things in core that need to move to plugins:

Indexes:

• account_member_index

Objects:

• impl_account_transaction_history_object_type
• impl_witness_schedule_object_type
• impl_budget_record_object_type
• remove impl_reserved0_object_type
• remove custom_object_type
• operation_history_object_type

Fields:

• account_object.whitelisted_accounts
• account_object.blacklisted_accounts
• witness_object.last_aslot
• witness_object.url
• witness_object.total_missed
• witness_object.last_confirmed_block_num
• dpo.recent_slots_filled
• dpo.last_irreversible_block_num
• dpo.recently_missed_count

Copied from original issue: cryptonomex/graphene#422

[pmconrad]

The usefulness of plugins is currently somewhat limited, because the new_objects, changed_objects and removed_objects callbacks are effectively disabled during a replay. This makes it impossible, for example, to collect certain historic data in a plugin, i. e. everything that is not represented somehow in signed_block.operations.
I'm not sure if this limitation is on purpose. The callbacks mentioned above rely on undo_db, which is disabled during replay for performance reasons. I tested a replay with undo_db enabled, and it took 20% longer than without on the current chain (~19M blocks).