An alternative to the unity build, the classic build compiles each
translation unit individually. This adds more modules to the classic build:
* Remove unity header app.h
* Add missing includes as needed
* Remove obsolete NodeStore backend code
* Add app/, core/, crypto/, json/, net/, overlay/, peerfinder/ to classic build
The correct ledger age is necessary for checking health
status, and the previous behavior caused the online deletion process to
abort if the process took too long.
The tuning parameter added and the parameter whose default was modified both
minimize impact of SQL DELETE operations by decreasing the default batch size
for deletes and for increasing the backoff period between deletion batches.
These parameters decrease contention for the SQLite and I/O with the trade-off
of longer processing time for online delete. Online-delete is not a
time-critical function, so a little slowness in wall-clock time is not harmful.
Makes rippled configurable to support deletion of all data in its key-value
store (nodestore) and ledger and transaction SQLite databases based on
validated ledger sequence numbers. All records from a specified ledger
and forward shall remain available in the key-value store and SQLite, and
all data prior to that specific ledger may be deleted.
Additionally, the administrator may require that an RPC command be
executed to enable deletion. This is to align data deletion with local
policy.
