This table doesn't have `id`, except as the implicit one in Sqlite3,
so we need to add it for postgres.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Adding an index means:
1. Add the new subsystem, and new updated_index field to the db, and
create xxx_index_deleted/created/updated APIs.
2. Hook up these functions to the points they need to be called.
3. Add index, start and limit fields to the list command.
4. Add created_index and updated_index into the list command.
This does #1.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This will initially be for listinvoices, but can be expanded to other
list commands.
It's documented, but it makes promises which currently don't exist:
* listinvoice does not support `index` or `start` yet.
* It doesn't actually fire when invoices change yet.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: JSON-RPC: `wait`: new generic command to wait for events.
