sql support for localStorage
simple cursor test passed.
cursor resume bug fix.
compiled sync
updating new format.
preHook and postHook method signature changes.
introduce sync entry class.
simplar entry
REST sync read passed.
change sync to atomic thread.
s3 sync added
tx on sync.
tx on sync etag.
before refactoring preHook
simple hook
REST sync passed
fixing sync thread.
fixing sync thread.
s3 sync fix.
Google cloud storage sync added.