new table: remote storage connection for accounts
save storage URL for remote storage
Some column cleanup.  Add accounts.new_post_in_river column.
Revert "save storage URL for remote storage"

This reverts commit d014f61a04fa08cf1b64c31a93549ddf9713f11b.
Revert "new table: remote storage connection for accounts"

This reverts commit f86e940901df9d442855cf82c95ff13c2a4ff969.
make database host and password optional
new column to record the reason for retrying a job