INSERT IGNORE INTO {$NAMESPACE}_file.file_attachment
  (objectPHID, filePHID, attachmentMode, attacherPHID,
    dateCreated, dateModified)
  SELECT dst, src, 'attach', null, dateCreated, dateCreated
    FROM {$NAMESPACE}_file.edge
    WHERE type = 26
    ORDER BY dateCreated ASC;

Copy file attachment edges to new storage
Copy file attachment edges to new storage

Summary: Ref T13603. Copy all existing file attachment data into the new storage table.

Test Plan: Ran migration, checked attachment table for general reasonableness.

Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam

Maniphest Tasks: T13603

Differential Revision: https://secure.phabricator.com/D21818
