Migrate Items added through old Timeline plugin

[jeremyboggs]

The older Timeline plugin let users create an Omeka Item with the Timeline item type, and then associate a tag to that timeline, to pull in items with that tag.

We should add some kind of migration, to covert any items of the type Timeline into NeatlineTime Timeline records. This would involve moving the following data:

• DC:Title (NeatlineTimeTimeline->title)
• DC:Description (NeatlineTimeTimeline->description)
• ItemTypeMetadata:Tag (NeatlineTimeTimeline->query as serialized array)
• Creator ID (NeatlineTimeTimeline->creator_id)
• Date added
• Public
• Featured

'date_modified' would be set to whenever the migration took place, perhaps.

Should also possibly provide an option to delete any Items from the Timeline plugin after the migration.

[jeremyboggs]

Closing as wontfix, opting instead to provide a separate script for users of the old Timeline plugin who wish to migrate their data to NeatlineTime.