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The page "History" has been deleted by JoanTouzet: https://wiki.apache.org/couchdb/History?action=diff&rev1=7&rev2=8 Comment: nice idea but it never happened. - = Proposal for CouchDB history support = - * Every time a document is changed, store the existing document as an attachment before writing the updated document. - * For space efficiency, historical attachments are stored separately i.e. not inline with the historical JSON document. - * The special "history" attachments will be stored using a special prefix of "_history/<_rev>". - * If people need to add meta-data to the history, e.g. "last changed by", "last changed date/time", then the recommended way would be to use a custom _update handler to add these fields to the doc being saved, and these would propagate to the history attachment. - * In future we can add delta support to further improve efficiency. - - == Use cases == - - The main use case we want to support is the ability to recover from catastrophic user errors e.g. if they delete an important document, or overwrite something important. I don't think supporting use cases such as rolling back to particular snapshots is within the scope of this proposal. - - == Implementation == - - Native Erlang patch to core CouchDB. We probably want the ability to turn this on/off on a per-db basis via a .ini config option. -