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** [tickets:#8168] Remove TreesDoc usage**
**Status:** open
**Milestone:** unreleased
**Labels:** indexless
**Created:** Tue Oct 17, 2017 08:40 PM UTC by Dave Brondsema
**Last Updated:** Tue Oct 17, 2017 08:40 PM UTC
**Owner:** nobody
I think we can remove the TreesDoc model and its mongo collection which can be
quite large. [#7828] did some prior analysis. My current analysis is that
some tests & scripts will have to be updated, but generally everything should
keep working. Proof of concept is in branch `db/remove_treestuff`.
The TreesDoc model is used in some LastCommitDoc "refresh" logic currently.
Should be able to remove that and/or replace it with calls to the lazy
computation of LastCommitDocs. The only sticking point, I think, is that
TreesDoc provides a mapping of commit_id to tree_id so that some cleanup knows
what TreeDoc records can be deleted. So those would likely never be able to be
cleaned up properly. Maybe ok, removing them is very infrequent - only for
doing full repo refreshes, not even done when projects are removed (esp. since
tree info can be shared across repos/forks)
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