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https://github.com/mozilla/gecko-dev.git
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9320172d8f
This commit reduces the number of database writes and table scans
needed to merge synced bookmarks.
* Remove `fetchNew{Local, Remote}Contents`. Fetching the tree already
scans the table, so we can piggyback on it to fetch content info for
deduping.
* Store completion ops in temp tables to only update changed parts of
the local tree, and remove the `mergeStates` table and views.
* Replace the `itemsToMerge` view with an indexed `itemsToApply` temp
table.
* Replace the `updateGuidsAndSyncFlags` trigger with a `changeGuidOps`
table and a `changeGuids` trigger.
* Replace the `updateLocalItems` trigger with an `apply_remote_items`
function to bulk upsert new and updated items.
* Replace the `structureToMerge` view with an
`applyNewLocalStructureOps` table that holds parents and positions
for moved items, and an `applyNewLocalStructure` trigger to update
them.
* Remove tombstones for revived items, update change counters, and flag
mirror items as merged directly in `update_local_items_in_places`,
instead of indirecting through temp tables.
* Don't mark items flagged for reupload as merged, since we'll write
them back to the mirror after upload.
* Use a scalar subquery instead of a join in the `localTags` view to
look up the tags root ID.
* Replace `relatedIdsToReupload` with a `Store::prepare` method that
flags all bookmarks with keyword-URL mismatches for reupload.
* Trigger frecency updates for origins once, not for every item.
* Remove two extra scans on `itemsAdded` and `itemsChanged` when
recording observer notifications for changed keywords.
* Notify all `bookmark-added` listeners in a single batch.
This also fixes some edge cases:
* Update root positions correctly after deleting a non-syncable root
or item.
* Keyword-URL mismatches may reupload more items than before, but now
ensure that all bookmarks with the same URL have the same keyword.
* Only set items with deduped GUIDs to `SYNC_STATUS_NORMAL` after
merging.
* Bump the last modified time for modified items only.
Differential Revision: https://phabricator.services.mozilla.com/D39889
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extra : moz-landing-system : lando
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