feat(migration): drop legacy unique index on folders table#883
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feat(migration): drop legacy unique index on folders table#883
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What
Drop the legacy unique index
folders_plainname_parentid_keyfrom thefolderstable, now that the replacement indexfolders_parentuuid_plainname_uniquehas been deployed in PR #882.Why
1. Index is no longer used
The legacy index has not been scanned since 2026-01-07, when the optimized
idx_folders_user_parentuuid_plainname_not_deleted_removedindex was introduced.2. Redundant uniqueness enforcement
With PR #882 merged, we now have a proper unique constraint on
(parent_uuid, plain_name)that:findByNameAndParentUuid)The legacy index on
(plain_name, parent_id)is now fully redundant.3. Write performance impact
Despite not being scanned, the index is still maintained on every write operation.
4. Disk space recovery
Dropping this index reclaims 5,940 MB of disk space.
How
Migration uses
DROP INDEX CONCURRENTLYto avoid table locks: