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a0f2000968
Add indexes to support permission-filtered queries at scale (TASK-486). - idx_mca_collection: reverse lookup on member_collection_access for cascade cleanup when collections are deleted - idx_collections_system: partial index on (workspace_id, is_system) for fast system collection lookups in VisibleCollectionIDs - idx_wm_user: index on workspace_members(user_id) for user deletion cascade and cross-workspace membership queries