This makes the deletion of BaseItemProviders, BaseItemImageInfos, and BaseItemMetadataFields happen in batch as a contiguous block so the lock isn't held across items, just before the bulk SaveChanges.
The FixIncorrectOwnerIdRelationships migration deletes all duplicate
items in a single DeleteItemsUnsafeFast -> DeleteItem(ids) call. Inside
DeleteItem, the owned-extras lookup used a raw HashSet.Contains, which EF
inlines as one SQL variable per id and overflows SQLite's variable limit
on large libraries. Use WhereOneOrMany so the id set is bound as a single
json_each parameter, like the rest of the method, making bulk deletes
work for unlimited library sizes.
Marc Brooks