Only Wikipedia had version cleanup; every other curated map and non-Wikipedia
ZIM left its prior version on disk when a newer one installed, so users silently
accumulated orphaned content (potentially hundreds of GB). (#634)
The install paths already record each resource via InstalledResource
{resource_id, resource_type, version, file_path}, so the authoritative old-file
path for a resource is known. On install of a new version we now capture the
prior row before updateOrCreate repoints it, then delete the old file — gated
behind a pure, fully unit-tested decision function with strict safety rails:
- tracked-only: requires a prior InstalledResource row for the same
resource_id, so sideloaded/untracked files are never touched
- genuine replacement: old and new file paths must differ
- new-file-verified: the new file must be confirmed on disk first
- strictly-newer: a re-install or downgrade can't wipe a newer file
- within-storage-dir: the old path must resolve under the content store
ZIM cleanup deletes the old file directly (NOT via this.delete(), which would
drop the InstalledResource row by resource_id that updateOrCreate just
repointed) and rebuilds the Kiwix library only if a file was actually removed,
so its XML never references a deleted ZIM. Maps need no library step. Wikipedia
keeps its own existing cleanup path. All deletions are best-effort and logged;
a failure never breaks the install.
Closes#634
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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