arr_full_rescan.sh, arr_cache_prefill.sh, and arr_rescan_monitor.sh were
missing the standard SAFEGUARDS header section other Arrs_Stack/Tools
scripts have. Also: arr_cache_prefill.sh now checks for an active rescan
before fetching, instead of doing a live fetch that arr_cache_write()
would just refuse to persist anyway -- avoids wasted API calls every
30min during a long rescan. arr_rescan_monitor.sh was also missing an
actual root check despite writing cache files; added it to match
convention rather than just document a safeguard that wasn't there.
A direct arr_cache_write() call mid-rescan wrote a partial snapshot that
looked like real data loss to every consumer of the cache. The guard now
lives in arr_cache_write() itself so every caller is protected, not just
arr_get_tracked_data(). arr_rescan_monitor.sh closes the resulting gap for
rescans triggered outside arr_full_rescan.sh's own trigger-and-wait path.
Gmer4Lfe