The backup-data refresh in the WebUI update chain shelled out to
`restic snapshots` once PER APP (dashboard, app-status) and once per
(host, app) (migrate) — every call a `sudo`+`restic` spawn that re-opens
and decrypts the repo. With N apps and L locations that's O(N·L) (app-status)
plus O(hosts·apps·L) (migrate) spawns on every update — the silent stall
after "Refreshed backup dashboard data...".
One `restic snapshots --json` already returns the whole repo, so fetch it
ONCE per location and derive the per-app / per-host / system views in jq.
Validated against a live restic 0.19 repo: the jq filter reproduces
`restic snapshots --tag <t> --host <h>` exactly (incl. empty-host = all
hosts, and newest = last), and count/latest extraction matches the old grep.
- dashboard: one primary-location fetch → all app tiles + system status
(was N snapshot calls + 1).
- app-status: one fetch per location → filter per app (was N×L calls);
also de-recursed into a flat app loop.
- migrate: filter the already-fetched per-location list (was a spawn per
host×app). Fixes a latent bug too — `grep -oc` over single-line JSON
always reported a count of 1; jq `length` is now accurate.
restic snapshot spawns per refresh drop from ~O(N·L + hosts·apps·L) to ~O(L).
`restic stats` (still run per location in locations + dashboard) is a
separate, non-multiplicative cost left untouched to preserve its semantics.
Signed-off-by: librelad <librelad@digitalangels.vip>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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