BackupEngine:
- fetchAssets() runs in Task.detached — prevents 100-500ms UI freeze during
PHFetchResult enumeration on large libraries
- Manifest JSON decode + ManifestIndex Set construction run in Task.detached
- pendingAssets filter runs in Task.detached — O(N) array filter off main thread
- Progress updates throttled to 8 Hz via ProgressThrottle — eliminates the
continuous SwiftUI full-tree redraws caused by per-byte upload callbacks
- bytesSoFar captured by value in upload closure — avoids mutable var capture
- reserveCapacity on manifestEntries array
- os_signpost intervals on FetchAssets, NASConnect, ManifestLoad,
BuildPendingQueue, UploadLoop, UploadFile for Instruments profiling
BackupStatusService:
- countSafe() marked nonisolated — runs in Task.detached off main actor,
keeping touch/animation responsive during PHFetchResult batch enumeration
- ManifestIndex JSON decode + Set construction run in Task.detached
- Bootstrap ManifestIndex(nasListing:) construction off main actor
- writeManifest JSON decode/encode/merge off main actor
- os_signpost intervals on Reconcile, ManifestLoad, CountSafe
Model types:
- ManifestIndex, ManifestEntry, PhotoAsset, BackupFilter marked Sendable —
safe to pass across task boundaries without warnings
Co-Authored-By: Kutesir <kutesir@provoc.ug>
Co-Authored-By: Sentry <sentry@provoc.ug>
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