fix: keep watch mode's tokens-by-model fresh when stats-cache.json is stale - #11
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… stale ClaudeUsageProvider.GetStatsCache only compared stats-cache.json's LastComputedDate (day granularity) to decide freshness, so it trusted Claude Code's own cache file for an entire day even if session transcripts had newer activity. This made the watch models view (and anything else sourced from StatsCache.ModelUsage) appear frozen while hours/today, which read transcripts directly, kept updating. Now freshness also compares actual write timestamps, falling back to rebuilding from session transcripts when they're newer than stats-cache.json. To avoid re-scanning the projects directory on every check, a new SessionActivityTracker maintains the latest session write time incrementally from DataService's existing FileSystemWatcher events instead of repeated directory scans.
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Summary
ClaudeUsageProvider.GetStatsCacheonly trustedstats-cache.json's day-granularityLastComputedDate, so it kept returning a stale snapshot all day even after new session activity, causingaimon watch modelsto look frozen whilehours/today(which read transcripts directly) kept updating.StatsCacheBuilder) when they're newer.SessionActivityTracker, fed incrementally byDataService's existing session-fileFileSystemWatcher, so the freshness check is an O(1) in-memory read instead of a full directory re-scan on every call.Test plan
dotnet build AIUsageMonitor.slnxdotnet test AIUsageMonitor.slnx(33/33 passing, including newClaudeUsageProviderTestscovering both the stale-rebuild and fresh-reuse paths)dotnet run --project src/AIUsageMonitor.Cli -- watch models --interval 5while generating new usage in Claude Code, confirm tokens-by-model updates within a few seconds