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SESSION_NOTES.md

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+# NORA Development Session Notes
+
+---
+
+## 2026-01-26 - Dashboard Expansion
+
+### Iteration 1: Planning & Exploration
+- Received detailed implementation plan for dashboard expansion
+- Explored codebase structure using Task agent
+- Identified key files to modify:
+  - `main.rs` - AppState
+  - `ui/api.rs`, `ui/mod.rs`, `ui/components.rs`, `ui/templates.rs`
+  - `registry/docker.rs`, `npm.rs`, `maven.rs`, `cargo_registry.rs`
+
+### Iteration 2: Infrastructure (Phase 1)
+- Created `src/dashboard_metrics.rs`:
+  - `DashboardMetrics` struct with AtomicU64 counters
+  - Per-registry tracking (docker, npm, maven, cargo, pypi)
+  - `record_download()`, `record_upload()`, `record_cache_hit/miss()`
+  - `cache_hit_rate()` calculation
+
+- Created `src/activity_log.rs`:
+  - `ActionType` enum: Pull, Push, CacheHit, ProxyFetch
+  - `ActivityEntry` struct with timestamp, action, artifact, registry, source
+  - `ActivityLog` with RwLock<VecDeque> (bounded to 50 entries)
+
+### Iteration 3: AppState Update (Phase 2)
+- Updated `main.rs`:
+  - Added `mod activity_log` and `mod dashboard_metrics`
+  - Extended `AppState` with `metrics: DashboardMetrics` and `activity: ActivityLog`
+  - Initialized in `run_server()`
+
+### Iteration 4: API Endpoint (Phase 3)
+- Updated `ui/api.rs`:
+  - Added structs: `DashboardResponse`, `GlobalStats`, `RegistryCardStats`, `MountPoint`
+  - Implemented `api_dashboard()` - aggregates all metrics, storage stats, activity
+
+- Updated `ui/mod.rs`:
+  - Added route `/api/ui/dashboard`
+  - Modified `dashboard()` handler to use new response
+
+### Iteration 5: Dark Theme UI (Phase 4)
+- Updated `ui/components.rs` with ~400 new lines:
+  - `layout_dark()` - dark theme wrapper (#0f172a background)
+  - `sidebar_dark()`, `header_dark()` - dark theme navigation
+  - `render_global_stats()` - 5-column stats grid
+  - `render_registry_card()` - extended card with metrics
+  - `render_mount_points_table()` - registry paths and proxies
+  - `render_activity_row()`, `render_activity_log()` - activity display
+  - `render_polling_script()` - 5-second auto-refresh JS
+
+### Iteration 6: Dashboard Template (Phase 5)
+- Updated `ui/templates.rs`:
+  - Refactored `render_dashboard()` to accept `DashboardResponse`
+  - Added uptime display, global stats, registry cards grid
+  - Added mount points table and activity log
+  - Added `format_relative_time()` helper
+
+### Iteration 7: Registry Instrumentation (Phase 6)
+- `registry/docker.rs`:
+  - `download_blob()` - record download + cache hit + activity
+  - `get_manifest()` - record download + cache hit + activity
+  - `upload_blob()` - record upload + activity
+  - `put_manifest()` - record upload + activity
+
+- `registry/npm.rs`:
+  - Cache hit tracking for local storage
+  - Cache miss + proxy fetch tracking
+
+- `registry/maven.rs`:
+  - `download()` - cache hit/miss + activity
+  - `upload()` - record upload + activity
+
+- `registry/cargo_registry.rs`:
+  - `download()` - record download + activity
+
+### Iteration 8: Build & Test
+- `cargo build` - compiled successfully with minor warnings
+- Fixed warnings:
+  - Removed unused `RegistryStats` import
+  - Added `#[allow(dead_code)]` to `stat_card()`
+- `cargo test` - all 75 tests passed
+
+### Iteration 9: Server Testing
+- Started server: `cargo run --release --bin nora`
+- Tested endpoints:
+  ```
+  GET /health - OK
+  GET /api/ui/dashboard - returns full metrics JSON
+  GET /ui/ - dark theme dashboard HTML
+  GET /v2/test/manifests/v1 - triggered Docker metrics
+  GET /npm/lodash/-/lodash-4.17.21.tgz - triggered npm proxy metrics
+  ```
+- Verified metrics tracking:
+  - Downloads: 3 (2 Docker + 1 npm)
+  - Cache hit rate: 66.67%
+  - Activity log populated with Pull, ProxyFetch events
+
+### Iteration 10: Git Commit & Push
+- Staged 11 files (2 new, 9 modified)
+- Commit: `93f9655 Add dashboard metrics, activity log, and dark theme`
+- Pushed to `origin/main`
+
+### Iteration 11: Documentation
+- Updated `TODO.md` with v0.2.1 section
+- Created this `SESSION_NOTES.md`
+
+---
+
+### Key Decisions Made
+1. **In-memory metrics** - AtomicU64 for thread-safety, reset on restart
+2. **Bounded activity log** - 50 entries max, oldest evicted
+3. **Polling over WebSocket** - simpler, 5-second interval sufficient
+4. **Dark theme only for dashboard** - registry list pages keep light theme
+
+### Files Changed Summary
+```
+New:
+  nora-registry/src/activity_log.rs
+  nora-registry/src/dashboard_metrics.rs
+
+Modified:
+  nora-registry/src/main.rs                    (+8 lines)
+  nora-registry/src/registry/cargo_registry.rs (+13 lines)
+  nora-registry/src/registry/docker.rs         (+47 lines)
+  nora-registry/src/registry/maven.rs          (+36 lines)
+  nora-registry/src/registry/npm.rs            (+29 lines)
+  nora-registry/src/ui/api.rs                  (+154 lines)
+  nora-registry/src/ui/components.rs           (+394 lines)
+  nora-registry/src/ui/mod.rs                  (+5 lines)
+  nora-registry/src/ui/templates.rs            (+180/-79 lines)
+
+Total: ~1004 insertions, 79 deletions
+```
+
+### Useful Commands
+```bash
+# Start server
+cargo run --release --bin nora
+
+# Test dashboard
+curl http://127.0.0.1:4000/api/ui/dashboard
+
+# View UI
+open http://127.0.0.1:4000/ui/
+
+# Trigger metrics
+curl http://127.0.0.1:4000/v2/test/manifests/v1
+curl http://127.0.0.1:4000/npm/lodash/-/lodash-4.17.21.tgz -o /dev/null
+```
+
+---