nora/SESSION_NOTES.md

# NORA Development Session Notes

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## 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`

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### 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
```

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