# TowerOps - Network Monitoring & Alerting Platform
## Implementation Plan

## Overview
Multi-tenant network monitoring and alerting application for tracking network equipment health via ping monitoring.

## Core Requirements
1. User accounts (email as username)
2. Organizations (multi-tenant)
3. Organization membership with permission levels
4. Site hierarchy
5. Equipment management (IP-based)
6. Automated ping monitoring (5-minute intervals)
7. Alerting system

---

## Data Model Design

### Users
- `id` (binary_id, PK)
- `email` (string, unique, username)
- `hashed_password` (string)
- `confirmed_at` (utc_datetime, nullable)
- `inserted_at` / `updated_at` (utc_datetime)

### Organizations
- `id` (binary_id, PK)
- `name` (string)
- `slug` (string, unique) - for URLs
- `inserted_at` / `updated_at` (utc_datetime)

### OrganizationMemberships
- `id` (binary_id, PK)
- `organization_id` (binary_id, FK -> organizations)
- `user_id` (binary_id, FK -> users)
- `role` (enum: owner, admin, member, viewer)
- `inserted_at` / `updated_at` (utc_datetime)
- Unique constraint on (organization_id, user_id)

**Permission Levels:**
- `owner` - Full control, can delete org, manage all settings
- `admin` - Can manage users, sites, equipment, view all
- `member` - Can add/edit equipment, view sites
- `viewer` - Read-only access

### Sites
- `id` (binary_id, PK)
- `organization_id` (binary_id, FK -> organizations)
- `parent_site_id` (binary_id, FK -> sites, nullable) - for hierarchy
- `name` (string)
- `description` (text, nullable)
- `location` (string, nullable)
- `inserted_at` / `updated_at` (utc_datetime)

### Equipment
- `id` (binary_id, PK)
- `site_id` (binary_id, FK -> sites)
- `name` (string)
- `ip_address` (string)
- `description` (text, nullable)
- `status` (enum: up, down, unknown)
- `last_checked_at` (utc_datetime, nullable)
- `last_status_change_at` (utc_datetime, nullable)
- `monitoring_enabled` (boolean, default: true)
- `check_interval_seconds` (integer, default: 300) - 5 minutes
- `inserted_at` / `updated_at` (utc_datetime)

### MonitoringChecks (historical log)
- `id` (binary_id, PK)
- `equipment_id` (binary_id, FK -> equipment)
- `status` (enum: success, failure)
- `response_time_ms` (integer, nullable)
- `checked_at` (utc_datetime)
- Index on (equipment_id, checked_at)

### Alerts
- `id` (binary_id, PK)
- `equipment_id` (binary_id, FK -> equipment)
- `alert_type` (enum: equipment_down, equipment_up)
- `triggered_at` (utc_datetime)
- `acknowledged_at` (utc_datetime, nullable)
- `acknowledged_by_id` (binary_id, FK -> users, nullable)
- `resolved_at` (utc_datetime, nullable)
- `email_sent_at` (utc_datetime, nullable)
- `inserted_at` / `updated_at` (utc_datetime)

### OrganizationInvitations
- `id` (binary_id, PK)
- `organization_id` (binary_id, FK -> organizations)
- `email` (string)
- `role` (enum: admin, member, viewer) - cannot invite as owner
- `token` (string, unique) - secure random token for invite link
- `invited_by_id` (binary_id, FK -> users)
- `accepted_at` (utc_datetime, nullable)
- `accepted_by_id` (binary_id, FK -> users, nullable)
- `expires_at` (utc_datetime) - invites expire after 7 days
- `inserted_at` / `updated_at` (utc_datetime)

---

## Architecture Components

### 1. Authentication & Authorization

**Use Phoenix.LiveView built-in patterns:**
- Email/password authentication
- Session-based auth with LiveView
- Password reset via email

**Authorization Strategy:**
- Context-based permissions (organization-scoped)
- Plugs for organization membership verification
- LiveView mount hooks for permission checks
- Helper functions: `can?(user, :action, resource)`

### 2. Multi-Tenancy

**Organization Scoping:**
- All queries scoped by current_organization
- LiveView assigns: `@current_user`, `@current_organization`, `@current_membership`
- Router organization switcher for users in multiple orgs
- URL structure: `/orgs/:org_slug/sites`, `/orgs/:org_slug/equipment`

### 3. Monitoring System

**Background Job Architecture:**
- Use GenServer or DynamicSupervisor for monitoring workers
- One worker per equipment (or batched by site)
- Quantum or similar for scheduling (or custom OTP solution)
- Use `:gen_icmp` or System.cmd("ping") for ping checks

**Monitoring Flow:**
1. Worker wakes up every N seconds (configurable per equipment)
2. Pings equipment IP address
3. Records result in monitoring_checks table
4. Updates equipment status if changed
5. Creates alert if status transitions (up->down or down->up)
6. Broadcasts status change via PubSub for real-time UI updates

### 4. Real-Time Updates

**Phoenix PubSub Topics:**
- `organization:#{org_id}:equipment:#{equipment_id}` - Equipment status
- `organization:#{org_id}:alerts` - New alerts
- `organization:#{org_id}:sites` - Site changes

**LiveView Integration:**
- Subscribe to relevant topics on mount
- Handle PubSub messages to update assigns
- Stream-based updates for lists

### 5. UI Structure

**LiveView Pages:**
- `/login`, `/register` - Authentication
- `/orgs` - Organization list/switcher
- `/orgs/:slug/dashboard` - Overview, active alerts, recent changes
- `/orgs/:slug/sites` - Site hierarchy tree view
- `/orgs/:slug/sites/:id` - Site detail with equipment list
- `/orgs/:slug/equipment` - All equipment list
- `/orgs/:slug/equipment/:id` - Equipment detail with check history
- `/orgs/:slug/alerts` - Alert history
- `/orgs/:slug/settings` - Org settings, members

**Components:**
- Organization switcher (header)
- Site tree navigator
- Equipment status badge
- Alert list/feed
- Permission-based action buttons

---

## Implementation Stages

### Stage 1: Foundation & Authentication
**Goal**: User authentication and basic org structure
**Success Criteria**:
- Users can register/login with email
- Users can create organizations
- Users can switch between organizations
- Basic navigation structure
- Tests passing

**Detailed Tasks**:

#### 1.1 User Authentication
- [ ] Run `mix phx.gen.auth Accounts User users` to scaffold auth system
- [ ] Review and customize generated code (email as username)
- [ ] Update user registration to create first organization
- [ ] Add tests for auth flows

**Files Created**:
- `lib/towerops/accounts.ex` - User context
- `lib/towerops/accounts/user.ex` - User schema
- `lib/towerops/accounts/user_token.ex` - Session tokens
- `lib/towerops_web/user_auth.ex` - Auth plugs
- `lib/towerops_web/controllers/user_session_controller.ex`
- `lib/towerops_web/controllers/user_registration_controller.ex`
- `lib/towerops_web/controllers/user_reset_password_controller.ex`
- `lib/towerops_web/controllers/user_settings_controller.ex`
- Migrations for users and user_tokens tables

#### 1.2 Organizations & Memberships
- [ ] Create migration: `mix ecto.gen.migration create_organizations`
- [ ] Create migration: `mix ecto.gen.migration create_organization_memberships`
- [ ] Create migration: `mix ecto.gen.migration create_organization_invitations`
- [ ] Create `lib/towerops/organizations.ex` context
- [ ] Create `lib/towerops/organizations/organization.ex` schema
- [ ] Create `lib/towerops/organizations/membership.ex` schema
- [ ] Create `lib/towerops/organizations/invitation.ex` schema
- [ ] Add slug generation for organizations (use Ecto changeset)
- [ ] Add tests for organizations context

**Migration Details**:
```elixir
# organizations table
create table(:organizations, primary_key: false) do
  add :id, :binary_id, primary_key: true
  add :name, :string, null: false
  add :slug, :string, null: false
  timestamps(type: :utc_datetime)
end
create unique_index(:organizations, [:slug])

# organization_memberships table
create table(:organization_memberships, primary_key: false) do
  add :id, :binary_id, primary_key: true
  add :organization_id, references(:organizations, type: :binary_id, on_delete: :delete_all)
  add :user_id, references(:users, type: :binary_id, on_delete: :delete_all)
  add :role, :string, null: false
  timestamps(type: :utc_datetime)
end
create unique_index(:organization_memberships, [:organization_id, :user_id])
create index(:organization_memberships, [:user_id])
```

#### 1.3 Multi-Org Navigation
- [ ] Create organization switcher LiveView component
- [ ] Add current_organization plug to router
- [ ] Create `/orgs` LiveView (list user's organizations)
- [ ] Create `/orgs/new` LiveView (create organization)
- [ ] Update router with organization-scoped routes
- [ ] Add breadcrumb navigation component
- [ ] Add tests for organization switching

**Router Structure**:
```elixir
scope "/", ToweropsWeb do
  pipe_through [:browser, :require_authenticated_user]

  live "/orgs", OrgLive.Index
  live "/orgs/new", OrgLive.New
end

scope "/orgs/:org_slug", ToweropsWeb do
  pipe_through [:browser, :require_authenticated_user, :load_current_organization]

  live "/", DashboardLive
  # Future: sites, equipment, etc.
end
```

#### 1.4 Authorization System
- [ ] Create `lib/towerops/organizations/policy.ex` for permission checks
- [ ] Add `can?/3` helper function
- [ ] Create `:load_current_organization` plug
- [ ] Add permission checks to LiveView mount callbacks
- [ ] Add tests for authorization

**Permission Matrix**:
| Action | Owner | Admin | Member | Viewer |
|--------|-------|-------|--------|--------|
| View org | ✓ | ✓ | ✓ | ✓ |
| Edit org settings | ✓ | ✓ | ✗ | ✗ |
| Delete org | ✓ | ✗ | ✗ | ✗ |
| Manage members | ✓ | ✓ | ✗ | ✗ |
| Add/edit equipment | ✓ | ✓ | ✓ | ✗ |
| View equipment | ✓ | ✓ | ✓ | ✓ |

#### 1.5 Basic UI & Layouts
- [ ] Update `layouts.ex` to include org switcher in header
- [ ] Create organization badge component
- [ ] Style navigation with Tailwind
- [ ] Add flash message styling
- [ ] Ensure responsive design

### Stage 2: Sites & Equipment Management
**Goal**: CRUD for sites and equipment
**Success Criteria**:
- Users can create/edit/delete sites
- Sites can have parent sites (hierarchy)
- Users can add equipment to sites
- Equipment has IP address and basic info

**Tasks**:
1. Generate sites schema and LiveViews
2. Build site hierarchy tree component
3. Generate equipment schema and LiveViews
4. Add IP address validation
5. Permission checks on all actions

### Stage 3: Monitoring System ✓ COMPLETE
**Goal**: Automated ping monitoring with TimescaleDB
**Success Criteria**:
- ✓ Equipment is pinged at configurable intervals
- ✓ Status updates in real-time via PubSub
- ✓ Monitoring checks are logged
- ✓ TimescaleDB hypertable for efficient time-series storage
- ✓ Automatic data retention and compression
- ✓ Continuous aggregates for dashboard metrics

**Tasks**:
1. ✓ Design monitoring worker architecture (GenServer + DynamicSupervisor)
2. ✓ Implement ping functionality (System.cmd with OS-specific args)
3. ✓ Create monitoring_checks schema with TimescaleDB hypertable
4. ✓ Build GenServer workers for monitoring
5. ✓ Add PubSub broadcasting
6. ✓ Update LiveView to receive real-time updates
7. ✓ Configure TimescaleDB retention policies
8. ✓ Create continuous aggregates for metrics

**Completed**: 2025-12-21
**Files Created**:
- `lib/towerops/monitoring/check.ex` - MonitoringCheck schema
- `lib/towerops/monitoring.ex` - Monitoring context
- `lib/towerops/monitoring/ping.ex` - Ping functionality
- `lib/towerops/monitoring/equipment_monitor.ex` - GenServer for monitoring individual equipment
- `lib/towerops/monitoring/supervisor.ex` - Supervisor for managing monitor workers
- `priv/repo/migrations/*_create_monitoring_checks.exs` - Database migration with TimescaleDB hypertable

**TimescaleDB Integration**:
- `monitoring_checks` converted to hypertable partitioned by `checked_at`
- Retention policy: Keep raw data for 90 days, then automatically delete
- Compression policy: Compress chunks older than 7 days
- Continuous aggregates: Hourly and daily rollups for dashboard performance

### Stage 4: Alerting ✓ COMPLETE
**Goal**: Alert generation and management
**Success Criteria**:
- ✓ Alerts created on status changes
- ✓ Users can view alert history
- ✓ Users can acknowledge alerts
- ✓ Real-time alert notifications via PubSub

**Tasks**:
1. ✓ Create alerts schema
2. ✓ Build alert creation logic in monitoring workers
3. ✓ Create alert LiveView pages
4. ✓ Add alert acknowledgment
5. ✓ Alert notifications in UI
6. ✓ Dashboard integration with active alerts

**Completed**: 2025-12-21
**Files Created**:
- `priv/repo/migrations/*_create_alerts.exs` - Alerts table migration
- `lib/towerops/alerts/alert.ex` - Alert schema
- `lib/towerops/alerts.ex` - Alerts context
- `lib/towerops_web/live/alert_live/index.ex` - Alerts listing page
- `lib/towerops_web/live/alert_live/index.html.heex` - Alerts UI

**Files Modified**:
- `lib/towerops/monitoring/equipment_monitor.ex` - Alert creation on status changes
- `lib/towerops_web/live/dashboard_live.ex` - Active alerts display
- `lib/towerops_web/live/dashboard_live.html.heex` - Dashboard UI updates
- `lib/towerops_web/router.ex` - Alert routes

### Stage 5: Polish & Production ✓ COMPLETE
**Goal**: Production-ready application
**Success Criteria**:
- ✓ All tests passing (154 tests, 60.83% coverage)
- ✓ Polished UI with Tailwind (removed daisyUI, custom components)
- ✓ Email notifications configured
- ✓ Production deployment ready

**Tasks**:
1. ✓ Comprehensive test coverage (100% on core business logic)
2. ✓ UI/UX improvements (Dashboard redesigned with custom Tailwind)
3. ✓ Email alert notifications (SMTP-based, sent to owners/admins)
4. ✓ Performance optimization (Added monitoring_enabled index)
5. ✓ Documentation (Complete DEPLOYMENT.md guide)

**Completed**: 2025-12-24
**Files Created**:
- `lib/towerops/alerts/alert_notifier.ex` - Email notification service
- `DEPLOYMENT.md` - Comprehensive production deployment guide
- `priv/repo/migrations/*_add_email_sent_at_to_alerts.exs` - Email tracking
- `priv/repo/migrations/*_add_monitoring_enabled_index.exs` - Performance optimization

**Files Modified**:
- `lib/towerops/alerts/alert.ex` - Added email_sent_at field
- `lib/towerops/alerts.ex` - Added send_alert_notification/1 function
- `lib/towerops/organizations.ex` - Added list_organization_notification_recipients/1
- `lib/towerops/monitoring/equipment_monitor.ex` - Integrated email sending
- `lib/towerops_web/live/dashboard_live.html.heex` - Modern Tailwind UI

**Email Notification System**:
- Sends emails to organization owners and admins
- Equipment down alerts with details
- Equipment recovery notifications
- Disabled in test environment to avoid connection issues
- Tracks email_sent_at timestamp

**UI Improvements**:
- Removed all daisyUI classes
- Custom Tailwind components with dark mode support
- Modern card-based dashboard layout
- Proper semantic color scheme (zinc, blue, red, green, amber)
- Improved accessibility and responsiveness

**Performance Optimizations**:
- Added index on equipment.monitoring_enabled for fast filtering
- All existing queries already optimized with proper indexes
- TimescaleDB compression and retention in production

**Production Readiness**:
- Complete deployment documentation
- Environment-specific configurations
- SSL/TLS setup guide
- Docker and systemd examples
- Database backup procedures
- Troubleshooting guide

### Stage 6: Distributed Monitoring Agents (Future)
**Goal**: Deploy-able Rust-based monitoring agents for internal network monitoring
**Status**: PLANNED - Not yet started

**Overview**:
Customer-deployable Rust binary that runs inside customer networks to monitor equipment from within their own infrastructure. Agents authenticate using deployment keys and report monitoring results back to the TowerOps platform.

**Success Criteria**:
- Rust agent binary can be deployed on customer networks (Linux, Windows, macOS)
- Agent authenticates with deployment key tied to organization
- Agent pings equipment reachable on local network
- Results reported back to TowerOps API
- Equipment can be configured to use agent-based or platform-based monitoring
- Agent status visible in TowerOps dashboard

**Architecture**:
- **Rust Agent**: Lightweight binary for customer deployment
  - Ping functionality using OS-native ICMP
  - Configurable check intervals
  - Local caching/queue for offline resilience
  - Secure API communication over HTTPS
  - Auto-update capability

- **Deployment Keys**: Scoped API credentials
  - Per-organization deployment keys
  - Limited scope (can only submit monitoring results)
  - Revocable from TowerOps dashboard
  - Multiple keys per organization for different sites/networks

- **API Endpoints**: Backend support for agent communication
  - POST /api/v1/monitoring/checks - Submit monitoring results
  - GET /api/v1/monitoring/config - Fetch equipment list for agent
  - Authentication via deployment key header

**Tasks**:
1. Design deployment key schema and API
2. Create agent registration and key management in TowerOps
3. Build Rust monitoring agent
   - ICMP ping implementation
   - API client for result submission
   - Configuration management
   - Error handling and retry logic
4. Add equipment assignment to agents
5. Agent status monitoring in dashboard
6. Documentation for agent deployment

**Database Changes Needed**:
```elixir
# deployment_keys table
- id (binary_id)
- organization_id (FK)
- name (string) - Human-readable name for the key
- key_hash (string) - Hashed version of the key
- last_used_at (utc_datetime)
- created_by_id (FK -> users)
- revoked_at (utc_datetime, nullable)

# monitoring_agents table
- id (binary_id)
- organization_id (FK)
- deployment_key_id (FK)
- name (string)
- version (string) - Agent version
- last_seen_at (utc_datetime)
- status (enum: active, inactive, error)

# equipment table additions
- monitoring_agent_id (FK -> monitoring_agents, nullable)
- monitoring_source (enum: platform, agent) - Where monitoring happens
```

**Notes**:
- This is a significant feature and will be implemented much later
- Current platform-based monitoring (Stage 3) remains as fallback
- Allows monitoring of internal/private networks not accessible from internet
- Agent runs continuously, not triggered from platform

---

## Technical Decisions

### Database
- PostgreSQL with Ecto
- Use binary_id (UUID) for all primary keys (already configured)
- Indexes on foreign keys and frequently queried fields

**TimescaleDB for Time-Series Data**:
- TimescaleDB extension enabled on PostgreSQL
- `monitoring_checks` table converted to hypertable
- Automatic partitioning by time (checked_at column)
- Retention policy: 90 days for raw data
- Compression policy: Compress chunks older than 7 days
- Continuous aggregates for dashboard performance:
  - `monitoring_checks_hourly` - Hourly rollups (avg response time, success rate)
  - `monitoring_checks_daily` - Daily rollups for long-term trends

**Why TimescaleDB**:
- Built as PostgreSQL extension (not separate database)
- Works seamlessly with Ecto
- Optimized for time-series queries
- Automatic data lifecycle management
- Fast aggregations for dashboards
- Scales to millions of monitoring checks

### Background Jobs
**Options:**
1. Custom OTP solution with GenServer + Process.send_after
2. Quantum scheduler
3. Oban (more heavyweight but robust)

**Recommendation**: Start with custom OTP, migrate to Oban if needed

### Real-time Communication
- Phoenix PubSub for server-side messaging
- LiveView for UI updates
- No WebSocket client code needed

### Ping Implementation
**Options:**
1. `:gen_icmp` library (requires raw sockets, might need permissions)
2. System.cmd("ping") - simpler, cross-platform
3. HTTP health checks (future enhancement)

**Recommendation**: System.cmd("ping") for MVP, abstract for future protocols

---

## Decisions Made

1. **Email notifications**: ✓ Yes - Users receive email alerts on status changes
2. **Multi-org users**: ✓ Yes - Users can belong to multiple organizations
3. **Invite system**: ✓ Email invitation system (secure token-based invites)
4. **Check intervals**: ✓ Customizable per equipment (stored in equipment.check_interval_seconds)

## Additional Schema Needed

Based on decisions:
- **OrganizationInvitations** table for email invite workflow
- **email_sent_at** field in Alerts for tracking email delivery

## Open Questions

1. **Alert escalation**: Any escalation policies (e.g., page admin if down > X minutes)?
2. **Retention**: How long to keep monitoring_checks history?
3. **Equipment types**: Just ping for now, or plan for SNMP, HTTP, etc.?
4. **Site hierarchy depth**: Any limit on site nesting levels?

---

## Status: Stage 5 Complete - Production Ready! 🚀

**Completed Stages**:
- ✓ Stage 1: Foundation & Authentication (2025-12-21)
- ✓ Stage 2: Sites & Equipment Management (2025-12-21)
- ✓ Stage 3: Monitoring System with TimescaleDB (2025-12-21)
- ✓ Stage 4: Alerting (2025-12-21)
- ✓ Stage 5: Polish & Production (2025-12-24)

**Current Status**: All tests passing (154/154), production-ready

**Features Implemented**:
- Multi-tenant organizations with role-based access
- Hierarchical site management
- Equipment monitoring with ping checks
- TimescaleDB time-series optimization (production-ready)
- Automatic alerting on status changes
- Email notifications to owners/admins
- Real-time dashboard with LiveView
- Alert acknowledgment system
- Modern Tailwind UI (no daisyUI)
- Comprehensive deployment documentation
- Performance optimizations (database indexes)

**Next Steps**:
- Stage 6: Distributed Monitoring Agents (Future - see above for details)
- Deploy to production following DEPLOYMENT.md guide

Last updated: 2025-12-24
