# Server Application

Enterprise-grade Node.js backend for Claude Code agent monitoring with real-time WebSocket updates.

![Claude Code](https://img.shields.io/badge/Claude_Code-orange?style=flat-square&logo=claude&logoColor=white)
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---

## Table of Contents

- [Overview](#overview)
- [Architecture](#architecture)
- [Database Design](#database-design)
- [API Reference](#api-reference)
- [WebSocket Protocol](#websocket-protocol)
- [Hook Processing](#hook-processing)
- [Pricing System](#pricing-system)
- [Data Flow](#data-flow)
- [Error Handling](#error-handling)
- [Performance](#performance)
- [Testing](#testing)
- [Deployment](#deployment)
- [Configuration](#configuration)

---

## Overview

The server is a lightweight Express application that:

1. **Receives hook events** from Claude Code via HTTP POST (stdin → hook-handler.js → server)
2. **Persists data** in SQLite database with schema migrations
3. **Broadcasts updates** to connected web clients via WebSocket
4. **Serves REST API** for sessions, agents, events, stats, analytics, pricing, workflows, settings, and docs
5. **Manages pricing rules** for cost calculation and attribution

```mermaid
graph TB
    subgraph "Claude Code Process"
        CC[Claude Code CLI]
        Hooks[Hook System]
        HH[hook-handler.js]
    end
    
    subgraph "Server Process :4820"
        Express[Express Server]
        HookRouter[Hook Router]
        APIRouter[API Router]
        WSServer[WebSocket Server]
        DB[(SQLite DB)]
    end
    
    subgraph "Clients"
        Browser[Web Browser]
        MCP[MCP Clients]
    end
    
    CC --> Hooks
    Hooks -->|stdin JSON| HH
    HH -->|HTTP POST| HookRouter
    HookRouter --> DB
    HookRouter --> WSServer
    
    Browser -->|HTTP GET| APIRouter
    APIRouter --> DB
    
    WSServer -->|Real-time events| Browser
    MCP -->|HTTP| APIRouter
    
    style Express fill:#000000,color:#fff
    style DB fill:#003B57,color:#fff
    style WSServer fill:#F59E0B
```

---

## Architecture

### Server Structure

```mermaid
graph TB
    subgraph "Entry Point"
        Index[index.js Server bootstrap]
    end
    
    subgraph "Core Modules"
        DB[db.js SQLite + prepared stmts]
        WS[websocket.js WebSocket manager]
        Compat[compat-sqlite.js Fallback for Node 22.5+]
    end
    
    subgraph "Routes"
        Hooks[routes/hooks.js POST /api/hooks/event]
        Sessions[routes/sessions.js /api/sessions]
        Agents[routes/agents.js /api/agents]
        Events[routes/events.js GET /api/events]
        Stats[routes/stats.js GET /api/stats]
        Analytics[routes/analytics.js GET /api/analytics]
        Pricing[routes/pricing.js /api/pricing*]
        Settings[routes/settings.js /api/settings*]
        Workflows[routes/workflows.js /api/workflows*]
        RemoteSources[routes/remote-sources.js /api/remote-sources*]
        OpenAPI[openapi.js + openapi-extra/ + Swagger + lib/redoc.js /api/openapi.json /api/docs /api/redoc]
    end
    
    subgraph "Tests"
        TestFiles[__tests__/api.test.js Integration tests]
    end
    
    Index --> DB
    Index --> WS
    Index --> Hooks
    Index --> Sessions
    Index --> Agents
    Index --> Events
    Index --> Stats
    Index --> Analytics
    Index --> Pricing
    Index --> Settings
    Index --> Workflows
    Index --> RemoteSources
    Index --> OpenAPI
    
    Hooks --> DB
    Sessions --> DB
    Agents --> DB
    Pricing --> DB
    
    Hooks --> WS
    
    DB -.->|Node 22.5+| Compat
    
    style Index fill:#339933
    style DB fill:#003B57,color:#fff
    style WS fill:#F59E0B
```

### Directory Structure

```
server/
├── index.js               # Express app + server bootstrap
├── db.js                  # SQLite connection + prepared statements
├── websocket.js           # WebSocket server + broadcast
├── compat-sqlite.js       # Fallback for node:sqlite (Node 22.5+)
│
├── routes/
│   ├── hooks.js           # Hook ingestion endpoints
│   ├── sessions.js        # Session CRUD API
│   ├── agents.js          # Agent CRUD API
│   ├── events.js          # Event list API
│   ├── stats.js           # Dashboard stats API
│   ├── analytics.js       # Analytics aggregate API
│   ├── pricing.js         # Pricing rules + cost API
│   ├── settings.js        # Ops/settings API
│   └── workflows.js       # Workflow intelligence API
│
├── openapi.js             # OpenAPI 3.0.3 spec generator (createOpenApiSpec)
├── openapi-extra/         # Supplementary OpenAPI fragments merged into the spec
│   ├── cc-config.js       #   /api/cc-config/* paths + schemas
│   ├── push.js            #   /api/push/* paths + schemas
│   ├── run.js             #   /api/run/* paths + schemas
│   └── misc.js            #   remaining route groups
│
├── lib/
│   └── redoc.js           # Serves ReDoc reference (/api/redoc) + self-hosted bundle
│
└── __tests__/
    └── api.test.js        # Integration tests
```

---

## Database Design

### Schema Overview

```mermaid
erDiagram
    sessions ||--o{ agents : "has many"
    agents ||--o{ tool_executions : "has many"
    sessions ||--o{ notifications : "has many"
    
    sessions {
        integer id PK
        text session_id UK
        text model
        text status
        real total_cost
        text created_at
        text updated_at
    }
    
    agents {
        integer id PK
        text agent_id UK
        text session_id FK
        text agent_type
        text status
        text current_tool
        integer input_tokens
        integer output_tokens
        real cost
        text created_at
        text updated_at
    }
    
    tool_executions {
        integer id PK
        text agent_id FK
        text tool_name
        integer duration_ms
        boolean success
        text error_message
        text created_at
    }
    
    notifications {
        integer id PK
        text session_id FK
        text notification_type
        text message
        text created_at
    }
    
    pricing_rules {
        integer id PK
        text pattern UK
        real input_cost_per_1m
        real output_cost_per_1m
        text created_at
    }
```

### Table Definitions

#### `sessions`

Tracks Claude Code sessions (one per CLI invocation or agent task).

```sql
CREATE TABLE sessions (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    session_id TEXT UNIQUE NOT NULL,
    model TEXT,
    status TEXT DEFAULT 'active',
    total_cost REAL DEFAULT 0,
    source TEXT NOT NULL DEFAULT 'local',   -- data source: 'local' or a remote_sources.id
    created_at TEXT DEFAULT (datetime('now')),
    updated_at TEXT DEFAULT (datetime('now'))
);

CREATE INDEX idx_sessions_session_id ON sessions(session_id);
CREATE INDEX idx_sessions_status ON sessions(status);
CREATE INDEX idx_sessions_updated_at ON sessions(updated_at DESC);
CREATE INDEX idx_sessions_source ON sessions(source);   -- powers the ?sources= data-scope filter
```

The `source` column is added migration-safe (additive `ALTER TABLE ... NOT NULL DEFAULT 'local'`), so every historical row keeps reading exactly as before; only sessions pulled from a configured remote carry a non-`local` source id.

#### `agents`

Tracks individual agents (main agent, explore, task, code-review, etc.).

```sql
CREATE TABLE agents (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    agent_id TEXT UNIQUE NOT NULL,
    session_id TEXT NOT NULL,
    agent_type TEXT,
    status TEXT DEFAULT 'running',
    current_tool TEXT,
    input_tokens INTEGER DEFAULT 0,
    output_tokens INTEGER DEFAULT 0,
    cost REAL DEFAULT 0,
    created_at TEXT DEFAULT (datetime('now')),
    updated_at TEXT DEFAULT (datetime('now')),
    FOREIGN KEY (session_id) REFERENCES sessions(session_id)
);

CREATE INDEX idx_agents_agent_id ON agents(agent_id);
CREATE INDEX idx_agents_session_id ON agents(session_id);
CREATE INDEX idx_agents_status ON agents(status);
```

#### `tool_executions`

Records each tool call (bash, view, edit, grep, etc.).

```sql
CREATE TABLE tool_executions (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    agent_id TEXT NOT NULL,
    tool_name TEXT NOT NULL,
    duration_ms INTEGER,
    success INTEGER DEFAULT 1,
    error_message TEXT,
    created_at TEXT DEFAULT (datetime('now')),
    FOREIGN KEY (agent_id) REFERENCES agents(agent_id)
);

CREATE INDEX idx_tools_agent_id ON tool_executions(agent_id);
CREATE INDEX idx_tools_created_at ON tool_executions(created_at DESC);
```

#### `notifications`

Stores system notifications (backgroundTaskComplete, etc.).

```sql
CREATE TABLE notifications (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    session_id TEXT NOT NULL,
    notification_type TEXT NOT NULL,
    message TEXT,
    created_at TEXT DEFAULT (datetime('now')),
    FOREIGN KEY (session_id) REFERENCES sessions(session_id)
);

CREATE INDEX idx_notifications_session_id ON notifications(session_id);
```

#### `pricing_rules`

Custom pricing rules for model pattern matching.

```sql
CREATE TABLE pricing_rules (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    pattern TEXT UNIQUE NOT NULL,
    input_cost_per_1m REAL NOT NULL,
    output_cost_per_1m REAL NOT NULL,
    created_at TEXT DEFAULT (datetime('now'))
);
```

#### `remote_sources`

Configured remote machines whose Claude Code history the dashboard pulls over SSH (see [Remote Data Sources](#remote-data-sources)). Config + operational status only — **no secrets** are stored; authentication defers to the host SSH stack.

```sql
CREATE TABLE remote_sources (
    id TEXT PRIMARY KEY,          -- also stamped onto sessions.source
    label TEXT NOT NULL,
    host TEXT NOT NULL,           -- ssh destination (user@host or ~/.ssh/config alias)
    ssh_port INTEGER,
    identity_file TEXT,           -- optional path to a key the user already controls
    remote_home TEXT,             -- remote home holding ~/.claude/projects
    enabled INTEGER NOT NULL DEFAULT 1,
    status TEXT NOT NULL DEFAULT 'idle',   -- idle | syncing | ok | error
    last_error TEXT,
    last_sync_at TEXT,
    last_sync_counts TEXT,        -- JSON import counters from the last sync
    created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now')),
    updated_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now'))
);
```

### Database Module (db.js)

```mermaid
graph TB
    subgraph "db.js Exports"
        DB[db object SQLite connection]
        Stmts[stmts object Prepared statements]
        Init[initDatabase Schema and migrations]
    end
    
    subgraph "Prepared Statements"
        Sessions[Session queries findSession createSession etc]
        Agents[Agent queries findAgent updateAgent etc]
        Tools[Tool queries createToolExecution etc]
        Pricing[Pricing queries createPricingRule etc]
    end
    
    Init --> DB
    DB --> Stmts
    Stmts --> Sessions
    Stmts --> Agents
    Stmts --> Tools
    Stmts --> Pricing
    
    style DB fill:#003B57,color:#fff
    style Init fill:#10B981
```

**Key Functions:**

```javascript
// Initialize database (create tables, indexes, defaults)
initDatabase();

// Prepared statements (prevents SQL injection, optimizes performance)
stmts.findSession.get(session_id);
stmts.createSession.run(session_id, model);
stmts.updateSession.run(status, total_cost, session_id);
stmts.touchSession.run(session_id); // Update updated_at

stmts.findAgent.get(agent_id);
stmts.createAgent.run(agent_id, session_id, agent_type);
stmts.updateAgent.run(status, input_tokens, output_tokens, cost, current_tool, agent_id);

stmts.createToolExecution.run(agent_id, tool_name, duration_ms, success, error_message);
stmts.createNotification.run(session_id, notification_type, message);
stmts.createPricingRule.run(pattern, input_cost_per_1m, output_cost_per_1m);
```

---

## API Reference

All endpoints return JSON unless noted. Error responses use:

```json
{
  "error": {
    "code": "SOME_CODE",
    "message": "Human-readable explanation"
  }
}
```

### OpenAPI / Swagger / ReDoc

| Method | Path                             | Description                                                                          |
| ------ | -------------------------------- | ------------------------------------------------------------------------------------ |
| `GET`  | `/api/openapi.json`              | Raw OpenAPI 3.0.3 spec                                                                |
| `GET`  | `/api/docs`                      | Interactive **Swagger UI** (try-it-out request execution)                            |
| `GET`  | `/api/redoc`                     | **ReDoc** reference — clean, read-optimized three-panel rendering of the same spec   |
| `GET`  | `/api/redoc/redoc.standalone.js` | Self-hosted ReDoc bundle (via the `redoc` dependency, never a CDN — works offline)   |

The OpenAPI spec is generated from `server/openapi.js` (`createOpenApiSpec()`), merged with supplementary fragments under `server/openapi-extra/`, and is the source of truth for request/response contracts. It now documents every backend route (75 path entries). Both Swagger UI and ReDoc (`server/lib/redoc.js`) render the same spec; the ReDoc bundle is served locally so the reference works offline / air-gapped. A committed `openapi.yaml` at the repo root mirrors the live spec — regenerate it after API changes with `npm run openapi:yaml` (never hand-edit it).

### Core Endpoints

| Method  | Path                | Description                                      |
| ------- | ------------------- | ------------------------------------------------ |
| `GET`   | `/api/health`       | Server health check (`status`, `version`, `timestamp`) |
| `GET`   | `/api/sessions`     | List sessions (`status`, `limit`, `offset`)     |
| `GET`   | `/api/sessions/:id` | Session detail (includes `agents` + `events`)   |
| `POST`  | `/api/sessions`     | Create session (idempotent by `id`)             |
| `PATCH` | `/api/sessions/:id` | Update session                                   |
| `GET`   | `/api/sessions/:id/transcripts` | List the session's transcript files (main + sub-agents) |
| `GET`   | `/api/sessions/:id/transcript`  | Cursor-paginated message stream for one transcript |
| `GET`   | `/api/agents`       | List agents (`status`, `session_id`, pagination)|
| `GET`   | `/api/agents/:id`   | Agent detail                                     |
| `POST`  | `/api/agents`       | Create agent (idempotent by `id`)               |
| `PATCH` | `/api/agents/:id`   | Update agent                                     |
| `GET`   | `/api/events`       | List events (`session_id`, `limit`, `offset`)   |
| `GET`   | `/api/stats`        | Dashboard aggregate counters                     |
| `GET`   | `/api/analytics`    | Analytics aggregates for charts/trends           |
| `GET`   | `/api/metrics`      | Prometheus / OpenMetrics exposition (text; v0.0.4) |

**Prometheus metrics (`GET /api/metrics`).** Exposes the dashboard's live counters — `ccam_sessions`/`ccam_agents` by status, `ccam_events_total`, `ccam_tokens_total` by kind, `ccam_websocket_clients`, `ccam_remote_sources` by enabled state, `ccam_process_uptime_seconds`/`ccam_process_resident_memory_bytes`, and `ccam_build_info{version}` — in the Prometheus v0.0.4 text-exposition format for scraping into Prometheus / Grafana (`server/routes/metrics.js`). Values come from the same `server/db.js` prepared statements the REST API uses, so they match the UI; status series are enumerated so a gauge never drops out of the exposition at zero. The route is read-only and, being under `/api`, sits behind both the Host-header (DNS-rebinding) guard and the optional `DASHBOARD_TOKEN` guard: a non-loopback scraper (e.g. Prometheus in Docker via `host.docker.internal`) must be allowlisted with `DASHBOARD_ALLOWED_HOSTS` or it gets `403 EBADHOST`, and must send the token when one is set.

**Data scope (`?sources=`).** `GET /api/sessions`, `/api/events`, `/api/agents`, `/api/stats`, and `/api/analytics` all accept an optional `sources` query param — a comma-separated list of source ids (`local` plus any remote source id, see [Remote Data Sources](#remote-data-sources)) — that narrows the result to sessions with a matching `sessions.source`. It is parsed by `server/lib/source-filter.js` into SQL predicates; `/api/stats` and `/api/analytics` route to the source-scoped aggregates in `server/lib/scoped-stats.js` only when a scope is present, leaving the unscoped fast paths unchanged. `GET /api/sessions/facets` additionally returns a `sources` facet enumerating the known source ids.

**Session names** are kept in sync with the transcript title: on every hook event (and in the 15 s watchdog) the ingestor reads the latest `custom-title` (`/rename`, `claude -n`, picker `Ctrl+R`) or `ai-title` (auto) from the JSONL and updates `sessions.name` — `custom-title` always wins, `ai-title` only fills a placeholder/auto name — broadcasting `session_updated` so the UI reflects renames in real time. When neither title exists, the session's first user prompt (tool-result / meta / slash-command plumbing entries skipped, 60-char label) fills the placeholder session name plus the main agent's placeholder name and empty task; a later `ai-title` can still replace a descriptor-filled name, and the agent fill passes the in-flight `current_tool` through so it is never wiped mid-turn.

**Transcript stream** (`GET /api/sessions/:id/transcript`) returns `user` / `assistant` messages plus: synthetic `session_event` rename markers (from `custom-title`), local slash-command I/O surfaced from `system`/`local_command` lines (the `<command-name>` pill + `<local-command-stdout>`/`stderr` output, e.g. `/color`, `/rename`, custom commands), and **mid-turn queued user messages** surfaced from `attachment`/`queued_command` lines — a message typed while Claude was still working is journaled as `queue-operation` bookkeeping plus a `queued_command` attachment (never as a `user` line), so the attachment is rendered as a user message at the point the model actually received it. The queue is shared with harness injections, so queued lines are only attributed to the human when they aren't harness traffic: `<task-notification>`/`[SYSTEM NOTIFICATION` payloads and any non-`human` `origin.kind` render as `system` (harness notification attachments carry no `origin` field at all; typed messages carry `origin.kind = "human"`). Content-less `local_command` lines, other `system` subtypes, `queue-operation` lines, and every other attachment subtype are dropped.

### Hook Ingestion

| Method | Path               | Description                                    |
| ------ | ------------------ | ---------------------------------------------- |
| `POST` | `/api/hooks/event` | Ingest one Claude Code hook event envelope     |

Request body shape:

```json
{
  "hook_type": "PreToolUse",
  "data": {
    "session_id": "abc-123",
    "tool_name": "Bash"
  }
}
```

### Pricing

| Method   | Path                      | Description                            |
| -------- | ------------------------- | -------------------------------------- |
| `GET`    | `/api/pricing`            | List pricing rules                     |
| `PUT`    | `/api/pricing`            | Create/update a pricing rule           |
| `DELETE` | `/api/pricing/:pattern`   | Delete pricing rule                    |
| `GET`    | `/api/pricing/cost`       | Total cost across all sessions         |
| `GET`    | `/api/pricing/cost/:id`   | Cost breakdown for one session         |

`PUT /api/pricing` also accepts optional **time-limited introductory rates** (`intro_*_per_mtok` + an `intro_until` `YYYY-MM-DD` cutoff): usage on/before the cutoff is priced at the intro rate, after it at the standard rate. Intro columns are written only when the caller sends them, so a standard-rate edit never disturbs a promo. Every rate field present must be a non-negative finite number — `NaN`/negative values are rejected with `400 INVALID_INPUT` before anything is written. The agent-list endpoints (`GET /api/agents`, `GET /api/sessions/:id/agents`) attach a per-agent `cost` — each subagent's OWN cost, computed from its `metadata.tokens` at current rates (0 for main agents, whose cost is the session total).

### Workflows

| Method | Path                          | Description                                                         |
| ------ | ----------------------------- | ------------------------------------------------------------------- |
| `GET`  | `/api/workflows`              | Aggregate workflow intelligence (`?status=active\|completed\|...`) |
| `GET`  | `/api/workflows/session/:id`  | Per-session drill-in (tree, timeline, swim lanes, events)          |

### Lanes

| Method | Path | Description |
| ------ | ---- | ----------- |
| `POST` | `/api/lanes/worktree` | Create a dashboard-managed git worktree lane; returns `202` while background provisioning finishes. |
| `GET` | `/api/lanes/:id/preflight?action=reset\|remove\|purge` | Return the exact counts and blockers a destructive confirmation must echo. |
| `POST` | `/api/lanes/:id/reset` | Confirmed managed-worktree reset; requires `force` for unpushed commits. |
| `POST` | `/api/lanes/:id/remove` | Confirmed managed-worktree teardown and branch deletion, prune of a hand-deleted worktree, or adopted-lane metadata removal; requires `force` for unpushed managed work. |
| `POST` | `/api/lanes/:id/purge` | Confirmed deletion of eligible lane sessions, events, and token usage rows. |
| `PATCH` | `/api/lanes/:id` | Same-origin guarded partial lane update. `kind`, `source_repo`, `slug`, `base_branch`, `slot` and `ports` are provisioning facts and are not patchable; an invalid `kind` returns `400 EBADKIND`. |
| `DELETE` | `/api/lanes/:id` | Same-origin guarded non-destructive lane-row removal. |
| `GET` | `/api/lanes/:id/runtime` | The lane's own application stack: slot, ports, per-service liveness, last boot error. Recomputed per call from pid files and port probes, never cached. A lane with no `.ccam/profile` returns `{available:false}` with `200`. |
| `POST` | `/api/lanes/:id/up` | Same-origin guarded stack boot through the profile's `boot` + `health` hooks; returns `202` and finishes in the background. |
| `POST` | `/api/lanes/:id/down` | Same-origin guarded stack teardown: recorded pid trees, then a port backstop only when a pid file existed. |
| `POST` | `/api/lanes/:id/hook/:name` | Same-origin guarded profile-hook run; `:name` must be in the fixed hook allowlist and `args` is passed as argv. Returns `202`. |
| `GET` | `/api/lanes/:id/logs/:svc` | Tail a hook or service log, `realpath`-confined to the lane's log directory. |

The route accepts `{ sourceRepo, title, base?, slug? }`. `sourceRepo` must be
an existing absolute git repository. The response lane starts as
`status: "provisioning"`; it becomes `idle` on success or remains a removable
managed lane with `status: "failed"` and git stderr in `notes` on failure. Use
the existing `DELETE /api/lanes/:id` route to forget a failed row that has no
worktree.

Every destructive action requires `{ confirm: true }` and a complete `expect`
object, runs under the per-lane lock, and waits for its recorded child's actual
`exit` event (beyond the five-second SIGKILL escalation) before it clears
`run_id` or runs git. A spawn failure is already exited because no child process
started and can touch the worktree; a run that never exits returns `500 ERUNTIMEOUT`
without touching it. `reset`/`remove` require `{ force: true }` if preflight
reports unpushed commits. `expect` must include `head`, `dirty`, `untracked`,
and `unpushed` for reset/remove, or `sessions`, `events`, and `tokenRows` for
purge; missing/incomplete facts return `400 EEXPECT`, and changed facts return
`409 ESTALE` with `expected` and `current` diagnostics. A missing force returns
`409 EUNPUSHED`.

`reset` cleans untracked but not ignored files and clears the lane state.
`remove` uses guarded git worktree removal and deletes the lane feature branch
before deleting a managed row; when that directory was already deleted by hand it
prunes git's stale record instead of failing; for an adopted lane it deletes only
the row and never touches the directory. `purge` returns `{ ok: true, purged: {
sessions, events, tokenRows } }`. Reset and managed remove invoke the worktree
three-check guard; `EOUTSIDEROOT` and `ENOTWORKTREE` remain `400`, while git
failures return `500` with `error.stderr`.

`start` returns `409 ERUNLIVE` when the lane's recorded run is still `spawning`
or `running`: overwriting `run_id` would orphan that child, and a later `reset`
would then `git clean -fd` a directory the orphan is still writing into.

Besides the stage a skill declares explicitly, every lane also carries a
server-inferred `detected_stage`: `server/lib/stage-detect.js` matches each
hook event's tool name/input against the pipeline template's per-node
`detect` rules, and `server/routes/hooks.js`'s `touchLaneFromHook` calls it on
every hook before any other lane bookkeeping. It is forward-only, yields to a
declared stage that is already ahead, and — the one rule that matters —
never counts as evidence and never renders a node as `done` (see
`docs/LANES.md#stage-detection`).

### Remote Data Sources

Live remote/multi-machine data collection over SSH. The dashboard pulls Claude Code history from other machines: `server/lib/remote-sync.js` uses recursive **`scp` over SSH** (built into OpenSSH — no `rsync` or extra packages on the remote) to mirror each remote's `~/.claude/projects` into a sandboxed per-source staging dir under the data dir, feeds it through the **same** importer used for local history (`scripts/import-history.js` `importFromDirectory`), and tags every imported session with the source id (`sessions.source`). Authentication defers entirely to the host SSH stack (ssh-agent / `~/.ssh/config` / identity file) — **no secrets are stored**; every command runs via `execFile`/`spawn` argument arrays (never a shell string) and `StrictHostKeyChecking` is left at its SSH default.

> **Cursor on remotes (informational):** The same note applies on synced machines — if Cursor on a remote host writes to `~/.claude`, those sessions are imported too. CCAM reads the paths, not the app name.

| Method   | Path                          | Description |
| -------- | ----------------------------- | ----------- |
| `GET`    | `/api/remote-sources`         | List configured sources (config + operational status) |
| `POST`   | `/api/remote-sources`         | Create a source |
| `PATCH`  | `/api/remote-sources/:id`     | Update a source |
| `DELETE` | `/api/remote-sources/:id`     | Delete a source; `?purge=true` also deletes that source's imported sessions |
| `POST`   | `/api/remote-sources/:id/test`| SSH connectivity probe |
| `POST`   | `/api/remote-sources/:id/sync`| Trigger an on-demand pull |
| `POST`   | `/api/remote-sources/sync-all`| Pull every enabled source now (sequential; per-source failures isolated) |

Every status transition broadcasts `remote_source.status` `{ id, status, error?, last_sync_at? }` over `/ws` (`status` one of `idle | syncing | ok | error | deleted`). A successful sync also emits `remote_data.updated` `{ sourceId, source, label?, counters?, last_sync_at? }` so open UI pages refetch sessions, costs, and analytics immediately. Enabled sources are also pulled automatically by the background sync poller (`startRemoteSourceSync` in `server/index.js`) — see [Continuous Project Sync](#continuous-project-sync) and the environment table.

#### Setup & troubleshooting

Because sync runs non-interactively (`ssh -o BatchMode=yes`), the connection must already work without a prompt. Set a source up like this:

1. **Reach the host once, manually:** `ssh user@host` (or an alias from `~/.ssh/config`). This adds the host to `~/.ssh/known_hosts` — required, since `StrictHostKeyChecking` is left at its secure default (an unknown host key fails the sync rather than being trusted blindly).
2. **Make auth passwordless:** load your key into `ssh-agent` (`ssh-add`), or set an `IdentityFile` in `~/.ssh/config`, or point the source's optional `identity_file` at the key. Passphrase prompts and password auth will not work under `BatchMode`.
3. **OpenSSH on both sides** — the dashboard machine needs the OpenSSH **client** (`ssh` + `scp`). The remote needs a running OpenSSH **server** (default on most Linux/macOS hosts; enable the OpenSSH Server optional feature on Windows). **Nothing else is installed on the remote.**
4. **Cross-platform notes:**
   - **macOS auth (Secretive, 1Password, ssh-agent, or file keys):** leave **Identity file** blank unless you need a specific key path. CCAM mirrors your shell: `ssh -G` supplies `IdentityAgent` when your `~/.ssh/config` does; otherwise it uses `SSH_AUTH_SOCK` (including `launchctl getenv` when the dashboard is GUI-launched) or plain `~/.ssh` keys. Secretive is used only when your SSH config points at it — never forced.
   - **Windows dashboard:** OpenSSH Client optional feature; CCAM prefers `ssh`/`scp` on `PATH`, then falls back to `System32\OpenSSH\`.
   - **Windows remote:** default `~/.claude` checks the Windows profile **and** WSL (`~/.claude` inside the default distro). If Claude Code runs only in WSL, leave remote home blank — CCAM auto-detects WSL and pulls via `wsl.exe` + `tar`, or set `wsl:~/.claude` / `wsl:/home/you/.claude` explicitly. Native Windows installs can use `C:/Users/you/.claude`; UNC paths such as `//wsl.localhost/Ubuntu/home/you/.claude` also work when `scp` can read them.
   - **Linux/macOS remote:** default `~/.claude/projects`; custom POSIX paths (`/home/ubuntu/.claude`) also work. Prefer SSH directly into WSL/Linux rather than Windows→WSL when possible.
5. **Add the source** (Settings → Remote Data Sources, or `ccam remote-sources add`), click **Test**, then **Sync**.

| Symptom (surfaced in `last_error` / the Test result) | Cause & fix |
| --- | --- |
| `Host key verification failed` | The host isn't in `known_hosts`. `ssh user@host` once to accept its key. |
| `Permission denied (publickey)` | No usable key for non-interactive auth. `ssh-add` your key, set `IdentityFile` in `~/.ssh/config`, or set the source's `identity_file`. |
| `… does not exist on the remote` | Claude Code's home is elsewhere on that machine. Set the source's **remote home** (default `~/.claude`). |
| `scp` / `ssh` not recognized (Windows) | Install the **OpenSSH Client** optional feature, restart the dashboard, or confirm `C:\Windows\System32\OpenSSH\scp.exe` exists. |
| `Permission denied (publickey,password)` | SSH auth failed in the **dashboard process** (not necessarily your Terminal). Leave **Identity file** blank for Secretive, ssh-agent, or default `~/.ssh` keys — CCAM follows `ssh -G` / your config and does not force Secretive. Start the dashboard from the same shell as `ssh user@host`, or ensure your agent is running. Set **Identity file** only for an explicit on-disk key. |
| Connected but directory missing | Claude Code may not be installed on the remote, or `remote_home` points at the wrong path. On Windows SSH with Claude in WSL, leave remote home blank (auto WSL) or set `wsl:~/.claude`. Default native path is `~/.claude/projects`. |
| Sync hangs then errors after ~10 min | Bounded by `DASHBOARD_REMOTE_SYNC_TIMEOUT_MS`; usually a network/host issue — verify with **Test** (bounded by `DASHBOARD_REMOTE_TEST_TIMEOUT_MS`). |

### Settings / Ops

| Method | Path                           | Description                                      |
| ------ | ------------------------------ | ------------------------------------------------ |
| `GET`  | `/api/settings/info`           | System info, DB stats, hooks status, cache stats. Also powers the Dashboard Health tab (server uptime, memory, CPU, DB record counts, WAL/journal mode, transcript cache hit/miss rates) |
| `POST` | `/api/settings/clear-data`     | Delete all sessions/agents/events/token usage    |
| `POST` | `/api/settings/reimport`       | Re-import legacy sessions from `~/.claude/`      |
| `POST` | `/api/settings/reinstall-hooks`| Reinstall Claude Code hooks                      |
| `POST` | `/api/settings/reset-pricing`  | Reset pricing table to defaults                  |
| `GET`  | `/api/settings/export`         | Export all data (sessions, agents, events, token_usage, workflows, dashboard_runs, alert_rules, model_pricing) as one versioned JSON attachment |
| `POST` | `/api/settings/import`         | Restore a bundle from `/export`. Multipart `file`, or JSON `{ path }` (server reads it). Idempotent + non-destructive: sessions already present are skipped whole |
| `POST` | `/api/settings/cleanup`        | Abandon stale sessions and purge old data        |

### Claude Config Explorer (`/api/cc-config`)

Reads — and carefully gated mutations for low-risk text-file artifacts — for every Claude Code configuration surface. Mutations always create timestamped backups under `<root>/cc-config-backups/<type>/` before writing.

| Method   | Path                                  | Description |
| -------- | ------------------------------------- | ----------- |
| `GET`    | `/api/cc-config/overview`             | Roots + counts for every surface (used by the Overview tab) |
| `GET`    | `/api/cc-config/skills`               | Skills with parsed frontmatter, `?scope=user\|project\|all` |
| `GET`    | `/api/cc-config/agents`               | Subagents under `<scope>/.claude/agents/*.md` |
| `GET`    | `/api/cc-config/commands`             | Slash commands under `<scope>/.claude/commands/*.md` |
| `GET`    | `/api/cc-config/output-styles`        | Output styles under `<scope>/.claude/output-styles/*.md` |
| `GET`    | `/api/cc-config/plugins`              | Installed plugins joined with `enabledPlugins` + per-plugin `contributes` count + `plugin.json` metadata |
| `GET`    | `/api/cc-config/marketplaces`         | `known_marketplaces.json` enriched with each marketplace's own `marketplace.json` |
| `GET`    | `/api/cc-config/mcp`                  | MCP servers from `~/.claude.json` and `settings.json` |
| `GET`    | `/api/cc-config/hooks`                | Hooks aggregated across user / project / project-local `settings.json` |
| `GET`    | `/api/cc-config/hook-scripts`         | Files in `~/.claude/hooks/` (helper scripts referenced by hook commands) |
| `GET`    | `/api/cc-config/keybindings`          | `~/.claude/keybindings.json` parsed into context-grouped key/action pairs |
| `PUT`    | `/api/cc-config/keybindings`          | Overwrite `~/.claude/keybindings.json` from `{ groups: [{ context, bindings: [{ key, action }] }] }`. Backs the file up first, preserves top-level metadata (`$schema`/`$docs`), rejects duplicate contexts/keys (`EBADCONTENT`). Safe because — unlike `settings.json` — the CLI does not rewrite it mid-session |
| `GET`    | `/api/cc-config/statusline`           | `settings.json.statusLine` config + script content if present |
| `GET`    | `/api/cc-config/settings`             | User / project / project-local settings JSON, secret keys redacted |
| `GET`    | `/api/cc-config/memory`               | `CLAUDE.md` files at user + project scope. Also returns the per-project file-based memory store as `scope:"auto-memory"` items (each carrying `project`, `name`, `isIndex`, and parsed `frontmatter`) — every `*.md` under `~/.claude/projects/<slug>/memory/` |
| `GET`    | `/api/cc-config/file?path=…`          | Body of a single file (path-contained to allowed roots) |
| `GET`    | `/api/cc-config/backups[?scope=&type=]` | Listing of all timestamped backups. Also lists `scope:"auto-memory"` backups (each carrying `project`) |
| `PUT`    | `/api/cc-config/file`                 | Create or overwrite a text-file artifact (skills/agents/commands/output-styles/memory). Body: `{ scope, type, name?, content }`. Auto-backs-up if file exists. Atomic temp + rename. 256 KB cap. Per-project file-based memory is also editable via `{ scope: "auto-memory", type: "auto-memory", project, name }` — backups land under `<memory-dir>/.cc-config-backups/auto-memory/`, and an invalid project slug returns `EBADPROJECT` |
| `DELETE` | `/api/cc-config/file`                 | Backup-then-delete a text-file artifact. Skill dirs are backed up whole before recursive removal |

### Run Claude (`/api/run`)

HTTP surface for spawning and supervising `claude` subprocesses from the dashboard. Every route enforces a same-origin / loopback-Origin guard against browser CSRF.

| Method   | Path                          | Description |
| -------- | ----------------------------- | ----------- |
| `GET`    | `/api/run`                    | List handles + `maxConcurrent` + `activeCount` |
| `GET`    | `/api/run/binary`             | Probe whether `claude` is on `PATH` |
| `GET`    | `/api/run/cwds`               | Suggested cwds (dashboard, home, recent from sessions) |
| `GET`    | `/api/run/files?cwd=…&q=…`    | Fuzzy file search inside `cwd` for the Run page's `@`-file autocomplete. Skips `node_modules`, `.git`, `dist`, `build`, `.next`, `.cache`, `coverage`, `vendor`, etc. Cwd is required and must exist; results are capped and ranked by basename match |
| `POST`   | `/api/run`                    | Spawn. Body: `{ prompt, mode, cwd?, model?, permissionMode?, resumeSessionId?, effort? }`. `effort` (`low`/`medium`/`high`) maps to `--effort`. When `resumeSessionId` is set in conversation mode, `prompt` may be empty — the spawner skips the initial stdin write and `claude --resume` idles until the client POSTs a follow-up to `/api/run/:id/message`. Spawner always passes `--output-format stream-json --verbose --include-partial-messages` for character-by-character streaming. Concurrency is effectively uncapped by default (ceiling 10000, override with `RUN_MAX_CONCURRENT`) — the terminal TUI has no cap and neither does the dashboard; the ceiling is sanity-only to prevent fork-bomb footguns |
| `POST`   | `/api/run/:id/message`        | Send follow-up turn (conversation mode only). Body: `{ text }` |
| `GET`    | `/api/run/:id`                | Handle state. `?envelopes=1` includes the in-memory envelope log for re-attach |
| `DELETE` | `/api/run/:id`                | Stop (SIGTERM → SIGKILL after 5 s) |

WebSocket message types added: `run_stream` (parsed stream-json envelope, including `stream_event` deltas from `--include-partial-messages`), `run_status` (status transitions), `run_input_ack` (stdin write confirmed), and `cc_config_changed` (broadcast by `lib/cc-watcher.js` on `fs.watch` events under `~/.claude/` and by `routes/cc-config.js` after every successful PUT/DELETE — debounced at 500 ms, payload `{ source: "dashboard"|"fs", action?, scope?, type?, name?, paths? }`).

### Import History

Bring existing Claude Code sessions into the dashboard. All four entry
points share the same JSONL parser (`parseSessionFile` +
`importSession`) used by live ingestion, so imported tokens and cost
calculations match real-time captured sessions exactly. Re-imports are
idempotent (dedupe by session ID; compaction `baseline_*` columns
prevent token double-counting).

Imported and live-scanned subagents also get their **nested hierarchy**
rebuilt: rows are inserted flat under the main agent, then
`reconcileSubagentParents` recovers each spawner from the subagent
transcript's Task tool result (`toolUseResult.agentId`) and repoints
`parent_agent_id` so subagents-of-subagents nest under their true spawner
instead of collapsing to one level. It is idempotent and additive (only
rewrites `parent_agent_id`) and runs in `importSession` and the live
`scanAndImportSubagents` path (which returns a `reparented` count).

| Method | Path                      | Description                                                              |
| ------ | ------------------------- | ------------------------------------------------------------------------ |
| `GET`  | `/api/import/guide`       | OS-aware paths, archive command, supported extensions, step instructions |
| `POST` | `/api/import/rescan`      | Rescan the default `~/.claude/projects` directory                        |
| `POST` | `/api/import/scan-path`   | Scan any absolute directory path (body: `{ path }`); walks recursively   |
| `POST` | `/api/import/upload`      | Multipart upload of `.jsonl`, `.meta.json`, `.zip`, `.tar(.gz)`, `.gz`   |

**Source files**

| File                           | Role                                                                                                   |
| ------------------------------ | ------------------------------------------------------------------------------------------------------ |
| `server/routes/import.js`      | Express router, request validation, temp-dir lifecycle, progress broadcasts                            |
| `server/lib/archive.js`        | Safe archive extractors (`.zip` / `.tar(.gz)` / `.gz`) with path-traversal and size-cap enforcement    |
| `scripts/import-history.js`    | Generalized directory walker (`importFromDirectory`) + shared `parseSessionFile` / `importSession`. Re-import is fully incremental: per-event-type high-water mark (`MAX(created_at) GROUP BY event_type` per session) drives `ts > cutoff[type]` dedup for Stop / PostToolUse / TurnDuration / ToolError, and `sessions.ended_at` is rolled forward when the JSONL has progressed past the stored value. After each batch imports, it calls `ingestWorkflowsForSession` (`server/lib/workflow-ingest.js`) per session — outside the SQLite transaction — so an offline/headless/CI/cluster **Workflow-tool** run (whose journal never reached a live server) has its inner agents linked to their `run_id` on a plain rescan / path import, not left orphaned (`workflow_run_id = NULL`) |
| `server/lib/transcript-cache.js` | Chunked 4 MiB sync byte-stream reader for JSONL transcripts — never materializes the whole file as a JS string, so files larger than V8's max string length (~512 MiB on 64-bit Node 20) parse without aborting Node with `FATAL ERROR: v8::ToLocalChecked Empty MaybeLocal` |

**Request flow (upload)**

```mermaid
sequenceDiagram
    participant UI
    participant R as /api/import/upload
    participant M as multer
    participant A as archive.js
    participant I as importFromDirectory
    participant DB as SQLite
    participant WS as ws /import.progress

    UI->>R: POST multipart files[]
    R->>M: uploadMiddleware
    M->>M: mkTempDir (per-request)<br/>fileFilter rejects unsupported
    R->>A: extractInto(file, workDir)
    A->>A: safeJoin (path-traversal guard)
    A->>A: enforce MAX_EXTRACT_BYTES
    alt bomb / traversal / oversize
      A-->>R: ExtractionLimitError
      R-->>UI: 413 EXTRACTION_LIMIT_EXCEEDED
      R->>WS: import.progress{phase:error}
    else ok
      A-->>R: {extracted, skipped}
    end
    R->>I: importFromDirectory(workDir)
    I->>I: collectJsonlFiles (recursive)
    I->>DB: importSession in one tx
    I->>WS: import.progress{phase:parse, complete}
    R-->>UI: 200 {imported, backfilled, skipped,<br/>errors, rejected_files}
    R->>A: rmTempDir(workDir + req._ccamUploadDir)
```

**Supported source layouts.** Both canonical Claude Code JSONL layouts
are recognised automatically — `<proj>/<sid>/subagents/agent-*.jsonl`
(default) and `<proj>/subagents/<sid>/agent-*.jsonl` (alternative) —
and orphan subagent files (parent JSONL missing from the upload) are
attached to an existing DB session whenever the inferred session ID
matches one probed from either layout candidate.

**Environment variables**

| Variable                          | Default     | Purpose                                                           |
| --------------------------------- | ----------- | ----------------------------------------------------------------- |
| `CCAM_IMPORT_MAX_BYTES`           | `1073741824` | Maximum size per uploaded file                                   |
| `CCAM_IMPORT_MAX_FILES`           | `2000`      | Maximum files per upload request                                 |
| `CCAM_IMPORT_MAX_EXTRACT_BYTES`   | `4294967296` | Total uncompressed bytes allowed per archive (zip-bomb guard)   |

**WebSocket event schema.** Progress is broadcast on `/ws` with type
`import.progress`. Messages are throttled at ~150 ms; the terminal
`complete` and `error` frames are always delivered.

```json
{
  "type": "import.progress",
  "timestamp": "2026-04-18T15:48:34.123Z",
  "data": {
    "importId": "upload-1729264114000",
    "phase": "parse",
    "source": "upload",
    "processed": 184,
    "total": 512,
    "current": "/tmp/ccam-import-work-xyz/project/<uuid>.jsonl",
    "counters": { "imported": 120, "backfilled": 40, "skipped": 20, "errors": 4 }
  }
}
```

Phases: `start` → `scan` → `extract` (upload only) → `parse` →
`complete`, with `error` / `extract_error` replacing `complete` on
failure.

**Response envelopes**

```jsonc
// 200 — import completed
{
  "ok": true,
  "source": "upload",            // "default" | "path" | "upload"
  "path": "/abs/path",           // only for source=path
  "imported": 120,
  "backfilled": 40,
  "skipped": 20,
  "errors": 4,
  "sessions_seen": 180,
  "files_scanned": 512,
  "files_received": 8,           // upload only
  "rejected_files": [],          // upload only; unsupported extensions
  "entries_extracted": 180,      // upload only
  "entries_skipped": 0           // upload only
}

// 400 — validation failure
{ "error": { "code": "PATH_NOT_FOUND", "message": "..." } }

// 413 — extraction cap exceeded (zip-bomb defense)
{
  "error": { "code": "EXTRACTION_LIMIT_EXCEEDED", "message": "..." },
  "offending_file": "suspicious.tar.gz"
}
```

---

## WebSocket Protocol

### Connection Lifecycle

```mermaid
sequenceDiagram
    participant Client
    participant Server
    participant DB
    
    Client->>Server: WebSocket handshake
    Server-->>Client: Connection established
    
    loop Every 30s
        Server->>Client: ping
        Client->>Server: pong
    end
    
    Note over Server,DB: Hook event arrives
    Server->>DB: Update data
    Server->>Client: broadcast({ type, data })
    
    Client->>Server: Close connection
    Server-->>Client: Connection closed
```

### Message Types

Server broadcasts JSON messages to all connected clients:

```typescript
// Session created
{
  "type": "session.created",
  "data": { ...session object }
}

// Session updated (status change, cost update)
{
  "type": "session.updated",
  "data": { ...session object }
}

// Agent created
{
  "type": "agent.created",
  "data": { ...agent object }
}

// Agent updated (status, tokens, cost)
{
  "type": "agent.updated",
  "data": { ...agent object }
}

// Tool executed
{
  "type": "tool.executed",
  "data": { ...tool execution object }
}

// Notification received
{
  "type": "notification.received",
  "data": { ...notification object }
}

// Remote data source status transition
{
  "type": "remote_source.status",
  "data": { "id": "...", "status": "idle|syncing|ok|error|deleted", "error": "...?", "last_sync_at": "...?" }
}

// Remote data imported — nudge stats pages to refetch
{
  "type": "remote_data.updated",
  "data": { "sourceId": "...", "source": "...", "label": "...?", "counters": { "imported": 0, "skipped": 0 }, "last_sync_at": "...?" }
}
```

### Broadcasting Logic

```javascript
// websocket.js
function broadcast(message) {
  const payload = JSON.stringify(message);
  wss.clients.forEach(client => {
    if (client.readyState === WebSocket.OPEN) {
      client.send(payload);
    }
  });
}

// Usage in routes/hooks.js
broadcast({ type: 'session.created', data: session });
```

---

## Hook Processing

### Hook Event Flow

```mermaid
sequenceDiagram
    participant Claude as Claude Code
    participant Hook as hook-handler.js
    participant Server as Server :4820
    participant DB as SQLite
    participant WS as WebSocket
    participant Client as Browser
    
    Claude->>Hook: stdin JSON payload
    Hook->>Server: POST /api/hooks/event
    Server->>DB: INSERT/UPDATE session, agent, event, token_usage
    Server->>WS: broadcast(session_created/agent_updated/new_event)
    WS->>Client: { type: "...", data: {...}, timestamp: "..." }
    Server-->>Hook: 200 OK
    Hook-->>Claude: exit 0 (non-blocking)
```

### Hook Endpoints

All hook traffic is sent to one endpoint:

| Method | Endpoint | Notes |
|--------|----------|-------|
| `POST` | `/api/hooks/event` | Body includes `hook_type` and `data`; server routes behavior by hook type |

Supported `hook_type` values include `PreToolUse`, `PostToolUse`, `Stop`, `SubagentStop`, `Notification`, `SessionStart`, and `SessionEnd`.

### Hook Processing Logic

```javascript
// routes/hooks.js
router.post("/event", (req, res) => {
  const { hook_type, data } = req.body;
  if (!hook_type || !data) {
    return res.status(400).json({
      error: { code: "INVALID_INPUT", message: "hook_type and data are required" },
    });
  }

  const event = processEvent(hook_type, data); // updates sessions, agents, events, tokens
  if (!event) {
    return res.status(400).json({
      error: { code: "MISSING_SESSION", message: "session_id is required in data" },
    });
  }

  res.json({ ok: true, event });
});
```

### Pricing Calculation

```mermaid
graph TB
    Hook[Hook Event] --> Tokens{Has Token<br/>Counts?}
    Tokens -->|Yes| Match[Match Model Pattern]
    Tokens -->|No| Skip[Skip Cost Calc]
    
    Match --> Custom{Custom Rule<br/>Exists?}
    Custom -->|Yes| UseCustom[Use Custom Pricing]
    Custom -->|No| UseDefault[Use Default Pricing]
    
    UseCustom --> Calc[Calculate Cost]
    UseDefault --> Calc
    
    Calc --> Update[Update Agent Cost]
    Update --> Rollup[Rollup to Session Cost]
    Rollup --> Broadcast[Broadcast Update]
    
    style Calc fill:#10B981
    style Broadcast fill:#F59E0B
```

**Cost Formula:**

```javascript
function calculateCost(model, inputTokens, outputTokens) {
  // Find matching pricing rule (custom or default)
  const rule = findPricingRule(model);
  
  // Cost = (input tokens / 1M * input price) + (output tokens / 1M * output price)
  const inputCost = (inputTokens / 1_000_000) * rule.input_cost_per_1m;
  const outputCost = (outputTokens / 1_000_000) * rule.output_cost_per_1m;
  
  return inputCost + outputCost;
}
```

### Default Pricing Rules

Loaded on first run from `db.js`:

```javascript
// [pattern, display_name, input, output, cache_read, cache_write_5m, cache_write_1h]
// (rates per million tokens; 5m write ≈ 1.25× input, 1h write ≈ 2× input)
const DEFAULT_PRICING = [
  ["claude-fable-5%", "Claude Fable 5", 10, 50, 1, 12.5, 20],
  ["claude-mythos-5%", "Claude Mythos 5", 10, 50, 1, 12.5, 20],
  ["claude-opus-4-8%", "Claude Opus 4.8", 5, 25, 0.5, 6.25, 10],
  ["claude-sonnet-4-6%", "Claude Sonnet 4.6", 3, 15, 0.3, 3.75, 6],
  ["claude-haiku-4-5%", "Claude Haiku 4.5", 1, 5, 0.1, 1.25, 2],
  // ... one explicit row per model (see server/db.js for the full list)
];
```

---

## Data Flow

### Session Lifecycle

```mermaid
stateDiagram-v2
    [*] --> waiting: SessionStart startup/resume/clear (status=active + flag)
    active --> active: SessionStart compact (mid-turn — state preserved, no flag)
    waiting --> active: UserPromptSubmit / PreToolUse / PostToolUse
    active --> waiting: Stop (non-error, flag re-stamped)
    active --> waiting: Permission Notification (agent → waiting)
    active --> waiting: Esc cancel (watchdog marker or idle timeout)
    active --> error: Stop (stop_reason=error)
    active --> error: API error detected (watchdog)
    waiting --> error: API error detected (watchdog)
    error --> active: UserPromptSubmit / PreToolUse (recovery)
    error --> active: Watchdog self-heal (transcript progressed past the error)
    waiting --> completed: SessionEnd (CLI exited)
    active --> completed: SessionEnd (CLI exited)
    error --> error: SessionEnd (error still unrecovered at transcript tail)
    error --> completed: SessionEnd (error recovered — successful turns after it)
    waiting --> abandoned: Stale > DASHBOARD_STALE_MINUTES
    active --> abandoned: Stale > DASHBOARD_STALE_MINUTES
    completed --> active: Session resumed (new work event)
    error --> active: Session resumed (new work event)
    abandoned --> active: Session resumed (new work event)
    completed --> [*]
    error --> [*]
    abandoned --> [*]
```

### Agent Lifecycle

```mermaid
stateDiagram-v2
    [*] --> waiting: ensureSession (first hook)
    waiting --> working: PreToolUse / UserPromptSubmit
    working --> working: PostToolUse (tool completed)
    working --> waiting: Stop (non-error)
    working --> waiting: Notification (input prompt)
    working --> waiting: Esc cancel (watchdog marker or idle timeout)
    waiting --> error: Stop with error
    working --> error: Stop with error
    waiting --> error: API error detected (watchdog)
    working --> error: API error detected (watchdog)
    error --> working: UserPromptSubmit / PreToolUse (recovery)
    working --> completed: SessionEnd
    waiting --> completed: SessionEnd

    note right of waiting
        Agent is between turns or
        awaiting user input
    end note
```

### Hook to Database Flow

```mermaid
graph TB
    subgraph "Hook Event"
        JSON[JSON Payload]
    end
    
    subgraph "Request Validation"
        Parse[Parse JSON]
        Validate[Validate Fields]
    end
    
    subgraph "Database Updates"
        Session[Upsert Session]
        Agent[Upsert Agent]
        Tool[Insert Tool Execution]
        Notif[Insert Notification]
        Cost[Update Costs]
    end
    
    subgraph "Broadcasting"
        Build[Build WS Message]
        Send[Send to Clients]
    end
    
    JSON --> Parse
    Parse --> Validate
    Validate --> Session
    Validate --> Agent
    Validate --> Tool
    Validate --> Notif
    Validate --> Cost
    
    Session --> Build
    Agent --> Build
    Tool --> Build
    Notif --> Build
    Cost --> Build
    
    Build --> Send
    
    style Parse fill:#3B82F6
    style Session fill:#10B981
    style Build fill:#F59E0B
```

---

## Error Handling

### HTTP Error Codes

```mermaid
graph TB
    Request[Incoming Request] --> Validation{Valid?}
    
    Validation -->|No| R400[400 Bad Request]
    Validation -->|Yes| Process[Process Request]
    
    Process --> DBOperation{DB Success?}
    DBOperation -->|No| R500[500 Internal Server Error]
    DBOperation -->|Yes| Response{Found?}
    
    Response -->|No| R404[404 Not Found]
    Response -->|Yes| R200[200 OK]
    
    style R400 fill:#EF4444
    style R404 fill:#F59E0B
    style R500 fill:#DC2626
    style R200 fill:#10B981
```

### Error Response Format

```json
{
  "error": "Session not found",
  "code": "NOT_FOUND",
  "details": {
    "session_id": "sess_invalid"
  }
}
```

### Graceful Degradation

```javascript
// Hook endpoint never throws unhandled errors to Claude Code
router.post("/api/hooks/event", (req, res) => {
  try {
    // Process hook
    processHookEvent(req.body);
    res.json({ ok: true });
  } catch (err) {
    console.error("Hook processing error:", err);
    // Still return 200 to avoid blocking Claude Code
    res.json({ ok: false, error: err.message });
  }
});
```

### Error Detection Watchdog

The server runs a background error detection timer every 15 seconds that proactively catches API errors even when Claude Code fails to fire hooks:

1. **Stale session scan** — finds active sessions with no recent hook events (>10 seconds since last event)
2. **Transcript re-read** — re-reads JSONL transcript files for those sessions looking for API errors (401 auth failures, rate limits, quota exhaustion)
3. **Path derivation** — for imported sessions that don't have `transcript_path` in event data, derives the transcript path from the session's `cwd`
4. **Error marking** — marks sessions and agents as `error` when API errors are found in transcripts

This catches cases where the Claude CLI doesn't fire a hook after an API error (e.g., 401 auth failures where the CLI just shows the error message and waits for user input).

### Continuous Project Sync

The startup auto-import of `~/.claude/projects` is **one-time** (marker-gated via `.legacy-import.done`), so a project folder created *after* first launch — whose sessions never flow through hooks (e.g. host-only hooks disabled) — would stay invisible until a manual rescan. `startSessionSync` (in `server/index.js`, wired into `startBackgroundServices`) closes that gap. It calls the exported `syncDefaultProjects(dbModule, { mtimeCache })` from `scripts/import-history.js` via three triggers that share **one** `mtimeCache` and a **single coalesced sweep** (a `running`/`queued` guard serializes overlapping triggers so at most one sweep runs at a time, with at most one more queued):

1. **Immediate sweep** at startup — surfaces anything the one-time backfill missed, right away instead of after the first interval.
2. **Debounced `fs.watch` (800 ms)** — fires a sweep the instant a *new* session file or project folder appears. Events for paths already in `mtimeCache` (active transcripts being appended) are ignored, so a busy session never thrashes the importer — its growth is left to the poll. Recursive watch is used on macOS/Windows (native, stable); on Linux the root + each immediate child folder are watched **non-recursively** (avoids the userland recursive-watcher hazard documented in `lib/cc-watcher.js`), adding a child watcher whenever a new folder appears.
3. **Periodic poll** — a safety-net sweep on `DASHBOARD_SESSION_SYNC_MS` (default `30000` ms; `0` disables the poll but leaves the watcher running), covering events a watcher can miss (e.g. on network filesystems).

Each sweep parses **only** files whose mtime is new or has advanced. A cold-cache fast path (e.g. the immediate sweep on every restart, when `mtimeCache` is empty) additionally skips an already-imported session whose file mtime hasn't advanced past its DB row's `updated_at`, so restart cost stays O(new/changed files) instead of re-parsing every transcript on disk. For each touched session it then broadcasts `session_created` / `session_updated` plus the session's main agent (`agent_created` / `agent_updated`) — the same frames hooks emit, so the UI refreshes live. All timers and watchers are `unref`'d and best-effort; nothing here can block shutdown or take down the server.

### Remote Data Source Sync

`startRemoteSourceSync` (in `server/index.js`, wired into `startBackgroundServices`) pulls history from every **enabled** [Remote Data Source](#remote-data-sources) on an interval. A cheap guard first checks whether any enabled source exists, so the poller does no SSH work at all until the user configures one. Each tick delegates to `server/lib/remote-sync.js`, which pulls the remote's `~/.claude/projects` via `scp` into a sandboxed per-source staging dir and runs it through `importFromDirectory`, tagging imported sessions with the source id. The interval is `DASHBOARD_REMOTE_SYNC_MS` (default `15000` ms; `0` disables the poller); adding or re-enabling a source also triggers an immediate pull. A per-source pull is bounded by `DASHBOARD_REMOTE_SYNC_TIMEOUT_MS` (default `600000` ms) and the connectivity test by `DASHBOARD_REMOTE_TEST_TIMEOUT_MS` (default `15000` ms). Status transitions broadcast `remote_source.status`; successful syncs also broadcast `remote_data.updated` so the client refetches sessions, costs, and analytics as soon as the mirror lands. The timer is `unref`'d and fail-safe — a hung or unreachable remote never wedges the dashboard.

After each pull imports and tags a source's sessions, `remote-sync.js` **reconciles their live status from the fresh mirror** (`reconcileRemoteSessionStatus`). Remote sessions receive no live hooks and are excluded from every local liveness/stale heuristic (see below), so the mirror is their single source of truth: activity is judged from the **newest event timestamp inside each transcript** (falling back to mirror mtime when the file has no parseable events). A session whose last event is within `DASHBOARD_REMOTE_ACTIVE_WINDOW_MS` (default `600000` ms = 10 min) is treated as still running (→ `active`, main agent back to `waiting`); once it stops advancing, the session lands in `completed` with its agents completed and `ended_at` stamped — the same terminal state a real `SessionEnd` produces. This is what keeps an already-imported remote session's status correct on every subsequent sync (the shared importer only sets status on first insert), and it self-heals any remote session a pre-fix build wrongly completed.

### User-Interrupt (Esc) Recovery

Cancelling a turn with `Esc` fires **no Claude Code hook** (a documented CLI limitation), so the `UserPromptSubmit` that promoted the main agent to `working` is never undone — the session would otherwise sit in `working` forever. The same 15 s watchdog recovers it, with two detection paths:

1. **Transcript marker** — when the cancel happens *after* some output, Claude Code writes a `[Request interrupted by user]` entry (carrying an `interruptedMessageId`) to the transcript. `TranscriptCache` exposes `pendingInterrupt`, computed purely from transcript ordering — the latest interrupt timestamp vs the latest real turn activity (assistant output or a genuine user prompt), both on Claude Code's clock. This is deliberately **not** compared against the session's last hook event: those are different clocks, and for a sub-second cancel the `UserPromptSubmit` event is stamped *after* the transcript interrupt, which is exactly what left such sessions stuck. Recovers within ~15 s.
2. **Idle-working timeout** — when Esc is pressed *before any output*, Claude Code writes **no marker at all**; the only signal is silence. When the main agent has been `working` with `current_tool` null and **neither a hook event nor the transcript mtime** has advanced for `DASHBOARD_WORKING_IDLE_SECONDS` (default `120`), the turn is treated as dead. Streaming output (transcript still growing) and in-flight tool calls are exempt by these guards; a rare false flip self-heals on the next real hook.

Both paths move the session to **Waiting** (main agent → `waiting`, `awaiting_input_since` stamped, and its paired nullable `awaiting_reason` TEXT column — one of `notification` | `stop` | `session_start` | `interrupted`, set and cleared in lock-step with `awaiting_input_since` — set to `interrupted`) — the same state a normal `Stop` produces (which records `awaiting_reason` = `stop`) — and log an `Interrupted` event. If the user resumes (a new prompt lands in the transcript), `pendingInterrupt` flips back to false and the fresh hook keeps the session non-stale.

### Dead-Session Liveness Reap

`SessionEnd` is the **only** signal that a session closed, and hooks are fire-and-forget — if the dashboard was down when the user quit (Ctrl+C, terminal closed), the event is lost forever and the session previously sat in **Waiting** until the stale sweep (3 h by default). The same 15 s watchdog now supplies the missing ground truth with a **process-liveness probe** (`server/lib/session-liveness.js`): it lists running `claude` CLI processes (`ps -Ao pid=,args=` + `lsof -d cwd` on macOS, `/proc/<pid>/cwd` on Linux) and completes any `active` session whose `cwd` has no live claude process — the same terminal state a real `SessionEnd` produces (agents → `completed`, `ended_at` stamped, `awaiting_input_since` and its paired `awaiting_reason` cleared to NULL together, a synthetic `SessionEnd` event with `data.source = "liveness-probe"`, broadcasts for live UI updates).

Fail-safe guards, in order:

- The probe must be **trustworthy**: it reports "no answer" (and the reap changes nothing) on Windows, inside containers (host processes are invisible), when `ps`/`lsof` fail, or when explicitly disabled via `DASHBOARD_LIVENESS_PROBE=0` — the escape hatch for setups where hooks arrive from another machine, where local processes prove nothing.
- The session must have a `cwd` to match on.
- The `cwd` must be **POSIX-absolute** (`path.isAbsolute`). A session forwarded from another machine via household hooks reports the origin's own path syntax (e.g. a Windows `D:\Git\ai-deck`), which this host's `/proc`/`lsof` scan can never produce — so its absence from the probe is not a death signal. Such sessions are skipped (never reaped by this probe), while genuinely-local POSIX sessions are still reaped on real crashes. This keeps a **mixed** deployment (local *and* household-forwarded sessions on one instance) correct without sacrificing local crash detection via `DASHBOARD_LIVENESS_PROBE=0`.
- **Remote Data Source sessions** (`sessions.source` ≠ `local`) are excluded outright — the reap query, the watchdog's transcript error/interrupt scan, the startup 1 h cleanup, and the periodic abandon sweep are all gated on `source = 'local' OR source IS NULL`. A remote session's `cwd` is legitimately POSIX-absolute on *another* machine (e.g. `/home/ubuntu/matroid`), so the POSIX-cwd guard above can't catch it, and this host's process probe / clock say nothing about a box reached over SSH. Their active/completed lifecycle is owned solely by `remote-sync.js`'s mirror reconciliation (see the Remote source sync section above). Without this guard a busy remote session was wrongly completed the moment no local `claude` matched its cwd.
- On **watchdog ticks only** (both startup passes skip this gate — at boot the probe alone decides, so a session quit moments before launch clears immediately): the session's **transcript mtime** must be older than `DASHBOARD_LIVENESS_IDLE_SECONDS` (default `60`) — the transcript is the ground-truth activity clock (Claude Code appends to it every turn and it stops moving the instant the process dies); `updated_at` is only the fallback for sessions with no transcript on disk. Keying on `updated_at` would leave a freshly imported dead session in Waiting for a full extra gate period after every boot, since import/backfill passes bump it at startup. A mid-turn session with a mismatched cwd (e.g. `claude --resume` run from a different directory) keeps its transcript mtime fresh and is spared.
- A false completion self-heals: the next hook event reactivates the session via the existing reactivation path.
- Only `status = 'active'` rows are considered; `error` sessions keep their existing recovery paths.

Cadence: **immediately at startup** (dead sessions already in the DB from a previous run clear before they ever render), **again ~5 s after startup** (covering rows the startup project sync just imported), and on every 15 s watchdog tick as the safety net for anything later (`kill -9` / crashes fire no `SessionEnd` either). Both boot passes live in `startBackgroundServices` and are fail-safe.

### API Error → Error State Flow

API errors detected in JSONL transcripts (`isApiErrorMessage` entries: quota limits, rate limits, `invalid_request`) now **immediately mark the session and agent as `error`**. Previously, these errors were recorded as `APIError` events but did not change session/agent status.

Error state transitions:
- `Stop` with `stop_reason=error` → agent `error`, session `error`
- API error in transcript (hook-based or watchdog) → session `error`, agent `error`
- `Notification` indicating input prompt → agent `waiting` (status change, not just flag)
- `SessionEnd` on error session → **preserves** `error` **only if the error is unrecovered at the transcript tail** (`isErrorAtTail`: the latest API error has no successful turn after it). A transient error the CLI retried past (successful turns after it) finalizes as `completed`, so a long healthy run doesn't exit frozen in a stale `error` from days earlier.

### Error Recovery

Three ways a session leaves `error`:
- **`UserPromptSubmit`** — user hits enter on a new prompt (active retry)
- **`PreToolUse`** — agent begins using a tool (session resumed with work)
- **Watchdog self-heal** — the 15 s watchdog now scans `error` sessions too. When the transcript shows the session progressed past the last API error (successful turns after it — `isErrorAtTail` is false), it clears the error back to `active`. This closes the gap where a transient API error (e.g. "Connection closed mid-response" — the CLI auto-retries and keeps going) left a session that recovered but never received a live `UserPromptSubmit`/`PreToolUse` hook — or one driven purely by the transcript sweep — pinned in `error` forever.

Live user actions and the transcript-tail check clear the error; unrelated background activity does not (the watchdog only clears when the transcript proves recovery).

### Graceful Shutdown

`SIGTERM` / `SIGINT` tear the server down in a fixed order so a restart is fast and clean (this matters most under `node --watch`, which SIGTERMs on every file save):

1. **Drop realtime clients first** — `closeWebSocket()` (`server/websocket.js`) terminates every WebSocket client so their underlying TCP sockets release. Open WS sockets otherwise keep the HTTP server alive.
2. **`httpServer.close()`** — stop accepting new connections and begin draining in-flight requests.
3. **`httpServer.closeAllConnections()`** — forcibly drop lingering keep-alive sockets so `close()` actually completes promptly instead of hanging.
4. **Close SQLite last** — inside the `close()` callback, *after* the HTTP server has drained, then `process.exit(0)`.

Ordering matters: closing the DB before the HTTP server drained made in-flight requests throw `The database connection is not open` (e.g. `routes/agents.js`); leaving WS/keep-alive sockets open stalled shutdown until the 5 s force-exit backstop (the "waiting for graceful termination" hang). A second signal forces an immediate exit.

---

## Performance

### Query Optimization

```mermaid
graph TB
    subgraph "Optimization Strategies"
        Prepared[Prepared Statements<br/>Prevent SQL injection<br/>Cache query plans]
        Indexes[Database Indexes<br/>session_id, agent_id, timestamps]
        Limits[Query Limits<br/>Default: 50 sessions]
        Transactions[Transactions<br/>Batch hook updates]
    end
    
    subgraph "Results"
        Fast[Fast Queries<br/>&lt; 5ms average]
        Scalable[Scalable<br/>1000s of sessions]
        Efficient[Efficient<br/>Low CPU usage]
    end
    
    Prepared --> Fast
    Indexes --> Fast
    Limits --> Scalable
    Transactions --> Efficient
    
    style Fast fill:#10B981
    style Scalable fill:#10B981
    style Efficient fill:#10B981
```

### Benchmarks

| Operation | Average Time | Notes |
|-----------|--------------|-------|
| Hook ingestion | 2-5 ms | Includes DB write + broadcast |
| Session list query | 3-8 ms | 50 sessions with agent counts |
| Session detail query | 1-2 ms | Single session lookup |
| Agent tools query | 5-15 ms | 100 tool executions |
| WebSocket broadcast | < 1 ms | Per client |

### Memory Usage

```mermaid
graph LR
    subgraph "Memory Footprint"
        Base[Base: ~50MB<br/>Node.js + Express]
        DB[DB: ~10MB<br/>SQLite connection]
        WS[WS: ~1MB/client<br/>WebSocket buffers]
        Total[Total: ~60-100MB<br/>10 concurrent clients]
    end
    
    Base --> Total
    DB --> Total
    WS --> Total
    
    style Total fill:#3B82F6
```

### Scaling Considerations

```mermaid
graph TB
    subgraph "Current Architecture"
        Single[Single Process<br/>SQLite + WebSocket]
    end
    
    subgraph "Scaling Options"
        Multi[Multi-Process<br/>Cluster mode]
        Redis[Redis Pub/Sub<br/>Shared WS state]
        Postgres[PostgreSQL<br/>Concurrent writes]
    end
    
    Single -.->|If load increases| Multi
    Multi --> Redis
    Multi --> Postgres
    
    style Single fill:#3B82F6
    style Multi fill:#F59E0B
```

**Current limits:**
- SQLite: 1000s of sessions, 10,000s of tool executions
- WebSocket: 100+ concurrent clients
- CPU: Low (<5% idle, <20% during hook bursts)

For >1000 concurrent clients or >100k sessions, consider:
- Cluster mode with Redis pub/sub for WebSocket broadcasting
- PostgreSQL for better concurrent write performance
- Read replicas for API queries

---

## Testing

### Test Structure

```mermaid
graph TB
    subgraph "Test Suite"
        Integration[Integration Tests<br/>__tests__/api.test.js]
    end
    
    subgraph "Test Coverage"
        Sessions[Session API<br/>CRUD operations]
        Agents[Agent API<br/>CRUD operations]
        Hooks[Hook Endpoints<br/>Event processing]
        Pricing[Pricing API<br/>Rule management]
    end
    
    Integration --> Sessions
    Integration --> Agents
    Integration --> Hooks
    Integration --> Pricing
    
    style Integration fill:#8B5CF6
```

### Running Tests

```bash
# Run all server tests
npm run test:server

# Run with verbose output
node --test --test-reporter=spec server/__tests__/*.test.js
```

### Example Test

```javascript
// __tests__/api.test.js
import { test } from 'node:test';
import assert from 'node:assert';

test("POST /api/hooks/event ingests hook payload", async () => {
  const response = await fetch("http://localhost:4820/api/hooks/event", {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      hook_type: "SessionStart",
      data: {
        session_id: "test_session",
        model: "claude-sonnet-4",
        session_name: "Example Session",
      },
    })
  });
  
  const data = await response.json();
  assert.strictEqual(data.ok, true);
  
  // Verify session created
  const session = await fetch('http://localhost:4820/api/sessions/test_session');
  const sessionData = await session.json();
  assert.strictEqual(sessionData.session.model, 'claude-sonnet-4');
});
```

---

## Terminal Access (`ccam` CLI)

Everything this server exposes over REST is also reachable from a terminal via the repo's dependency-free `ccam` CLI (`bin/ccam.js`, linked by `npm run setup`): monitoring (`health`/`stats`/`kanban`/`tail`), data browsing, analytics/workflows/cost, lane adoption and managed-worktree provisioning (`lanes add --cwd` / `lanes add --repo`), fact-confirmed lane reset/removal/purge (`lanes reset|remove|purge <id> --yes`), alerts + webhook tests, pricing CRUD, imports, and administration (`doctor`/`export`/`cleanup`/`reinstall-hooks`/`update-check`/`clear-data --yes`). It resolves the live server through the same `~/.claude/.agent-dashboard.json` registry the hook handler uses. See [docs/CLI.md](../docs/CLI.md).

## Deployment

### Production Checklist

```mermaid
graph TB
    subgraph "Pre-Deployment"
        Build[Build Client<br/>npm run build]
        Test[Run Tests<br/>npm test]
        Env[Set Environment<br/>NODE_ENV=production]
    end
    
    subgraph "Deployment"
        Start[Start Server<br/>npm start]
        Monitor[Monitor Logs<br/>Health checks]
    end
    
    subgraph "Post-Deployment"
        Verify[Verify API<br/>curl localhost:4820/api/sessions]
        WebSocket[Test WebSocket<br/>Browser connection]
    end
    
    Build --> Test
    Test --> Env
    Env --> Start
    Start --> Monitor
    Monitor --> Verify
    Verify --> WebSocket
    
    style Build fill:#3B82F6
    style Start fill:#10B981
    style Verify fill:#F59E0B
```

### Environment Variables

```bash
# Server configuration
DASHBOARD_PORT=4820                # Server port
NODE_ENV=production                # Environment mode
DASHBOARD_CLIENT_DIST=             # Where the built UI is served from (default: ../client/dist)

# Network exposure & hardening (see server/lib/security.js)
DASHBOARD_HOST=127.0.0.1           # Bind address; default loopback. Set 0.0.0.0 to widen (logs a warning)
DASHBOARD_TOKEN=                   # Optional bearer token; when set, /api/* and the WebSocket require it (off by default)
DASHBOARD_ALLOWED_HOSTS=           # Extra Host-header names to allow (comma-separated), e.g. for LAN access

# Database
DASHBOARD_DB_PATH=./data/dashboard.db  # SQLite database path

# Background services
DASHBOARD_SESSION_SYNC_MS=30000    # Continuous project-sync poll interval (ms); 0 disables the poll (watcher stays)
DASHBOARD_LIVENESS_PROBE=1         # 0 disables the dead-session liveness reap (use when hooks arrive from another machine)
DASHBOARD_LIVENESS_IDLE_SECONDS=60 # Idle gate before the liveness reap may complete a process-less session

# Remote Data Sources (SSH pull; see the Remote Data Sources section)
DASHBOARD_REMOTE_SYNC_MS=15000         # Remote-source sync poll interval (ms); 0 disables the poller
DASHBOARD_REMOTE_SYNC_TIMEOUT_MS=600000# Per-source scp/pull timeout (ms)
DASHBOARD_REMOTE_TEST_TIMEOUT_MS=15000 # SSH connectivity-test timeout (ms)
DASHBOARD_REMOTE_ACTIVE_WINDOW_MS=600000 # Freshness window (ms) for a remote session's live status (active↔completed)

# Logging
LOG_LEVEL=info                     # Log level (debug, info, warn, error)
```

### Running in Production

```bash
# Start server (production mode)
NODE_ENV=production node server/index.js

# With PM2 (process manager)
pm2 start server/index.js --name agent-dashboard

# With systemd
sudo systemctl start agent-dashboard
```

### Docker Deployment

```dockerfile
# Dockerfile (root of project)
FROM node:22-alpine

WORKDIR /app

# Install dependencies
COPY package*.json ./
COPY client/package*.json ./client/
RUN npm ci --production && cd client && npm ci --production

# Build client
COPY client ./client
RUN cd client && npm run build

# Copy server
COPY server ./server
COPY data ./data

EXPOSE 4820

CMD ["node", "server/index.js"]
```

```bash
# Build and run
docker build -t agent-dashboard .
docker run -p 127.0.0.1:4820:4820 -v "$HOME/.claude/agent-dashboard:/app/data" agent-dashboard
```

---

## Configuration

### Server Configuration (index.js)

```javascript
const PORT = parseInt(process.env.DASHBOARD_PORT || '4820', 10);
const HOST = process.env.DASHBOARD_HOST || '127.0.0.1';
const DB_PATH = process.env.DASHBOARD_DB_PATH || './data/dashboard.db';

const { corsOptions, hostGuard, tokenGuard } = require('./lib/security');

const app = express();
app.use(cors(corsOptions()));    // loopback-only origins
app.use(hostGuard);              // Host-header allowlist (anti DNS-rebinding)
app.use('/api', tokenGuard);     // optional DASHBOARD_TOKEN bearer auth
app.use(express.json({ limit: '10mb' }));

server.listen(PORT, HOST);       // binds 127.0.0.1 by default
```

The server **binds `127.0.0.1` (loopback) by default**, so it is not
network-reachable out of the box (CVE / advisory `GHSA-gr74-4xfh-6jw9`).
The hardening helpers all live in [`server/lib/security.js`](lib/security.js):

- **`corsOptions()`** restricts CORS to loopback origins — cross-origin pages
  in a browser cannot read responses (no-Origin clients such as `curl` still work).
- **`hostGuard`** enforces a Host-header allowlist on HTTP requests and WebSocket
  upgrades, blocking DNS-rebinding attacks.
- **`tokenGuard`** is a no-op unless `DASHBOARD_TOKEN` is set; when it is, every
  `/api/*` request (and the WebSocket) must present the token via
  `Authorization: Bearer <token>`, an `x-dashboard-token` header, or `?token=`.

Set **`DASHBOARD_HOST`** (e.g. `0.0.0.0`) to widen the bind beyond loopback —
this logs a startup warning and you should set **`DASHBOARD_TOKEN`** for auth
when you do. Add extra LAN Host names that should be accepted to
**`DASHBOARD_ALLOWED_HOSTS`** (comma-separated).

### Database Configuration (db.js)

```javascript
// SQLite connection options
const db = new Database(DB_PATH, {
  verbose: process.env.NODE_ENV === 'development' ? console.log : undefined,
  fileMustExist: false
});

// Performance pragmas
db.pragma('journal_mode = WAL');  // Write-Ahead Logging
db.pragma('synchronous = NORMAL'); // Faster writes
db.pragma('cache_size = -64000');  // 64MB cache
db.pragma('temp_store = MEMORY');  // Temp tables in memory
```

### WebSocket Configuration (websocket.js)

```javascript
const wss = new WebSocketServer({
  server: httpServer,
  path: '/ws',
  clientTracking: true,
  maxPayload: 1024 * 1024 // 1MB max message size
});

// Heartbeat interval
const HEARTBEAT_INTERVAL = 30000; // 30s
```

---

## Summary

The server is production-ready with:

- 🚀 **High Performance** - Sub-5ms hook processing, prepared statements, WAL mode
- 📊 **Comprehensive API** - RESTful endpoints for all data access
- ⚡ **Real-time Updates** - WebSocket broadcasting with heartbeat
- 🗄️ **Robust Storage** - SQLite with indexes, migrations, transactions
- 💰 **Flexible Pricing** - Custom pricing rules with pattern matching
- 🧪 **Well Tested** - Integration tests with Node.js test runner
- 🔒 **Secure** - Prepared statements, input validation, loopback bind by default, Host-header allowlist, loopback-only CORS, optional `DASHBOARD_TOKEN` auth
- 📈 **Scalable** - Handles 1000s of sessions, 100+ concurrent clients

For client documentation, see [client/README.md](../client/README.md).
