# Configuration

Runtime configuration sources, in override order (later wins for overlapping
keys):

1. `.env` file / container environment variables (startup only)
2. `app_settings` table (live, editable from Admin Panel with 2-minute cache)

## Environment variables

### Core (production-required)

| Variable | Purpose |
|---|---|
| `APP_URL` | Public base URL. Enables production mode — fail-closed CORS, HSTS, secure cookies. |
| `JWT_SECRET` | HMAC key for JWT signing and OIDC state. Server refuses to start without it in production. |
| `DATA_ENCRYPTION_KEY` | AES-256-GCM key for PHI at rest (Nextcloud tokens, audio backups). 64 hex chars (`openssl rand -hex 32`). Refuses to start without it in production. |
| `DB_PASSWORD` / `DATABASE_URL` | Postgres password or full connection string. |
| `PORT` | HTTP listen port (default 3000). |
| `NODE_ENV` | `production` forces prod-only guards on even without `APP_URL`. |

### CORS

| Variable | Purpose |
|---|---|
| `CORS_ORIGINS` | Comma-separated additional allowed origins beyond `APP_URL`. |

### AI provider

| Variable | Purpose |
|---|---|
| `AI_PROVIDER` | `openrouter` / `bedrock` / `azure` / `vertex` / `litellm`. If unset, the startup loader uses configured credentials and the last initialized provider in Bedrock → Azure → Vertex → LiteLLM order wins; otherwise OpenRouter is the default. |
| `OPENROUTER_API_KEY` | OpenRouter key (not HIPAA-eligible). |
| `AWS_BEDROCK_REGION`, `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY` | Bedrock chat provider. |
| `AZURE_OPENAI_ENDPOINT`, `AZURE_OPENAI_API_KEY`, `AZURE_DEPLOYMENT_NAME`, `AZURE_OPENAI_API_VERSION` | Azure OpenAI. |
| `GOOGLE_VERTEX_PROJECT`, `GOOGLE_VERTEX_LOCATION`, `GOOGLE_APPLICATION_CREDENTIALS` | Vertex AI chat provider. |
| `LITELLM_API_BASE`, `LITELLM_API_KEY` | OpenAI-compatible AI gateway (Bifrost, LiteLLM, or similar). |

### Speech-to-text

| Variable | Purpose |
|---|---|
| `TRANSCRIBE_PROVIDER` | Use `litellm`; auto mode uses LiteLLM when configured. |
| `LITELLM_STT_MODEL` | Model name for LiteLLM-routed STT. |

### Text-to-speech

| Variable | Purpose |
|---|---|
| `LITELLM_TTS_MODEL`, `LITELLM_TTS_VOICE` | LiteLLM-routed TTS model and default voice. |
| `LITELLM_TTS_VOICES` | Comma-separated LiteLLM-compatible voices exposed in voice search and user preferences. |

### Embeddings

| Variable | Purpose |
|---|---|
| `EMBEDDING_MODEL` | LiteLLM embedding model name (default `openai-text-embedding-3-large`). |
| `EMBEDDING_DIMENSIONS` | Vector dimensions (default 3072). |

### Email (SMTP)

| Variable | Purpose |
|---|---|
| `SMTP_HOST`, `SMTP_PORT`, `SMTP_USER`, `SMTP_PASS`, `SMTP_FROM` | SMTP config for verification + password reset emails. Overridable per-instance via `app_settings`. |

### Security / external

| Variable | Purpose |
|---|---|
| `TURNSTILE_SITE_KEY`, `TURNSTILE_SECRET_KEY` | Cloudflare Turnstile. Turnstile check is no-op when secret is unset. |
| `LOKI_URL` | Optional Loki ingest URL for shipping audit/api/access logs. |
| `NTFY_URL`, `NTFY_TOPIC` | Optional ntfy push for new-login / password-change notifications. |

### Integrations

| Variable | Purpose |
|---|---|
| `NEXTCLOUD_URL` | Nextcloud base URL (per-user credentials entered in app). |
| `S3_BUCKET`, `S3_REGION`, `S3_PREFIX`, `S3_ENDPOINT`, `S3_ACCESS_KEY_ID`, `S3_SECRET_ACCESS_KEY`, `S3_FORCE_PATH_STYLE` | Document object storage. `S3_FORCE_PATH_STYLE=true` for MinIO, Backblaze B2, most non-AWS providers. |

## `app_settings` — live runtime configuration

Key-value rows in the `app_settings` table. Read via `config.get(key, default)`
with 2-minute in-memory cache. Writes invalidate the cache immediately.

### Registration & site

| Key | Purpose |
|---|---|
| `registration_enabled` | `true`/`false`. Gate new signups. |
| `site.name` | Display name. |
| `site.auto_delete_days` | Days before encounters auto-expire (default 7). |

### Announcements

| Key | Purpose |
|---|---|
| `announcement.text` | Banner text. Empty = banner hidden. |
| `announcement.type` | `info` / `warning` / `error` / `success`. |

### SMTP overrides (override env)

`smtp.host`, `smtp.port`, `smtp.user`, `smtp.pass`, `smtp.from`.

### Email templates

`email.{flow}.subject`, `email.{flow}.body` where `{flow}` is
`verify` / `reset` / `new_login` / `password_changed`.

### OIDC / SSO

| Key | Purpose |
|---|---|
| `oidc.enabled` | Toggle SSO. |
| `oidc.issuer` | OIDC issuer URL. |
| `oidc.client_id`, `oidc.client_secret` | OAuth client credentials. |
| `oidc.button_label` | Login-page button text (default "Sign in with SSO"). |
| `oidc.disable_local_auth` | Hide local login form when SSO is enabled. |
| `oidc.allowed_ips` | CIDR whitelist for SSO (optional). |

### AI / models / prompts

| Key | Purpose |
|---|---|
| `models.default` | Default model ID. |
| `models.disabled` | JSON array of disabled model IDs. |
| `models.custom` | JSON array of admin-added models. |
| `ai.allow_model_fallback` | Enable silent fallback to secondary model on primary failure. **Default false** — fallback could spill to a non-BAA provider. |
| `stt.model`, `tts.model`, `tts.voice` | System-wide STT/TTS defaults (users can override per-account). |
| `prompt.{name}` | Prompt overrides. Any template in `src/utils/prompts.js` can be replaced live. |
| `embeddings.model`, `embeddings.dimensions` | Override embedding config. |

### Feature flags

`feature.*` — any key matching this prefix can be consulted via `config.get('feature.foo')`.

### Internal migration flags

| Key | Purpose |
|---|---|
| `migration.text_indexes_c` | Set to `'true'` once lookup-critical text indexes have been converted to `COLLATE "C"`. Prevents re-running. |

## Admin panel

The Admin Panel (`/admin` route, admin-only) exposes everything above plus:

- User list: verify, disable, delete, promote to admin/moderator.
- Session viewer: active sessions per user, admin-revoke.
- Logs: audit / api / access tables with filtering.
- Detailed health: `/api/health/detailed` reports configured providers
  (admin-only; the public `/api/health` returns only `{ok: true}` to avoid
  leaking stack info).
- Model management: enable/disable, add custom, set default, discover from
  provider.
- Prompt editor: live-edit any `PROMPTS.*` key.
- Test SMTP / test STT / test TTS.

## Switching AI gateways

The `LITELLM_API_BASE` and `LITELLM_API_KEY` variables work with any
OpenAI-compatible gateway — LiteLLM, Bifrost, or other proxies.

### Migration steps

1. **Set the base URL** — `LITELLM_API_BASE` should include `/v1` if the
   gateway serves on that path (e.g., `https://gateway.example.com/v1`).
   The application normalizes double `/v1` paths internally for TTS, STT,
   and embedding endpoints.

2. **Set the API key** — `LITELLM_API_KEY` accepts any key format the
   gateway issues (virtual keys, bearer tokens, etc.).

3. **Update model names** — Different gateways use different naming
   conventions. Bifrost requires `provider/model` format
   (e.g., `openrouter/gpt-4.1`), while LiteLLM can use deployment aliases
   (e.g., `openrouter-gpt-4.1`). Update model names in:
   - Admin Panel → Models (chat models)
   - Admin Panel → Settings → `stt.model` (speech-to-text)
   - Admin Panel → Settings → `tts.model` (text-to-speech)
   - `LITELLM_TTS_MODEL` env var (if set)

4. **Embedding model** — Set via Admin Panel → Settings →
   `embeddings.model`. The embedding vector column is `VECTOR(768)`, so
   any model producing 768 dimensions works without re-embedding
   (e.g., `vertex/text-embedding-005`). Switching to a model with
   different dimensions requires altering the column and re-embedding all
   content.

5. **Restart the container** — `docker compose up -d --force-recreate` to
   pick up `.env` changes (a plain `restart` does not re-read `.env`).

### Verified gateways

| Gateway | Model format | Notes |
|---|---|---|
| Bifrost | `provider/model` | Virtual keys, semantic caching, MCP gateway |
| LiteLLM | Custom aliases | Requires PostgreSQL + Redis |
| Any OpenAI-compatible | Varies | Must serve `/v1/chat/completions`, `/v1/audio/speech`, `/v1/audio/transcriptions`, `/v1/embeddings` |
