> For the complete documentation index, see [llms.txt](https://docs.fortemis.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fortemis.io/architecture.md).

# Architecture

The platform runs entirely inside a dedicated AWS organisation (eu-west-1), deployed by Terraform with no manual console changes in production, no IAM users and no long-lived cloud credentials.

## Planes

**Tenant plane** — each fund (tenant) has its own PostgreSQL schema, its own database role, and its own encrypted secrets. Isolation is enforced by the database itself: a tenant's role physically cannot read another tenant's data, and the platform's automated tests prove it on every merge.

**Shared market-data plane** — prices, volumes and spreads are tenant-agnostic and stored once, as date-partitioned Parquet in S3. No shared-plane function accepts a tenant identifier — the boundary is structural.

**Immutable evidence plane** — every run's manifest is written to an S3 bucket with Object Lock (compliance mode). Even an administrator cannot delete or shorten retention; we verified this by trying.

## Services

| Component     | Role                                                                                              | Cadence   |
| ------------- | ------------------------------------------------------------------------------------------------- | --------- |
| Live service  | Panel, client app, 30-minute position polling, live risk recomputation on every price tick        | Always on |
| Ops console   | Cross-tenant health grid, run register, data-quality feed (internal, read-only by database grant) | Always on |
| Nightly batch | Market-data fetch, official VaR strike, reports, reproducibility verification, reconciliation     | 00:15 UTC |

## Tiers of figures

**Tier 1 (struck)** — the official nightly record: computed at a fixed valuation instant, persisted with its manifest, reproducible forever.

**Tier 2 (live/indicative)** — the intraday view: positions refreshed every 30 minutes from venue APIs, revalued continuously against live prices. Always labelled *indicative*; never mixed with Tier 1 in any table, route or report.


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