omnigraph/docs/user/schema/index.md
Andrew Altshuler 9c792649e2
docs(user): coherence cleanup aligned with 0.7.1 (#293)
* docs(cli): fix cluster apply semantics — converges graphs+schema, not config-only

`cluster apply` creates graphs, applies schema updates (soft drops), writes
stored-query/policy catalog resources, and executes approved graph deletes in
one ordered run. Both the user docs and the shipped CLI help text still
described it as a "Stage 3A" config-only (query/policy) subset that defers
graph/schema changes "to a later stage" — wrong since the graph/schema executor
landed.

- docs/user/cli/reference.md: rewrite the cluster paragraph to describe apply's
  actual converge behavior; keep deferred for the genuinely-unsupported case
  (standalone schema deletes); drop the stale "Stage 3A" / "reserved for later
  stages" framing.
- crates/omnigraph-cli/src/cli.rs: fix the `cluster apply` help text to match.

Part of the docs/user coherence cleanup (docs/dev/docs-issues.md, P1).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FQ1Hf4eXLsJmeLUkTYBEw7

* docs(server): align stored-query exposure with cluster-only behavior

server.md documented a per-query expose knob ("`mcp.expose` defaults to true;
set `mcp: { expose: false }` to hide from the catalog") that does not exist in
the only deployment mode. Cluster-only serving lists every stored query: the
cluster registry has no expose field (`QueryConfig { file }`) and the boot
bridge hardcodes `expose: true` for all cluster queries
(omnigraph-server settings), and there is no GQ-level expose annotation. This
contradicted clusters/config.md, which already states the correct behavior.

Replace the knob bullet with the cluster truth (every applied query is listed;
per-query exposure may become a Cedar-policy decision later) and drop the
"`mcp.expose` stored queries" phrasing from the catalog description, the
endpoint table, and the intro. The `mcp_expose` JSON catalog field is unchanged
(still emitted, always true in cluster mode).

Part of the docs/user coherence cleanup (docs/dev/docs-issues.md, P1).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FQ1Hf4eXLsJmeLUkTYBEw7

* docs(schema): split direct/embedded vs cluster-managed schema apply

schema/index.md claimed `allow_data_loss` is "honored uniformly across
transports" and listed HTTP `POST /schema/apply` among them. But that route is
409-disabled for cluster-backed serving (already documented in server.md), and
cluster-managed graphs evolve only through `cluster apply` with soft drops —
there is no cluster HTTP data-loss path.

Scope the data-loss flag to the direct/embedded path (`schema apply --store`,
SDK), and add a paragraph: cluster-managed graphs use `cluster apply`
(soft drops only); HTTP `POST /schema/apply` is 409 for cluster serving; direct
apply against a cluster-managed path is refused. Cross-refs server + cluster
docs.

Part of the docs/user coherence cleanup (docs/dev/docs-issues.md, P2).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FQ1Hf4eXLsJmeLUkTYBEw7

* docs(server): document /load as canonical in limits + admission prose

The endpoint table already listed both `/load` (canonical) and `/ingest`
(deprecated alias) at 32 MB, but the admission-control, body-limit,
rate-limit, and manifest-conflict prose named only `/ingest` — and the
constants page called the limit "Ingest body limit". Add `/load` alongside (or
ahead of) `/ingest` everywhere, and rename the constant to "Load (bulk-write)
body limit" noting the `/ingest` alias shares it.

Part of the docs/user coherence cleanup (docs/dev/docs-issues.md, P2).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FQ1Hf4eXLsJmeLUkTYBEw7

* docs(cli): drop stale bearer-token keys + fix version string

The "Bearer token resolution (CLI)" section still listed removed omnigraph.yaml
keys (`graphs.<name>.bearer_token_env`, `auth.env_file`) — config surfaces that
no longer exist and that implied plaintext tokens in config. Replace it with a
pointer to the keyed-credential model documented above
(`OMNIGRAPH_TOKEN_<NAME>` → `~/.omnigraph/credentials` →
`OMNIGRAPH_BEARER_TOKEN`). Also fix the `version` row: the CLI prints 0.7.x, not
0.3.x.

Part of the docs/user coherence cleanup (docs/dev/docs-issues.md, P2 + smaller).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FQ1Hf4eXLsJmeLUkTYBEw7

* docs: route-spelling note + drop stale stage/deferred crumbs

- server.md: add a one-line note that the per-graph subsections name routes in
  shorthand (`GET /queries`, `POST /query`, `POST /mutate`,
  `POST /queries/{name}`) but every one is served under `/graphs/{id}/…` — the
  endpoint table is already fully-qualified.
- clusters/config.md: redefine the `deferred` plan disposition as an unsupported
  change (e.g. a standalone schema delete) instead of "graph/schema change,
  later phase" (graph creates and schema updates apply now); drop the "Stage 2C"
  label from the lock-recovery note.
- search/indexes.md: `ingest --mode merge` → canonical `load --mode merge`.

Part of the docs/user coherence cleanup (docs/dev/docs-issues.md, P2 + smaller).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FQ1Hf4eXLsJmeLUkTYBEw7

* docs(dev): track user-docs coherence ledger; mark 2026-06-20 findings resolved

Convert the scratch review notes into a tracked living ledger and link it from
the dev index. All ten findings from the 2026-06-20 docs/user sweep are
validated and fixed in this branch (P1 cluster-apply semantics + stored-query
exposure; P2 schema-apply paths, /load canonical, bearer-token keys, route
shorthand; plus version/ingest/deferred/stage crumbs). The verification grep
checklist is retained for future audits.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FQ1Hf4eXLsJmeLUkTYBEw7

* docs(api): align GET /queries OpenAPI contract with cluster-only behavior

Greptile P1 on #293: the prose fix in server.md left the OpenAPI surface stale.
The utoipa annotations (handlers.rs, omnigraph-api-types QueriesCatalogOutput)
still described the catalog as "the `mcp.expose == true` subset", and those
drive the checked-in openapi.json — so SDK consumers read a contract the
cluster-only server does not honor (it lists every stored query).

Update the three Rust doc-comment/annotation strings to "every stored query"
and regenerate openapi.json (OMNIGRAPH_UPDATE_OPENAPI=1; drift test green) in
the same change, per AGENTS.md rule 4. Ledger updated: this finding resolved,
plus the cross-repo drift it surfaced (omnigraph-ts generated spec/types and
omnigraph-cookbooks best-practices bearer_token_env) tracked as open follow-ups.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FQ1Hf4eXLsJmeLUkTYBEw7

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-21 00:02:34 +03:00

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Markdown

# Schema Language (`.pg`)
## Top-level declarations
- `interface <Name> { property* }` — reusable property contracts.
- `node <Name> [implements <Iface>, ...] { property* | constraint* }`
- `edge <Name>: <FromType> -> <ToType> [@card(min..max)] { property* | constraint* }`
- Comments: line `//` and block `/* … */`.
## Property declarations
`<ident>: <TypeRef> [annotation*]`
## Built-in scalar types
| Scalar | Arrow type |
|---|---|
| `String` | Utf8 |
| `Blob` | LargeBinary |
| `Bool` | Boolean |
| `I32` / `I64` | Int32 / Int64 |
| `U32` / `U64` | UInt32 / UInt64 |
| `F32` / `F64` | Float32 / Float64 |
| `Date` | Date32 |
| `DateTime` | Date64 |
| `Vector(<dim>)` | FixedSizeList(Float32, dim), `1 ≤ dim ≤ i32::MAX` |
| `[<scalar>]` | List(scalar) |
| `enum(v1, v2, …)` | Utf8 with sorted/dedup'd set of allowed string values |
| `<scalar>?` | Same as scalar but `nullable: true` |
## Constraints (body level)
| Constraint | On | Effect |
|---|---|---|
| `@key(p, …)` | node | Primary key; implies index on key columns; `key_property()` returns the first key |
| `@unique(p, …)` | node, edge | Uniqueness across listed columns |
| `@index(p, …)` | node, edge | Build a scalar (BTREE) index on the columns |
| `@range(p, min..max)` | node | Numeric range validation (open ranges allowed) |
| `@check(p, "regex")` | node | Regex pattern validation |
| `@card(min..max?)` | edge | Edge multiplicity — default `0..*`; `0..1`, `1..1`, `1..*`, etc. |
Edge bodies only allow `@unique` and `@index`.
## Annotations
- `@<ident>` or `@<ident>(<literal>)` on any declaration or property.
- Known annotations:
- `@embed("source_property")` on a Vector property — records which String property is the embedding source for query-time `nearest($v, "string")` auto-embedding. It is a catalog annotation; it does **not** populate the vector at ingest (supply vectors in load data, or pre-fill via the offline `omnigraph embed` pipeline). An optional `model="…"` kwarg (`@embed("source_property", model="openai/text-embedding-3-large")`) records the embedding model so a `nearest()` query whose embedder uses a different model is rejected loudly; `model` is the only supported kwarg. See [search/embeddings.md](../search/embeddings.md).
- `@description("…")`, `@instruction("…")` on query declarations (carried through to clients).
- Custom annotations are accepted by the parser and surfaced in catalog metadata; unrecognized annotations don't fail compilation.
## Table layout
- Each node type compiles to a table with an `id: Utf8` column plus all declared properties (blob columns are stored as `LargeBinary`); `implements` clauses expand the interface's properties into the node.
- Each edge type compiles to a table with `id: Utf8, src: Utf8, dst: Utf8` plus the edge's own properties. Edge endpoint types (`from`/`to`) must exist, and edge names are matched case-insensitively.
## Schema migration planning
A migration plan compares the accepted schema against the desired one and reports whether the change is supported plus the ordered steps it requires:
- Add a type
- Rename a type
- Add a property
- Rename a property
- Add a constraint
- Update type or property metadata (annotations)
- Unsupported change (reports the entity and reason; forces the plan to unsupported)
Applying a plan reports whether it was supported, the steps applied, and the resulting manifest version. Concurrent schema applies serialize so they can't interleave.
## Destructive drops — `--allow-data-loss`
`DropProperty` and `DropType` steps default to `Soft` mode: the catalog tombstones the entry but the prior column / dataset remains time-travel-reachable via `snapshot_at_version(prev)` until `omnigraph cleanup` runs. Soft drops are reversible.
Pass `--allow-data-loss` (CLI `schema apply`) or `allow_data_loss: true` (SDK `SchemaApplyOptions`) to promote every drop in the plan to `Hard` mode. Hard drops run `cleanup_old_versions` on the affected dataset immediately after the manifest publish, making the prior column / dataset unreachable. **Irreversible.**
This is the **direct/embedded** schema-apply path — `omnigraph schema apply --store …` and the embedded SDK `apply_schema_with_options(.., SchemaApplyOptions { allow_data_loss: true })` produce identical plans and identical effects.
**Cluster-managed graphs are different.** A graph served from a cluster evolves only through `omnigraph cluster apply`, which performs **soft drops only** (no `allow_data_loss` path), and the HTTP `POST /schema/apply` route is **disabled (returns 409) for cluster-backed serving** — see [server](../operations/server.md) and [cluster-config](../clusters/config.md). Direct `schema apply` against a cluster-managed storage path is likewise refused.