docs: make technical prose concrete
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@@ -29,10 +29,10 @@ interface StorageForms {}
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/**
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* One registered backend. A backend owns exactly one medium and shares its
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* lifecycle across all facets; facets are optional members — a backend that
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* cannot serve a shape simply omits it, and resolution fails loud instead.
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* cannot serve a data kind simply omits it, and resolution fails loud instead.
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*/
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interface StorageBackend {
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/** Key-value data shape; absent when this backend cannot serve it. */
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/** Key-value operations; absent when this backend cannot serve them. */
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readonly kv?: KvFacet
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/**
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@@ -44,7 +44,7 @@ interface StorageBackend {
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}
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```
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A backend owns one medium (a file-tree root, a database file) and exposes optional data-shape facets; `kv` is the sole facet. `KvFacet.open(descriptor)` opens one named unit — `KvUnitDescriptor` carries the name, format version, table names, and whether a global singleton slot exists — and returns a `KvUnit` with `loadAll`, `putRecord`, `deleteRecord`, `setGlobal`, and `close`. Unit and table names must match `UNIT_NAME_RE` (safe as a file name and as a SQL identifier segment); record keys are arbitrary strings that never reach file paths. A unit does not serialize concurrent writes — ordering belongs to the caller — but each single call is atomic on the medium and durable once resolved. A medium stamped with a different version rejects `version-mismatch`; one that cannot be parsed as the unit rejects `malformed-medium` (no migration, pre-release stance). [`backend.ts`](../../packages/storage/storage/src/backend.ts) is the normative clause-by-clause contract, and the shared conformance suite in [`tests/contract.ts`](../../packages/storage/storage/tests/contract.ts) asserts every clause against each backend. The [json backend](../../packages/storage/storage-json/README.md) republishes one whole human-readable file per unit atomically; the [sqlite backend](../../packages/storage/storage-sqlite/README.md) stores document-per-row in one database, the route for high-churn domains.
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A backend owns one medium (a file-tree root, a database file) and exposes optional operation groups; `kv` is the only group today. `KvFacet.open(descriptor)` opens one named unit — `KvUnitDescriptor` carries the name, format version, table names, and whether a global singleton slot exists — and returns a `KvUnit` with `loadAll`, `putRecord`, `deleteRecord`, `setGlobal`, and `close`. Unit and table names must match `UNIT_NAME_RE` (safe as a file name and as a SQL identifier segment); record keys are arbitrary strings that never reach file paths. A unit does not serialize concurrent writes — ordering belongs to the caller — but each single call is atomic on the medium and durable once resolved. A medium stamped with a different version rejects `version-mismatch`; one that cannot be parsed as the unit rejects `malformed-medium` (no migration, pre-release stance). [`backend.ts`](../../packages/storage/storage/src/backend.ts) is the normative clause-by-clause contract, and the shared conformance suite in [`tests/contract.ts`](../../packages/storage/storage/tests/contract.ts) checks every clause against each backend. The [json backend](../../packages/storage/storage-json/README.md) republishes one whole human-readable file per unit atomically; the [sqlite backend](../../packages/storage/storage-sqlite/README.md) stores one document per row in one database for frequently updated data.
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## Declaring a domain
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