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deepseek-harness/packages/session/session-projection-cache/src/spec.ts
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TypeScript

/**
* The session-projcache domain declaration: one `sessions` table keyed by
* {@link SessionId}, each record the full projection checkpoint for one
* session (`key → {ver, seq, val}` rows). The spec object
* is the single source of the domain's identity, version, and record schema;
* the storage-domain routing decides the medium (the shipped composition's
* json backend lands it at `<root>/session_projcache.json`, beside
* `workspace.json`).
* @module @deepseek-ai/dsh-session-projection-cache/src/spec
*/
import { z } from 'zod'
import { SessionId } from '@deepseek-ai/dsh-session'
import { defineDomain, domainTable } from '@deepseek-ai/dsh-storage-domain'
/**
* One persisted checkpoint row (the RFC's `(sessionId, key, ver, seq, val)`
* minus the two record keys). `val` is the unit's internal state — plain
* JSON by the unit contract; `z.json()` enforces that at the durable
* boundary. A row is never wrong, only possibly stale: `seq` says exactly
* how stale, and a `ver` mismatch against the live unit's `stateVersion`
* discards it at read time (never a migration).
*/
export const checkpointRow = z.object({
ver: z.number().int().nonnegative(),
seq: z.number().int().gte(-1),
val: z.json(),
})
/**
* The stored-log identity a record is bound to: the immutable header fields
* that distinguish one session lifecycle from another under the same id. A
* session id names a slot, not a lifecycle — a deleted-then-recreated id, or
* a persistence root swapped under a surviving cache, would otherwise let an
* old row pass every watermark check and seed state folded from an unrelated
* log. Reads validate this against the live header (listing) or the stored
* header (cold read) before accepting any row.
*/
export const checkpointIdentity = z.object({
createdAt: z.number().int().nonnegative(),
cwd: z.string().optional(),
})
/** The identity fields a record is bound to, inferred from {@link checkpointIdentity}. */
export type CheckpointIdentity = z.infer<typeof checkpointIdentity>
/**
* One session's stored record: the log identity it was folded from plus its
* checkpoint rows keyed by projection key. The whole record is replaced on
* every write (whole-value discipline — the registry checkpoint is always
* the complete per-session cut).
*/
export const checkpointRecord = z.object({
identity: checkpointIdentity,
rows: z.record(z.string(), checkpointRow),
})
/** One stored per-session checkpoint record, inferred from {@link checkpointRecord}. */
export type CheckpointRecord = z.infer<typeof checkpointRecord>
/**
* The session-projcache domain spec. Version bumps discard the whole medium
* (cache semantics: a stale or unreadable cache costs a longer tail replay,
* never a wrong value).
*/
export const projectionCacheDomainSpec = defineDomain({
name: 'session_projcache',
version: 3,
tables: { sessions: domainTable<SessionId, CheckpointRecord>(checkpointRecord) },
})