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refactor(core): simplify system context into a belief model (#34917)

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Kit Langton 2026-07-02 09:32:35 -04:00 • committed by GitHub
commit 4045041554
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40 changed files with 914 additions and 805 deletions
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packages/core/src/session/projector.ts
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@ -12,8 +12,15 @@ import { SessionMessage } from "./message"
import { SessionMessageUpdater } from "./message-updater"
import { SessionInput } from "./input"
import { WorkspaceV2 } from "../workspace"
import { SessionContextEpoch } from "./context-epoch"
import { MessageTable, PartTable, SessionInputTable, SessionMessageTable, SessionTable } from "./sql"
import { SessionContextCheckpoint } from "./context-checkpoint"
import {
MessageTable,
PartTable,
SessionContextCheckpointTable,
SessionInputTable,
SessionMessageTable,
SessionTable,
} from "./sql"
import type { DeepMutable } from "../schema"
import { Slug } from "../util/slug"
@ -156,12 +163,16 @@ const projectFork = Effect.fn("SessionProjector.projectFork")(function* (
.select({ seq: SessionMessageTable.seq })
.from(SessionMessageTable)
.where(
and(eq(SessionMessageTable.session_id, event.data.parentID), eq(SessionMessageTable.id, event.data.messageID)),
and(
eq(SessionMessageTable.session_id, event.data.parentID),
eq(SessionMessageTable.id, event.data.messageID),
),
)
.get()
.pipe(Effect.orDie)
: undefined
if (event.data.messageID && !boundary) return yield* Effect.die(`Fork boundary message not found: ${event.data.messageID}`)
if (event.data.messageID && !boundary)
return yield* Effect.die(`Fork boundary message not found: ${event.data.messageID}`)
const copied = yield* db
.select({ seq: SessionMessageTable.seq })
.from(SessionMessageTable)
@ -206,6 +217,23 @@ const projectFork = Effect.fn("SessionProjector.projectFork")(function* (
.pipe(Effect.orDie)
if (!stored) return yield* Effect.die(new SessionAlreadyProjected())
// The fork inherits the parent's transcript, so it inherits the context
// checkpoint that transcript was built against: copied message seqs keep
// folding at the same baseline horizon.
const checkpoint = yield* db
.select()
.from(SessionContextCheckpointTable)
.where(eq(SessionContextCheckpointTable.session_id, event.data.parentID))
.get()
.pipe(Effect.orDie)
if (checkpoint) {
yield* db
.insert(SessionContextCheckpointTable)
.values({ ...checkpoint, session_id: event.data.sessionID })
.run()
.pipe(Effect.orDie)
}
const usage = emptyUsage()
let cursor = -1
while (true) {
@ -452,7 +480,7 @@ const layer = Layer.effectDiscard(
.where(eq(SessionTable.id, event.data.sessionID))
.run()
.pipe(Effect.orDie)
yield* SessionContextEpoch.reset(db, event.data.sessionID)
yield* SessionContextCheckpoint.reset(db, event.data.sessionID)
}),
)
yield* events.project(SessionV1.Event.Deleted, (event) =>
@ -666,7 +694,7 @@ const layer = Layer.effectDiscard(
.where(eq(SessionTable.id, event.data.sessionID))
.run()
.pipe(Effect.orDie)
yield* SessionContextEpoch.reset(db, event.data.sessionID)
yield* SessionContextCheckpoint.reset(db, event.data.sessionID)
}),
)
}),