diff --git a/packages/core/src/session/projector.ts b/packages/core/src/session/projector.ts
index 49000550db..84a14dbdb4 100644
--- a/packages/core/src/session/projector.ts
+++ b/packages/core/src/session/projector.ts
@@ -7,6 +7,7 @@ import { Bus } from "../bus"
 import { makeGlobalNode } from "@opencode-ai/util/effect/app-node"
 import { Model } from "../model"
 import { SessionEvent } from "./event"
+import type { SessionSchema } from "./schema"
 import { SessionV1 } from "../v1/session"
 import { WorkspaceTable } from "../control-plane/workspace.sql"
 import { SessionMessage } from "./message"
@@ -447,12 +448,33 @@ function run(db: DatabaseService, event: MessageEvent) {
 function runAndTouch(db: DatabaseService, event: MessageEvent) {
   return Effect.gen(function* () {
     yield* run(db, event)
+    yield* touchAncestors(db, event.data.sessionID, DateTime.toEpochMillis(event.created))
+  })
+}
+
+function touchAncestors(
+  db: DatabaseService,
+  sessionID: SessionSchema.ID,
+  updated: number,
+  seen = new Set<string>(),
+): Effect.Effect<void> {
+  if (seen.has(sessionID)) return Effect.void
+  seen.add(sessionID)
+  return Effect.gen(function* () {
+    const session = yield* db
+      .select({ parentID: SessionTable.parent_id })
+      .from(SessionTable)
+      .where(eq(SessionTable.id, sessionID))
+      .get()
+      .pipe(Effect.orDie)
+    if (!session) return
     yield* db
       .update(SessionTable)
-      .set({ time_updated: DateTime.toEpochMillis(event.created) })
-      .where(eq(SessionTable.id, event.data.sessionID))
+      .set({ time_updated: updated })
+      .where(and(eq(SessionTable.id, sessionID), lt(SessionTable.time_updated, updated)))
       .run()
       .pipe(Effect.orDie)
+    if (session.parentID) yield* touchAncestors(db, session.parentID, updated, seen)
   })
 }
 
diff --git a/packages/core/test/session-projector.test.ts b/packages/core/test/session-projector.test.ts
index f2b898c442..1395493c1d 100644
--- a/packages/core/test/session-projector.test.ts
+++ b/packages/core/test/session-projector.test.ts
@@ -1,6 +1,6 @@
 import { describe, expect } from "bun:test"
 import { DateTime, Effect, Fiber, Option, Schema, Stream } from "effect"
-import { asc, eq, sql } from "drizzle-orm"
+import { asc, eq, inArray, sql } from "drizzle-orm"
 import { Database } from "@opencode-ai/core/database/database"
 import { Agent } from "@opencode-ai/core/agent"
 import { LayerNode } from "@opencode-ai/util/effect/layer-node"
@@ -659,7 +659,6 @@ describe("SessionProjector", () => {
           directory: "/project",
           title: "test",
           version: "test",
-          time_updated: -1,
         })
         .run()
         .pipe(Effect.orDie)
@@ -671,23 +670,63 @@ describe("SessionProjector", () => {
           .where(eq(SessionTable.id, sessionID))
           .get()
           .pipe(Effect.orDie)
-      const updated = () =>
-        db
-          .select({ value: SessionTable.time_updated })
-          .from(SessionTable)
-          .where(eq(SessionTable.id, sessionID))
-          .get()
-          .pipe(Effect.orDie)
 
       yield* bus.publish(SessionEvent.Execution.Interrupted, { sessionID, reason: "shutdown" })
       expect((yield* suspended())?.timeSuspended).toBeNull()
-      expect((yield* updated())?.value ?? -1).toBeGreaterThan(-1)
 
       yield* bus.publish(SessionEvent.Execution.Started, { sessionID })
       expect((yield* suspended())?.timeSuspended).toBeNull()
     }),
   )
 
+  it.effect("rolls terminal execution activity through every session ancestor", () =>
+    Effect.gen(function* () {
+      const { db } = yield* Database.Service
+      yield* db
+        .insert(ProjectTable)
+        .values({ id: Project.ID.global, worktree: AbsolutePath.make("/project"), sandboxes: [] })
+        .run()
+        .pipe(Effect.orDie)
+      const root = Session.ID.make("ses_activity_root")
+      const child = Session.ID.make("ses_activity_child")
+      const grandchild = Session.ID.make("ses_activity_grandchild")
+      yield* db
+        .insert(SessionTable)
+        .values(
+          [
+            { id: root },
+            { id: child, parent_id: root },
+            { id: grandchild, parent_id: child },
+          ].map((session) => ({
+            ...session,
+            project_id: Project.ID.global,
+            slug: session.id,
+            directory: "/project",
+            title: "test",
+            version: "test",
+            time_updated: -1,
+          })),
+        )
+        .run()
+        .pipe(Effect.orDie)
+
+      yield* (yield* Bus.Service).publish(SessionEvent.Execution.Interrupted, {
+        sessionID: grandchild,
+        reason: "shutdown",
+      })
+
+      const rows = yield* db
+        .select({ id: SessionTable.id, updated: SessionTable.time_updated })
+        .from(SessionTable)
+        .where(inArray(SessionTable.id, [root, child, grandchild]))
+        .all()
+        .pipe(Effect.orDie)
+      expect(rows).toHaveLength(3)
+      expect(rows.every((row) => row.updated > -1)).toBe(true)
+      expect(new Set(rows.map((row) => row.updated)).size).toBe(1)
+    }),
+  )
+
   it.effect("updates only the newest incomplete assistant projection", () =>
     Effect.gen(function* () {
       const { db } = yield* Database.Service