fix(schedule): validate restored seed logs

packages/schedule/tool-schedule/src/invariant.ts

@@ -32,6 +32,9 @@ const install: InvariantInstaller = Object.assign((ctx: Context, fail: Invariant
   for (const session of ctx.sessions.list()) {
     validate(session.events, session.header.seedLength ?? 0, fail)
   }
+  ctx.on('session/created', (session) => {
+    validate(session.events, session.header.seedLength ?? 0, fail)
+  }, { global: true })
   ctx.on('internal/dispatch', (_mode, eventName, args) => {
     if (eventName !== 'session/event') return
     const [session, event] = args as [Session, SessionEvent]

packages/schedule/tool-schedule/tests/invariant.spec.ts

@@ -64,6 +64,16 @@ describe('Schedule package invariant', () => {
     await ctx.fiber.dispose()
   })
 
+  it('rejects a malformed seeded session created after companion setup', async () => {
+    const { ctx } = await harness()
+    const id = SessionId('schedule-invalid-future-seed')
+    expect(() => ctx.sessions.create(id, {
+      seed: [event({ version: 9, operation: 'delete', id: 'schedule-1' }, 0)],
+    })).toThrow(InvariantError)
+    expect(ctx.sessions.get(id)).toBeUndefined()
+    await ctx.fiber.dispose()
+  })
+
   it('ignores inherited Schedule events before a fork seed boundary', async () => {
     const ctx = new Context()
     await ctx.plugin(SessionStore)