fix(sessions): 修复压缩续接会话详情为空 (#218)

Session detail now prefers DB-backed reconstruction for compressed continuation chains, with CLI fallback preserved and pending-deletion guard covered by tests.

tests/server/sessions-controller.test.ts

@@ -4,6 +4,9 @@ const listConversationSummariesFromDbMock = vi.fn()
 const getConversationDetailFromDbMock = vi.fn()
 const listConversationSummariesMock = vi.fn()
 const getConversationDetailMock = vi.fn()
+const getSessionDetailFromDbMock = vi.fn()
+const getSessionMock = vi.fn()
+const getGroupChatServerMock = vi.fn()
 const loggerWarnMock = vi.fn()
 
 vi.mock('../../packages/server/src/db/hermes/conversations-db', () => ({
@@ -25,7 +28,7 @@ vi.mock('../../packages/server/src/services/logger', () => ({
 
 vi.mock('../../packages/server/src/services/hermes/hermes-cli', () => ({
   listSessions: vi.fn(),
-  getSession: vi.fn(),
+  getSession: getSessionMock,
   deleteSession: vi.fn(),
   renameSession: vi.fn(),
 }))
@@ -33,6 +36,7 @@ vi.mock('../../packages/server/src/services/hermes/hermes-cli', () => ({
 vi.mock('../../packages/server/src/db/hermes/sessions-db', () => ({
   listSessionSummaries: vi.fn(),
   searchSessionSummaries: vi.fn(),
+  getSessionDetailFromDb: getSessionDetailFromDbMock,
 }))
 
 vi.mock('../../packages/server/src/db/hermes/usage-store', () => ({
@@ -41,6 +45,10 @@ vi.mock('../../packages/server/src/db/hermes/usage-store', () => ({
   getUsageBatch: vi.fn(),
 }))
 
+vi.mock('../../packages/server/src/routes/hermes/group-chat', () => ({
+  getGroupChatServer: getGroupChatServerMock,
+}))
+
 vi.mock('../../packages/server/src/services/hermes/model-context', () => ({
   getModelContextLength: vi.fn(),
 }))
@@ -52,6 +60,10 @@ describe('session conversations controller', () => {
     getConversationDetailFromDbMock.mockReset()
     listConversationSummariesMock.mockReset()
     getConversationDetailMock.mockReset()
+    getSessionDetailFromDbMock.mockReset()
+    getSessionMock.mockReset()
+    getGroupChatServerMock.mockReset()
+    getGroupChatServerMock.mockReturnValue(null)
     loggerWarnMock.mockReset()
   })
 
@@ -104,4 +116,79 @@ describe('session conversations controller', () => {
     expect(getConversationDetailMock).toHaveBeenCalledWith('root', { source: undefined, humanOnly: false })
     expect(ctx.body).toEqual({ session_id: 'root', messages: [{ id: 1 }], visible_count: 1, thread_session_count: 1 })
   })
+
+  it('serves DB-backed session detail before falling back to CLI export', async () => {
+    getSessionDetailFromDbMock.mockResolvedValue({
+      id: 'compressed-root',
+      source: 'cli',
+      user_id: null,
+      model: 'gpt-5.5',
+      title: 'Compressed root',
+      started_at: 100,
+      ended_at: 120,
+      end_reason: 'compression',
+      message_count: 2,
+      tool_call_count: 0,
+      input_tokens: 10,
+      output_tokens: 20,
+      cache_read_tokens: 0,
+      cache_write_tokens: 0,
+      reasoning_tokens: 0,
+      billing_provider: null,
+      estimated_cost_usd: 0,
+      actual_cost_usd: null,
+      cost_status: '',
+      preview: 'hello',
+      last_active: 121,
+      messages: [
+        { id: 1, session_id: 'compressed-root', role: 'user', content: 'hello', tool_call_id: null, tool_calls: null, tool_name: null, timestamp: 101, token_count: null, finish_reason: null, reasoning: null },
+        { id: 2, session_id: 'compressed-root-cont', role: 'assistant', content: 'world', tool_call_id: null, tool_calls: null, tool_name: null, timestamp: 121, token_count: null, finish_reason: null, reasoning: null },
+      ],
+    })
+
+    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
+    const ctx: any = { params: { id: 'compressed-root' }, query: {}, body: null }
+    await mod.get(ctx)
+
+    expect(getSessionDetailFromDbMock).toHaveBeenCalledWith('compressed-root')
+    expect(getSessionMock).not.toHaveBeenCalled()
+    expect(ctx.body.session.messages.map((message: any) => message.content)).toEqual(['hello', 'world'])
+  })
+
+  it('falls back to CLI session detail when the DB detail path is unavailable', async () => {
+    getSessionDetailFromDbMock.mockRejectedValue(new Error('db unavailable'))
+    getSessionMock.mockResolvedValue({ id: 'legacy', messages: [{ id: 1, content: 'from cli' }] })
+
+    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
+    const ctx: any = { params: { id: 'legacy' }, query: {}, body: null }
+    await mod.get(ctx)
+
+    expect(loggerWarnMock).toHaveBeenCalled()
+    expect(getSessionMock).toHaveBeenCalledWith('legacy')
+    expect(ctx.body).toEqual({ session: { id: 'legacy', messages: [{ id: 1, content: 'from cli' }] } })
+  })
+
+  it('hides DB-backed session detail when a continuation child is pending deletion', async () => {
+    getGroupChatServerMock.mockReturnValue({
+      getStorage: () => ({
+        getPendingDeletedSessionIds: () => new Set(['compressed-root-cont']),
+      }),
+    })
+    getSessionDetailFromDbMock.mockResolvedValue({
+      id: 'compressed-root',
+      messages: [
+        { id: 1, session_id: 'compressed-root', role: 'user', content: 'hello', timestamp: 101 },
+        { id: 2, session_id: 'compressed-root-cont', role: 'assistant', content: 'hidden', timestamp: 121 },
+      ],
+    })
+
+    const mod = await import('../../packages/server/src/controllers/hermes/sessions')
+    const ctx: any = { params: { id: 'compressed-root' }, query: {}, body: null }
+    await mod.get(ctx)
+
+    expect(getSessionDetailFromDbMock).toHaveBeenCalledWith('compressed-root')
+    expect(getSessionMock).not.toHaveBeenCalled()
+    expect(ctx.status).toBe(404)
+    expect(ctx.body).toEqual({ error: 'Session not found' })
+  })
 })