fix: align usage analytics with Hermes state db (#350)

tests/server/sessions-routes.test.ts

@@ -2,6 +2,7 @@ import { beforeEach, describe, expect, it, vi } from 'vitest'
 
 const listConversationsMock = vi.fn(async (ctx: any) => { ctx.body = { sessions: [{ id: 'conversation-1' }] } })
 const getConversationMessagesMock = vi.fn(async (ctx: any) => { ctx.body = { session_id: ctx.params.id, messages: [] } })
+const getConversationMessagesPaginatedMock = vi.fn(async (ctx: any) => { ctx.body = { session_id: ctx.params.id, messages: [], pagination: {} } })
 const listMock = vi.fn(async (ctx: any) => { ctx.body = { sessions: [{ id: 's1' }] } })
 const searchMock = vi.fn(async (ctx: any) => { ctx.body = { results: [{ id: 'search-1' }] } })
 const getMock = vi.fn(async (ctx: any) => { ctx.body = { session: { id: ctx.params.id } } })
@@ -15,6 +16,7 @@ const contextLengthMock = vi.fn(async (ctx: any) => { ctx.body = { context_lengt
 vi.mock('../../packages/server/src/controllers/hermes/sessions', () => ({
   listConversations: listConversationsMock,
   getConversationMessages: getConversationMessagesMock,
+  getConversationMessagesPaginated: getConversationMessagesPaginatedMock,
   list: listMock,
   search: searchMock,
   get: getMock,
@@ -31,6 +33,7 @@ describe('session routes', () => {
     vi.resetModules()
     listConversationsMock.mockClear()
     getConversationMessagesMock.mockClear()
+    getConversationMessagesPaginatedMock.mockClear()
     listMock.mockClear()
     searchMock.mockClear()
     getMock.mockClear()
@@ -45,10 +48,12 @@ describe('session routes', () => {
     expect(paths).toEqual(expect.arrayContaining([
       '/api/hermes/sessions/conversations',
       '/api/hermes/sessions/conversations/:id/messages',
+      '/api/hermes/sessions/conversations/:id/messages/paginated',
       '/api/hermes/sessions',
       '/api/hermes/search/sessions',
       '/api/hermes/sessions/search',
       '/api/hermes/sessions/usage',
+      '/api/hermes/usage/stats',
       '/api/hermes/sessions/context-length',
       '/api/hermes/sessions/:id',
       '/api/hermes/sessions/:id/usage',