---
created: 2026-04-06
type: log
project: "[[Smart Support]]"
source: docs/phases/phase-4-dev-log.md
tags:
  - dev-log
  - phase-4
  - analytics
  - replay
  - postgresql
---

# Phase 4: Conversation Replay + Analytics -- Development Log

> Status: COMPLETED
> Phase branch: `phase-4/analytics-replay`
> Date started: 2026-03-31
> Date completed: 2026-03-31

## What Was Built

- **回放模型**: StepType 枚举、ReplayStep、ReplayPage 冻结数据类。
- **检查点转换器** (`replay/transformer.py`): PostgresSaver JSONB -> 结构化 ReplayStep 时间线。
- **回放 API** (`replay/api.py`): GET /api/conversations（分页列表）、GET /api/replay/{thread_id}（分页时间线，默认 20 步）。
- **分析模型**: AgentUsage、InterruptStats、AnalyticsResult。
- **事件记录器** (`analytics/event_recorder.py`): AnalyticsRecorder Protocol + PostgresAnalyticsRecorder + NoOpAnalyticsRecorder。
- **分析查询** (`analytics/queries.py`): resolution_rate, agent_usage, escalation_rate, cost_per_conversation, interrupt_stats。
- **分析 API** (`analytics/api.py`): GET /api/analytics?range=Xd。
- **DB 迁移**: analytics_events 表 + conversations 列扩展（resolution_type, agents_used, turn_count, ended_at）。

## Test Coverage

- New: 74 tests
- Total: 399 tests
- Coverage: 92.87%

## Related

- [[Smart Support]]
- [[Smart Support/Phase 4 - 分析 + 回放]]