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2 - Projects/Smart Support/Phase 4 Dev Log.md

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+---
+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]]