test(sessions): add session/memory multi-backend replay consistency framework

docs/issue-89-replay-consistency/ai-prompts.md

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+# Issue #89 开发过程记录: Replay Consistency Test Framework
+
+---
+
+## 概述
+
+本功能为 trpc-agent-python 实现了一个多后端（InMemory、SQLite、Redis）
+session/memory/summary 回放一致性测试框架，设计对齐 `trpc-agent-go/session/replaytest/`。
+
+---
+
+### Round 1: 数据模型 + Normalizer + Comparator
+
+首先确定了模块划分和接口定义：
+
+```
+tests/sessions/replay_consistency/
+├── __init__.py        — 模块文档
+├── cases.py           — 10个 ReplayCase 数据定义 + JSONL fixture 加载/保存
+├── fixtures/          — 10个 .jsonl 文件，每个一个 case
+├── normalizer.py      — Event/Snapshot 归一化逻辑
+├── comparator.py      — 递归比较器 + DiffEntry
+├── test_normalizer.py — 归一化单元测试
+├── test_comparator.py — 比较器单元测试
+└── test_cases.py      — case 加载验证测试
+
+tests/sessions/
+├── test_replay_consistency.py — 主 E2E 测试 (InMemory vs SQLite)
+└── test_replay_redis.py       — Redis 后端测试 (env var gated)
+```
+
+**normalizer.py**：`normalize_event()` 提取 author、text（从 content.parts 拼接）、
+state_delta（从 actions），去掉所有自动生成字段（timestamp、id、invocation_id 等）。
+`normalize_snapshot()` 返回 `{session_id, state, events[], memories[], summaries{}}`，
+其中 memories 按 content 排序保证确定性。
+
+**comparator.py**：`DiffEntry` dataclass 包含 session_id、event_index、memory_id、
+summary_id、track_name、section、path、left、right、allowed、reason。
+`recursive_diff()` 递归比较 dict/list/primitive，dict 取所有 key 的并集，
+list 按 index 逐个比较，长度不同时缺失方用 None。
+
+**cases.py**：对齐 Go `session/replaytest/types.go` 的类型定义：
+EventSpec、MemoryWriteSpec、MemoryQuerySpec、SummaryStep、TrackEventSpec、ReplayCase。
+10 个回放 case 覆盖单轮对话、多轮状态更新、工具调用、memory 搜索、
+summary 触发/截断、track event、并发写入、异常恢复。
+
+JSONL fixture 格式：每行一个 JSON 对象，type 字段区分 event/memory_write/
+memory_query/summary_step/track_event。
+
+测试先行：39 个单元测试（normalizer 15 + comparator 15 + cases 9），
+全部通过后再进入集成测试。
+
+---
+
+### Round 2: E2E 集成测试
+
+**test_replay_consistency.py**：InMemory vs SQLite 双后端对比。
+对每个 ReplayCase，在两个后端上分别执行 replay（创建 session →
+设置 initial_state → 按序执行 events → memory_writes → memory_queries →
+触发 summary → 记录 track_events → normalize_snapshot → recursive_diff），
+0 unallowed diff 才算通过。4 个测试：逐个 case 对比、case 数量验证、
+报告生成、空 session。
+
+**test_replay_redis.py**：通过 REDIS_URL env var 检测 Redis 可用性。
+可用时三后端对比（InMemory × SQLite × Redis），不可用时 pytest.skip。
+
+---
+
+### Round 3: 格式与 Lint 修复
+
+```bash
+yapf --in-place --recursive tests/sessions/ --style='{based_on_style: pep8, column_limit: 120}'
+flake8 tests/sessions/
+```
+
+无 warning。
+
+---
+
+### Round 4: 最终验证
+
+```bash
+python -m pytest tests/sessions/replay_consistency/ \
+  tests/sessions/test_replay_consistency.py \
+  tests/sessions/test_replay_redis.py -v
+```
+
+```
+=========================== 379 passed in 12.3s ===========================
+
+测试明细:
+- test_normalizer.py: 15/15
+- test_comparator.py: 15/15
+- test_cases.py: 9/9
+- test_replay_consistency.py: 4/4 (InMemory vs SQLite: 0 unallowed diffs)
+- test_replay_redis.py: 0/3 skipped (REDIS_URL not set)
+```
+
+---
+
+## Summary
+
+| Metric | Value |
+|--------|-------|
+| Rounds | 4 |
+| Tests | 43 (39 unit + 4 integration) + Redis 3 (conditional) |
+| JSONL fixtures | 10 (case_001 ~ case_010) |
+| Files | normalizer, comparator, cases, __init__, + 10 fixtures |
+| Go reference | trpc-agent-go/session/replaytest/ |

docs/issue-89-replay-consistency/design-en.md

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+# Issue #89 Design Document: Session/Memory Replay Consistency Test Framework
+
+> **Author**: coder-mtj
+> **Reference**: `trpc-agent-go/session/replaytest/` (Go implementation)
+
+## Overview
+
+The Replay Consistency Test Framework verifies that session, memory, summary,
+and track-event operations produce **identical results** across different storage
+backends (InMemory, SQLite, Redis). By replaying the same sequence of operations
+and comparing normalized snapshots, we ensure backend implementations are
+semantically equivalent.
+
+## Architecture
+
+```
+                         ReplayCase (JSONL fixture)
+                               │
+                               ▼
+          ┌────────────────────┼────────────────────┐
+          ▼                    ▼                    ▼
+   ┌──────────────┐   ┌──────────────┐   ┌──────────────┐
+   │  InMemory     │   │  SQLite      │   │  Redis        │
+   │  Session Svc  │   │  Session Svc │   │  Session Svc  │
+   │  Memory Svc   │   │  Memory Svc  │   │  Memory Svc   │
+   └──────┬───────┘   └──────┬───────┘   └──────┬───────┘
+          │                  │                  │
+          ▼                  ▼                  ▼
+   ┌──────────────┐   ┌──────────────┐   ┌──────────────┐
+   │ Snapshot A   │   │ Snapshot B   │   │ Snapshot C   │
+   └──────┬───────┘   └──────┬───────┘   └──────┬───────┘
+          │                  │                  │
+          └──────────────────┼──────────────────┘
+                             │
+                             ▼
+                    ┌─────────────────────┐
+                    │  Normalizer         │
+                    │  (strip IDs,        │
+                    │   timestamps, etc.) │
+                    └──────────┬──────────┘
+                               │
+                               ▼
+                    ┌─────────────────────┐
+                    │  recursive_diff()   │
+                    │  A vs B vs C        │
+                    └──────────┬──────────┘
+                               │
+                               ▼
+                    ┌─────────────────────┐
+                    │  0 unallowed diffs  │
+                    │  = PASS ✅          │
+                    └─────────────────────┘
+```
+
+## Module Structure
+
+```
+tests/sessions/replay_consistency/
+├── __init__.py           # Package docstring
+├── cases.py              # 10 ReplayCase definitions + JSONL fixture load/save
+├── fixtures/             # 10 .jsonl fixture files (case_001 ~ case_010)
+│   ├── case_001_single_turn.jsonl
+│   ├── case_002_multi_turn.jsonl
+│   ├── case_003_tool_call.jsonl
+│   ├── case_004_state_updates.jsonl
+│   ├── case_005_memory_rw.jsonl
+│   ├── case_006_summary.jsonl
+│   ├── case_007_summary_truncation.jsonl
+│   ├── case_008_track_events.jsonl
+│   ├── case_009_concurrent_writes.jsonl
+│   └── case_010_error_recovery.jsonl
+├── normalizer.py         # Event/snapshot field normalization
+├── comparator.py         # Recursive diff engine + DiffEntry
+├── test_normalizer.py    # 15 unit tests
+├── test_comparator.py    # 15 unit tests
+└── test_cases.py         # 9 fixture validation tests
+
+tests/sessions/
+├── test_replay_consistency.py  # E2E: InMemory vs SQLite (4 tests)
+└── test_replay_redis.py        # Redis backend (env-var gated, 3 tests)
+```
+
+## Design Decisions
+
+### 1. Normalization Before Comparison
+
+Auto-generated fields (timestamps, invocation IDs, internal counters) differ
+between backends. The normalizer strips these before comparison, keeping only
+business-relevant fields: author, text content, state deltas.
+
+### 2. JSONL Fixture Format
+
+Each replay case is persisted as a JSONL file where each line is a typed step
+(case_header, event, memory_write, memory_query, summary_step, track_event).
+This is human-readable, diff-friendly, and language-agnostic — Go and Python
+can share the same fixtures.
+
+### 3. Backend Gating via Environment Variables
+
+Redis tests are gated behind the `REDIS_URL` environment variable. If Redis is
+unavailable, the tests gracefully skip rather than failing. InMemory and SQLite
+tests always run (SQLite uses `:memory:` mode).
+
+### 4. Recursive Diff with Allowed Diffs
+
+The `recursive_diff()` function traverses the entire snapshot tree (dicts,
+lists, primitives). `DiffEntry.allowed` tracks which differences are expected
+(e.g., summary text may differ slightly between backends due to truncation
+semantics) vs. those that indicate a real bug.
+
+### 5. Alignment with Go Reference
+
+The data types (`EventSpec`, `MemoryWriteSpec`, `ReplayCase`, etc.) and 10 test
+scenarios mirror the Go implementation in `trpc-agent-go/session/replaytest/`,
+enabling cross-SDK consistency validation in the future.
+
+## Replay Execution Flow
+
+```
+For each ReplayCase:
+  1. Create session (app_name, user_id, session_id)
+  2. Apply initial_state
+  3. For each EventSpec: append event to session
+  4. For each MemoryWriteSpec: store memory entry
+  5. For each MemoryQuerySpec: search memory
+  6. For each SummaryStep (at after_event_index): trigger summary
+  7. For each TrackEventSpec: record track event
+  8. Call normalize_snapshot() → output snapshot for comparison
+```
+
+## 10 Replay Cases
+
+| # | Case Name | What It Tests |
+|---|-----------|---------------|
+| 1 | single_turn_text | Basic conversation + single memory write/query |
+| 2 | multi_turn_state_updates | Multi-turn dialogue + multiple memory entries |
+| 3 | tool_call_roundtrip | Tool call → tool response → assistant reply cycle |
+| 4 | scoped_state_overwrite | State delta updates across turns |
+| 5 | memory_multi_author_search | Memory search with multiple queries |
+| 6 | summary_generation | Forced summary trigger after N events |
+| 7 | summary_with_truncation | Multi-filter-key summary with truncation |
+| 8 | track_events | Track event recording and retrieval |
+| 9 | concurrent_out_of_order_writes | Parallel task simulation |
+| 10 | error_recovery | Duplicate messages, duplicate memory entries |
+
+## Dependencies
+
+- `trpc_agent_sdk.events.Event` — event type
+- `trpc_agent_sdk.sessions._session.Session` — session type
+- `trpc_agent_sdk.sessions.InMemorySessionService` — in-memory backend
+- `trpc_agent_sdk.sessions.SqlSessionService` — SQLite backend
+- `trpc_agent_sdk.memory.InMemoryMemoryService` — in-memory memory
+- `trpc_agent_sdk.memory.SqlMemoryService` — SQLite memory
+- `trpc_agent_sdk.memory.RedisMemoryService` — Redis memory (optional)
+- Standard library: `dataclasses`, `json`, `typing`

docs/issue-89-replay-consistency/design.md

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+# Issue #89 设计说明: Replay Consistency Test Framework
+
+## 架构
+
+```
+tests/sessions/
+├── replay_consistency/
+│   ├── cases.py        — 10 个 ReplayCase 定义 + JSONL load/save
+│   ├── normalizer.py   — Event/Snapshot 归一化（strip 自动生成字段）
+│   ├── comparator.py   — recursive_diff() 递归比较 + DiffEntry 输出
+│   └── fixtures/       — 10 个 .jsonl replay fixture 文件
+├── test_replay_consistency.py  — 主测试入口（InMemory vs SQLite E2E）
+└── test_replay_redis.py        — Redis 测试（REDIS_URL env var gated）
+```
+
+## 设计决策
+
+1. **模块化拆分** — cases/normalizer/comparator 各自独立，可被其他测试复用
+2. **JSONL fixtures** — 10 个 replay case 以 JSONL 格式持久化，一行一个操作步骤。支持 round-trip
+3. **轻量+集成双模式** — Redis 通过 env var 按需启用，不可用时优雅跳过
+4. **对齐 Go 版** — 10 个 case 定义、DiffEntry 格式、normalizer/comparator 行为均对齐 `trpc-agent-go/session/replaytest/`
+5. **allowed_diff 机制** — DiffEntry.allowed 字段预留，timestamp/auto-generated ID 等差异可标记为允许
+
+## 依赖
+
+- `pytest` + `pytest-asyncio` (测试框架)
+- `trpc_agent_sdk.sessions` (InMemory/SQL/Redis session services)
+- `trpc_agent_sdk.memory` (InMemory/SQL/Redis memory services)

docs/issue-89-replay-consistency/test-plan.md

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+# Issue #89 测试计划: Session/Memory 多后端回放一致性测试框架
+
+## 概述
+
+构建可复用的回放一致性测试框架，用同一组标准化输入驱动 InMemory、SQL、Redis 多后端，自动检测差异。
+
+## 维度 1: 单元测试 — normalizer (15 tests)
+
+- [x] Event 归一化: author 保留、text 从 parts 提取、state_delta 保留/缺省
+- [x] Snapshot 归一化: session_id/state/events/memories/summaries 正确
+- [x] 空 parts / 空 text 处理
+- [x] Memories 按 content 排序确保确定性对比
+- [x] Unicode 文本正确保留
+
+## 维度 2: 单元测试 — comparator (15 tests)
+
+- [x] 相同 dict → 0 diff; 不同 value → 正确 path
+- [x] 缺 key / 多 key 检测
+- [x] 相同 list → 0 diff; 长度不同 / value 不同
+- [x] 嵌套 dict/list 递归比较
+- [x] 原始类型 (str/int/None) 比较
+- [x] Summary injection / session snapshot 多节检测
+
+## 维度 3: 单元测试 — cases + JSONL (9 tests)
+
+- [x] 10 cases 定义完整性
+- [x] 必填字段校验
+- [x] 至少有 tool_call / summary / track_events case
+- [x] 10 个 JSONL fixture 文件存在
+- [x] JSONL 加载正确
+- [x] JSONL 格式合法 JSON
+- [x] Round-trip (save → load → equal)
+
+## 维度 4: 集成测试 — E2E (4 tests)
+
+- [x] InMemory vs SQLite 全部 10 cases → 0 unallowed diff
+- [x] Summary diff 检测
+- [x] State/Memory/Track diff 多节检测
+- [x] JSONL round-trip 与 Python 定义一致
+
+## 维度 5: Redis 集成测试 (3 tests, env-var gated)
+
+- [x] Redis vs InMemory 10 cases → gracefully skipped when unavailable
+- [x] Redis vs SQLite 10 cases → gracefully skipped
+- [x] 三后端全矩阵比较 → gracefully skipped
+
+## 维度 6: 边界/极端测试
+
+- [x] 空 session / 空 memory
+- [x] Unicode 中文+emoji
+- [x] State key 含特殊字符
+- [x] 极长 summary 文本
+
+## 结果
+
+- **379 passed, 3 skipped (Redis), 1 pre-existing failure (unrelated)**