diff --git a/cmd/homed/main.go b/cmd/homed/main.go
index 8049cb1..11e9b41 100644
--- a/cmd/homed/main.go
+++ b/cmd/homed/main.go
@@ -3,6 +3,8 @@ package main
 import (
 	"context"
 	"flag"
+	"fmt"
+	"io"
 	"log"
 	"os"
 	"os/signal"
@@ -45,6 +47,22 @@ func main() {
 	}
 
 	log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
+
+	// 文件日志：同时输出到控制台和 data/log/ 目录
+	logDir := filepath.Join(*dataDir, "log")
+	if err := os.MkdirAll(logDir, 0755); err != nil {
+		log.Printf("[homed] warning: cannot create log dir: %v", err)
+	} else {
+		logPath := filepath.Join(logDir, fmt.Sprintf("homed_%s.log", time.Now().Format("2006-01-02_15-04-05")))
+		logFile, err := os.OpenFile(logPath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
+		if err != nil {
+			log.Printf("[homed] warning: cannot open log file: %v", err)
+		} else {
+			log.SetOutput(io.MultiWriter(os.Stderr, logFile))
+			log.Printf("[homed] logging to %s", logPath)
+		}
+	}
+
 	log.Printf("[homed] starting HomeAgent v0.1.0 (pure kernel)")
 
 	agentWorkDir := filepath.Join(*dataDir, "agentfs")
diff --git a/internal/agent/core/agent.go b/internal/agent/core/agent.go
index 0b1f04c..d1a992d 100644
--- a/internal/agent/core/agent.go
+++ b/internal/agent/core/agent.go
@@ -1651,6 +1651,65 @@ func (a *Agent) reorgGraph() {
 	} else {
 		log.Printf("[agent] graph reorg: no similar entities found")
 	}
+
+	// 5. 图连接质量评估：由 LLM 判断低质量关系并丢弃
+	a.evaluateGraphQuality()
+}
+
+func (a *Agent) evaluateGraphQuality() {
+	if a.memory == nil {
+		return
+	}
+
+	// 召回近期低 confidence 关系（使用默认 recall 获取最新实体和关系）
+	result, err := a.memory.Recall(nil, nil, 1, "")
+	if err != nil || result == nil || len(result.Relations) == 0 {
+		return
+	}
+
+	// 选出低质量候选：generic 关系（如 distiller 自动生成的泛化关系）
+	var lowQuality []string
+	for _, r := range result.Relations {
+		// 自动蒸馏生成的 (用户, 提及, ...) 和 (AI, 回应, ...) 通常是噪音
+		if (r.SourceName == "用户" || r.SourceName == "AI") &&
+			(r.RelationType == "提及" || r.RelationType == "回应") {
+			lowQuality = append(lowQuality, fmt.Sprintf("「%s」-「%s」→「%s」", r.SourceName, r.RelationType, r.TargetName))
+			continue
+		}
+		// 极低 mention 的实体+generic 关系
+		if r.Confidence < 0.3 && r.RelationType != "" {
+			lowQuality = append(lowQuality, fmt.Sprintf("「%s」-「%s」→「%s」(confidence=%.1f)", r.SourceName, r.RelationType, r.TargetName, r.Confidence))
+		}
+	}
+
+	if len(lowQuality) == 0 {
+		return
+	}
+
+	// 分批发送给 LLM 决策，每批最多 10 条
+	batchSize := 10
+	for i := 0; i < len(lowQuality); i += batchSize {
+		end := i + batchSize
+		if end > len(lowQuality) {
+			end = len(lowQuality)
+		}
+		batch := lowQuality[i:end]
+
+		a.enqueueConsolidationTask(ConsolidationTask{
+			Type: "graph_quality",
+			Reason: fmt.Sprintf(
+				"图数据库中发现 %d 条低质量关系，请逐条判断是否应该删除（保留 = keep，删除 = discard）：\n%s",
+				len(batch),
+				strings.Join(batch, "\n"),
+			),
+			Data: map[string]interface{}{
+				"candidates": batch,
+				"action":     "evaluate_quality",
+			},
+		})
+	}
+
+	log.Printf("[agent] graph quality: %d low-quality connection batches sent for LLM evaluation", (len(lowQuality)+batchSize-1)/batchSize)
 }
 
 // entitySimilarity 计算两个实体名的相似度（字符 bigram Jaccard）
diff --git a/internal/memory/indexer_test.go b/internal/memory/indexer_test.go
new file mode 100644
index 0000000..3b6d845
--- /dev/null
+++ b/internal/memory/indexer_test.go
@@ -0,0 +1,246 @@
+package memory
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestNewIndexer(t *testing.T) {
+	idx := NewIndexer(nil)
+	if idx == nil {
+		t.Fatal("expected non-nil indexer")
+	}
+}
+
+func TestIndexerSyncWithNilDB(t *testing.T) {
+	idx := NewIndexer(nil)
+	if err := idx.Sync(); err != nil {
+		t.Errorf("expected no error with nil db, got %v", err)
+	}
+}
+
+func TestIndexerSync(t *testing.T) {
+	db, err := NewGraphDB(filepath.Join(t.TempDir(), "test.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	// 写入一些实体
+	ec, _, err := db.Commit([]Triple{
+		{Subject: "张三", Relation: "喜欢", Object: "篮球"},
+		{Subject: "李四", Relation: "喜欢", Object: "足球"},
+	}, "test", 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	idx := NewIndexer(db)
+	if err := idx.Sync(); err != nil {
+		t.Fatal(err)
+	}
+
+	if !idx.trained {
+		t.Error("expected indexer to be trained after sync")
+	}
+	if idx.vec.Size() != ec {
+		t.Errorf("expected %d vectors, got %d", ec, idx.vec.Size())
+	}
+}
+
+func TestIndexerBuildContext(t *testing.T) {
+	db, err := NewGraphDB(filepath.Join(t.TempDir(), "test.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	db.Commit([]Triple{
+		{Subject: "张三", Relation: "喜欢", Object: "篮球"},
+		{Subject: "张三", Relation: "职业", Object: "程序员"},
+	}, "test", 0)
+
+	idx := NewIndexer(db)
+	idx.Sync()
+
+	ctx := idx.BuildContext("张三")
+	if ctx == nil {
+		t.Fatal("expected non-nil context")
+	}
+	if len(ctx.Entities) == 0 {
+		t.Error("expected at least one entity in context")
+	}
+}
+
+func TestIndexerBuildContextEmpty(t *testing.T) {
+	idx := NewIndexer(nil)
+	ctx := idx.BuildContext("anything")
+	if ctx == nil {
+		t.Fatal("expected non-nil context even with nil db")
+	}
+	if ctx.Summary != "" {
+		t.Errorf("expected empty summary with nil db, got %q", ctx.Summary)
+	}
+}
+
+func TestIndexerMarkRecalled(t *testing.T) {
+	idx := NewIndexer(nil)
+	idx.MarkRecalled("张三", "李四")
+
+	idx.mu.RLock()
+	_, ok1 := idx.recalled["张三"]
+	_, ok2 := idx.recalled["李四"]
+	_, ok3 := idx.recalled["王五"]
+	idx.mu.RUnlock()
+
+	if !ok1 {
+		t.Error("expected '张三' to be marked recalled")
+	}
+	if !ok2 {
+		t.Error("expected '李四' to be marked recalled")
+	}
+	if ok3 {
+		t.Error("expected '王五' NOT to be marked recalled")
+	}
+}
+
+func TestIndexerFilterRecalled(t *testing.T) {
+	db, err := NewGraphDB(filepath.Join(t.TempDir(), "test.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	db.Commit([]Triple{
+		{Subject: "张三", Relation: "喜欢", Object: "篮球"},
+		{Subject: "李四", Relation: "喜欢", Object: "足球"},
+	}, "test", 0)
+
+	idx := NewIndexer(db)
+	idx.Sync()
+	idx.MarkRecalled("张三")
+
+	ctx := idx.BuildContext("张三")
+	if ctx == nil {
+		t.Fatal("expected non-nil context")
+	}
+	for _, e := range ctx.Entities {
+		if e.Name == "张三" {
+			t.Error("expected '张三' to be filtered out (marked recalled)")
+		}
+	}
+}
+
+func TestFormatContext(t *testing.T) {
+	idx := NewIndexer(nil)
+
+	result := idx.FormatContext(nil)
+	if result != "" {
+		t.Errorf("expected empty string for nil context, got %q", result)
+	}
+
+	ctx := &InjectedContext{
+		Entities: []Entity{
+			{ID: 1, Name: "张三", Type: "Person"},
+			{ID: 2, Name: "篮球", Type: "Concept"},
+		},
+		Summary: "关联 2 个记忆实体，高频：张三、篮球",
+	}
+	result = idx.FormatContext(ctx)
+	if result == "" {
+		t.Error("expected non-empty formatted context")
+	}
+	if !contains(result, "张三") || !contains(result, "篮球") {
+		t.Errorf("expected context to contain entity names, got %q", result)
+	}
+}
+
+func TestBuildIndexSummary(t *testing.T) {
+	entities := []Entity{
+		{Name: "张三", Type: "Person", MentionCount: 10},
+		{Name: "李四", Type: "Person", MentionCount: 5},
+		{Name: "篮球", Type: "Concept", MentionCount: 3},
+		{Name: "北京", Type: "Location", MentionCount: 2},
+	}
+	s := buildIndexSummary(entities)
+	if !contains(s, "张三") || !contains(s, "李四") {
+		t.Errorf("expected summary to contain top entities, got %q", s)
+	}
+}
+
+func TestBuildIndexSummaryEmpty(t *testing.T) {
+	s := buildIndexSummary(nil)
+	if s != "" {
+		t.Errorf("expected empty summary for nil, got %q", s)
+	}
+}
+
+func TestExtractKeywords(t *testing.T) {
+	tests := []struct {
+		input string
+		min   int
+	}{
+		{"今天天气怎么样", 1},
+		{"张三的朋友李四", 1},
+		{"hello world", 1},
+		{"的了的", 0}, // all stop words
+	}
+	for _, tt := range tests {
+		kw := extractKeywords(tt.input)
+		if len(kw) < tt.min {
+			t.Errorf("extractKeywords(%q) = %v, want at least %d keywords", tt.input, kw, tt.min)
+		}
+	}
+}
+
+func TestGetToolDefinitions(t *testing.T) {
+	idx := NewIndexer(nil)
+	defs := idx.GetToolDefinitions()
+	if len(defs) < 3 {
+		t.Errorf("expected at least 3 tool defs, got %d", len(defs))
+	}
+}
+
+func TestBuildToolPrompt(t *testing.T) {
+	idx := NewIndexer(nil)
+	prompt := idx.BuildToolPrompt()
+	if !contains(prompt, "memory_recall") {
+		t.Errorf("expected prompt to mention memory_recall, got %q", prompt)
+	}
+}
+
+func TestVectorSearchEntities(t *testing.T) {
+	db, err := NewGraphDB(filepath.Join(t.TempDir(), "test.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	db.Commit([]Triple{
+		{Subject: "张三", Relation: "喜欢", Object: "篮球"},
+	}, "test", 0)
+
+	idx := NewIndexer(db)
+	idx.Sync()
+
+	// After sync, we have entities. Vector search should find relevant ones.
+	entities := idx.vectorSearchEntities("张三")
+	if len(entities) == 0 {
+		// This might be empty due to TF-IDF matching — vector search on single
+		// entity names is approximate. Just check it doesn't crash.
+		t.Log("vector search returned 0 results (acceptable for short queries)")
+	}
+}
+
+func contains(s, substr string) bool {
+	return len(s) >= len(substr) && (s == substr || len(s) > 0 && containsStr(s, substr))
+}
+
+func containsStr(s, substr string) bool {
+	for i := 0; i <= len(s)-len(substr); i++ {
+		if s[i:i+len(substr)] == substr {
+			return true
+		}
+	}
+	return false
+}
diff --git a/internal/memory/pipeline/pipeline_test.go b/internal/memory/pipeline/pipeline_test.go
new file mode 100644
index 0000000..6a0a48c
--- /dev/null
+++ b/internal/memory/pipeline/pipeline_test.go
@@ -0,0 +1,290 @@
+package pipeline
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"gitcode.com/JianFeeeee/HomeAgent/internal/memory"
+)
+
+func TestNewDistiller(t *testing.T) {
+	d := NewDistiller(nil, t.TempDir(), DistillerConfig{
+		Interval:      10 * time.Minute,
+		RetentionDays: 7,
+		BatchSize:     50,
+	})
+	if d == nil {
+		t.Fatal("expected non-nil distiller")
+	}
+	if d.cfg.Interval != 10*time.Minute {
+		t.Errorf("expected interval 10m, got %v", d.cfg.Interval)
+	}
+}
+
+func TestAppendAndFlush(t *testing.T) {
+	dir := t.TempDir()
+	d := NewDistiller(nil, dir, DistillerConfig{
+		Interval:      10 * time.Minute,
+		RetentionDays: 7,
+		BatchSize:     50,
+	})
+	// flush 需要 rawPath 目录已存在（Start() 负责创建）
+	os.MkdirAll(d.rawPath, 0755)
+
+	d.Append("sess1", "user", "今天天气怎么样？")
+	d.Append("sess1", "assistant", "今天天气很好，适合出行。")
+
+	if len(d.records) != 2 {
+		t.Fatalf("expected 2 records, got %d", len(d.records))
+	}
+
+	d.flush()
+
+	// 验证 JSONL 已写入
+	entries, err := os.ReadDir(d.rawPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(entries) == 0 {
+		t.Fatal("expected flushed files")
+	}
+}
+
+func TestLoadExisting(t *testing.T) {
+	dir := t.TempDir()
+
+	// 先写一个文件再创建 Distiller 验证 load
+	d1 := NewDistiller(nil, dir, DistillerConfig{
+		Interval:      10 * time.Minute,
+		RetentionDays: 7,
+		BatchSize:     50,
+	})
+	os.MkdirAll(d1.rawPath, 0755)
+	d1.Append("sess1", "user", "test content")
+	d1.flush()
+
+	d2 := NewDistiller(nil, dir, DistillerConfig{
+		Interval:      10 * time.Minute,
+		RetentionDays: 7,
+		BatchSize:     50,
+	})
+	d2.loadExisting()
+
+	if len(d2.records) != 1 {
+		t.Fatalf("expected 1 record after load, got %d", len(d2.records))
+	}
+}
+
+func TestDistillOnce(t *testing.T) {
+	db, err := memory.NewGraphDB(filepath.Join(t.TempDir(), "test.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	dir := t.TempDir()
+	d := NewDistiller(db, dir, DistillerConfig{
+		Interval:      10 * time.Minute,
+		RetentionDays: 7,
+		BatchSize:     50,
+	})
+	// 写入一条旧记录（超过保留期）
+	past := time.Now().Add(-8 * 24 * time.Hour)
+	d.records = append(d.records, RawRecord{
+		ID: 1, SessionID: "sess1", Role: "user",
+		Content: "我的名字是张三", CreatedAt: past, Distilled: false,
+	})
+	d.records = append(d.records, RawRecord{
+		ID: 2, SessionID: "sess1", Role: "assistant",
+		Content: "你好张三！", CreatedAt: past, Distilled: false,
+	})
+
+	d.distillOnce()
+
+	// 验证蒸馏后已有记录被标记（distillOnce 从 records 中移除已蒸馏记录，检查剩余数量）
+	if len(d.records) != 0 {
+		t.Logf("records after distill: %d (all should have been removed)", len(d.records))
+	}
+}
+
+func TestExtractKeyTriples(t *testing.T) {
+	tests := []struct {
+		user     string
+		assistant string
+		want     int // expected number of triples
+		check    func([]memory.Triple) bool
+	}{
+		{
+			user: "我叫张三",
+			want: 1,
+			check: func(triples []memory.Triple) bool {
+				for _, tr := range triples {
+					if tr.Subject == "用户" && tr.Relation == "姓名" && tr.Object == "张三" {
+						return true
+					}
+				}
+				return false
+			},
+		},
+		{
+			user: "我住在北京",
+			want: 1,
+			check: func(triples []memory.Triple) bool {
+				for _, tr := range triples {
+					if tr.Subject == "用户" && tr.Relation == "居住地" && tr.Object == "北京" {
+						return true
+					}
+				}
+				return false
+			},
+		},
+		{
+			user: "我喜欢打篮球",
+			want: 1,
+			check: func(triples []memory.Triple) bool {
+				for _, tr := range triples {
+					if tr.Subject == "用户" && tr.Relation == "喜好" && tr.Object == "打篮球" {
+						return true
+					}
+				}
+				return false
+			},
+		},
+		{
+			user: "我28岁",
+			want: 1,
+			check: func(triples []memory.Triple) bool {
+				for _, tr := range triples {
+					if tr.Subject == "用户" && tr.Relation == "年龄" && tr.Object == "28" {
+						return true
+					}
+				}
+				return false
+			},
+		},
+		{
+			user: "我的工作是程序员",
+			want: 1,
+			check: func(triples []memory.Triple) bool {
+				for _, tr := range triples {
+					if tr.Subject == "用户" && tr.Relation == "职业" && tr.Object == "程序员" {
+						return true
+					}
+				}
+				return false
+			},
+		},
+		{
+			user: "今天天气真好",
+			want: 0, // 没有匹配任何规则
+			check: func(triples []memory.Triple) bool {
+				return true // any result is fine
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		triples := extractKeyTriples(tt.user, tt.assistant)
+		if len(triples) != tt.want {
+			t.Errorf("extractKeyTriples(%q) = %d triples, want %d", tt.user, len(triples), tt.want)
+		}
+		if tt.check != nil && !tt.check(triples) {
+			t.Errorf("extractKeyTriples(%q) = %v, check failed", tt.user, triples)
+		}
+	}
+}
+
+func TestExtractName(t *testing.T) {
+	tests := []struct{ input, want string }{
+		{"我叫张三", "张三"},
+		{"我的名字是李四", "李四"},
+		{"今天天气好", ""},
+	}
+	for _, tt := range tests {
+		got := extractName(tt.input)
+		if got != tt.want {
+			t.Errorf("extractName(%q) = %q, want %q", tt.input, got, tt.want)
+		}
+	}
+}
+
+func TestExtractLocation(t *testing.T) {
+	tests := []struct{ input, want string }{
+		{"我住在北京", "北京"},
+		{"我家在上海", "上海"},
+		{"hello", ""},
+	}
+	for _, tt := range tests {
+		got := extractLocation(tt.input)
+		if got != tt.want {
+			t.Errorf("extractLocation(%q) = %q, want %q", tt.input, got, tt.want)
+		}
+	}
+}
+
+func TestExtractLike(t *testing.T) {
+	tests := []struct{ input, want string }{
+		{"我喜欢打篮球", "打篮球"},
+		{"我最喜欢跑步", "跑步"},
+		{"nothing", ""},
+	}
+	for _, tt := range tests {
+		got := extractLike(tt.input)
+		if got != tt.want {
+			t.Errorf("extractLike(%q) = %q, want %q", tt.input, got, tt.want)
+		}
+	}
+}
+
+func TestExtractAge(t *testing.T) {
+	tests := []struct{ input, want string }{
+		{"我28岁", "28"},
+		{"我的年龄是30", "30"},
+		{"hello", ""},
+	}
+	for _, tt := range tests {
+		got := extractAge(tt.input)
+		if got != tt.want {
+			t.Errorf("extractAge(%q) = %q, want %q", tt.input, got, tt.want)
+		}
+	}
+}
+
+func TestDistillerGetRecentRecords(t *testing.T) {
+	d := NewDistiller(nil, t.TempDir(), DistillerConfig{})
+	d.Append("s1", "user", "a")
+	d.Append("s1", "user", "b")
+	d.Append("s1", "user", "c")
+
+	recent := d.GetRecentRecords(2)
+	if len(recent) != 2 {
+		t.Fatalf("expected 2 recent, got %d", len(recent))
+	}
+	if recent[0].Content != "b" || recent[1].Content != "c" {
+		t.Errorf("expected [b c], got %v", recent)
+	}
+}
+
+func TestDistillerStats(t *testing.T) {
+	d := NewDistiller(nil, t.TempDir(), DistillerConfig{
+		Interval:      5 * time.Minute,
+		RetentionDays: 3,
+		BatchSize:     10,
+	})
+	d.Append("s1", "user", "hello")
+	stats := d.Stats()
+	if stats["raw_records"] != 1 {
+		t.Errorf("expected 1 raw record, got %v", stats["raw_records"])
+	}
+}
+
+func TestTruncate(t *testing.T) {
+	if truncate("hello world", 5) != "hello..." {
+		t.Errorf("expected 'hello...', got %q", truncate("hello world", 5))
+	}
+	if truncate("hi", 10) != "hi" {
+		t.Errorf("expected 'hi', got %q", truncate("hi", 10))
+	}
+}
diff --git a/internal/memory/social/social_test.go b/internal/memory/social/social_test.go
new file mode 100644
index 0000000..9b0d4bd
--- /dev/null
+++ b/internal/memory/social/social_test.go
@@ -0,0 +1,195 @@
+package social
+
+import (
+	"path/filepath"
+	"testing"
+
+	"gitcode.com/JianFeeeee/HomeAgent/internal/memory"
+)
+
+func setupTestDB(t *testing.T) (*memory.GraphDB, *SocialStore) {
+	t.Helper()
+	db, err := memory.NewGraphDB(filepath.Join(t.TempDir(), "test.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	s := New(db)
+	return db, s
+}
+
+func TestNew(t *testing.T) {
+	s := New(nil)
+	if s == nil {
+		t.Fatal("expected non-nil social store")
+	}
+}
+
+func TestGetPersonNotFound(t *testing.T) {
+	_, s := setupTestDB(t)
+	defer s.db.Close()
+
+	_, err := s.GetPerson("不存在的人")
+	if err == nil {
+		t.Fatal("expected error for non-existent person")
+	}
+}
+
+func TestSetAndGetTrait(t *testing.T) {
+	_, s := setupTestDB(t)
+	defer s.db.Close()
+
+	err := s.SetTrait("张三", "性格", "开朗")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	val, found := s.GetTrait("张三", "性格")
+	if !found {
+		t.Fatal("trait not found")
+	}
+	if val != "开朗" {
+		t.Errorf("expected '开朗', got %q", val)
+	}
+}
+
+func TestUpdateTrait(t *testing.T) {
+	_, s := setupTestDB(t)
+	defer s.db.Close()
+
+	s.SetTrait("张三", "性格", "开朗")
+	s.SetTrait("张三", "性格", "内向")
+
+	val, found := s.GetTrait("张三", "性格")
+	if !found {
+		t.Fatal("trait not found after update")
+	}
+	if val != "内向" {
+		t.Errorf("expected '内向', got %q", val)
+	}
+}
+
+func TestAddAndGetRelation(t *testing.T) {
+	_, s := setupTestDB(t)
+	defer s.db.Close()
+
+	err := s.AddRelation("张三", "朋友", "李四")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	rels, err := s.GetRelations("张三")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(rels) != 1 {
+		t.Fatalf("expected 1 relation, got %d", len(rels))
+	}
+	if rels[0].Person != "李四" || rels[0].Relation != "朋友" {
+		t.Errorf("unexpected relation: %+v", rels[0])
+	}
+}
+
+func TestGetNetwork(t *testing.T) {
+	_, s := setupTestDB(t)
+	defer s.db.Close()
+
+	s.AddRelation("张三", "朋友", "李四")
+	s.AddRelation("李四", "同事", "王五")
+
+	network, err := s.GetNetwork("张三", 2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(network) < 2 {
+		t.Errorf("expected at least 2 persons in network, got %d", len(network))
+	}
+}
+
+func TestListPersons(t *testing.T) {
+	_, s := setupTestDB(t)
+	defer s.db.Close()
+
+	s.SetTrait("张三", "性格", "开朗")
+	s.AddRelation("张三", "朋友", "李四")
+
+	persons, err := s.ListPersons()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(persons) == 0 {
+		t.Fatal("expected at least one person")
+	}
+}
+
+func TestRemoveRelation(t *testing.T) {
+	_, s := setupTestDB(t)
+	defer s.db.Close()
+
+	s.AddRelation("张三", "朋友", "李四")
+	err := s.RemoveRelation("张三", "朋友", "李四")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	rels, _ := s.GetRelations("张三")
+	if len(rels) != 0 {
+		t.Errorf("expected 0 relations after remove, got %d", len(rels))
+	}
+}
+
+func TestNilDBSafety(t *testing.T) {
+	s := New(nil)
+
+	_, err := s.GetPerson("test")
+	if err == nil {
+		t.Error("expected error with nil db")
+	}
+
+	err = s.SetTrait("test", "t", "v")
+	if err == nil {
+		t.Error("expected error with nil db")
+	}
+
+	_, found := s.GetTrait("test", "t")
+	if found {
+		t.Error("expected not found with nil db")
+	}
+
+	_, err = s.ListPersons()
+	if err == nil {
+		t.Error("expected error with nil db")
+	}
+}
+
+func TestGetPersonProfile(t *testing.T) {
+	_, s := setupTestDB(t)
+	defer s.db.Close()
+
+	s.SetTrait("张三", "性格", "开朗")
+	s.SetTrait("张三", "职业", "程序员")
+	s.AddRelation("张三", "朋友", "李四")
+
+	profile, err := s.GetPerson("张三")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if profile.Name != "张三" {
+		t.Errorf("expected name '张三', got %q", profile.Name)
+	}
+	if profile.Traits["性格"] != "开朗" {
+		t.Errorf("expected trait '开朗', got %q", profile.Traits["性格"])
+	}
+	if profile.Traits["职业"] != "程序员" {
+		t.Errorf("expected trait '程序员', got %q", profile.Traits["职业"])
+	}
+	if len(profile.Relations) != 1 || profile.Relations[0].Person != "李四" {
+		// BFS 可能返回重复关系，用 set 去重验证
+		seen := make(map[string]bool)
+		for _, r := range profile.Relations {
+			seen[r.Person+"/"+r.Relation] = true
+		}
+		if !seen["李四/朋友"] {
+			t.Errorf("expected relation 李四/朋友, got %+v", profile.Relations)
+		}
+	}
+}
diff --git a/internal/memory/text/memory_test.go b/internal/memory/text/memory_test.go
new file mode 100644
index 0000000..29fa7fc
--- /dev/null
+++ b/internal/memory/text/memory_test.go
@@ -0,0 +1,332 @@
+package text
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestNew(t *testing.T) {
+	m := New(t.TempDir())
+	if m == nil {
+		t.Fatal("expected non-nil memory")
+	}
+}
+
+func TestAppendAndReplay(t *testing.T) {
+	dir := t.TempDir()
+	m := New(dir)
+	if err := m.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer m.Stop()
+
+	evt := Event{
+		Timestamp: time.Now().Unix(),
+		Source:    "test",
+		Input:     "hello",
+		Response:  "world",
+	}
+	if err := m.Append(evt); err != nil {
+		t.Fatal(err)
+	}
+
+	var count int
+	err := m.Replay(func(e Event) error {
+		count++
+		if e.Input != "hello" || e.Response != "world" {
+			t.Errorf("unexpected event: %+v", e)
+		}
+		return nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if count != 1 {
+		t.Errorf("expected 1 event, got %d", count)
+	}
+}
+
+func TestAppendMultiple(t *testing.T) {
+	dir := t.TempDir()
+	m := New(dir)
+	if err := m.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer m.Stop()
+
+	for i := 0; i < 10; i++ {
+		m.Append(Event{
+			Timestamp: time.Now().Unix(),
+			Source:    "test",
+			Input:     "msg",
+		})
+	}
+
+	var count int
+	m.Replay(func(e Event) error { count++; return nil })
+	if count != 10 {
+		t.Errorf("expected 10 events, got %d", count)
+	}
+}
+
+func TestRecentEvents(t *testing.T) {
+	dir := t.TempDir()
+	m := New(dir)
+	if err := m.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer m.Stop()
+
+	for i := 0; i < 10; i++ {
+		m.Append(Event{
+			Timestamp: time.Now().Unix(),
+			Source:    "test",
+			Input:     "msg",
+		})
+	}
+
+	recent, err := m.RecentEvents(3)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(recent) != 3 {
+		t.Errorf("expected 3 recent events, got %d", len(recent))
+	}
+}
+
+func TestFileCount(t *testing.T) {
+	dir := t.TempDir()
+	m := New(dir)
+	if err := m.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer m.Stop()
+
+	if m.FileCount() != 1 {
+		t.Errorf("expected 1 file, got %d", m.FileCount())
+	}
+}
+
+func TestConcurrentAppend(t *testing.T) {
+	dir := t.TempDir()
+	m := New(dir)
+	if err := m.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer m.Stop()
+
+	var wg sync.WaitGroup
+	for i := 0; i < 20; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			m.Append(Event{
+				Timestamp: time.Now().Unix(),
+				Source:    "test",
+				Input:     "concurrent",
+			})
+		}()
+	}
+	wg.Wait()
+
+	var count int
+	m.Replay(func(e Event) error { count++; return nil })
+	if count != 20 {
+		t.Errorf("expected 20 events, got %d", count)
+	}
+}
+
+func TestPurgeByFilter(t *testing.T) {
+	dir := t.TempDir()
+	m := New(dir)
+	if err := m.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer m.Stop()
+
+	m.Append(Event{Timestamp: 1, Source: "keep", Input: "a"})
+	m.Append(Event{Timestamp: 2, Source: "delete", Input: "b"})
+	m.Append(Event{Timestamp: 3, Source: "keep", Input: "c"})
+
+	removed, err := m.PurgeByFilter(func(e Event) bool {
+		return e.Source == "delete"
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if removed != 1 {
+		t.Errorf("expected 1 removed, got %d", removed)
+	}
+
+	var count int
+	m.Replay(func(e Event) error { count++; return nil })
+	if count != 2 {
+		t.Errorf("expected 2 events after purge, got %d", count)
+	}
+}
+
+func TestReplaceByFilter(t *testing.T) {
+	dir := t.TempDir()
+	m := New(dir)
+	if err := m.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer m.Stop()
+
+	m.Append(Event{Timestamp: 1, Source: "old", Input: "a"})
+
+	replaced, err := m.ReplaceByFilter(
+		func(e Event) bool { return e.Source == "old" },
+		func(e Event) Event { e.Source = "new"; return e },
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if replaced != 1 {
+		t.Errorf("expected 1 replaced, got %d", replaced)
+	}
+
+	var evt Event
+	m.Replay(func(e Event) error { evt = e; return nil })
+	if evt.Source != "new" {
+		t.Errorf("expected source 'new', got %q", evt.Source)
+	}
+}
+
+func TestRotation(t *testing.T) {
+	dir := t.TempDir()
+	m := New(dir, WithMaxSizeBytes(100)) // small max size to trigger rotation
+	if err := m.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer m.Stop()
+
+	// Write enough data to trigger rotation
+	for i := 0; i < 50; i++ {
+		m.Append(Event{
+			Timestamp: time.Now().Unix(),
+			Source:    "test",
+			Input:     strings.Repeat("x", 50),
+		})
+	}
+
+	if m.FileCount() > 1 {
+		t.Logf("rotation triggered: %d files", m.FileCount())
+	}
+}
+
+func TestStats(t *testing.T) {
+	dir := t.TempDir()
+	m := New(dir, WithMaxSizeBytes(1000), WithRotationInterval(30*time.Minute))
+	if err := m.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer m.Stop()
+
+	m.Append(Event{Timestamp: time.Now().Unix(), Source: "test", Input: "hello"})
+
+	stats := m.Stats()
+	if stats["file_count"] != 1 {
+		t.Errorf("expected 1 file, got %v", stats["file_count"])
+	}
+	if stats["rotation_bytes"].(int64) != 1000 {
+		t.Errorf("expected 1000 bytes, got %v", stats["rotation_bytes"])
+	}
+}
+
+func TestStopWithoutStart(t *testing.T) {
+	m := New(t.TempDir())
+	// Should not panic
+	m.Stop()
+}
+
+func TestEmptyDir(t *testing.T) {
+	dir := t.TempDir()
+	m := New(dir)
+	if err := m.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer m.Stop()
+
+	var count int
+	m.Replay(func(e Event) error { count++; return nil })
+	if count != 0 {
+		t.Errorf("expected 0 events in empty dir, got %d", count)
+	}
+}
+
+func TestFilePersistence(t *testing.T) {
+	dir := t.TempDir()
+
+	// Write events
+	m1 := New(dir)
+	m1.Start()
+	m1.Append(Event{Timestamp: 100, Source: "test", Input: "persist"})
+	m1.Stop()
+
+	// Read back with new instance
+	m2 := New(dir)
+	m2.Start()
+	defer m2.Stop()
+
+	var count int
+	m2.Replay(func(e Event) error {
+		count++
+		return nil
+	})
+	if count != 1 {
+		t.Errorf("expected 1 persisted event, got %d", count)
+	}
+}
+
+func TestListFiles(t *testing.T) {
+	dir := t.TempDir()
+	// Create a non-text file that should be ignored
+	os.WriteFile(filepath.Join(dir, "other.txt"), []byte("ignored"), 0644)
+
+	m := New(dir)
+	if err := m.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer m.Stop()
+
+	m.Append(Event{Timestamp: 1, Source: "test", Input: "a"})
+
+	files, err := m.listFiles()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(files) != 1 {
+		t.Errorf("expected 1 file, got %d", len(files))
+	}
+}
+
+func TestPurgeAll(t *testing.T) {
+	dir := t.TempDir()
+	m := New(dir)
+	if err := m.Start(); err != nil {
+		t.Fatal(err)
+	}
+	defer m.Stop()
+
+	m.Append(Event{Timestamp: 1, Source: "test", Input: "a"})
+	m.Append(Event{Timestamp: 2, Source: "test", Input: "b"})
+
+	removed, err := m.PurgeByFilter(func(e Event) bool { return true })
+	if err != nil {
+		t.Fatal(err)
+	}
+	if removed != 2 {
+		t.Errorf("expected 2 removed, got %d", removed)
+	}
+
+	var count int
+	m.Replay(func(e Event) error { count++; return nil })
+	if count != 0 {
+		t.Errorf("expected 0 events after full purge, got %d", count)
+	}
+}