diff --git a/internal/database/audit.go b/internal/database/audit.go
index 062d3f36..7853ddf5 100644
--- a/internal/database/audit.go
+++ b/internal/database/audit.go
@@ -21,6 +21,7 @@ type AuditLog struct {
 	UserAgent    string                 `json:"userAgent,omitempty"`
 	ResourceType string                 `json:"resourceType,omitempty"`
 	ResourceID   string                 `json:"resourceId,omitempty"`
+	ResourceAvailable *bool             `json:"resourceAvailable,omitempty"` // API-only: whether linked resource still exists
 	Message      string                 `json:"message"`
 	Detail       map[string]interface{} `json:"detail,omitempty"`
 }
diff --git a/internal/database/conversation.go b/internal/database/conversation.go
index 7c3ffff0..e51b9a6e 100644
--- a/internal/database/conversation.go
+++ b/internal/database/conversation.go
@@ -37,12 +37,12 @@ type Message struct {
 }
 
 // CreateConversation 创建新对话
-func (db *DB) CreateConversation(title string) (*Conversation, error) {
-	return db.CreateConversationWithWebshell("", title)
+func (db *DB) CreateConversation(title string, meta ConversationCreateMeta) (*Conversation, error) {
+	return db.CreateConversationWithWebshell("", title, meta)
 }
 
 // CreateConversationWithWebshell 创建新对话，可选绑定 WebShell 连接 ID（为空则普通对话）
-func (db *DB) CreateConversationWithWebshell(webshellConnectionID, title string) (*Conversation, error) {
+func (db *DB) CreateConversationWithWebshell(webshellConnectionID, title string, meta ConversationCreateMeta) (*Conversation, error) {
 	id := uuid.New().String()
 	now := time.Now()
 
@@ -62,12 +62,17 @@ func (db *DB) CreateConversationWithWebshell(webshellConnectionID, title string)
 		return nil, fmt.Errorf("创建对话失败: %w", err)
 	}
 
-	return &Conversation{
+	conv := &Conversation{
 		ID:        id,
 		Title:     title,
 		CreatedAt: now,
 		UpdatedAt: now,
-	}, nil
+	}
+	if webshellConnectionID != "" {
+		meta.WebShellConnectionID = webshellConnectionID
+	}
+	notifyConversationCreated(conv, meta)
+	return conv, nil
 }
 
 // GetConversationByWebshellConnectionID 根据 WebShell 连接 ID 获取该连接下最近一条对话（用于 AI 助手持久化）
@@ -182,6 +187,23 @@ func (db *DB) ListConversationsByWebshellConnectionID(connectionID string) ([]We
 	return list, rows.Err()
 }
 
+// ConversationExists reports whether a conversation row exists (lightweight check for audit links).
+func (db *DB) ConversationExists(id string) (bool, error) {
+	id = strings.TrimSpace(id)
+	if id == "" {
+		return false, nil
+	}
+	var one int
+	err := db.QueryRow("SELECT 1 FROM conversations WHERE id = ? LIMIT 1", id).Scan(&one)
+	if err == sql.ErrNoRows {
+		return false, nil
+	}
+	if err != nil {
+		return false, err
+	}
+	return true, nil
+}
+
 // GetConversation 获取对话
 func (db *DB) GetConversation(id string) (*Conversation, error) {
 	var conv Conversation
diff --git a/internal/database/conversation_create_meta.go b/internal/database/conversation_create_meta.go
new file mode 100644
index 00000000..4ba96530
--- /dev/null
+++ b/internal/database/conversation_create_meta.go
@@ -0,0 +1,29 @@
+package database
+
+// ConversationCreateMeta describes how a conversation was created (for audit hooks).
+type ConversationCreateMeta struct {
+	Source               string
+	WebShellConnectionID string
+	ClientIP             string
+	SessionHint          string
+}
+
+// ConversationCreateHook is invoked after a conversation row is inserted.
+type ConversationCreateHook func(conv *Conversation, meta ConversationCreateMeta)
+
+var conversationCreateHook ConversationCreateHook
+
+// SetConversationCreateHook registers a global hook (e.g. platform audit).
+func SetConversationCreateHook(h ConversationCreateHook) {
+	conversationCreateHook = h
+}
+
+func notifyConversationCreated(conv *Conversation, meta ConversationCreateMeta) {
+	if conversationCreateHook == nil || conv == nil {
+		return
+	}
+	if meta.Source == "" {
+		meta.Source = "unknown"
+	}
+	conversationCreateHook(conv, meta)
+}