fix(avatar): prevent takeover loops and isolate settings

Reviewed-on: #7

digital-avatar-app/backend/database.py

@@ -38,7 +38,7 @@ def init_db():
         ("avatars", "owner_id", "VARCHAR DEFAULT ''"),
         ("authorizations", "takeover_enabled", "BOOLEAN DEFAULT 0"),
         ("authorizations", "takeover_mode", "VARCHAR DEFAULT 'immediate'"),
-        ("authorizations", "takeover_delay_seconds", "INTEGER DEFAULT 30"),
+        ("authorizations", "takeover_delay_seconds", "INTEGER DEFAULT 180"),
         ("avatars", "share_token", "VARCHAR DEFAULT NULL"),
         ("token_account", "user_id", "VARCHAR DEFAULT ''"),
         ("token_account", "total_granted", "BIGINT DEFAULT 0"),
@@ -47,6 +47,7 @@ def init_db():
         ("token_account", "updated_at", "TIMESTAMP"),
     )
     _normalize_optional_unique_values()
+    _normalize_takeover_delays()
     _create_token_indexes()
 
 
@@ -66,6 +67,15 @@ def _normalize_optional_unique_values():
         conn.exec_driver_sql("UPDATE avatars SET share_token = NULL WHERE share_token = ''")
 
 
+def _normalize_takeover_delays():
+    with engine.begin() as conn:
+        # The old 30-second column default was never wired into the scheduler.
+        conn.exec_driver_sql(
+            "UPDATE authorizations SET takeover_delay_seconds = 180 "
+            "WHERE takeover_delay_seconds IS NULL OR takeover_delay_seconds = 30"
+        )
+
+
 def _create_token_indexes():
     with engine.begin() as conn:
         conn.exec_driver_sql(

digital-avatar-app/backend/models.py

@@ -67,7 +67,7 @@ class Authorization(Base):
     status = Column(String, default="active")  # active | inactive
     takeover_enabled = Column(Boolean, default=False)  # 是否开启分身接管
     takeover_mode = Column(String, default="immediate")  # immediate | delayed
-    takeover_delay_seconds = Column(Integer, default=30)  # 延迟秒数
+    takeover_delay_seconds = Column(Integer, default=180)  # 延迟秒数，默认 3 分钟
     created_at = Column(DateTime, server_default=func.now())
 
     def to_dict(self):

digital-avatar-app/backend/routers/authorizations.py

@@ -2,7 +2,7 @@ from fastapi import APIRouter, Body, Depends, Header, HTTPException
 from sqlalchemy.orm import Session
 
 from database import get_db
-from models import Authorization, TakeoverCursor, TakeoverReplyTask
+from models import Authorization, Avatar, TakeoverCursor, TakeoverReplyTask
 from responses import fail, ok
 from routers.avatars import _require_owned_avatar
 
@@ -14,6 +14,10 @@ ALLOWED_PERMISSIONS = set(PERMISSION_ORDER)
 AVATAR_PERMISSION_ORDER = PERMISSION_ORDER
 AVATAR_PERMISSION_KEY = "authorizationPermissions"
 DEFAULT_AVATAR_PERMISSIONS = ["friend", "chat"]
+TAKEOVER_DELAY_KEY = "takeoverReplyDelaySeconds"
+DEFAULT_TAKEOVER_DELAY_SECONDS = 180
+MIN_TAKEOVER_DELAY_SECONDS = 3
+MAX_TAKEOVER_DELAY_SECONDS = 86_400
 LEGACY_PERMISSION_MAP = {
     "read": "browse",
     "reply": "chat",
@@ -91,9 +95,62 @@ def _permission_settings_payload(avatar) -> dict:
     return {
         "avatarId": avatar.id,
         "permissions": _stored_avatar_permissions(avatar),
+        "takeoverReplyDelaySeconds": _stored_takeover_delay(avatar),
     }
 
 
+def _stored_takeover_delay(avatar) -> int:
+    raw = (avatar.config or {}).get(TAKEOVER_DELAY_KEY, DEFAULT_TAKEOVER_DELAY_SECONDS)
+    if isinstance(raw, bool):
+        return DEFAULT_TAKEOVER_DELAY_SECONDS
+    try:
+        delay = int(raw)
+    except (TypeError, ValueError):
+        return DEFAULT_TAKEOVER_DELAY_SECONDS
+    if not MIN_TAKEOVER_DELAY_SECONDS <= delay <= MAX_TAKEOVER_DELAY_SECONDS:
+        return DEFAULT_TAKEOVER_DELAY_SECONDS
+    return delay
+
+
+def _validate_takeover_delay(value) -> int:
+    if isinstance(value, bool) or not isinstance(value, int):
+        raise ValueError("自动回复等待时间必须是整数秒")
+    if not MIN_TAKEOVER_DELAY_SECONDS <= value <= MAX_TAKEOVER_DELAY_SECONDS:
+        raise ValueError("自动回复等待时间需在 3 秒到 24 小时之间")
+    return value
+
+
+def _disable_other_takeovers(db: Session, avatar) -> list[str]:
+    disabled_ids = []
+    others = (
+        db.query(Avatar)
+        .filter(Avatar.owner_id == avatar.owner_id, Avatar.id != avatar.id)
+        .all()
+    )
+    for other in others:
+        permissions = _stored_avatar_permissions(other)
+        if "takeover" not in permissions:
+            continue
+        other.config = {
+            **(other.config or {}),
+            AVATAR_PERMISSION_KEY: [item for item in permissions if item != "takeover"],
+        }
+        disabled_ids.append(other.id)
+        tasks = (
+            db.query(TakeoverReplyTask)
+            .filter(
+                TakeoverReplyTask.avatar_id == other.id,
+                TakeoverReplyTask.status.in_(("pending", "generating", "ready", "sending")),
+            )
+            .all()
+        )
+        for task in tasks:
+            task.status = "cancelled"
+            task.cancel_reason = "another_avatar_takeover_enabled"
+            task.locked_at = None
+    return disabled_ids
+
+
 def _require_authorization(db: Session, avatar_id: str, authorization_id: str) -> Authorization:
     authorization = (
         db.query(Authorization)
@@ -144,10 +201,19 @@ def update_permission_settings(
     db: Session = Depends(get_db),
 ):
     avatar = _require_owned_avatar(db, avatar_id, authorization)
-    if "permissions" not in payload:
+    if "permissions" not in payload and TAKEOVER_DELAY_KEY not in payload:
-        return fail("缺少 permissions", 400)
+        return fail("缺少授权设置", 400)
     try:
-        permissions = _normalize_avatar_permissions(payload["permissions"])
+        permissions = (
+            _normalize_avatar_permissions(payload["permissions"])
+            if "permissions" in payload
+            else _stored_avatar_permissions(avatar)
+        )
+        takeover_delay = (
+            _validate_takeover_delay(payload[TAKEOVER_DELAY_KEY])
+            if TAKEOVER_DELAY_KEY in payload
+            else _stored_takeover_delay(avatar)
+        )
     except ValueError as exc:
         return fail(str(exc), 400)
 
@@ -155,7 +221,9 @@ def update_permission_settings(
     avatar.config = {
         **(avatar.config or {}),
         AVATAR_PERMISSION_KEY: permissions,
+        TAKEOVER_DELAY_KEY: takeover_delay,
     }
+    disabled_avatar_ids = _disable_other_takeovers(db, avatar) if "takeover" in permissions else []
     cursor = db.query(TakeoverCursor).filter(TakeoverCursor.avatar_id == avatar.id).first()
     if cursor and "takeover" in permissions and "takeover" not in previous_permissions:
         cursor.initialized = False
@@ -179,7 +247,9 @@ def update_permission_settings(
             task.locked_at = None
     db.commit()
     db.refresh(avatar)
-    return ok(_permission_settings_payload(avatar), "授权设置已保存")
+    response = _permission_settings_payload(avatar)
+    response["disabledAvatarIds"] = disabled_avatar_ids
+    return ok(response, "授权设置已保存")
 
 
 @router.get("/avatar/{avatar_id}/authorizations")
@@ -240,7 +310,7 @@ def create_auth(
         status="active",
         takeover_enabled=False,
         takeover_mode="immediate",
-        takeover_delay_seconds=30,
+        takeover_delay_seconds=DEFAULT_TAKEOVER_DELAY_SECONDS,
     )
     db.add(item)
     db.commit()

digital-avatar-app/backend/routers/avatars.py

@@ -6,7 +6,17 @@ from sqlalchemy.orm import Session
 
 from database import get_db
 from routers.knowledge import UPLOAD_DIR
-from models import Avatar, KnowledgeDoc, KnowledgeChunk, QAPair, Authorization, User
+from models import (
+    Authorization,
+    Avatar,
+    KnowledgeChunk,
+    KnowledgeDoc,
+    QAPair,
+    TakeoverCursor,
+    TakeoverMessage,
+    TakeoverReplyTask,
+    User,
+)
 from responses import ok, fail
 
 router = APIRouter(tags=["分身"])
@@ -74,18 +84,21 @@ def list_avatars(page: int = 1, limit: int = 20, authorization: str = Header(Non
 
 
 @router.get("/avatar/{avatar_id}")
-def get_avatar(avatar_id: str, db: Session = Depends(get_db)):
+def get_avatar(
-    a = db.query(Avatar).filter(Avatar.id == avatar_id).first()
+    avatar_id: str,
-    if not a:
+    authorization: str = Header(None),
-        return fail("分身不存在", 404)
+    db: Session = Depends(get_db),
-    return ok(a.to_dict())
+):
+    return ok(_require_owned_avatar(db, avatar_id, authorization).to_dict())
 
 
 @router.post("/avatar")
 def create_avatar(payload: dict = Body(...), authorization: str = Header(None), db: Session = Depends(get_db)):
     user = _resolve_user(authorization, db)
+    if not user:
+        raise HTTPException(status_code=401, detail="未登录")
     a = Avatar(
-        owner_id=user.huihui_user_id if user else "",
+        owner_id=user.huihui_user_id,
         name=payload.get("name", "未命名分身"),
         display_name=payload.get("displayName", "") or payload.get("display_name", ""),
         description=payload.get("description", ""),
@@ -102,10 +115,13 @@ def create_avatar(payload: dict = Body(...), authorization: str = Header(None),
 
 
 @router.put("/avatar/{avatar_id}")
-def update_avatar(avatar_id: str, payload: dict = Body(...), db: Session = Depends(get_db)):
+def update_avatar(
-    a = db.query(Avatar).filter(Avatar.id == avatar_id).first()
+    avatar_id: str,
-    if not a:
+    payload: dict = Body(...),
-        return fail("分身不存在", 404)
+    authorization: str = Header(None),
+    db: Session = Depends(get_db),
+):
+    a = _require_owned_avatar(db, avatar_id, authorization)
     mapping = {
         "displayName": "display_name",
         "photoUrl": "photo_url",
@@ -114,22 +130,32 @@ def update_avatar(avatar_id: str, payload: dict = Body(...), db: Session = Depen
     for key in ("name", "displayName", "description", "photoUrl", "emoji", "status", "tokenBalance", "config"):
         if key in payload:
             col = mapping.get(key, key)
-            setattr(a, col, payload[key])
+            value = payload[key]
+            if key == "config":
+                if not isinstance(value, dict):
+                    return fail("分身配置格式不正确", 400)
+                value = {**(a.config or {}), **value}
+            setattr(a, col, value)
     db.commit()
     db.refresh(a)
     return ok(a.to_dict())
 
 
 @router.delete("/avatar/{avatar_id}")
-def delete_avatar(avatar_id: str, db: Session = Depends(get_db)):
+def delete_avatar(
-    a = db.query(Avatar).filter(Avatar.id == avatar_id).first()
+    avatar_id: str,
-    if not a:
+    authorization: str = Header(None),
-        return fail("分身不存在", 404)
+    db: Session = Depends(get_db),
+):
+    a = _require_owned_avatar(db, avatar_id, authorization)
     # 级联清理关联数据，避免孤儿记录
     db.query(KnowledgeDoc).filter(KnowledgeDoc.avatar_id == avatar_id).delete()
     db.query(KnowledgeChunk).filter(KnowledgeChunk.avatar_id == avatar_id).delete()
     db.query(QAPair).filter(QAPair.avatar_id == avatar_id).delete()
     db.query(Authorization).filter(Authorization.avatar_id == avatar_id).delete()
+    db.query(TakeoverReplyTask).filter(TakeoverReplyTask.avatar_id == avatar_id).delete()
+    db.query(TakeoverMessage).filter(TakeoverMessage.avatar_id == avatar_id).delete()
+    db.query(TakeoverCursor).filter(TakeoverCursor.avatar_id == avatar_id).delete()
     db.delete(a)
     db.commit()
     return ok({"success": True})

digital-avatar-app/backend/routers/chat.py

@@ -34,6 +34,19 @@ QA_SEMANTIC_THRESHOLD = 0.72
 QA_MATCH_MARGIN = 0.06
 KNOWLEDGE_MIN_SCORE = float(os.getenv("KNOWLEDGE_MIN_SCORE", "0.42"))
 
+_WRITING_SYSTEM_PATTERNS = {
+    "han": re.compile(r"[\u3400-\u4dbf\u4e00-\u9fff]"),
+    "latin": re.compile(r"[A-Za-z\u00c0-\u024f]"),
+    "cyrillic": re.compile(r"[\u0400-\u052f]"),
+    "arabic": re.compile(r"[\u0600-\u06ff]"),
+    "hebrew": re.compile(r"[\u0590-\u05ff]"),
+    "devanagari": re.compile(r"[\u0900-\u097f]"),
+    "thai": re.compile(r"[\u0e00-\u0e7f]"),
+    "greek": re.compile(r"[\u0370-\u03ff]"),
+}
+_JAPANESE_KANA = re.compile(r"[\u3040-\u30ff]")
+_KOREAN_HANGUL = re.compile(r"[\uac00-\ud7af\u1100-\u11ff]")
+
 
 class ChatMessage(BaseModel):
     role: str = Field(pattern="^(user|assistant)$")
@@ -70,6 +83,30 @@ def _normalize_question(value: str) -> str:
     return value.translate(str.maketrans("", "", string.punctuation + "，。！？；：、（）【】「」‘’“”《》"))
 
 
+def _dominant_writing_system(value: str) -> str:
+    value = value or ""
+    if _JAPANESE_KANA.search(value):
+        return "japanese"
+    if _KOREAN_HANGUL.search(value):
+        return "korean"
+    counts = {
+        name: len(pattern.findall(value))
+        for name, pattern in _WRITING_SYSTEM_PATTERNS.items()
+    }
+    name, count = max(counts.items(), key=lambda item: item[1])
+    return name if count else "unknown"
+
+
+def _qa_requires_language_adaptation(question: str, answer: str) -> bool:
+    question_system = _dominant_writing_system(question)
+    answer_system = _dominant_writing_system(answer)
+    return (
+        question_system != "unknown"
+        and answer_system != "unknown"
+        and question_system != answer_system
+    )
+
+
 def _canonicalize_question(value: str) -> str:
     value = _normalize_question(value)
     replacements = (
@@ -189,7 +226,14 @@ def _config(avatar: Avatar) -> dict:
     }
 
 
-def _build_prompt(avatar: Avatar, history: list[Any], question: str, knowledge_hits: list[dict]) -> list[dict]:
+def _build_prompt(
+    avatar: Avatar,
+    history: list[Any],
+    question: str,
+    knowledge_hits: list[dict],
+    *,
+    standard_answer: str = "",
+) -> list[dict]:
     config = _config(avatar)
     description = (getattr(avatar, "description", "") or "").strip()
     knowledge = "\n".join(
@@ -210,7 +254,7 @@ def _build_prompt(avatar: Avatar, history: list[Any], question: str, knowledge_h
     profile = "；".join(f"{label}：{value}" for label, value in profile_items)
     system = (
         f"你的专业或服务范围是：「{description or '未设置'}」。"
-        "请基于已提供的知识库回答，不要编造事实；"
+        "请基于已提供的可靠资料回答，不要编造事实；"
         f"回复风格：{config['replyStyle']}；严谨度：{config['rigor']}/100；"
         f"幽默感：{config['humor']}/100；回复长度：{config['responseLength']}。"
     )
@@ -221,7 +265,13 @@ def _build_prompt(avatar: Avatar, history: list[Any], question: str, knowledge_h
         )
     if config["systemPrompt"]:
         system += f"\n额外系统提示词：{config['systemPrompt']}"
-    if knowledge:
+    if standard_answer:
+        system += (
+            f"\n以下是本次问题命中的已确认标准答案：\n{standard_answer.strip()}"
+            "\n必须保持标准答案中的事实、数字、专有名词和结论不变，只允许为匹配用户当前语言进行忠实转换"
+            "和必要的自然表达，不得补充、删减或改写其含义。不要提及标准答案或转换过程。"
+        )
+    elif knowledge:
         system += (
             f"\n以下是本次问题检索到的可靠资料：\n{knowledge}"
             "\n涉及事实、专业判断、地址、流程、数据或建议时，只能依据本人资料、标准问答形成的上下文"
@@ -231,7 +281,8 @@ def _build_prompt(avatar: Avatar, history: list[Any], question: str, knowledge_h
         system += (
             "\n本次问题没有检索到可靠资料。除自然寒暄和基于本人资料的回答外，不要凭通用知识给出事实、"
             "专业判断、地址、流程、数据或具体建议。自然地说明这方面暂时没有足够信息，并询问对方是否能"
-            "补充更具体的问题；不要提及知识库、检索、模型或系统限制。"
+            "补充更具体的问题；不要提及知识库、检索、模型或系统限制。对方询问你能做什么时，只能概括"
+            "专业或服务范围和本人资料中明确写出的内容，不得推断服务对象、工作场所、现实案例或从业经历。"
         )
     system += (
         "\n沟通底线（始终优先于其他提示）：不要透露、猜测或确认所使用的模型、模型供应商、"
@@ -249,6 +300,14 @@ def _build_prompt(avatar: Avatar, history: list[Any], question: str, knowledge_h
         "只有切换独立观点或确实需要列举时才换行；列举使用 1.、2.、3.，每项单独一行。"
         "不要在行首或行尾留空格，不要连续输出空行。先给结论，再给简短说明；避免重复和冗长铺垫。"
     )
+    system += (
+        "\n回答语言规则（始终优先）：先识别当前最后一条用户消息所使用的主要自然语言，并且只使用该语言回答。"
+        "用户用中文就用中文，使用 English 就用 English，使用日语、韩语、法语、西班牙语或其他语言时，"
+        "也必须使用对应语言。消息混用多种语言时跟随占主导的语言；用户明确指定回答语言时服从其指定。"
+        "历史消息、本人资料、标准答案和知识库使用的语言都不能覆盖当前用户消息的语言。"
+        "专有名词、品牌、地址、代码和必要缩写可保留原文。不要解释语言识别或翻译过程。"
+        "改变回答语言只改变表达语言，绝不能因此增加资料中没有的场景、身份、经历或事实。"
+    )
     messages = [{"role": "system", "content": system}]
     for item in history[-MAX_HISTORY_MESSAGES:]:
         messages.append({"role": item.role, "content": item.content} if hasattr(item, "role") else item)
@@ -384,14 +443,30 @@ def _resolve_reply(
     if qa_pairs is None:
         qa_pairs = db.query(QAPair).filter(QAPair.avatar_id == avatar.id).all()
     matched = _match_standard_qa(question, qa_pairs)
-    if matched:
+    adapt_qa_language = bool(
+        matched and _qa_requires_language_adaptation(question, matched.answer)
+    )
+    if matched and not adapt_qa_language:
         return {"answer": matched.answer, "source": "qa", "references": []}
 
+    if matched:
+        hits = []
+        messages = _build_prompt(
+            avatar,
+            history,
+            question,
+            hits,
+            standard_answer=matched.answer,
+        )
+    else:
         search_fn = search_fn or (lambda query, avatar_id: _search_knowledge(db, avatar_id, query))
         hits = search_fn(question, avatar.id)
         messages = _build_prompt(avatar, history, question, hits)
     config = _config(avatar)
-    temperature = min(0.45 if hits else 0.25, 0.2 + config["creativity"] / 100 * 0.6)
+    temperature = 0.0 if matched else min(
+        0.45 if hits else 0.25,
+        0.2 + config["creativity"] / 100 * 0.6,
+    )
     token_usage = None
     if model_client is not None:
         answer = model_client(messages=messages, temperature=temperature)
@@ -423,7 +498,7 @@ def _resolve_reply(
             raise
     result = {
         "answer": answer,
-        "source": "knowledge" if hits else "qwen",
+        "source": "qa" if matched else ("knowledge" if hits else "qwen"),
         "references": hits,
     }
     if token_usage:
@@ -442,14 +517,32 @@ def _stream_reply(
 ):
     qa_pairs = db.query(QAPair).filter(QAPair.avatar_id == avatar.id).all()
     matched = _match_standard_qa(question, qa_pairs)
-    if matched:
+    adapt_qa_language = bool(
+        matched and _qa_requires_language_adaptation(question, matched.answer)
+    )
+    messages, reservation = [], None
+    if matched and not adapt_qa_language:
         source, references, chunks = "qa", [], _iter_text_chunks(matched.answer)
+    else:
+        if matched:
+            references = []
+            source = "qa"
+            messages = _build_prompt(
+                avatar,
+                history,
+                question,
+                references,
+                standard_answer=matched.answer,
+            )
         else:
             references = _search_knowledge(db, avatar.id, question)
             source = "knowledge" if references else "qwen"
-        config = _config(avatar)
-        temperature = min(0.45 if references else 0.25, 0.2 + config["creativity"] / 100 * 0.6)
             messages = _build_prompt(avatar, history, question, references)
+        config = _config(avatar)
+        temperature = 0.0 if matched else min(
+            0.45 if references else 0.25,
+            0.2 + config["creativity"] / 100 * 0.6,
+        )
         model_config = get_chat_model_config()
         reservation = reserve_avatar_tokens(
             db,
@@ -460,8 +553,6 @@ def _stream_reply(
             model_config.max_tokens,
         )
         chunks = _iter_qwen_stream(messages, temperature, model_config)
-    if matched:
-        messages, reservation = [], None
     if public:
         source, references = "public", []
 

digital-avatar-app/backend/routers/takeover.py

@@ -8,13 +8,25 @@ from sqlalchemy.orm import Session
 from database import get_db
 from models import TakeoverCursor, TakeoverReplyTask, User
 from responses import fail, ok
-from routers.authorizations import _require_authorization
+from routers.authorizations import (
+    DEFAULT_TAKEOVER_DELAY_SECONDS,
+    MAX_TAKEOVER_DELAY_SECONDS,
+    MIN_TAKEOVER_DELAY_SECONDS,
+    _require_authorization,
+    _stored_takeover_delay,
+)
 from routers.avatars import _require_owned_avatar
 
 router = APIRouter(tags=["分身接管"])
 BOXIM_STATUS_FRESH_SECONDS = 60
 
 
+def _delay_label(seconds: int) -> str:
+    if seconds % 60 == 0:
+        return f"{seconds // 60} 分钟"
+    return f"{seconds} 秒"
+
+
 @router.get("/avatar/{avatar_id}/takeover/status")
 def get_takeover_status(
     avatar_id: str,
@@ -24,6 +36,7 @@ def get_takeover_status(
     avatar = _require_owned_avatar(db, avatar_id, authorization)
     permissions = (avatar.config or {}).get("authorizationPermissions", [])
     enabled = isinstance(permissions, list) and "takeover" in permissions
+    reply_delay_seconds = _stored_takeover_delay(avatar)
     user = db.query(User).filter(User.huihui_user_id == avatar.owner_id).first()
     cursor = db.query(TakeoverCursor).filter(TakeoverCursor.avatar_id == avatar.id).first()
     pending_count = (
@@ -49,7 +62,10 @@ def get_takeover_status(
         and cursor.last_polled_at
         >= datetime.utcnow() - timedelta(seconds=BOXIM_STATUS_FRESH_SECONDS)
     ):
-        status, message = "ready", "BOXIM 已连接，收到私聊消息 3 秒后自动回复"
+        status, message = (
+            "ready",
+            f"BOXIM 已连接，收到私聊消息 {_delay_label(reply_delay_seconds)}后自动回复",
+        )
     else:
         status, message = "connecting", "正在连接 BOXIM"
 
@@ -59,6 +75,7 @@ def get_takeover_status(
             "status": status,
             "message": message,
             "pendingCount": pending_count,
+            "takeoverReplyDelaySeconds": reply_delay_seconds,
             "lastPolledAt": cursor.last_polled_at.isoformat() if cursor and cursor.last_polled_at else None,
         }
     )
@@ -91,7 +108,7 @@ def update_takeover_config(
     auth = _require_authorization(db, avatar_id, str(auth_id))
     enabled = bool(auth.takeover_enabled)
     mode = auth.takeover_mode or "immediate"
-    delay = auth.takeover_delay_seconds or 30
+    delay = auth.takeover_delay_seconds or DEFAULT_TAKEOVER_DELAY_SECONDS
 
     if _has(payload, "takeoverEnabled", "takeover_enabled"):
         raw_enabled = _read(payload, "takeoverEnabled", "takeover_enabled")
@@ -106,8 +123,12 @@ def update_takeover_config(
 
     if _has(payload, "takeoverDelaySeconds", "takeover_delay_seconds"):
         delay = _read(payload, "takeoverDelaySeconds", "takeover_delay_seconds")
-        if isinstance(delay, bool) or not isinstance(delay, int) or not 5 <= delay <= 3600:
+        if (
-            return fail("延迟时间需在 5 到 3600 秒之间", 400)
+            isinstance(delay, bool)
+            or not isinstance(delay, int)
+            or not MIN_TAKEOVER_DELAY_SECONDS <= delay <= MAX_TAKEOVER_DELAY_SECONDS
+        ):
+            return fail("延迟时间需在 3 秒到 24 小时之间", 400)
 
     if enabled and auth.target_type != "user":
         return fail("本期仅支持对会会用户开启单聊接管", 400)

digital-avatar-app/backend/services/takeover_service.py

@@ -28,6 +28,14 @@ MAX_PROMPT_LENGTH = 4000
 MAX_STALE_SECONDS = 120
 STUCK_LOCK_SECONDS = 90
 TAKEOVER_PERMISSION = "takeover"
+TAKEOVER_DELAY_KEY = "takeoverReplyDelaySeconds"
+DEFAULT_REPLY_DELAY_SECONDS = 180
+MIN_REPLY_DELAY_SECONDS = 3
+MAX_REPLY_DELAY_SECONDS = 86_400
+HUMAN_PAUSE_SECONDS = 600
+RATE_LIMIT_WINDOW_SECONDS = 300
+RATE_LIMIT_MAX_REPLIES = 5
+AVATAR_LOCAL_ID_PREFIX = "880"
 
 
 def _utcnow() -> datetime:
@@ -70,15 +78,43 @@ def _plain_text_reply(value: str) -> str:
     return "\n".join(line for line in lines if line).strip()
 
 
+def _avatar_local_id(owner_id: str, trigger_message_id: str) -> str:
+    """Build a deterministic BOXIM idempotency key that also marks avatar traffic."""
+    digest = hashlib.sha256(f"{owner_id}:{trigger_message_id}".encode("utf-8")).digest()
+    suffix = int.from_bytes(digest[:8], "big") % (10**15)
+    return f"{AVATAR_LOCAL_ID_PREFIX}{suffix:015d}"
+
+
+def _is_avatar_local_id(value: str | None) -> bool:
+    local_id = str(value or "").strip()
+    return len(local_id) == 18 and local_id.isdigit() and local_id.startswith(AVATAR_LOCAL_ID_PREFIX)
+
+
+def _configured_reply_delay(avatar: Avatar, fallback: int | None = None) -> int:
+    raw = (avatar.config or {}).get(
+        TAKEOVER_DELAY_KEY,
+        fallback if fallback is not None else DEFAULT_REPLY_DELAY_SECONDS,
+    )
+    if isinstance(raw, bool):
+        return DEFAULT_REPLY_DELAY_SECONDS
+    try:
+        delay = int(raw)
+    except (TypeError, ValueError):
+        return DEFAULT_REPLY_DELAY_SECONDS
+    if not MIN_REPLY_DELAY_SECONDS <= delay <= MAX_REPLY_DELAY_SECONDS:
+        return DEFAULT_REPLY_DELAY_SECONDS
+    return delay
+
+
 class TakeoverService:
-    """Poll BOXIM, prepare replies during the grace period, then send at +3s."""
+    """Poll BOXIM, honor the owner grace period, then generate and send one reply."""
 
     def __init__(
         self,
         session_factory: Callable[[], Session],
         boxim_client: BoxIMClient,
         *,
-        reply_delay_seconds: int = 3,
+        reply_delay_seconds: int | None = None,
         now: Callable[[], datetime] = _utcnow,
     ):
         self.session_factory = session_factory
@@ -119,11 +155,17 @@ class TakeoverService:
     def _enabled_avatar_ids(self) -> list[str]:
         db = self.session_factory()
         try:
-            return [
+            avatars = (
-                avatar.id
+                db.query(Avatar)
-                for avatar in db.query(Avatar).filter(Avatar.status == "active").all()
+                .filter(Avatar.status == "active")
-                if _takeover_enabled(avatar)
+                .order_by(Avatar.updated_at.desc(), Avatar.created_at.desc())
-            ]
+                .all()
+            )
+            selected = {}
+            for avatar in avatars:
+                if _takeover_enabled(avatar) and avatar.owner_id not in selected:
+                    selected[avatar.owner_id] = avatar.id
+            return list(selected.values())
         finally:
             db.close()
 
@@ -201,13 +243,20 @@ class TakeoverService:
     def _forget_boxim_session(self, user_id: str):
         self._sessions.pop(user_id, None)
 
-    def _disable_after_connection_failure(
+    def _record_connection_failure(
         self,
         db: Session,
         avatar: Avatar,
         cursor: TakeoverCursor,
         message: str,
+        *,
+        disable_takeover: bool,
     ):
+        cursor.last_error = message
+        cursor.last_polled_at = self.now()
+        if not disable_takeover:
+            return
+
         permissions = (avatar.config or {}).get("authorizationPermissions", [])
         avatar.config = {
             **(avatar.config or {}),
@@ -217,8 +266,6 @@ class TakeoverService:
                 if permission != TAKEOVER_PERMISSION
             ],
         }
-        cursor.last_error = message
-        cursor.last_polled_at = self.now()
         tasks = (
             db.query(TakeoverReplyTask)
             .filter(
@@ -245,11 +292,12 @@ class TakeoverService:
                 db.add(cursor)
                 db.flush()
             if not user or not user.huihui_token:
-                self._disable_after_connection_failure(
+                self._record_connection_failure(
                     db,
                     avatar,
                     cursor,
                     "请重新登录会会生产账号后再开启主动接管",
+                    disable_takeover=True,
                 )
                 db.commit()
                 return False
@@ -268,11 +316,24 @@ class TakeoverService:
                 if isinstance(exc, BoxIMError) and exc.auth_error:
                     self._forget_boxim_session(user.id)
                     message = "BOXIM 授权已失效，请重新登录会会生产账号"
+                    disable_takeover = True
                 else:
                     message = f"BOXIM 暂时连接失败：{str(exc)[:160]}"
-                self._disable_after_connection_failure(db, avatar, cursor, message)
+                    disable_takeover = False
+                self._record_connection_failure(
+                    db,
+                    avatar,
+                    cursor,
+                    message,
+                    disable_takeover=disable_takeover,
+                )
                 db.commit()
-                logger.warning("BOXIM sync failed for avatar %s: %s", avatar.id, exc)
+                logger.warning(
+                    "BOXIM sync failed for avatar %s (will_retry=%s): %s",
+                    avatar.id,
+                    not disable_takeover,
+                    exc,
+                )
                 return False
 
             messages.sort(key=lambda item: (_numeric_id(item.get("id")), item.get("sendTime") or 0))
@@ -350,13 +411,21 @@ class TakeoverService:
 
         now = self.now()
         send_time = _boxim_time(message.get("sendTime"), now)
-        is_avatar = False
+        is_avatar = _is_avatar_local_id(local_id)
-        if direction == "outgoing" and local_id:
+        if not is_avatar and local_id:
             is_avatar = bool(
                 db.query(TakeoverReplyTask)
                 .filter(
-                    TakeoverReplyTask.owner_id == avatar.owner_id,
                     TakeoverReplyTask.boxim_local_id == local_id,
+                    TakeoverReplyTask.status.in_(("ready", "sending", "sent")),
+                )
+                .first()
+            )
+        if not is_avatar:
+            is_avatar = bool(
+                db.query(TakeoverReplyTask)
+                .filter(
+                    TakeoverReplyTask.boxim_sent_message_id == message_id,
                     TakeoverReplyTask.status == "sent",
                 )
                 .first()
@@ -385,8 +454,52 @@ class TakeoverService:
             return
         if (now - send_time).total_seconds() > MAX_STALE_SECONDS:
             return
+        if is_avatar:
+            self._cancel_conversation(db, avatar.owner_id, peer_id, "peer_avatar_message")
+            return
+        if self._human_pause_active(db, avatar.owner_id, peer_id, now):
+            self._cancel_conversation(db, avatar.owner_id, peer_id, "owner_active")
+            return
+        if self._conversation_rate_limited(db, avatar.owner_id, peer_id, now):
+            self._cancel_conversation(db, avatar.owner_id, peer_id, "rate_limited")
+            return
         self._schedule_reply(db, avatar, event)
 
+    @staticmethod
+    def _human_pause_active(db: Session, owner_id: str, peer_id: str, now: datetime) -> bool:
+        threshold = now - timedelta(seconds=HUMAN_PAUSE_SECONDS)
+        return bool(
+            db.query(TakeoverMessage.id)
+            .filter(
+                TakeoverMessage.owner_id == owner_id,
+                TakeoverMessage.peer_id == peer_id,
+                TakeoverMessage.direction == "outgoing",
+                TakeoverMessage.is_avatar.is_(False),
+                TakeoverMessage.send_time >= threshold,
+            )
+            .first()
+        )
+
+    @staticmethod
+    def _conversation_rate_limited(
+        db: Session,
+        owner_id: str,
+        peer_id: str,
+        now: datetime,
+    ) -> bool:
+        threshold = now - timedelta(seconds=RATE_LIMIT_WINDOW_SECONDS)
+        return (
+            db.query(TakeoverReplyTask.id)
+            .filter(
+                TakeoverReplyTask.owner_id == owner_id,
+                TakeoverReplyTask.peer_id == peer_id,
+                TakeoverReplyTask.status == "sent",
+                TakeoverReplyTask.sent_at >= threshold,
+            )
+            .count()
+            >= RATE_LIMIT_MAX_REPLIES
+        )
+
     @staticmethod
     def _cancel_conversation(db: Session, owner_id: str, peer_id: str, reason: str):
         tasks = (
@@ -427,9 +540,11 @@ class TakeoverService:
         prompt_parts.append(event.content.strip())
         source_ids.append(event.boxim_message_id)
         prompt = "\n".join(part for part in prompt_parts if part).strip()[-MAX_PROMPT_LENGTH:]
-        due_at = event.send_time + timedelta(seconds=self.reply_delay_seconds)
+        due_at = event.send_time + timedelta(
+            seconds=_configured_reply_delay(avatar, self.reply_delay_seconds)
+        )
         task_id = secrets.token_hex(16)
-        local_id = int(time.time() * 1000) * 1000 + secrets.randbelow(1000)
+        local_id = _avatar_local_id(avatar.owner_id, event.boxim_message_id)
         db.add(
             TakeoverReplyTask(
                 id=task_id,
@@ -455,6 +570,7 @@ class TakeoverService:
                     .filter(
                         TakeoverReplyTask.status.in_(GENERATABLE_TASK_STATUSES),
                         TakeoverReplyTask.response_text == "",
+                        TakeoverReplyTask.scheduled_at <= self.now(),
                     )
                     .order_by(TakeoverReplyTask.created_at.asc())
                     .limit(10)
@@ -501,6 +617,7 @@ class TakeoverService:
                 .filter(
                     TakeoverMessage.owner_id == task.owner_id,
                     TakeoverMessage.peer_id == task.peer_id,
+                    TakeoverMessage.avatar_id == task.avatar_id,
                 )
                 .order_by(TakeoverMessage.send_time.desc())
                 .limit(30)
@@ -510,6 +627,8 @@ class TakeoverService:
             for event in reversed(events):
                 if event.boxim_message_id in excluded_ids or not event.content.strip():
                     continue
+                if event.direction == "incoming" and event.is_avatar:
+                    continue
                 history.append(
                     {
                         "role": "user" if event.direction == "incoming" else "assistant",
@@ -587,6 +706,15 @@ class TakeoverService:
                 task.cancel_reason = "stale_reply"
                 db.commit()
                 return False
+            cursor = (
+                db.query(TakeoverCursor)
+                .filter(TakeoverCursor.avatar_id == task.avatar_id)
+                .first()
+            )
+            if not cursor or not cursor.last_polled_at or cursor.last_polled_at < task.scheduled_at:
+                # Do not race the owner's final seconds of the grace period. A
+                # completed poll at/after the due time must confirm no human reply.
+                return False
             user = db.query(User).filter(User.huihui_user_id == task.owner_id).first()
             if not user or not user.huihui_token:
                 raise BoxIMError("缺少会会登录凭证", auth_error=True)

digital-avatar-app/backend/tests/test_authorizations_api.py

@@ -103,6 +103,7 @@ def test_avatar_permission_settings_default_and_persist(authorization_context):
     assert initial["data"] == {
         "avatarId": context["avatar"].id,
         "permissions": ["friend", "chat"],
+        "takeoverReplyDelaySeconds": 180,
     }
 
     updated = client.put(
@@ -115,6 +116,7 @@ def test_avatar_permission_settings_default_and_persist(authorization_context):
 
     reloaded = client.get(endpoint, headers=context["owner_headers"]).json()
     assert reloaded["data"]["permissions"] == ["friend", "publish", "interact", "takeover"]
+    assert reloaded["data"]["takeoverReplyDelaySeconds"] == 180
 
 
 def test_avatar_permission_settings_allow_all_disabled(authorization_context):
@@ -156,3 +158,57 @@ def test_avatar_permission_settings_validate_owner_and_permissions(authorization
 
     unauthenticated = client.get(endpoint)
     assert unauthenticated.status_code == 401
+
+
+def test_takeover_delay_minimum_and_single_active_avatar_per_owner(authorization_context):
+    from database import SessionLocal
+    from models import Avatar
+
+    context = authorization_context
+    endpoint = f"/api/avatar/{context['avatar'].id}/permission-settings"
+    invalid = client.put(
+        endpoint,
+        headers=context["owner_headers"],
+        json={"permissions": ["chat"], "takeoverReplyDelaySeconds": 2},
+    ).json()
+    assert invalid["code"] == 400
+
+    second_avatar_id = f"second-{context['suffix']}"
+    db = SessionLocal()
+    try:
+        db.add(
+            Avatar(
+                id=second_avatar_id,
+                owner_id=context["owner"].huihui_user_id,
+                name="第二个分身",
+                status="active",
+                config={"authorizationPermissions": ["chat", "takeover"]},
+            )
+        )
+        db.commit()
+    finally:
+        db.close()
+
+    try:
+        updated = client.put(
+            endpoint,
+            headers=context["owner_headers"],
+            json={"permissions": ["chat", "takeover"], "takeoverReplyDelaySeconds": 3},
+        ).json()
+        assert updated["code"] == 200
+        assert updated["data"]["takeoverReplyDelaySeconds"] == 3
+        assert updated["data"]["disabledAvatarIds"] == [second_avatar_id]
+
+        db = SessionLocal()
+        try:
+            second = db.query(Avatar).filter(Avatar.id == second_avatar_id).one()
+            assert "takeover" not in second.config["authorizationPermissions"]
+        finally:
+            db.close()
+    finally:
+        db = SessionLocal()
+        try:
+            db.query(Avatar).filter(Avatar.id == second_avatar_id).delete()
+            db.commit()
+        finally:
+            db.close()

digital-avatar-app/backend/tests/test_avatar_api.py

@@ -0,0 +1,93 @@
+"""Ownership and configuration-isolation tests for digital avatars."""
+
+from fastapi.testclient import TestClient
+
+from database import SessionLocal
+from main import app
+from models import Avatar
+
+
+client = TestClient(app)
+
+
+def test_avatar_detail_and_update_require_the_owner(authorization_context):
+    context = authorization_context
+    avatar_id = context["avatar"].id
+
+    assert client.get(f"/api/avatar/{avatar_id}").status_code == 401
+    assert client.get(
+        f"/api/avatar/{avatar_id}", headers=context["other_headers"]
+    ).status_code == 403
+
+    updated = client.put(
+        f"/api/avatar/{avatar_id}",
+        headers=context["owner_headers"],
+        json={
+            "description": "独立描述",
+            "config": {"replyStyle": "concise"},
+        },
+    )
+    assert updated.status_code == 200
+    assert updated.json()["data"]["description"] == "独立描述"
+
+    forbidden = client.put(
+        f"/api/avatar/{avatar_id}",
+        headers=context["other_headers"],
+        json={"description": "越权修改"},
+    )
+    assert forbidden.status_code == 403
+
+
+def test_avatar_config_updates_do_not_erase_takeover_or_knowledge_scope(authorization_context):
+    context = authorization_context
+    avatar_id = context["avatar"].id
+    db = SessionLocal()
+    try:
+        avatar = db.query(Avatar).filter(Avatar.id == avatar_id).one()
+        avatar.config = {
+            "authorizationPermissions": ["chat", "takeover"],
+            "takeoverReplyDelaySeconds": 180,
+        }
+        db.commit()
+    finally:
+        db.close()
+
+    response = client.put(
+        f"/api/avatar/{avatar_id}",
+        headers=context["owner_headers"],
+        json={"config": {"replyStyle": "warm", "creativity": 25}},
+    ).json()
+    config = response["data"]["config"]
+    assert config["replyStyle"] == "warm"
+    assert config["creativity"] == 25
+    assert config["authorizationPermissions"] == ["chat", "takeover"]
+    assert config["takeoverReplyDelaySeconds"] == 180
+
+
+def test_avatar_create_and_delete_require_login_and_ownership(authorization_context):
+    context = authorization_context
+    assert client.post("/api/avatar", json={"name": "匿名分身"}).status_code == 401
+
+    created = client.post(
+        "/api/avatar",
+        headers=context["owner_headers"],
+        json={"name": "待删除分身"},
+    )
+    assert created.status_code == 200
+    avatar_id = created.json()["data"]["id"]
+
+    try:
+        assert client.delete(
+            f"/api/avatar/{avatar_id}", headers=context["other_headers"]
+        ).status_code == 403
+        deleted = client.delete(
+            f"/api/avatar/{avatar_id}", headers=context["owner_headers"]
+        ).json()
+        assert deleted["code"] == 200
+    finally:
+        db = SessionLocal()
+        try:
+            db.query(Avatar).filter(Avatar.id == avatar_id).delete()
+            db.commit()
+        finally:
+            db.close()

digital-avatar-app/backend/tests/test_chat_orchestration.py

@@ -5,7 +5,15 @@ from unittest.mock import Mock
 from fastapi import HTTPException
 
 from models import Avatar, User
-from routers.chat import _build_prompt, _iter_text_chunks, _match_standard_qa, _public_avatar_payload, _require_owned_avatar, _resolve_reply
+from routers.chat import (
+    _build_prompt,
+    _iter_text_chunks,
+    _match_standard_qa,
+    _public_avatar_payload,
+    _qa_requires_language_adaptation,
+    _require_owned_avatar,
+    _resolve_reply,
+)
 
 
 class ChatOrchestrationTests(unittest.TestCase):
@@ -50,6 +58,34 @@ class ChatOrchestrationTests(unittest.TestCase):
         self.assertEqual(result["answer"], "标准地址")
         fake_model.assert_not_called()
 
+    def test_cross_language_qa_is_faithfully_adapted_by_model(self):
+        fake_model = Mock(return_value="Our address is Test Road 1.")
+        fake_search = Mock(return_value=[])
+        result = _resolve_reply(
+            None,
+            self.avatar,
+            "Where is your office?",
+            [],
+            qa_pairs=[SimpleNamespace(question="Where is your office?", answer="地址是测试路1号。", enabled=True)],
+            search_fn=fake_search,
+            model_client=fake_model,
+        )
+
+        self.assertEqual(result["source"], "qa")
+        self.assertEqual(result["answer"], "Our address is Test Road 1.")
+        self.assertEqual(fake_model.call_args.kwargs["temperature"], 0.0)
+        system = fake_model.call_args.kwargs["messages"][0]["content"]
+        self.assertIn("已确认标准答案", system)
+        self.assertIn("地址是测试路1号", system)
+        self.assertIn("只使用该语言回答", system)
+        fake_search.assert_not_called()
+
+    def test_qa_language_adaptation_detects_common_writing_system_changes(self):
+        self.assertTrue(_qa_requires_language_adaptation("Hello", "你好"))
+        self.assertTrue(_qa_requires_language_adaptation("こんにちは", "你好"))
+        self.assertTrue(_qa_requires_language_adaptation("안녕하세요", "你好"))
+        self.assertFalse(_qa_requires_language_adaptation("你好", "您好"))
+
     def test_conversational_paraphrase_matches_standard_qa(self):
         for question in ("请问一下，你们公司在哪里呀？", "请问去你们那边怎么走"):
             with self.subTest(question=question):
@@ -106,6 +142,9 @@ class ChatOrchestrationTests(unittest.TestCase):
         self.assertIn("像熟人之间微信聊天一样", messages[0]["content"])
         self.assertIn("不隶属于任何机构", messages[0]["content"])
         self.assertIn("不要连续输出空行", messages[0]["content"])
+        self.assertIn("回答语言规则", messages[0]["content"])
+        self.assertIn("当前最后一条用户消息", messages[0]["content"])
+        self.assertIn("历史消息", messages[0]["content"])
 
     def test_prompt_blocks_ungrounded_factual_answers(self):
         messages = _build_prompt(self.avatar, [], "聊聊国际新闻", [])
@@ -113,6 +152,8 @@ class ChatOrchestrationTests(unittest.TestCase):
         self.assertIn("没有检索到可靠资料", system)
         self.assertIn("不要凭通用知识", system)
         self.assertIn("不要提及知识库", system)
+        self.assertIn("不得推断服务对象", system)
+        self.assertIn("工作场所", system)
 
     def test_public_avatar_payload_excludes_internal_configuration(self):
         payload = _public_avatar_payload(self.avatar)

digital-avatar-app/backend/tests/test_knowledge_storage.py

@@ -6,7 +6,7 @@ from fastapi.testclient import TestClient
 
 from database import SessionLocal
 from main import app
-from models import KnowledgeChunk, KnowledgeDoc
+from models import Avatar, KnowledgeChunk, KnowledgeDoc, QAPair
 from routers.knowledge import _doc_payload
 
 
@@ -92,3 +92,94 @@ def test_markdown_upload_commits_ready_document_and_chunks_together(
         db.commit()
     finally:
         db.close()
+
+
+def test_each_avatar_has_an_independent_document_and_qa_scope(authorization_context):
+    context = authorization_context
+    first_avatar_id = context["avatar"].id
+    second_avatar_id = f"knowledge-second-{context['suffix']}"
+    first_doc_id = f"knowledge-first-doc-{context['suffix']}"
+    second_doc_id = f"knowledge-second-doc-{context['suffix']}"
+    first_qa_id = f"knowledge-first-qa-{context['suffix']}"
+    second_qa_id = f"knowledge-second-qa-{context['suffix']}"
+
+    db = SessionLocal()
+    try:
+        db.add_all(
+            [
+                Avatar(
+                    id=second_avatar_id,
+                    owner_id=context["owner"].huihui_user_id,
+                    name="独立知识库分身",
+                    status="active",
+                    config={},
+                ),
+                KnowledgeDoc(
+                    id=first_doc_id,
+                    avatar_id=first_avatar_id,
+                    filename="first.md",
+                    status="ready",
+                    vectorized=True,
+                ),
+                KnowledgeDoc(
+                    id=second_doc_id,
+                    avatar_id=second_avatar_id,
+                    filename="second.md",
+                    status="ready",
+                    vectorized=True,
+                ),
+                QAPair(
+                    id=first_qa_id,
+                    avatar_id=first_avatar_id,
+                    question="第一个分身问题",
+                    answer="第一个分身答案",
+                ),
+                QAPair(
+                    id=second_qa_id,
+                    avatar_id=second_avatar_id,
+                    question="第二个分身问题",
+                    answer="第二个分身答案",
+                ),
+            ]
+        )
+        db.commit()
+    finally:
+        db.close()
+
+    try:
+        first_docs = client.get(
+            f"/api/avatar/{first_avatar_id}/knowledge/docs",
+            headers=context["owner_headers"],
+        ).json()["data"]
+        second_docs = client.get(
+            f"/api/avatar/{second_avatar_id}/knowledge/docs",
+            headers=context["owner_headers"],
+        ).json()["data"]
+        first_qa = client.get(
+            f"/api/avatar/{first_avatar_id}/knowledge/qa",
+            headers=context["owner_headers"],
+        ).json()["data"]
+        second_qa = client.get(
+            f"/api/avatar/{second_avatar_id}/knowledge/qa",
+            headers=context["owner_headers"],
+        ).json()["data"]
+
+        assert [item["id"] for item in first_docs if item["id"] == first_doc_id] == [first_doc_id]
+        assert second_doc_id not in {item["id"] for item in first_docs}
+        assert [item["id"] for item in second_docs] == [second_doc_id]
+        assert first_qa_id in {item["id"] for item in first_qa}
+        assert second_qa_id not in {item["id"] for item in first_qa}
+        assert [item["id"] for item in second_qa] == [second_qa_id]
+    finally:
+        db = SessionLocal()
+        try:
+            db.query(QAPair).filter(QAPair.id.in_([first_qa_id, second_qa_id])).delete(
+                synchronize_session=False
+            )
+            db.query(KnowledgeDoc).filter(
+                KnowledgeDoc.id.in_([first_doc_id, second_doc_id])
+            ).delete(synchronize_session=False)
+            db.query(Avatar).filter(Avatar.id == second_avatar_id).delete()
+            db.commit()
+        finally:
+            db.close()

digital-avatar-app/backend/tests/test_takeover_model.py

@@ -13,7 +13,7 @@ def test_authorization_takeover_fields():
         assert hasattr(auth, 'takeover_delay_seconds')
         assert auth.takeover_enabled == False
         assert auth.takeover_mode == 'immediate'
-        assert auth.takeover_delay_seconds == 30
+        assert auth.takeover_delay_seconds == 180
     finally:
         db.close()
 

digital-avatar-app/backend/tests/test_takeover_service.py

@@ -11,7 +11,12 @@ from sqlalchemy.orm import sessionmaker
 from database import Base
 from models import Avatar, TakeoverCursor, TakeoverMessage, TakeoverReplyTask, User
 from services.boxim_client import BoxIMError
-from services.takeover_service import TakeoverService, _plain_text_reply
+from services.takeover_service import (
+    AVATAR_LOCAL_ID_PREFIX,
+    TakeoverService,
+    _avatar_local_id,
+    _plain_text_reply,
+)
 
 
 class Clock:
@@ -77,7 +82,10 @@ def service_context(tmp_path):
         owner_id=user.huihui_user_id,
         name="分身",
         status="active",
-        config={"authorizationPermissions": ["chat", "takeover"]},
+        config={
+            "authorizationPermissions": ["chat", "takeover"],
+            "takeoverReplyDelaySeconds": 3,
+        },
     )
     db.add_all([user, avatar])
     db.commit()
@@ -120,7 +128,6 @@ async def test_incoming_message_is_prepared_then_sent_at_three_seconds(service_c
         {"id": 11, "localId": 2, "sendId": 200, "recvId": 100, "sendTime": clock.millis(), "type": 0, "content": "你好"}
     )
 
-    with patch("routers.chat._resolve_reply", return_value={"answer": "**你好**\n\n很高兴见到你"}):
     await service.poll_and_process_messages()
     assert boxim.sent == []
     assert boxim.read_receipts == [{"friendId": "200", "messageId": "11"}]
@@ -130,6 +137,7 @@ async def test_incoming_message_is_prepared_then_sent_at_three_seconds(service_c
     assert boxim.sent == []
 
     clock.advance(1)
+    with patch("routers.chat._resolve_reply", return_value={"answer": "**你好**\n\n很高兴见到你"}):
         await service.poll_and_process_messages()
     assert boxim.sent == [{"peerId": "200", "content": "你好\n很高兴见到你", "localId": boxim.sent[0]["localId"]}]
 
@@ -142,6 +150,131 @@ async def test_incoming_message_is_prepared_then_sent_at_three_seconds(service_c
         db.close()
 
 
+@pytest.mark.asyncio
+async def test_default_reply_delay_is_three_minutes(service_context):
+    session_factory, service, boxim, clock = service_context
+    db = session_factory()
+    try:
+        avatar = db.query(Avatar).one()
+        avatar.config = {"authorizationPermissions": ["chat", "takeover"]}
+        db.commit()
+    finally:
+        db.close()
+
+    await service.poll_and_process_messages()
+    boxim.messages.append(
+        {"id": 12, "localId": 12, "sendId": 200, "recvId": 100, "sendTime": clock.millis(), "type": 0, "content": "三分钟后回复"}
+    )
+    await service.poll_and_process_messages()
+
+    db = session_factory()
+    try:
+        task = db.query(TakeoverReplyTask).one()
+        assert task.scheduled_at == clock.now() + timedelta(seconds=180)
+    finally:
+        db.close()
+
+    clock.advance(179)
+    await service.process_reply_tasks()
+    assert boxim.sent == []
+    clock.advance(1)
+    with patch("routers.chat._resolve_reply", return_value={"answer": "好的"}):
+        await service.poll_and_process_messages()
+    assert [item["content"] for item in boxim.sent] == ["好的"]
+
+
+@pytest.mark.asyncio
+async def test_avatar_origin_message_never_schedules_a_reply(service_context):
+    session_factory, service, boxim, clock = service_context
+    await service.poll_and_process_messages()
+    local_id = _avatar_local_id("peer-owner", "peer-trigger")
+    boxim.messages.append(
+        {"id": 15, "localId": local_id, "sendId": 200, "recvId": 100, "sendTime": clock.millis(), "type": 0, "content": "另一端分身回复"}
+    )
+
+    with patch("routers.chat._resolve_reply") as resolver:
+        await service.poll_and_process_messages()
+
+    resolver.assert_not_called()
+    db = session_factory()
+    try:
+        event = db.query(TakeoverMessage).filter(TakeoverMessage.boxim_message_id == "15").one()
+        assert event.is_avatar is True
+        assert db.query(TakeoverReplyTask).count() == 0
+    finally:
+        db.close()
+
+
+@pytest.mark.asyncio
+async def test_peer_avatar_messages_are_excluded_from_later_human_context(service_context):
+    _session_factory, service, boxim, clock = service_context
+    await service.poll_and_process_messages()
+    boxim.messages.append(
+        {
+            "id": 16,
+            "localId": _avatar_local_id("peer-owner", "peer-trigger"),
+            "sendId": 200,
+            "recvId": 100,
+            "sendTime": clock.millis(),
+            "type": 0,
+            "content": "分身生成的夸张长文",
+        }
+    )
+    await service.poll_and_process_messages()
+
+    clock.advance(1)
+    boxim.messages.append(
+        {
+            "id": 17,
+            "localId": 17,
+            "sendId": 200,
+            "recvId": 100,
+            "sendTime": clock.millis(),
+            "type": 0,
+            "content": "真人的新问题",
+        }
+    )
+    await service.poll_and_process_messages()
+    clock.advance(3)
+    with patch("routers.chat._resolve_reply", return_value={"answer": "正常回复"}) as resolver:
+        await service.poll_and_process_messages()
+
+    assert resolver.call_args.args[3] == []
+
+
+@pytest.mark.asyncio
+async def test_owner_message_pauses_future_takeover_for_ten_minutes(service_context):
+    session_factory, service, boxim, clock = service_context
+    await service.poll_and_process_messages()
+    boxim.messages.append(
+        {"id": 18, "localId": 18, "sendId": 100, "recvId": 200, "sendTime": clock.millis(), "type": 0, "content": "我先来回复"}
+    )
+    await service.poll_and_process_messages()
+
+    clock.advance(30)
+    boxim.messages.append(
+        {"id": 19, "localId": 19, "sendId": 200, "recvId": 100, "sendTime": clock.millis(), "type": 0, "content": "收到"}
+    )
+    with patch("routers.chat._resolve_reply") as resolver:
+        await service.poll_and_process_messages()
+
+    resolver.assert_not_called()
+    db = session_factory()
+    try:
+        assert db.query(TakeoverReplyTask).count() == 0
+    finally:
+        db.close()
+
+
+def test_avatar_local_id_is_deterministic_and_self_describing():
+    first = _avatar_local_id("owner", "message-1")
+    assert first == _avatar_local_id("owner", "message-1")
+    assert first != _avatar_local_id("owner", "message-2")
+    assert first.startswith(AVATAR_LOCAL_ID_PREFIX)
+    assert len(first) == 18
+    assert first.isdigit()
+
+
 @pytest.mark.asyncio
 async def test_different_contacts_generate_without_blocking_each_other(service_context):
     session_factory, service, boxim, clock = service_context
@@ -158,11 +291,11 @@ async def test_different_contacts_generate_without_blocking_each_other(service_c
         both_generating.wait()
         return {"answer": f"回复{prompt[-1]}"}
 
-    with patch("routers.chat._resolve_reply", side_effect=resolve):
     await service.poll_and_process_messages()
 
     clock.advance(3)
-    await service.process_reply_tasks()
+    with patch("routers.chat._resolve_reply", side_effect=resolve):
+        await service.poll_and_process_messages()
     assert {(item["peerId"], item["content"]) for item in boxim.sent} == {
         ("200", "回复甲"),
         ("300", "回复乙"),
@@ -237,6 +370,34 @@ async def test_owner_message_cancels_pending_reply(service_context):
         db.close()
 
 
+@pytest.mark.asyncio
+async def test_owner_message_in_final_second_wins_before_generation(service_context):
+    session_factory, service, boxim, clock = service_context
+    await service.poll_and_process_messages()
+    boxim.messages.append(
+        {"id": 23, "localId": 23, "sendId": 200, "recvId": 100, "sendTime": clock.millis(), "type": 0, "content": "还在吗"}
+    )
+    await service.poll_and_process_messages()
+
+    clock.advance(2)
+    boxim.messages.append(
+        {"id": 24, "localId": 24, "sendId": 100, "recvId": 200, "sendTime": clock.millis(), "type": 0, "content": "我来处理"}
+    )
+    clock.advance(1)
+    with patch("routers.chat._resolve_reply") as resolver:
+        await service.poll_and_process_messages()
+
+    resolver.assert_not_called()
+    assert boxim.sent == []
+    db = session_factory()
+    try:
+        task = db.query(TakeoverReplyTask).filter(TakeoverReplyTask.trigger_message_id == "23").one()
+        assert task.status == "cancelled"
+        assert task.cancel_reason == "owner_replied"
+    finally:
+        db.close()
+
+
 @pytest.mark.asyncio
 async def test_quick_successive_messages_are_coalesced_into_one_reply(service_context):
     session_factory, service, boxim, clock = service_context
@@ -244,19 +405,18 @@ async def test_quick_successive_messages_are_coalesced_into_one_reply(service_co
     boxim.messages.append(
         {"id": 31, "localId": 5, "sendId": 200, "recvId": 100, "sendTime": clock.millis(), "type": 0, "content": "第一句"}
     )
-    with patch("routers.chat._resolve_reply", return_value={"answer": "第一版"}):
     await service.poll_and_process_messages()
 
     clock.advance(1)
     boxim.messages.append(
         {"id": 32, "localId": 6, "sendId": 200, "recvId": 100, "sendTime": clock.millis(), "type": 0, "content": "第二句"}
     )
+    await service.poll_and_process_messages()
+
+    clock.advance(3)
     with patch("routers.chat._resolve_reply", return_value={"answer": "合并回复"}) as resolver:
         await service.poll_and_process_messages()
     assert resolver.call_args.args[2] == "第一句\n第二句"
-
-    clock.advance(3)
-    await service.poll_and_process_messages()
     assert [item["content"] for item in boxim.sent] == ["合并回复"]
 
     db = session_factory()
@@ -291,5 +451,41 @@ async def test_connection_failure_disables_takeover_and_stops_retrying(service_c
     boxim.exchange_access_token.assert_awaited_once_with("prod-huihui-token")
 
 
+@pytest.mark.asyncio
+async def test_transient_connection_failure_keeps_takeover_and_recovers(service_context):
+    session_factory, service, boxim, _ = service_context
+    boxim.exchange_access_token = AsyncMock(
+        side_effect=[
+            BoxIMError("连接超时"),
+            {"accessToken": "box-token", "accessTokenExpiresIn": 3600},
+        ]
+    )
+
+    await service.poll_messages()
+
+    db = session_factory()
+    try:
+        avatar = db.query(Avatar).one()
+        cursor = db.query(TakeoverCursor).one()
+        assert "takeover" in avatar.config["authorizationPermissions"]
+        assert cursor.initialized is False
+        assert "暂时连接失败" in cursor.last_error
+    finally:
+        db.close()
+
+    await service.poll_messages()
+
+    db = session_factory()
+    try:
+        avatar = db.query(Avatar).one()
+        cursor = db.query(TakeoverCursor).one()
+        assert "takeover" in avatar.config["authorizationPermissions"]
+        assert cursor.initialized is True
+        assert cursor.last_error == ""
+    finally:
+        db.close()
+    assert boxim.exchange_access_token.await_count == 2
+
+
 def test_plain_text_reply_removes_markdown_and_empty_lines():
     assert _plain_text_reply("## 建议\n\n**不能自行用药**\n`必要时就医`") == "建议\n不能自行用药\n必要时就医"

digital-avatar-app/docs/H5_PRODUCTION_DEPLOYMENT.md

@@ -112,7 +112,7 @@ location /api/ {
 4. A、B 两个会会用户分别进入时只能看到各自的数字分身与知识库，不会继承上一用户缓存。
 5. 使用过期或伪造 token 时进入登录页并显示凭证失效，不得继续访问旧用户数据。
 6. 分身聊天 SSE 逐段输出正常，Markdown 正常渲染，知识库优先级和积分扣费正常。
-7. 开启 BOXIM 主动接管后保持在线，收到消息、三秒回复、已读回执和主人发言暂停均正常。
+7. 开启 BOXIM 主动接管后保持在线，默认三分钟回复、自定义等待时间、已读回执、分身防回环和主人发言暂停均正常。
 8. 重建容器后数据库、头像、知识库文档仍存在，`/api/health` 返回成功。
 9. `https://digital.99hui.com/api/health` 可访问，证书域名和有效期正确，HTTP 自动跳转 HTTPS。
 10. 微信和支付宝各创建一笔最小套餐订单，未付款时积分不变；支付成功后回调到账一次，重复回调积分不重复增加。

digital-avatar-app/src/api/index.ts

@@ -191,19 +191,28 @@ export type AvatarPermission = 'friend' | 'chat' | 'publish' | 'browse' | 'inter
 export interface AvatarPermissionSettings {
   avatarId: string
   permissions: AvatarPermission[]
+  takeoverReplyDelaySeconds: number
+  disabledAvatarIds?: string[]
 }
 
 export const getAvatarPermissionSettings = (avatarId: string) =>
   request.get<AvatarPermissionSettings>(`/avatar/${avatarId}/permission-settings`)
 
-export const updateAvatarPermissionSettings = (avatarId: string, permissions: AvatarPermission[]) =>
+export const updateAvatarPermissionSettings = (
-  request.put<AvatarPermissionSettings>(`/avatar/${avatarId}/permission-settings`, { permissions })
+  avatarId: string,
+  permissions: AvatarPermission[],
+  takeoverReplyDelaySeconds: number
+) => request.put<AvatarPermissionSettings>(`/avatar/${avatarId}/permission-settings`, {
+  permissions,
+  takeoverReplyDelaySeconds,
+})
 
 export interface TakeoverStatus {
   enabled: boolean
   status: 'disabled' | 'connecting' | 'ready' | 'needs_login' | 'error'
   message: string
   pendingCount: number
+  takeoverReplyDelaySeconds: number
   lastPolledAt: string | null
 }
 

digital-avatar-app/src/views/AuthorizationManage.vue

@@ -64,7 +64,7 @@
             <span class="permission-copy">
               <strong>{{ item.title }}</strong>
               <small>
-                {{ item.description }}
+                {{ item.key === 'takeover' ? takeoverDescription : item.description }}
                 <span
                   v-if="item.key === 'takeover' && takeoverConnectionLabel"
                   class="connection-state"
@@ -79,6 +79,33 @@
           </button>
         </section>
 
+        <section v-if="permissionState.takeover" class="takeover-delay-card" aria-label="自动回复等待时间">
+          <div class="delay-heading">
+            <div>
+              <strong>自动回复等待时间</strong>
+              <small>等待期间主人发言会取消本次回复，最短 3 秒</small>
+            </div>
+            <span>{{ formattedTakeoverDelay }}</span>
+          </div>
+          <div class="delay-control">
+            <input
+              v-model.number="takeoverDelayValue"
+              type="number"
+              inputmode="numeric"
+              step="1"
+              :min="takeoverDelayUnit === 'minutes' ? 1 : 3"
+              :max="takeoverDelayUnit === 'minutes' ? 1440 : 86400"
+              aria-label="等待时间"
+              :disabled="loading || saving"
+              @blur="normalizeTakeoverDelay"
+            />
+            <select v-model="takeoverDelayUnit" aria-label="等待时间单位" :disabled="loading || saving">
+              <option value="seconds">秒</option>
+              <option value="minutes">分钟</option>
+            </select>
+          </div>
+        </section>
+
         <p v-if="errorMessage" class="error-message" role="alert">{{ errorMessage }}</p>
       </template>
 
@@ -171,7 +198,7 @@ const permissionItems: Array<{
   {
     key: 'takeover',
     title: '分身主动接管聊天回复',
-    description: '收到私聊消息 3 秒后回复，主人发言时暂停',
+    description: '收到私聊消息后按设定时间回复，主人发言时暂停',
     tone: 'cyan',
   },
 ]
@@ -190,6 +217,8 @@ const saving = ref(false)
 const errorMessage = ref('')
 const toastMessage = ref('')
 const takeoverStatus = ref<TakeoverStatus | null>(null)
+const takeoverDelayValue = ref(3)
+const takeoverDelayUnit = ref<'seconds' | 'minutes'>('minutes')
 let toastTimer: number | undefined
 let takeoverStatusTimer: number | undefined
 
@@ -210,6 +239,38 @@ const takeoverConnectionTone = computed(() => {
   return 'connecting'
 })
 
+const takeoverDelaySeconds = computed(() => {
+  const value = Math.trunc(Number(takeoverDelayValue.value) || 0)
+  return takeoverDelayUnit.value === 'minutes' ? value * 60 : value
+})
+
+const formattedTakeoverDelay = computed(() => {
+  const seconds = takeoverDelaySeconds.value
+  if (seconds > 0 && seconds % 60 === 0) return `${seconds / 60} 分钟`
+  return `${seconds} 秒`
+})
+
+const takeoverDescription = computed(() =>
+  `收到私聊消息 ${formattedTakeoverDelay.value}后回复，主人发言时暂停`
+)
+
+const applyTakeoverDelay = (seconds: number) => {
+  const normalized = Number.isFinite(seconds) && seconds >= 3 ? Math.trunc(seconds) : 180
+  if (normalized % 60 === 0) {
+    takeoverDelayUnit.value = 'minutes'
+    takeoverDelayValue.value = normalized / 60
+  } else {
+    takeoverDelayUnit.value = 'seconds'
+    takeoverDelayValue.value = normalized
+  }
+}
+
+const normalizeTakeoverDelay = () => {
+  const min = takeoverDelayUnit.value === 'minutes' ? 1 : 3
+  const max = takeoverDelayUnit.value === 'minutes' ? 1440 : 86400
+  takeoverDelayValue.value = Math.min(max, Math.max(min, Math.trunc(Number(takeoverDelayValue.value) || min)))
+}
+
 const setPermissions = (permissions: AvatarPermission[]) => {
   const enabled = new Set(permissions)
   for (const item of permissionItems) permissionState[item.key] = enabled.has(item.key)
@@ -265,6 +326,7 @@ const loadSettings = async () => {
   try {
     const settings = await getAvatarPermissionSettings(activeAvatarId.value)
     setPermissions(settings.permissions || [])
+    applyTakeoverDelay(settings.takeoverReplyDelaySeconds || 180)
     await loadTakeoverStatus()
     scheduleTakeoverStatusRefresh()
   } catch (error: any) {
@@ -291,8 +353,18 @@ const saveSettings = async (takeoverToggle = false): Promise<boolean> => {
   saving.value = true
   errorMessage.value = ''
   try {
-    const settings = await updateAvatarPermissionSettings(activeAvatarId.value, selectedPermissions())
+    normalizeTakeoverDelay()
+    if (takeoverDelaySeconds.value < 3 || takeoverDelaySeconds.value > 86400) {
+      errorMessage.value = '自动回复等待时间需在 3 秒到 24 小时之间'
+      return false
+    }
+    const settings = await updateAvatarPermissionSettings(
+      activeAvatarId.value,
+      selectedPermissions(),
+      takeoverDelaySeconds.value,
+    )
     setPermissions(settings.permissions || [])
+    applyTakeoverDelay(settings.takeoverReplyDelaySeconds || 180)
     await loadTakeoverStatus()
     scheduleTakeoverStatusRefresh()
     if (takeoverToggle) {
@@ -468,6 +540,75 @@ svg {
   min-height: 76px;
 }
 
+.takeover-delay-card {
+  margin-top: 12px;
+  padding: 16px;
+  border: 1px solid #dff1ef;
+  border-radius: 15px;
+  background: linear-gradient(135deg, #f5fcfb 0%, #fff 100%);
+  box-shadow: 0 8px 24px rgba(53, 166, 162, .06);
+}
+
+.delay-heading {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 12px;
+}
+
+.delay-heading strong,
+.delay-heading small {
+  display: block;
+}
+
+.delay-heading strong {
+  font-size: 14px;
+  line-height: 1.4;
+}
+
+.delay-heading small {
+  margin-top: 5px;
+  color: #8c929f;
+  font-size: 11px;
+  line-height: 1.55;
+}
+
+.delay-heading > span {
+  flex: none;
+  padding: 4px 8px;
+  border-radius: 999px;
+  color: #258e8a;
+  background: #e8f8f6;
+  font-size: 11px;
+  font-weight: 700;
+}
+
+.delay-control {
+  margin-top: 14px;
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) 88px;
+  gap: 10px;
+}
+
+.delay-control input,
+.delay-control select {
+  min-width: 0;
+  height: 42px;
+  padding: 0 12px;
+  border: 1px solid #dfe5e8;
+  border-radius: 11px;
+  outline: none;
+  color: #222528;
+  background: #fff;
+  font: inherit;
+}
+
+.delay-control input:focus,
+.delay-control select:focus {
+  border-color: #35a6a2;
+  box-shadow: 0 0 0 3px rgba(53, 166, 162, .1);
+}
+
 .permission-icon {
   width: 34px;
   height: 34px;