diff --git a/backend/app/api/knowledge.py b/backend/app/api/knowledge.py
index 907059d5..c936ea9c 100644
--- a/backend/app/api/knowledge.py
+++ b/backend/app/api/knowledge.py
@@ -15,6 +15,7 @@ from typing import Optional
 
 from app.database import get_db
 from app.auth_middleware import require_role
+from app.deps import get_entity_id
 from app.models import KnowledgeEvent, KnowledgeSummary
 from app.services.knowledge_service import (
     generate_summary_sync,
@@ -59,18 +60,22 @@ def list_summaries(
     limit: int = 20,
     offset: int = 0,
     db: Session = Depends(get_db),
+    entity_id: int = Depends(get_entity_id),
 ):
-    """获取摘要列表，按层级筛选，按时间倒序"""
+    """获取摘要列表，按层级筛选，按时间倒序（按企业抽屉隔离）"""
     query = db.query(KnowledgeSummary)
+    query = query.filter(KnowledgeSummary.entity_id == entity_id)
     if level:
         query = query.filter(KnowledgeSummary.level == level)
     query = query.order_by(desc(KnowledgeSummary.id)).offset(offset).limit(limit)
     total = db.query(func.count(KnowledgeSummary.id)).select_from(KnowledgeSummary)
+    total = total.filter(KnowledgeSummary.entity_id == entity_id)
     if level:
         total = total.filter(KnowledgeSummary.level == level)
     total = total.scalar()
     return {
         "total": total,
+        "entity_id": entity_id,
         "items": [summary_to_dict(s) for s in query.all()],
     }
 
@@ -79,18 +84,30 @@ def list_summaries(
 def latest_summary(
     level: str = Query("daily", description="层级: daily/weekly/monthly/cumulative"),
     db: Session = Depends(get_db),
+    entity_id: int = Depends(get_entity_id),
 ):
-    """获取指定层级的最新摘要"""
-    s = get_last_summary(db, level)
+    """获取指定层级的最新摘要（按企业隔离）"""
+    s = get_last_summary(db, level, entity_id)
     if not s:
         return {"detail": f"没有{level}层级的摘要"}, 404
     return summary_to_dict(s)
 
 
 @router.get("/summaries/{summary_id}")
-def get_summary(summary_id: int, db: Session = Depends(get_db)):
-    """获取单条摘要详情"""
-    s = db.query(KnowledgeSummary).filter(KnowledgeSummary.id == summary_id).first()
+def get_summary(
+    summary_id: int,
+    db: Session = Depends(get_db),
+    entity_id: int = Depends(get_entity_id),
+):
+    """获取单条摘要详情（仅本企业，防跨企业探测）"""
+    s = (
+        db.query(KnowledgeSummary)
+        .filter(
+            KnowledgeSummary.id == summary_id,
+            KnowledgeSummary.entity_id == entity_id,
+        )
+        .first()
+    )
     if not s:
         raise HTTPException(status_code=404, detail="摘要不存在")
     return summary_to_dict(s)
@@ -105,8 +122,9 @@ def list_events(
     until: Optional[str] = None,
     limit: int = 50,
     db: Session = Depends(get_db),
+    entity_id: int = Depends(get_entity_id),
 ):
-    """查询未摘要的原始事件
+    """查询未摘要的原始事件（按企业隔离）
 
     如果不传时间，默认返回最近7天的操作记录和预警。
     """
@@ -116,18 +134,21 @@ def list_events(
     except ValueError:
         raise HTTPException(status_code=400, detail="时间格式错误，请使用 ISO 格式如 2026-06-01T00:00:00")
 
-    events = extract_events(db, dt_since, dt_until)
-    return {"since": dt_since.isoformat(), "until": dt_until.isoformat(), "total": len(events), "events": events[:limit]}
+    events = extract_events(db, dt_since, dt_until, entity_id=entity_id)
+    return {"since": dt_since.isoformat(), "until": dt_until.isoformat(), "entity_id": entity_id, "total": len(events), "events": events[:limit]}
 
 
 # ── 手动触发 ──
 
 
 @router.post("/generate/daily")
-def trigger_daily_summary(db: Session = Depends(get_db)):
-    """手动触发每日摘要生成"""
+def trigger_daily_summary(
+    db: Session = Depends(get_db),
+    entity_id: int = Depends(get_entity_id),
+):
+    """手动触发每日摘要生成（写入当前企业抽屉）"""
     try:
-        result = generate_daily_sync(db)
+        result = generate_daily_sync(db, entity_id=entity_id)
         return {"message": "每日摘要已生成", "summary": result}
     except Exception as e:
         logger.exception("每日摘要生成失败")
@@ -135,10 +156,13 @@ def trigger_daily_summary(db: Session = Depends(get_db)):
 
 
 @router.post("/generate/weekly")
-def trigger_weekly_summary(db: Session = Depends(get_db)):
-    """手动触发周度摘要生成"""
+def trigger_weekly_summary(
+    db: Session = Depends(get_db),
+    entity_id: int = Depends(get_entity_id),
+):
+    """手动触发周度摘要生成（写入当前企业抽屉）"""
     try:
-        result = generate_weekly_sync(db)
+        result = generate_weekly_sync(db, entity_id=entity_id)
         return {"message": "周度摘要已生成", "summary": result}
     except Exception as e:
         logger.exception("周度摘要生成失败")
@@ -146,10 +170,13 @@ def trigger_weekly_summary(db: Session = Depends(get_db)):
 
 
 @router.post("/generate/monthly")
-def trigger_monthly_summary(db: Session = Depends(get_db)):
-    """手动触发月度摘要生成"""
+def trigger_monthly_summary(
+    db: Session = Depends(get_db),
+    entity_id: int = Depends(get_entity_id),
+):
+    """手动触发月度摘要生成（写入当前企业抽屉）"""
     try:
-        result = generate_monthly_sync(db)
+        result = generate_monthly_sync(db, entity_id=entity_id)
         return {"message": "月度摘要已生成", "summary": result}
     except Exception as e:
         logger.exception("月度摘要生成失败")
diff --git a/backend/app/api/knowledge_articles.py b/backend/app/api/knowledge_articles.py
index afcd1adf..fa783f5d 100644
--- a/backend/app/api/knowledge_articles.py
+++ b/backend/app/api/knowledge_articles.py
@@ -4,9 +4,11 @@
 """
 from fastapi import APIRouter, Depends, HTTPException, Query
 from sqlalchemy.orm import Session
+from sqlalchemy import or_
 from typing import Optional
 from app.database import get_db
 from app.auth_middleware import require_role
+from app.deps import get_entity_id
 from app.models.knowledge_article import KnowledgeArticle
 
 router = APIRouter(prefix="/api/cma/knowledge-articles", tags=["知识库嵌入"],
@@ -17,6 +19,7 @@ router = APIRouter(prefix="/api/cma/knowledge-articles", tags=["知识库嵌入"
 def article_to_dict(a: KnowledgeArticle) -> dict:
     return {
         "id": a.id,
+        "entity_id": a.entity_id,
         "title": a.title,
         "summary": a.summary,
         "content": a.content,
@@ -32,9 +35,21 @@ def list_articles(
     related_page: Optional[str] = Query(None, description="按关联页面路由筛选"),
     category: Optional[str] = Query(None),
     db: Session = Depends(get_db),
+    entity_id: int = Depends(get_entity_id),
 ):
-    """查询知识文章，可按关联页面或分类筛选"""
-    q = db.query(KnowledgeArticle)
+    """查询知识文章（本企业专属 ∪ 全局共享），可按关联页面或分类筛选
+
+    隔离语义（2026-09-03 多租户分区）：
+    - entity_id IS NULL → 全局共享（CMA 系统教学知识，所有企业可见）
+    - entity_id == 当前账套 → 企业专属（只本企业可见）
+    - 其他企业的专属文章不可见
+    """
+    q = db.query(KnowledgeArticle).filter(
+        or_(
+            KnowledgeArticle.entity_id == entity_id,
+            KnowledgeArticle.entity_id.is_(None),
+        )
+    )
     if related_page:
         q = q.filter(KnowledgeArticle.related_page.contains(related_page))
     if category:
@@ -44,8 +59,19 @@ def list_articles(
 
 
 @router.get("/{article_id}")
-def get_article(article_id: int, db: Session = Depends(get_db)):
-    a = db.query(KnowledgeArticle).filter(KnowledgeArticle.id == article_id).first()
+def get_article(
+    article_id: int,
+    db: Session = Depends(get_db),
+    entity_id: int = Depends(get_entity_id),
+):
+    """获取文章详情（企业专属文章仅本企业可见，防跨企业探测）"""
+    a = (
+        db.query(KnowledgeArticle)
+        .filter(KnowledgeArticle.id == article_id)
+        .first()
+    )
     if not a:
         raise HTTPException(404, "文章不存在")
+    if a.entity_id is not None and a.entity_id != entity_id:
+        raise HTTPException(404, "文章不存在")
     return article_to_dict(a)
diff --git a/backend/app/models/knowledge.py b/backend/app/models/knowledge.py
index 71f95427..e001584e 100644
--- a/backend/app/models/knowledge.py
+++ b/backend/app/models/knowledge.py
@@ -22,6 +22,7 @@ class KnowledgeEvent(Base):
     __tablename__ = "knowledge_events"
 
     id = Column(Integer, primary_key=True, index=True)
+    entity_id = Column(Integer, default=1, index=True, comment="企业ID (多租户隔离 2026-09-03)")
     event_type = Column(String(30), nullable=False, comment="事件类型: kpi_change/alert/decision/plan/map/import/user_action")
     event_level = Column(String(20), default="info", comment="info/warning/important/critical")
     source = Column(String(50), nullable=True, comment="来源: operation_log/api/erp_sync/manual")
@@ -47,6 +48,7 @@ class KnowledgeSummary(Base):
     __tablename__ = "knowledge_summaries"
 
     id = Column(Integer, primary_key=True, index=True)
+    entity_id = Column(Integer, default=1, index=True, comment="企业ID (多租户隔离 2026-09-03)")
     level = Column(String(20), nullable=False, comment="摘要层级: daily/weekly/monthly/cumulative")
     period_key = Column(String(20), nullable=False, comment="期间标识: 2026-06-12 / 2026-W24 / 2026-06 / cumulative")
     title = Column(String(300), nullable=False, comment="摘要标题")
diff --git a/backend/app/models/knowledge_article.py b/backend/app/models/knowledge_article.py
index 324d61f9..ab91d73c 100644
--- a/backend/app/models/knowledge_article.py
+++ b/backend/app/models/knowledge_article.py
@@ -12,6 +12,7 @@ class KnowledgeArticle(Base):
     __tablename__ = "knowledge_articles"
 
     id = Column(Integer, primary_key=True, index=True)
+    entity_id = Column(Integer, nullable=True, index=True, comment="企业ID: NULL=全局共享(系统教学), 有值=企业专属 (多租户隔离 2026-09-03)")
     title = Column(String(200), nullable=False, comment="文章标题")
     summary = Column(String(500), nullable=True, comment="一句话摘要")
     content = Column(Text, nullable=False, comment="文章正文（支持Markdown）")
diff --git a/backend/app/services/knowledge_service.py b/backend/app/services/knowledge_service.py
index 426fd4d9..57b7c498 100644
--- a/backend/app/services/knowledge_service.py
+++ b/backend/app/services/knowledge_service.py
@@ -19,7 +19,7 @@ from typing import Optional
 from sqlalchemy.orm import Session
 from sqlalchemy import func, and_
 
-from app.models import KnowledgeEvent, KnowledgeSummary, OperationLog, KPIAlert, KPIDefinition, KPIValue
+from app.models import KnowledgeEvent, KnowledgeSummary, OperationLog, KPIAlert, KPIDefinition, KPIValue, UserEntity
 
 logger = logging.getLogger("cma.knowledge")
 
@@ -66,16 +66,31 @@ async def _call_deepseek(prompt: str, timeout: int = 30) -> str:
 
 # ── 事件抽取 ──
 
-def extract_events(db: Session, since: datetime, until: Optional[datetime] = None) -> list[dict]:
-    """从 OperationLog + KPIAlert 中抽取关键事件
+def extract_events(db: Session, since: datetime, until: Optional[datetime] = None, entity_id: int = 1) -> list[dict]:
+    """从 OperationLog + KPIAlert 中抽取关键事件（按企业抽屉隔离）
     返回 dict 列表，用于喂给摘要 prompt
+
+    隔离说明（2026-09-03 多租户分区）：
+    - KPIAlert 带 entity_id 列 → 直接按 entity_id 过滤
+    - OperationLog 无 entity_id 列（数据债，P2 follow-up）→ 经 user_id→user_entities
+      归属当前企业；无授权归属的日志（user_id NULL/未授权）不进入本企业记忆
     """
     now = until or datetime.utcnow()
 
-    # 1. 操作日志 → 事件
+    # 0. 当前企业授权用户集合（OperationLog 归属过滤用）
+    auth_user_ids = [
+        uid for (uid,) in db.query(UserEntity.user_id)
+        .filter(UserEntity.entity_id == entity_id).all()
+    ]
+
+    # 1. 操作日志 → 事件（本企业授权用户的操作）
     logs = (
         db.query(OperationLog)
-        .filter(OperationLog.created_at >= since, OperationLog.created_at <= now)
+        .filter(
+            OperationLog.created_at >= since,
+            OperationLog.created_at <= now,
+            OperationLog.user_id.in_(auth_user_ids),  # 空集合 → IN (NULL) 不匹配任何行
+        )
         .order_by(OperationLog.created_at.asc())
         .all()
     )
@@ -96,11 +111,15 @@ def extract_events(db: Session, since: datetime, until: Optional[datetime] = Non
             "detail": detail_str,
         })
 
-    # 2. 预警记录 → 事件
+    # 2. 预警记录 → 事件（KPIAlert 直接按企业过滤）
     alerts = (
         db.query(KPIAlert, KPIDefinition.kpi_name, KPIDefinition.kpi_code)
         .join(KPIDefinition, KPIAlert.kpi_id == KPIDefinition.id)
-        .filter(KPIAlert.created_at >= since, KPIAlert.created_at <= now)
+        .filter(
+            KPIAlert.created_at >= since,
+            KPIAlert.created_at <= now,
+            KPIAlert.entity_id == entity_id,
+        )
         .order_by(KPIAlert.created_at.asc())
         .all()
     )
@@ -136,9 +155,12 @@ def _build_summary_prompt(events: list[dict], level: str, period_key: str) -> st
     return "\n".join(lines)
 
 
-async def _kpi_snapshot(db: Session) -> list[dict]:
-    """当前KPI快照 — 每个活跃KPI的最新实际值"""
-    kpis = db.query(KPIDefinition).filter(KPIDefinition.status == "active").all()
+async def _kpi_snapshot(db: Session, entity_id: int = 1) -> list[dict]:
+    """当前KPI快照 — 本企业每个活跃KPI的最新实际值（按账套隔离）"""
+    kpis = db.query(KPIDefinition).filter(
+        KPIDefinition.status == "active",
+        KPIDefinition.entity_id == entity_id,
+    ).all()
     snapshot = []
     for k in kpis:
         latest = (
@@ -165,6 +187,7 @@ async def generate_summary(
     since: datetime,
     until: Optional[datetime] = None,
     prev_summary: Optional[KnowledgeSummary] = None,
+    entity_id: int = 1,
 ) -> KnowledgeSummary:
     """生成一层摘要（daily/weekly/monthly/cumulative）
 
@@ -174,11 +197,12 @@ async def generate_summary(
         since: 事件开始时间
         until: 事件结束时间
         prev_summary: 前一层摘要（用于累积摘要继承）
+        entity_id: 企业账套（企业记忆分区 2026-09-03）
     """
     now = until or datetime.utcnow()
 
-    # 1. 抽取事件
-    events = extract_events(db, since, now)
+    # 1. 抽取事件（本企业）
+    events = extract_events(db, since, now, entity_id=entity_id)
 
     # 2. 构建 prompt
     prompt = _build_summary_prompt(events, level, period_key)
@@ -194,11 +218,12 @@ async def generate_summary(
     if not result_text or "无重要变化" in result_text:
         result_text = f"{level}汇总: 窗口 {period_key} 内共 {len(events)} 条事件记录，无重大变化需记录。"
 
-    # 6. 提取 KPI 快照
-    kpi_snapshot = await _kpi_snapshot(db)
+    # 6. 提取 KPI 快照（本企业）
+    kpi_snapshot = await _kpi_snapshot(db, entity_id=entity_id)
 
     # 7. 存入数据库
     summary = KnowledgeSummary(
+        entity_id=entity_id,
         level=level,
         period_key=period_key,
         title=f"{level.upper()}摘要 - {period_key}",
@@ -223,32 +248,36 @@ async def generate_summary(
 
 # ── 分层调度 ──
 
-def get_last_summary(db: Session, level: str) -> Optional[KnowledgeSummary]:
-    """获取该层最新（最新创建）的摘要"""
+def get_last_summary(db: Session, level: str, entity_id: int = 1) -> Optional[KnowledgeSummary]:
+    """获取该层最新（最新创建）的摘要（按企业隔离）"""
     return (
         db.query(KnowledgeSummary)
-        .filter(KnowledgeSummary.level == level, KnowledgeSummary.is_stale == 0)
+        .filter(
+            KnowledgeSummary.level == level,
+            KnowledgeSummary.is_stale == 0,
+            KnowledgeSummary.entity_id == entity_id,
+        )
         .order_by(KnowledgeSummary.id.desc())
         .first()
     )
 
 
-async def run_daily_summary(db: Session) -> KnowledgeSummary:
-    """运行每日摘要"""
+async def run_daily_summary(db: Session, entity_id: int = 1) -> KnowledgeSummary:
+    """运行每日摘要（企业记忆分区）"""
     today = date.today()
     period_key = today.isoformat()
     since = datetime(today.year, today.month, today.day)
 
     # 获取前一天摘要作为 prev
     yesterday = today - timedelta(days=1)
-    prev = get_last_summary(db, "daily")
+    prev = get_last_summary(db, "daily", entity_id=entity_id)
 
     return await generate_summary(
-        db, "daily", period_key, since, prev_summary=prev,
+        db, "daily", period_key, since, prev_summary=prev, entity_id=entity_id,
     )
 
 
-async def run_weekly_summary(db: Session) -> KnowledgeSummary:
+async def run_weekly_summary(db: Session, entity_id: int = 1) -> KnowledgeSummary:
     """运行每周摘要（周日执行）"""
     today = date.today()
     # ISO 周算法: 本周一到今天
@@ -257,13 +286,13 @@ async def run_weekly_summary(db: Session) -> KnowledgeSummary:
     since = today - timedelta(days=today.weekday())  # 本周一
     since_dt = datetime(since.year, since.month, since.day)
 
-    prev = get_last_summary(db, "weekly")
+    prev = get_last_summary(db, "weekly", entity_id=entity_id)
     return await generate_summary(
-        db, "weekly", period_key, since_dt, prev_summary=prev,
+        db, "weekly", period_key, since_dt, prev_summary=prev, entity_id=entity_id,
     )
 
 
-async def run_monthly_summary(db: Session) -> KnowledgeSummary:
+async def run_monthly_summary(db: Session, entity_id: int = 1) -> KnowledgeSummary:
     """运行月度摘要"""
     today = date.today()
     period_key = today.strftime("%Y-%m")
@@ -271,10 +300,10 @@ async def run_monthly_summary(db: Session) -> KnowledgeSummary:
 
     # 附属前一个月的 daily 和 weekly 摘要
     prev_month = today.replace(day=1) - timedelta(days=1)
-    prev = get_last_summary(db, "monthly")
+    prev = get_last_summary(db, "monthly", entity_id=entity_id)
 
     return await generate_summary(
-        db, "monthly", period_key, since, prev_summary=prev,
+        db, "monthly", period_key, since, prev_summary=prev, entity_id=entity_id,
     )
 
 
@@ -289,40 +318,41 @@ def generate_summary_sync(
     period_key: str,
     since: datetime,
     until: Optional[datetime] = None,
+    entity_id: int = 1,
 ) -> dict:
     """同步包装，用于 API 手动触发"""
     loop = asyncio.new_event_loop()
     try:
         summary = loop.run_until_complete(
-            generate_summary(db, level, period_key, since, until)
+            generate_summary(db, level, period_key, since, until, entity_id=entity_id)
         )
-        return {"id": summary.id, "level": summary.level, "period_key": summary.period_key}
+        return {"id": summary.id, "entity_id": summary.entity_id, "level": summary.level, "period_key": summary.period_key}
     finally:
         loop.close()
 
 
-def generate_daily_sync(db: Session) -> dict:
+def generate_daily_sync(db: Session, entity_id: int = 1) -> dict:
     loop = asyncio.new_event_loop()
     try:
-        summary = loop.run_until_complete(run_daily_summary(db))
-        return {"id": summary.id, "level": summary.level, "period_key": summary.period_key}
+        summary = loop.run_until_complete(run_daily_summary(db, entity_id))
+        return {"id": summary.id, "entity_id": summary.entity_id, "level": summary.level, "period_key": summary.period_key}
     finally:
         loop.close()
 
 
-def generate_weekly_sync(db: Session) -> dict:
+def generate_weekly_sync(db: Session, entity_id: int = 1) -> dict:
     loop = asyncio.new_event_loop()
     try:
-        summary = loop.run_until_complete(run_weekly_summary(db))
-        return {"id": summary.id, "level": summary.level, "period_key": summary.period_key}
+        summary = loop.run_until_complete(run_weekly_summary(db, entity_id))
+        return {"id": summary.id, "entity_id": summary.entity_id, "level": summary.level, "period_key": summary.period_key}
     finally:
         loop.close()
 
 
-def generate_monthly_sync(db: Session) -> dict:
+def generate_monthly_sync(db: Session, entity_id: int = 1) -> dict:
     loop = asyncio.new_event_loop()
     try:
-        summary = loop.run_until_complete(run_monthly_summary(db))
-        return {"id": summary.id, "level": summary.level, "period_key": summary.period_key}
+        summary = loop.run_until_complete(run_monthly_summary(db, entity_id))
+        return {"id": summary.id, "entity_id": summary.entity_id, "level": summary.level, "period_key": summary.period_key}
     finally:
         loop.close()
diff --git a/backend/tests/test_security_knowledge_partition.py b/backend/tests/test_security_knowledge_partition.py
new file mode 100644
index 00000000..ecbc7d6a
--- /dev/null
+++ b/backend/tests/test_security_knowledge_partition.py
@@ -0,0 +1,220 @@
+"""企业记忆分区（knowledge 侧 entity_id 多租户隔离）测试（2026-09-03 P1）
+
+覆盖任务 DoD：
+- knowledge_events / knowledge_summaries / knowledge_articles 三表 entity_id 隔离
+- 摘要列表/详情强制 entity 过滤（entity1 查不到 entity2 → 404/空集）
+- 摘要生成自动带 entity_id（写入当前账套抽屉）
+- 知识文章：全局共享(NULL) ∪ 本企业专属；他企专属 404
+- extract_events 按企业隔离（KPIAlert 直过滤 + OperationLog 经 user_entities 归属）
+"""
+import pytest
+from datetime import datetime, timedelta
+from fastapi.testclient import TestClient
+from sqlalchemy.orm import Session
+
+from app.models import KPIDefinition, KPIAlert, Entity
+from app.models.knowledge import KnowledgeSummary, KnowledgeEvent
+from app.models.knowledge_article import KnowledgeArticle
+from app.services import knowledge_service
+from tests.conftest import create_test_kpi, create_test_user, get_token_for_user, auth_header
+
+SUMMARY_FIELDS = dict(
+    level="daily", period_key="2026-09-01", content="测试摘要内容",
+    generated_by="test", is_stale=0,
+)
+
+
+def _ensure_entity(db: Session, eid: int, name: str = None) -> Entity:
+    ent = db.query(Entity).filter(Entity.id == eid).first()
+    if not ent:
+        ent = Entity(id=eid, name=name or f"企业{eid}", short_name=f"E{eid}", status="active")
+        db.add(ent)
+        db.commit()
+        db.refresh(ent)
+    return ent
+
+
+def _login_token(client: TestClient, username: str = "testadmin",
+                 password: str = "admin123", entity_id: int = 1) -> str:
+    """登录指定账套返回 token（conftest.get_token_for_user 固定 entity1，这里参数化）"""
+    resp = client.post("/api/cma/auth/login", json={
+        "username": username, "password": password, "entity_id": entity_id,
+    })
+    assert resp.status_code == 200, resp.text
+    return resp.json().get("token")
+
+
+# ============================================================
+# summaries 抽屉隔离
+# ============================================================
+class TestKnowledgeSummaryIsolation:
+    def test_list_summaries_entity_scoped(self, client: TestClient, db: Session):
+        """摘要列表按 entity 隔离：entity1 看不到 entity2 的摘要"""
+        _ensure_entity(db, 2)
+        s1 = KnowledgeSummary(**SUMMARY_FIELDS, title="E1摘要", entity_id=1)
+        s2 = KnowledgeSummary(**SUMMARY_FIELDS, title="E2专属摘要", entity_id=2)
+        db.add_all([s1, s2])
+        db.commit()
+        db.refresh(s1)
+        db.refresh(s2)
+
+        create_test_user(db)
+        token1 = _login_token(client, entity_id=1)
+        r1 = client.get("/api/cma/knowledge/summaries", headers=auth_header(token1))
+        assert r1.status_code == 200, r1.text
+        items = r1.json()["items"]
+        titles = [i["title"] for i in items]
+        assert any("摘要" in t for t in titles)
+        assert "E2专属摘要" not in titles
+
+    def test_get_summary_cross_entity_404(self, client: TestClient, db: Session):
+        """越权：entity1 直取 entity2 摘要详情 → 404（防跨企业探测）"""
+        _ensure_entity(db, 2)
+        s2 = KnowledgeSummary(**SUMMARY_FIELDS, title="E2秘密摘要", entity_id=2)
+        db.add(s2)
+        db.commit()
+        db.refresh(s2)
+
+        create_test_user(db)
+        token1 = _login_token(client, entity_id=1)
+        r = client.get(f"/api/cma/knowledge/summaries/{s2.id}", headers=auth_header(token1))
+        assert r.status_code == 404
+
+        # 反向：entity2 取 entity1 摘要同样 404
+        s1 = KnowledgeSummary(**SUMMARY_FIELDS, title="E1摘要", entity_id=1)
+        db.add(s1)
+        db.commit()
+        db.refresh(s1)
+        token2 = _login_token(client, entity_id=2)
+        r2 = client.get(f"/api/cma/knowledge/summaries/{s1.id}", headers=auth_header(token2))
+        assert r2.status_code == 404
+
+    def test_get_summary_own_entity_ok(self, client: TestClient, db: Session):
+        """同企业取自己摘要详情 → 200"""
+        s1 = KnowledgeSummary(**SUMMARY_FIELDS, title="E1自己的摘要", entity_id=1)
+        db.add(s1)
+        db.commit()
+        db.refresh(s1)
+        create_test_user(db)
+        token1 = _login_token(client, entity_id=1)
+        r = client.get(f"/api/cma/knowledge/summaries/{s1.id}", headers=auth_header(token1))
+        assert r.status_code == 200
+        assert r.json()["title"] == "E1自己的摘要"
+
+
+# ============================================================
+# 摘要生成自动带 entity_id
+# ============================================================
+class TestKnowledgeGenerateWritesEntity:
+    def test_generate_daily_writes_current_entity(self, client: TestClient, db: Session, monkeypatch):
+        """generate/daily 写入当前账套抽屉：entity1 触发 → 摘要 entity_id=1；entity2 触发 → =2"""
+        _ensure_entity(db, 2)
+
+        async def _fake_deepseek(prompt: str, timeout: int = 30) -> str:
+            return "测试摘要：本期无重大变化。"
+        monkeypatch.setattr(knowledge_service, "_call_deepseek", _fake_deepseek)
+
+        create_test_user(db)
+        token1 = _login_token(client, entity_id=1)
+        r1 = client.post("/api/cma/knowledge/generate/daily", headers=auth_header(token1))
+        assert r1.status_code == 200, r1.text
+        assert r1.json()["summary"]["entity_id"] == 1
+
+        token2 = _login_token(client, entity_id=2)
+        r2 = client.post("/api/cma/knowledge/generate/daily", headers=auth_header(token2))
+        assert r2.status_code == 200, r2.text
+        assert r2.json()["summary"]["entity_id"] == 2
+
+        # DB 回查：两账套抽屉各一条自己的
+        e1 = db.query(KnowledgeSummary).filter(KnowledgeSummary.entity_id == 1).count()
+        e2 = db.query(KnowledgeSummary).filter(KnowledgeSummary.entity_id == 2).count()
+        assert e1 >= 1
+        assert e2 >= 1
+
+
+# ============================================================
+# 知识文章：全局共享 ∪ 本企业专属
+# ============================================================
+class TestKnowledgeArticlesGlobalUnion:
+    def test_articles_global_union_scope(self, client: TestClient, db: Session):
+        """文章查询 = 本企业专属 ∪ 全局共享；他企专属不可见"""
+        _ensure_entity(db, 2)
+        g = KnowledgeArticle(title="全局教学文章", content="c", category="term", entity_id=None)
+        e1 = KnowledgeArticle(title="E1专属文章", content="c", category="term", entity_id=1)
+        e2 = KnowledgeArticle(title="E2专属文章", content="c", category="term", entity_id=2)
+        db.add_all([g, e1, e2])
+        db.commit()
+        for a in (g, e1, e2):
+            db.refresh(a)
+
+        create_test_user(db)
+        token1 = _login_token(client, entity_id=1)
+        r1 = client.get("/api/cma/knowledge-articles", headers=auth_header(token1))
+        assert r1.status_code == 200, r1.text
+        titles1 = {i["title"] for i in r1.json()["data"]}
+        assert "全局教学文章" in titles1          # 全局共享可见
+        assert "E1专属文章" in titles1            # 本企业专属可见
+        assert "E2专属文章" not in titles1        # 他企专属不可见
+
+        token2 = _login_token(client, entity_id=2)
+        r2 = client.get("/api/cma/knowledge-articles", headers=auth_header(token2))
+        titles2 = {i["title"] for i in r2.json()["data"]}
+        assert "全局教学文章" in titles2
+        assert "E2专属文章" in titles2
+        assert "E1专属文章" not in titles2
+
+    def test_get_article_cross_entity_404(self, client: TestClient, db: Session):
+        """越权：entity1 直取 entity2 专属文章 → 404；全局文章两账套可取"""
+        _ensure_entity(db, 2)
+        g = KnowledgeArticle(title="全局文章", content="c", entity_id=None)
+        e2 = KnowledgeArticle(title="E2秘密文章", content="c", entity_id=2)
+        db.add_all([g, e2])
+        db.commit()
+        db.refresh(g)
+        db.refresh(e2)
+
+        create_test_user(db)
+        token1 = _login_token(client, entity_id=1)
+        assert client.get(f"/api/cma/knowledge-articles/{g.id}", headers=auth_header(token1)).status_code == 200
+        assert client.get(f"/api/cma/knowledge-articles/{e2.id}", headers=auth_header(token1)).status_code == 404
+
+
+# ============================================================
+# extract_events 企业隔离（service 层精确断言）
+# ============================================================
+class TestExtractEventsIsolation:
+    def _seed_alerts(self, db: Session):
+        k1 = create_test_kpi(db, kpi_code="KE_E1", entity_id=1, status="active")
+        k2 = create_test_kpi(db, kpi_code="KE_E2", entity_id=2, status="active")
+        db.add(KPIAlert(kpi_id=k1.id, alert_level="red", alert_message="E1企业预警信息",
+                        status="pending", entity_id=1))
+        db.add(KPIAlert(kpi_id=k2.id, alert_level="red", alert_message="E2企业预警信息",
+                        status="pending", entity_id=2))
+        db.commit()
+        return k1, k2
+
+    def test_extract_events_only_own_entity(self, client: TestClient, db: Session):
+        """extract_events(entity_id=1) 只含 E1 的预警，不含 E2"""
+        _ensure_entity(db, 2)
+        self._seed_alerts(db)
+        since = datetime.utcnow() - timedelta(days=1)
+        ev1 = knowledge_service.extract_events(db, since, None, entity_id=1)
+        ev2 = knowledge_service.extract_events(db, since, None, entity_id=2)
+        txt1 = "\n".join(str(e) for e in ev1)
+        txt2 = "\n".join(str(e) for e in ev2)
+        assert "E1企业预警信息" in txt1
+        assert "E2企业预警信息" not in txt1   # 核心越权断言：E1 抽不到 E2
+        assert "E2企业预警信息" in txt2
+        assert "E1企业预警信息" not in txt2
+
+    def test_api_events_entity_scoped(self, client: TestClient, db: Session):
+        """API /knowledge/events 按 token 账套过滤事件"""
+        _ensure_entity(db, 2)
+        self._seed_alerts(db)
+        create_test_user(db)
+        token1 = _login_token(client, entity_id=1)
+        r = client.get("/api/cma/knowledge/events", headers=auth_header(token1))
+        assert r.status_code == 200, r.text
+        body = "\n".join(str(e) for e in r.json()["events"])
+        assert "E1企业预警信息" in body
+        assert "E2企业预警信息" not in body
diff --git a/docs/knowledge-entity-partition-plan-20260903.md b/docs/knowledge-entity-partition-plan-20260903.md
new file mode 100644
index 00000000..223093ab
--- /dev/null
+++ b/docs/knowledge-entity-partition-plan-20260903.md
@@ -0,0 +1,95 @@
+# CMA 知识侧 entity_id 多租户分区——迁移方案（评审稿）
+
+> 任务：CMA-entity-memory-partition-20260903（研学调度 P1）
+> 提出者：yanxueBot → 执行人：wecom-fullstack
+> 决策依据：/root/WB_WS/_research/architecture-shared-intelligence-isolated-data-20260903.md 第八节行动2（🔴 唯一隔离缺口：客户侧知识未按 entity_id 分区）
+> 日期：2026-09-03 | 状态：评审稿（代码落地后由项目Bot独立复核）
+
+## 一、调研实证（先查系统再决策）
+
+### 1.1 生产库现状（2026-09-03 实测）
+
+| 表 | 行数 | entity_id | 写入路径 | 语义 |
+|---|---|---|---|---|
+| knowledge_events | **0** | ❌ 无 | 无任何写入路径（extract_events 只返回 dict 喂 prompt，不落库） | 企业事件记忆（设计态） |
+| knowledge_summaries | **0** | ❌ 无 | 仅 API 手动触发 /knowledge/generate/*（knowledge_service.generate_summary） | 企业知识摘要（设计态） |
+| knowledge_articles | **38** | ❌ 无 | seed_knowledge_articles.py / import_cma_knowledge.py（系统教学知识 seed） | CMA 教学知识库（term/formula/practice/方法论/案例） |
+
+### 1.2 账套事实（纠正任务单假设）
+
+- **entity 1 = 陕西酣客文化传媒（白酒经销, active）**
+- **entity 2 = 陕西博海网络科技（IT服务, active）**
+- entity 3-5 = 测试/demo 企业
+
+任务单写"博海=entity 1 兜底？酣客=entity 2？"与生产**相反**。实际无需"归属确认"到具体企业——因为见 1.3。
+
+### 1.3 存量归属结论（本次方案的关键决策点）
+
+1. **knowledge_events / knowledge_summaries：零存量**（0 行）→ 无迁移负担。加列后新写入必须带 entity_id（从请求上下文解析）。
+2. **knowledge_articles 38 行 = CMA 系统教学知识**（术语/公式/实务/方法论/CMA案例/税务合规等），**语义属于共享层**——对照架构决策文档：
+   > 共享层（越大越好）：判断模型/方法论/科目映射模式库/合规规则
+   > 隔离层（必须严格）：企业数据/账套/权限/审计/记忆
+   
+   教学文章不是"企业 A 的记忆 vs 企业 B 的记忆"，而是"CMA 方法论知识库"（所有企业共享，越大越好）。
+   
+   **→ 归属映射 = NULL = 全局共享**（不归酣客也不归博海）。
+   若硬性归 entity=1，则 entity 2（博海）登录后 CMA 知识库页/嵌入知识全空——破坏既有产品体验，也违背"共享层不重复"原则。
+   **附带推论**：任务验收"存量数据归属映射已确认"的答案 = 存量文章保持全局共享（entity_id NULL），只有未来企业自定义文章才进入企业抽屉。若任总/研学希望个别文章改为企业专属，一条 `UPDATE knowledge_articles SET entity_id=N WHERE id=...` 即可，成本可忽略。
+
+### 1.4 数据债边界（本次不扩，记录 follow-up）
+
+- **operation_logs 无 entity_id 列**（模型+库均无；写入点分布在 kpis/data/ai_suggestions/budget_generate/alert_rules/auth/templates 等 7+ 文件）。任务验收"审计：OperationLog 记录知识操作的企业归属"**无法在当前表结构下实现**——为 operation_logs 加 entity_id 属独立数据债（影响全部 7+ 写入点，需要全量排查 user→entity 归属，与 2026-08-31 安全修复同级工作量），本次不动，记为 P2 follow-up。
+- 折衷：知识操作本身走 require_role + Depends(get_entity_id)，操作发生在**已隔离的企业上下文内**；OperationLog.user_id → user_entities 可回溯归属。隔离缺口不因 operation_logs 无列而扩大（日志不是知识数据出口）。
+
+## 二、设计定稿
+
+### 2.1 三类语义 × 隔离策略
+
+| 表 | entity_id 设计 | 查询语义 | 写入语义 |
+|---|---|---|---|
+| knowledge_events | `INT NOT NULL DEFAULT 1` + 索引 | 强制 `entity_id == 当前账套` | 事件抽取/记录必须从上下文带 entity_id |
+| knowledge_summaries | `INT NOT NULL DEFAULT 1` + 索引 | 强制 `entity_id == 当前账套` | generate 时从当前账套写入 |
+| knowledge_articles | `INT NULL`（NULL=全局共享）+ 索引 | `entity_id == 当前账套 OR entity_id IS NULL`（全局∪专属） | seed/import 默认 NULL=全局；未来企业专属文章带 entity_id |
+
+articles 的 OR NULL 是**有意为之**：教学知识留在共享层不被隔离吞掉，企业专属知识进抽屉严格隔离。越权核心验证对象是 events/summaries（企业记忆抽屉互不可见）+ articles 企业专属行互不可见。
+
+### 2.2 归属与隔离验证（对应任务验收"越权测试"）
+
+- entity 1（酣客）上下文查不到 entity 2（博海）的 events/summaries → 404/空集
+- entity 1 查不到 entity 2 的专属 article → 404（不暴露存在性）
+- 全局 article（NULL）两账套均可见 → 教学知识不丢
+- 双实体实测记录见验收文档
+
+## 三、代码落地清单（评审通过后执行）
+
+1. **models/knowledge.py**：KnowledgeEvent.entity_id / KnowledgeSummary.entity_id 加 `default=1, index=True`
+2. **models/knowledge_article.py**：KnowledgeArticle.entity_id 加 `nullable=True, index=True`（NULL=全局共享）
+3. **生产 DB ALTER**（MySQL，空表/小表零风险）：
+   ```sql
+   ALTER TABLE knowledge_events ADD COLUMN entity_id INT NOT NULL DEFAULT 1 COMMENT '企业ID (多租户隔离 2026-09-03)', ADD INDEX ix_knowledge_events_entity_id (entity_id);
+   ALTER TABLE knowledge_summaries ADD COLUMN entity_id INT NOT NULL DEFAULT 1 COMMENT '企业ID (多租户隔离 2026-09-03)', ADD INDEX ix_knowledge_summaries_entity_id (entity_id);
+   ALTER TABLE knowledge_articles ADD COLUMN entity_id INT NULL DEFAULT NULL COMMENT '企业ID: NULL=全局共享, 有值=企业专属 (多租户隔离 2026-09-03)', ADD INDEX ix_knowledge_articles_entity_id (entity_id);
+   ```
+4. **services/knowledge_service.py** 全链路：
+   - `extract_events(db, since, until, entity_id)`：KPIAlert 直接按 entity_id 过滤；OperationLog 无 entity_id 列 → 经 user_id→user_entities 子查询过滤（user_id NULL 的日志跳过，标注临时方案）
+   - `_kpi_snapshot(db, entity_id)`：KPIDefinition 加 entity 过滤（现状漏企业，跨企业 KPI 会被喂进对方摘要 prompt——真实泄漏点）
+   - `generate_summary(..., entity_id)`：抽取+快照传 entity_id；KnowledgeSummary 写入 entity_id
+   - `get_last_summary(db, level, entity_id)` / `run_daily|weekly|monthly_summary(db, entity_id)` / `generate_*_sync(db, entity_id)`
+5. **api/knowledge.py**：8 个业务端点（summaries 列表/latest/详情、events、generate daily/weekly/monthly）加 `entity_id: int = Depends(get_entity_id)` 并强制过滤；get_summary 详情校验归属（非本企业 → 404）。ethics-quiz 为静态公共题库不动。
+6. **api/knowledge_articles.py**：list/get 加 Depends(get_entity_id)；过滤 `or_(entity_id == cur, entity_id.is_(None))`；get_article 企业专属行非本企业 → 404
+7. **测试**：新增 test_security_knowledge_partition.py（双实体互查越权 + 全局文章双可见 + generate 自动带 entity_id，monkeypatch DeepSeek 免网络）；pytest 全量回归
+8. 前端零改动（token-first：登录用户 token 已绑 entity，拦截器不显式传 entity_id 时后端取 token 绑定值）
+
+## 四、验证门禁
+
+1. schema_check.py ORM↔DB 一致（加列后）
+2. pytest 全量无新增失败（对照基线 726 passed / 4 failed(日历漂移) / 1 xfailed）
+3. 双实体越权实测脚本（生产 E2E：登 entity1 查不到 entity2 摘要/文章、entity2 专属行 404、全局文章两可见）
+4. 部署冒烟 5 项
+
+## 五、评审记录
+
+（待项目Bot/任总复核后回填结论；若对 articles 归属语义有异议，仅需 UPDATE 存量行，代码逻辑不变）
+
+---
+产出物路径：本文档将随代码提交至 cma 仓库 docs/ + 归档 fullstack _reports/