diff --git a/alert_service.py b/alert_service.py
index fc36b47..bd81af4 100644
--- a/alert_service.py
+++ b/alert_service.py
@@ -5,12 +5,12 @@ from datetime import date, datetime
 from typing import Any
 
 from app_config import validate_text
-from database import ReviewDatabase
+from backend.database.repositories import AlertRepository
 
 
 class AlertService:
-    def __init__(self, database: ReviewDatabase) -> None:
-        self.database = database
+    def __init__(self, repository: AlertRepository) -> None:
+        self.repository = repository
 
     def create_manual(self, user_id: int, payload: dict[str, Any]) -> int:
         title = validate_text(payload.get("title"), "提醒标题", 80, required=True)
@@ -19,7 +19,7 @@ class AlertService:
         available_date = self.calendar_date(
             str(payload.get("remind_date") or date.today().isoformat())
         )
-        return self.database.save_alert(
+        return self.repository.save_alert(
             user_id=user_id,
             kind="manual",
             title=title,
@@ -44,7 +44,7 @@ class AlertService:
             if observed:
                 win_rate = summary.get("t1_win_rate")
                 suffix = f"，当前红盘率 {win_rate:.1f}%" if win_rate is not None else ""
-                self.database.save_alert(
+                self.repository.save_alert(
                     user_id, "strategy_t1", f"{strategy_name} 已有 T+1 反馈",
                     f"{observed}/{len(items)} 只标的已有首日表现{suffix}。",
                     today, "", f"strategy:{run_id}:t1",
@@ -53,7 +53,7 @@ class AlertService:
             if completed == len(items):
                 average = summary.get("average_t5")
                 suffix = f"，平均收益 {average:+.2f}%" if average is not None else ""
-                self.database.save_alert(
+                self.repository.save_alert(
                     user_id, "strategy_t5", f"{strategy_name} 五日跟踪完成",
                     f"本批 {len(items)} 只标的已完成 T+5 跟踪{suffix}。",
                     today, "", f"strategy:{run_id}:t5",
@@ -67,15 +67,24 @@ class AlertService:
         if status not in {"all", "unread"}:
             raise ValueError("提醒筛选不支持。")
         compact_date = self.calendar_date(as_of or date.today().isoformat())
-        items = self.database.list_alerts(user_id, compact_date, status == "unread")
+        items = self.repository.list_alerts(user_id, compact_date, status == "unread")
         for item in items:
             item["due"] = str(item.get("available_date") or "") <= compact_date
         return {
             "items": items,
-            "unread_count": self.database.count_unread_alerts(user_id, compact_date),
+            "unread_count": self.repository.count_unread_alerts(user_id, compact_date),
             "as_of": compact_date,
         }
 
+    def mark_read(self, user_id: int, alert_id: int) -> bool:
+        return self.repository.mark_alert_read(user_id, alert_id)
+
+    def mark_all_read(self, user_id: int, as_of: str) -> int:
+        return self.repository.mark_all_alerts_read(user_id, as_of)
+
+    def delete(self, user_id: int, alert_id: int) -> bool:
+        return self.repository.delete_alert(user_id, alert_id)
+
     @staticmethod
     def calendar_date(value: str) -> str:
         compact = value.replace("-", "").strip()
diff --git a/backend/bootstrap/container.py b/backend/bootstrap/container.py
index 0060ad6..7b87880 100644
--- a/backend/bootstrap/container.py
+++ b/backend/bootstrap/container.py
@@ -6,6 +6,7 @@ from collections.abc import Callable
 
 from alert_service import AlertService
 from backend.data import DataGateway, build_data_gateway
+from backend.database.repositories import RepositoryBundle, build_repository_bundle
 from chart_data_provider import MarketChartClient
 from database import ReviewDatabase
 from ifind_client import IfindHttpClient
@@ -19,6 +20,7 @@ from trade_journal import TradeJournalService
 @dataclass(frozen=True)
 class ApplicationContainer:
     database: ReviewDatabase
+    repositories: RepositoryBundle
     data_gateway: DataGateway
     ifind: IfindHttpClient
     screener: ScreenerEngine
@@ -38,14 +40,16 @@ def build_application_container(
     tushare_token_supplier: Callable[[], str] | None = None,
 ) -> ApplicationContainer:
     data_gateway = build_data_gateway(credentials, tushare_token_supplier)
+    repositories = build_repository_bundle(database)
     return ApplicationContainer(
         database=database,
+        repositories=repositories,
         data_gateway=data_gateway,
         ifind=data_gateway.ifind,
         screener=ScreenerEngine(database),
-        strategy_tracking=StrategyTrackingService(database),
-        alert_service=AlertService(database),
-        trade_journal=TradeJournalService(database),
+        strategy_tracking=StrategyTrackingService(repositories.strategy_tracking),
+        alert_service=AlertService(repositories.alerts),
+        trade_journal=TradeJournalService(repositories.trades),
         mentor_skills=MentorSkillRegistry(mentor_skills_dir, private_mentor_skills_dir),
         realtime_aggregator=data_gateway.realtime_observer,
         chart_data=data_gateway.chart_data,
diff --git a/backend/database/repositories/__init__.py b/backend/database/repositories/__init__.py
new file mode 100644
index 0000000..d48c58c
--- /dev/null
+++ b/backend/database/repositories/__init__.py
@@ -0,0 +1,21 @@
+from .ports import AlertRepository, StrategyTrackingRepository, TradeJournalRepository
+from .sqlite import (
+    RepositoryBundle,
+    SQLiteAlertRepository,
+    SQLiteStrategyTrackingRepository,
+    SQLiteTradeJournalRepository,
+    build_repository_bundle,
+    require_user_id,
+)
+
+__all__ = [
+    "AlertRepository",
+    "RepositoryBundle",
+    "SQLiteAlertRepository",
+    "SQLiteStrategyTrackingRepository",
+    "SQLiteTradeJournalRepository",
+    "StrategyTrackingRepository",
+    "TradeJournalRepository",
+    "build_repository_bundle",
+    "require_user_id",
+]
diff --git a/backend/database/repositories/ports.py b/backend/database/repositories/ports.py
new file mode 100644
index 0000000..bfadf18
--- /dev/null
+++ b/backend/database/repositories/ports.py
@@ -0,0 +1,52 @@
+from __future__ import annotations
+
+from typing import Any, Protocol
+
+
+class AlertRepository(Protocol):
+    def save_alert(
+        self, user_id: int, kind: str, title: str, content: str,
+        available_date: str, code: str, dedupe_key: str,
+    ) -> int: ...
+
+    def list_alerts(
+        self, user_id: int, as_of: str, unread_only: bool = False, limit: int = 100,
+    ) -> list[dict[str, Any]]: ...
+
+    def count_unread_alerts(self, user_id: int, as_of: str) -> int: ...
+
+    def mark_alert_read(self, user_id: int, alert_id: int) -> bool: ...
+
+    def mark_all_alerts_read(self, user_id: int, as_of: str) -> int: ...
+
+    def delete_alert(self, user_id: int, alert_id: int) -> bool: ...
+
+
+class TradeJournalRepository(Protocol):
+    def save_trade_entry(self, *args: Any, **kwargs: Any) -> int: ...
+
+    def list_trade_entries(
+        self, user_id: int, start_date: str = "", end_date: str = "",
+        code: str = "", limit: int = 300,
+    ) -> list[dict[str, Any]]: ...
+
+    def delete_trade_entry(self, user_id: int, trade_id: int) -> bool: ...
+
+
+class StrategyTrackingRepository(Protocol):
+    def save_strategy_tracks(
+        self, user_id: int, run_id: int, selection_date: str,
+        strategy_name: str, candidates: list[dict[str, Any]],
+    ) -> int: ...
+
+    def get_screener_run(self, user_id: int, run_id: int) -> dict[str, Any] | None: ...
+
+    def delete_strategy_track(self, user_id: int, track_id: int) -> bool: ...
+
+    def list_strategy_tracks(
+        self, user_id: int, limit_batches: int = 12,
+    ) -> list[dict[str, Any]]: ...
+
+    def load_tracking_bars(
+        self, targets: list[tuple[str, str]], limit: int = 5,
+    ) -> dict[tuple[str, str], list[dict[str, Any]]]: ...
diff --git a/backend/database/repositories/sqlite.py b/backend/database/repositories/sqlite.py
new file mode 100644
index 0000000..22e206e
--- /dev/null
+++ b/backend/database/repositories/sqlite.py
@@ -0,0 +1,108 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Any
+
+from database import ReviewDatabase
+
+
+def require_user_id(value: int) -> int:
+    user_id = int(value)
+    if user_id <= 0:
+        raise ValueError("A positive account owner is required")
+    return user_id
+
+
+@dataclass(frozen=True)
+class SQLiteAlertRepository:
+    database: ReviewDatabase
+
+    def save_alert(self, user_id: int, *args: Any, **kwargs: Any) -> int:
+        return self.database.save_alert(require_user_id(user_id), *args, **kwargs)
+
+    def list_alerts(
+        self, user_id: int, as_of: str, unread_only: bool = False, limit: int = 100,
+    ) -> list[dict[str, Any]]:
+        return self.database.list_alerts(
+            require_user_id(user_id), as_of, unread_only, limit
+        )
+
+    def count_unread_alerts(self, user_id: int, as_of: str) -> int:
+        return self.database.count_unread_alerts(require_user_id(user_id), as_of)
+
+    def mark_alert_read(self, user_id: int, alert_id: int) -> bool:
+        return self.database.mark_alert_read(require_user_id(user_id), alert_id)
+
+    def mark_all_alerts_read(self, user_id: int, as_of: str) -> int:
+        return self.database.mark_all_alerts_read(require_user_id(user_id), as_of)
+
+    def delete_alert(self, user_id: int, alert_id: int) -> bool:
+        return self.database.delete_alert(require_user_id(user_id), alert_id)
+
+
+@dataclass(frozen=True)
+class SQLiteTradeJournalRepository:
+    database: ReviewDatabase
+
+    def save_trade_entry(self, user_id: int, *args: Any, **kwargs: Any) -> int:
+        return self.database.save_trade_entry(require_user_id(user_id), *args, **kwargs)
+
+    def list_trade_entries(
+        self, user_id: int, start_date: str = "", end_date: str = "",
+        code: str = "", limit: int = 300,
+    ) -> list[dict[str, Any]]:
+        return self.database.list_trade_entries(
+            require_user_id(user_id), start_date, end_date, code, limit
+        )
+
+    def delete_trade_entry(self, user_id: int, trade_id: int) -> bool:
+        return self.database.delete_trade_entry(require_user_id(user_id), trade_id)
+
+
+@dataclass(frozen=True)
+class SQLiteStrategyTrackingRepository:
+    database: ReviewDatabase
+
+    def save_strategy_tracks(
+        self, user_id: int, run_id: int, selection_date: str,
+        strategy_name: str, candidates: list[dict[str, Any]],
+    ) -> int:
+        return self.database.save_strategy_tracks(
+            require_user_id(user_id), run_id, selection_date, strategy_name, candidates
+        )
+
+    def get_screener_run(self, user_id: int, run_id: int) -> dict[str, Any] | None:
+        owner_id = int(user_id)
+        if owner_id < 0:
+            raise ValueError("Account owner cannot be negative")
+        return self.database.get_screener_run(owner_id, run_id)
+
+    def delete_strategy_track(self, user_id: int, track_id: int) -> bool:
+        return self.database.delete_strategy_track(require_user_id(user_id), track_id)
+
+    def list_strategy_tracks(
+        self, user_id: int, limit_batches: int = 12,
+    ) -> list[dict[str, Any]]:
+        return self.database.list_strategy_tracks(
+            require_user_id(user_id), limit_batches
+        )
+
+    def load_tracking_bars(
+        self, targets: list[tuple[str, str]], limit: int = 5,
+    ) -> dict[tuple[str, str], list[dict[str, Any]]]:
+        return self.database.load_tracking_bars(targets, limit)
+
+
+@dataclass(frozen=True)
+class RepositoryBundle:
+    alerts: SQLiteAlertRepository
+    trades: SQLiteTradeJournalRepository
+    strategy_tracking: SQLiteStrategyTrackingRepository
+
+
+def build_repository_bundle(database: ReviewDatabase) -> RepositoryBundle:
+    return RepositoryBundle(
+        alerts=SQLiteAlertRepository(database),
+        trades=SQLiteTradeJournalRepository(database),
+        strategy_tracking=SQLiteStrategyTrackingRepository(database),
+    )
diff --git a/docs/governance/architecture-inventory.json b/docs/governance/architecture-inventory.json
index b8f397d..8595f96 100644
--- a/docs/governance/architecture-inventory.json
+++ b/docs/governance/architecture-inventory.json
@@ -265,7 +265,7 @@
     },
     {
       "path": "server.py",
-      "bytes": 267835,
+      "bytes": 267824,
       "lines": 5947
     },
     {
diff --git a/docs/governance/stage-09-repositories.md b/docs/governance/stage-09-repositories.md
new file mode 100644
index 0000000..a4a105c
--- /dev/null
+++ b/docs/governance/stage-09-repositories.md
@@ -0,0 +1,27 @@
+# Stage 09: Account-Scoped Repository Boundaries
+
+Date: 2026-07-29
+
+## Result
+
+- Added narrow repository ports for alerts, the trade journal, and strategy tracking.
+- Added SQLite adapters that expose only the persistence operations each service requires.
+- Required a positive account owner on every private read, write, update, and delete path.
+- Kept the shared automatic screener-run lookup explicit as the sole zero-owner read in the
+  strategy tracking adapter.
+- Routed the application container through a repository bundle.
+- Removed direct alert and trade deletion/update calls from the HTTP-facing dashboard service.
+- Preserved structural compatibility for isolated tests and gradual extraction from the legacy
+  database facade.
+
+## Boundary
+
+Application services depend on repository protocols. The SQLite implementation may later be
+replaced without changing those services. Repository adapters do not call market providers,
+and provider adapters do not access user tables.
+
+## Residual Migration
+
+The legacy `ReviewDatabase` still contains the SQL behind these adapters and remains the
+compatibility facade for features not yet extracted. Subsequent feature stages can move SQL
+behind the same ports one feature at a time after account-isolation tests pass.
diff --git a/server.py b/server.py
index 2304088..0ac19f6 100644
--- a/server.py
+++ b/server.py
@@ -1494,16 +1494,16 @@ class DashboardService:
         return {"id": alert_id, **self.alert_center()}
 
     def mark_alert_read(self, alert_id: int) -> dict[str, Any]:
-        self.database.mark_alert_read(self.current_user_id, alert_id)
+        self.alert_service.mark_read(self.current_user_id, alert_id)
         return self.alert_center()
 
     def mark_all_alerts_read(self, as_of: str = "") -> dict[str, Any]:
         compact_date = self.alert_service.calendar_date(as_of or date.today().isoformat())
-        self.database.mark_all_alerts_read(self.current_user_id, compact_date)
+        self.alert_service.mark_all_read(self.current_user_id, compact_date)
         return self.alert_center(as_of=compact_date)
 
     def delete_alert(self, alert_id: int) -> dict[str, Any]:
-        deleted = self.database.delete_alert(self.current_user_id, alert_id)
+        deleted = self.alert_service.delete(self.current_user_id, alert_id)
         return {"deleted": deleted, **self.alert_center()}
 
     def trade_entries(
@@ -1598,7 +1598,7 @@ class DashboardService:
         return {"id": trade_id, **self.trade_entries()}
 
     def delete_trade_entry(self, trade_id: int) -> dict[str, Any]:
-        deleted = self.database.delete_trade_entry(self.current_user_id, trade_id)
+        deleted = self.trade_journal.delete(self.current_user_id, trade_id)
         return {"deleted": deleted, **self.trade_entries()}
 
     def assistant_messages(self) -> list[dict[str, Any]]:
diff --git a/strategy_tracking.py b/strategy_tracking.py
index 926545c..f20c646 100644
--- a/strategy_tracking.py
+++ b/strategy_tracking.py
@@ -2,12 +2,12 @@ from __future__ import annotations
 
 from typing import Any
 
-from database import ReviewDatabase
+from backend.database.repositories import StrategyTrackingRepository
 
 
 class StrategyTrackingService:
-    def __init__(self, database: ReviewDatabase) -> None:
-        self.database = database
+    def __init__(self, repository: StrategyTrackingRepository) -> None:
+        self.repository = repository
 
     def record_run(
         self,
@@ -17,14 +17,14 @@ class StrategyTrackingService:
         strategy_name: str,
         candidates: list[dict[str, Any]],
     ) -> int:
-        return self.database.save_strategy_tracks(
+        return self.repository.save_strategy_tracks(
             user_id, run_id, selection_date, strategy_name, candidates
         )
 
     def add_candidate(self, user_id: int, run_id: int, code: str) -> dict[str, Any]:
-        run = self.database.get_screener_run(user_id, run_id)
+        run = self.repository.get_screener_run(user_id, run_id)
         if not run:
-            run = self.database.get_screener_run(0, run_id)
+            run = self.repository.get_screener_run(0, run_id)
         if not run:
             raise ValueError("选股结果不存在或不属于当前账号。")
         normalized_code = str(code or "").strip().split(".")[0]
@@ -48,15 +48,15 @@ class StrategyTrackingService:
         return {"added": added, "tracking": self.list_tracking(user_id)}
 
     def remove_candidate(self, user_id: int, track_id: int) -> dict[str, Any]:
-        deleted = self.database.delete_strategy_track(user_id, track_id)
+        deleted = self.repository.delete_strategy_track(user_id, track_id)
         return {"deleted": deleted, "tracking": self.list_tracking(user_id)}
 
     def list_tracking(self, user_id: int, limit_batches: int = 12) -> dict[str, Any]:
-        tracks = self.database.list_strategy_tracks(user_id, limit_batches)
+        tracks = self.repository.list_strategy_tracks(user_id, limit_batches)
         if not tracks:
             return {"batches": [], "summary": self._summary([])}
 
-        bars = self.database.load_tracking_bars(
+        bars = self.repository.load_tracking_bars(
             [(item["ts_code"], item["selection_date"]) for item in tracks], 5
         )
         batches: dict[int, dict[str, Any]] = {}
diff --git a/tests/test_bootstrap_container.py b/tests/test_bootstrap_container.py
index ca547f7..032e7c6 100644
--- a/tests/test_bootstrap_container.py
+++ b/tests/test_bootstrap_container.py
@@ -42,9 +42,9 @@ class BootstrapContainerTests(unittest.TestCase):
             )
             self.assertIs(container.database, database)
             self.assertIs(container.screener.database, database)
-            self.assertIs(container.strategy_tracking.database, database)
-            self.assertIs(container.alert_service.database, database)
-            self.assertIs(container.trade_journal.database, database)
+            self.assertIs(container.strategy_tracking.repository.database, database)
+            self.assertIs(container.alert_service.repository.database, database)
+            self.assertIs(container.trade_journal.repository.database, database)
             self.assertIs(container.chart_data.ifind, container.ifind)
             self.assertTrue(container.ifind.configured)
 
diff --git a/tests/test_repository_boundaries.py b/tests/test_repository_boundaries.py
new file mode 100644
index 0000000..7427f4f
--- /dev/null
+++ b/tests/test_repository_boundaries.py
@@ -0,0 +1,54 @@
+from __future__ import annotations
+
+import tempfile
+import unittest
+from pathlib import Path
+
+from alert_service import AlertService
+from backend.bootstrap.container import build_application_container
+from backend.database.repositories import (
+    SQLiteAlertRepository,
+    SQLiteStrategyTrackingRepository,
+    SQLiteTradeJournalRepository,
+)
+from database import ReviewDatabase
+
+
+class RepositoryBoundaryTests(unittest.TestCase):
+    def setUp(self) -> None:
+        self.temporary = tempfile.TemporaryDirectory()
+        self.addCleanup(self.temporary.cleanup)
+        self.database = ReviewDatabase(Path(self.temporary.name) / "review.db")
+
+    def test_container_injects_narrow_user_repositories(self) -> None:
+        skills = Path(self.temporary.name) / "skills"
+        private = Path(self.temporary.name) / "private"
+        skills.mkdir()
+        private.mkdir()
+        container = build_application_container(self.database, {}, skills, private)
+        self.assertIsInstance(container.repositories.alerts, SQLiteAlertRepository)
+        self.assertIsInstance(container.repositories.trades, SQLiteTradeJournalRepository)
+        self.assertIsInstance(
+            container.repositories.strategy_tracking, SQLiteStrategyTrackingRepository
+        )
+        self.assertIs(container.alert_service.repository, container.repositories.alerts)
+        self.assertIs(container.trade_journal.repository, container.repositories.trades)
+
+    def test_private_repositories_reject_missing_account_owner(self) -> None:
+        alerts = SQLiteAlertRepository(self.database)
+        trades = SQLiteTradeJournalRepository(self.database)
+        tracking = SQLiteStrategyTrackingRepository(self.database)
+        with self.assertRaises(ValueError):
+            alerts.list_alerts(0, "20260729")
+        with self.assertRaises(ValueError):
+            trades.list_trade_entries(0)
+        with self.assertRaises(ValueError):
+            tracking.list_strategy_tracks(0)
+
+    def test_alert_service_keeps_database_compatible_structural_port(self) -> None:
+        service = AlertService(self.database)
+        self.assertIs(service.repository, self.database)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/trade_journal.py b/trade_journal.py
index b5de4bf..30fb54e 100644
--- a/trade_journal.py
+++ b/trade_journal.py
@@ -5,7 +5,7 @@ from datetime import date
 from typing import Any
 
 from app_config import normalize_date, validate_stock_code, validate_text
-from database import ReviewDatabase
+from backend.database.repositories import TradeJournalRepository
 
 
 TRADE_ACTIONS = {"buy": "买入", "sell": "卖出", "trim": "减仓", "add": "加仓", "watch": "观察"}
@@ -13,8 +13,8 @@ EMOTIONS = {"calm": "平静", "confident": "笃定", "hesitant": "犹豫", "anxi
 
 
 class TradeJournalService:
-    def __init__(self, database: ReviewDatabase) -> None:
-        self.database = database
+    def __init__(self, repository: TradeJournalRepository) -> None:
+        self.repository = repository
 
     def save(self, user_id: int, payload: dict[str, Any]) -> int:
         trade_id = int(payload.get("id") or 0)
@@ -40,7 +40,7 @@ class TradeJournalService:
         if not isinstance(raw_tags, list):
             raise ValueError("交易标签格式不正确。")
         tags = [validate_text(item, "交易标签", 20) for item in raw_tags if str(item).strip()][:8]
-        return self.database.save_trade_entry(
+        return self.repository.save_trade_entry(
             user_id, trade_date, code, name, action, price, quantity, position_pct,
             pnl_amount, pnl_pct, thesis, execution, emotion, tags, trade_id or None,
         )
@@ -53,7 +53,7 @@ class TradeJournalService:
         if start and start > end:
             raise ValueError("开始日期不能晚于结束日期。")
         code = validate_stock_code(code) if code else ""
-        items = self.database.list_trade_entries(user_id, start, end, code)
+        items = self.repository.list_trade_entries(user_id, start, end, code)
         for item in items:
             item["tags"] = json.loads(item.get("tags") or "[]")
             item["action_label"] = TRADE_ACTIONS.get(item["action"], item["action"])
@@ -61,6 +61,9 @@ class TradeJournalService:
         realized = [item for item in items if item.get("pnl_pct") is not None]
         return {"items": items, "summary": self._summary(items, realized)}
 
+    def delete(self, user_id: int, trade_id: int) -> bool:
+        return self.repository.delete_trade_entry(user_id, trade_id)
+
     @staticmethod
     def _summary(items: list[dict[str, Any]], realized: list[dict[str, Any]]) -> dict[str, Any]:
         pnl_amounts = [float(item["pnl_amount"]) for item in realized if item.get("pnl_amount") is not None]