diff --git a/docs/latest/changelog/roadmap.md b/docs/latest/changelog/roadmap.md
index a31c5c69..a7d0889c 100644
--- a/docs/latest/changelog/roadmap.md
+++ b/docs/latest/changelog/roadmap.md
@@ -14,6 +14,7 @@
 - 系统层面添加 apikey，在智能体、知识库调用中支持 apikey 以支持外部调用
 - 支持更多类型的文档源的导入功能
 - 检查非 Agent 场景下的知识库的可见情况
+- Tasker 新增删除任务的接口
 
 ### Bugs
 - 部分异常状态下，智能体的模型名称出现重叠[#279](https://github.com/xerrors/Yuxi-Know/issues/279)
diff --git a/scripts/migrate_kb_metadata_to_db.py b/scripts/migrate_kb_metadata_to_db.py
index 0498fd71..7229d70b 100644
--- a/scripts/migrate_kb_metadata_to_db.py
+++ b/scripts/migrate_kb_metadata_to_db.py
@@ -14,6 +14,7 @@ from src import config
 from src.repositories.evaluation_repository import EvaluationRepository
 from src.repositories.knowledge_base_repository import KnowledgeBaseRepository
 from src.repositories.knowledge_file_repository import KnowledgeFileRepository
+from src.repositories.task_repository import TaskRepository
 from src.utils import logger
 
 
@@ -64,7 +65,9 @@ async def rollback_all() -> None:
     eval_repo = EvaluationRepository()
     kb_repo = KnowledgeBaseRepository()
     file_repo = KnowledgeFileRepository()
+    task_repo = TaskRepository()
 
+    await task_repo.delete_all()
     await eval_repo.delete_all()
 
     rows = await kb_repo.get_all()
@@ -96,6 +99,7 @@ async def migrate(dry_run: bool, execute: bool, rollback: bool) -> None:
     kb_repo = KnowledgeBaseRepository()
     file_repo = KnowledgeFileRepository()
     eval_repo = EvaluationRepository()
+    task_repo = TaskRepository()
 
     kb_rows: list[dict[str, Any]] = []
     file_rows: list[tuple[str, dict[str, Any]]] = []
@@ -234,9 +238,13 @@ async def migrate(dry_run: bool, execute: bool, rollback: bool) -> None:
                         )
                     )
 
+    tasks_json_path = os.path.join(config.save_dir, "tasks", "tasks.json")
+    task_rows: list[dict[str, Any]] = _load_json(tasks_json_path).get("tasks", []) or []
+
     logger.info(
         f"Prepared: knowledge_bases={len(kb_rows)}, knowledge_files={len(file_rows)}, "
-        f"benchmarks={len(benchmark_rows)}, results={len(result_rows)}, result_details={len(result_detail_rows)}"
+        f"benchmarks={len(benchmark_rows)}, results={len(result_rows)}, result_details={len(result_detail_rows)}, "
+        f"tasks={len(task_rows)}"
     )
 
     if dry_run and not execute:
@@ -286,6 +294,31 @@ async def migrate(dry_run: bool, execute: bool, rollback: bool) -> None:
     for task_id, idx, data in result_detail_rows:
         await eval_repo.upsert_result_detail(task_id=task_id, query_index=idx, data=data)
 
+    for item in task_rows:
+        task_id = item.get("id")
+        if not task_id:
+            continue
+        payload = item.get("payload") or {}
+        result = item.get("result")
+        await task_repo.upsert(
+            task_id,
+            {
+                "name": item.get("name") or "Unnamed Task",
+                "type": item.get("type") or "general",
+                "status": item.get("status") or "pending",
+                "progress": float(item.get("progress") or 0.0),
+                "message": item.get("message") or "",
+                "payload": payload,
+                "result": result,
+                "error": item.get("error"),
+                "cancel_requested": 1 if item.get("cancel_requested") else 0,
+                "created_at": _utc_dt(item.get("created_at")),
+                "updated_at": _utc_dt(item.get("updated_at")) or _utc_dt(item.get("created_at")),
+                "started_at": _utc_dt(item.get("started_at")),
+                "completed_at": _utc_dt(item.get("completed_at")),
+            },
+        )
+
     logger.info("Migration completed")
 
 
diff --git a/server/routers/knowledge_router.py b/server/routers/knowledge_router.py
index 30921ea7..ae133301 100644
--- a/server/routers/knowledge_router.py
+++ b/server/routers/knowledge_router.py
@@ -10,7 +10,7 @@ from fastapi import APIRouter, Body, Depends, File, HTTPException, Query, Reques
 from fastapi.responses import FileResponse
 from starlette.responses import StreamingResponse
 
-from server.services.tasker import TaskContext, tasker
+from src.services.task_service import TaskContext, tasker
 from server.utils.auth_middleware import get_admin_user, get_required_user
 from src import config, knowledge_base
 from src.knowledge.indexing import SUPPORTED_FILE_EXTENSIONS, is_supported_file_extension, process_file_to_markdown
diff --git a/server/routers/task_router.py b/server/routers/task_router.py
index e6d87fee..848af3f9 100644
--- a/server/routers/task_router.py
+++ b/server/routers/task_router.py
@@ -1,7 +1,7 @@
 from fastapi import APIRouter, Depends, HTTPException, Query
 
 from src.storage.postgres.models_business import User
-from server.services.tasker import tasker
+from src.services.task_service import tasker
 from server.utils.auth_middleware import get_admin_user
 
 tasks = APIRouter(prefix="/tasks", tags=["tasks"])
diff --git a/server/services/__init__.py b/server/services/__init__.py
deleted file mode 100644
index 5bbcfe71..00000000
--- a/server/services/__init__.py
+++ /dev/null
@@ -1,3 +0,0 @@
-from .tasker import TaskContext, Tasker, tasker
-
-__all__ = ["TaskContext", "Tasker", "tasker"]
diff --git a/server/utils/lifespan.py b/server/utils/lifespan.py
index eb38bf13..175f9dca 100644
--- a/server/utils/lifespan.py
+++ b/server/utils/lifespan.py
@@ -2,7 +2,7 @@ from contextlib import asynccontextmanager
 
 from fastapi import FastAPI
 
-from server.services import tasker
+from src.services.task_service import tasker
 from src.services.mcp_service import init_mcp_servers
 from src.storage.postgres.manager import pg_manager
 from src.knowledge import knowledge_base
diff --git a/src/repositories/task_repository.py b/src/repositories/task_repository.py
new file mode 100644
index 00000000..8e8af1dd
--- /dev/null
+++ b/src/repositories/task_repository.py
@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+from typing import Any
+
+from sqlalchemy import delete, select
+
+from src.storage.postgres.manager import pg_manager
+from src.storage.postgres.models_business import TaskRecord
+
+
+class TaskRepository:
+    async def get_by_id(self, task_id: str) -> TaskRecord | None:
+        async with pg_manager.get_async_session_context() as session:
+            result = await session.execute(select(TaskRecord).where(TaskRecord.id == task_id))
+            return result.scalar_one_or_none()
+
+    async def list(self, status: str | None = None, limit: int = 100) -> list[TaskRecord]:
+        async with pg_manager.get_async_session_context() as session:
+            stmt = select(TaskRecord)
+            if status:
+                stmt = stmt.where(TaskRecord.status == status)
+            stmt = stmt.order_by(TaskRecord.created_at.desc()).limit(max(limit, 0))
+            result = await session.execute(stmt)
+            return list(result.scalars().all())
+
+    async def list_all(self) -> list[TaskRecord]:
+        async with pg_manager.get_async_session_context() as session:
+            result = await session.execute(select(TaskRecord).order_by(TaskRecord.created_at.desc()))
+            return list(result.scalars().all())
+
+    async def upsert(self, task_id: str, data: dict[str, Any]) -> TaskRecord:
+        async with pg_manager.get_async_session_context() as session:
+            result = await session.execute(select(TaskRecord).where(TaskRecord.id == task_id))
+            record = result.scalar_one_or_none()
+            if record is None:
+                record = TaskRecord(id=task_id, **data)
+                session.add(record)
+                return record
+            for key, value in data.items():
+                setattr(record, key, value)
+            return record
+
+    async def delete_all(self) -> None:
+        async with pg_manager.get_async_session_context() as session:
+            await session.execute(delete(TaskRecord))
+
diff --git a/src/services/evaluation_service.py b/src/services/evaluation_service.py
index b1dace53..6720facb 100644
--- a/src/services/evaluation_service.py
+++ b/src/services/evaluation_service.py
@@ -6,7 +6,7 @@ import uuid
 from datetime import datetime
 from typing import Any
 
-from server.services.tasker import TaskContext, tasker
+from src.services.task_service import TaskContext, tasker
 from src.knowledge import knowledge_base
 from src.models import select_model
 from src.repositories.evaluation_repository import EvaluationRepository
diff --git a/server/services/tasker.py b/src/services/task_service.py
similarity index 78%
rename from server/services/tasker.py
rename to src/services/task_service.py
index 1bdfdb35..a23b3dbd 100644
--- a/server/services/tasker.py
+++ b/src/services/task_service.py
@@ -1,23 +1,23 @@
 import asyncio
-import json
-import os
 import uuid
-from dataclasses import asdict, dataclass, field
-from pathlib import Path
-from typing import Any
-from collections.abc import Awaitable, Callable
 from collections import Counter
+from collections.abc import Awaitable, Callable
+from dataclasses import asdict, dataclass, field
+from datetime import datetime
+from typing import Any
 
-from src.config import config
+from src.repositories.task_repository import TaskRepository
+from src.utils.datetime_utils import coerce_any_to_utc_datetime, utc_isoformat
 from src.utils.logging_config import logger
-from src.utils.datetime_utils import utc_isoformat
 
 TaskCoroutine = Callable[["TaskContext"], Awaitable[Any]]
 TERMINAL_STATUSES = {"success", "failed", "cancelled"}
 
 
-def _utc_timestamp() -> str:
-    return utc_isoformat()
+def _iso_to_utc_naive(value: str | None) -> datetime | None:
+    if not value:
+        return None
+    return coerce_any_to_utc_datetime(value).replace(tzinfo=None)
 
 
 @dataclass
@@ -28,8 +28,8 @@ class Task:
     status: str = "pending"
     progress: float = 0.0
     message: str = ""
-    created_at: str = field(default_factory=_utc_timestamp)
-    updated_at: str = field(default_factory=_utc_timestamp)
+    created_at: str = field(default_factory=utc_isoformat)
+    updated_at: str = field(default_factory=utc_isoformat)
     started_at: str | None = None
     completed_at: str | None = None
     payload: dict[str, Any] = field(default_factory=dict)
@@ -38,8 +38,7 @@ class Task:
     cancel_requested: bool = False
 
     def to_dict(self) -> dict[str, Any]:
-        data = asdict(self)
-        return data
+        return asdict(self)
 
     def to_summary_dict(self) -> dict[str, Any]:
         data = asdict(self)
@@ -56,8 +55,8 @@ class Task:
             status=data.get("status", "pending"),
             progress=data.get("progress", 0.0),
             message=data.get("message", ""),
-            created_at=data.get("created_at", _utc_timestamp()),
-            updated_at=data.get("updated_at", _utc_timestamp()),
+            created_at=data.get("created_at", utc_isoformat()),
+            updated_at=data.get("updated_at", utc_isoformat()),
             started_at=data.get("started_at"),
             completed_at=data.get("completed_at"),
             payload=data.get("payload", {}),
@@ -100,9 +99,8 @@ class Tasker:
         self._tasks: dict[str, Task] = {}
         self._lock = asyncio.Lock()
         self._workers: list[asyncio.Task[Any]] = []
-        self._storage_path = Path(config.save_dir) / "tasks" / "tasks.json"
-        os.makedirs(self._storage_path.parent, exist_ok=True)
         self._started = False
+        self._repo = TaskRepository()
 
     async def start(self) -> None:
         async with self._lock:
@@ -123,7 +121,6 @@ class Tasker:
                 worker.cancel()
             await asyncio.gather(*self._workers, return_exceptions=True)
             self._workers.clear()
-            await self._persist_state()
             self._started = False
             logger.info("Tasker shutdown complete")
 
@@ -139,7 +136,7 @@ class Tasker:
         task = Task(id=task_id, name=name, type=task_type, payload=payload or {})
         async with self._lock:
             self._tasks[task_id] = task
-            await self._persist_state()
+            await self._persist_task(task)
             await self._queue.put((task_id, coroutine))
         logger.info("Enqueued task {} ({})", task_id, name)
         return task
@@ -180,11 +177,11 @@ class Tasker:
             task = self._tasks.get(task_id)
             if not task:
                 return False
-            if task.status in {"success", "failed", "cancelled"}:
+            if task.status in TERMINAL_STATUSES:
                 return False
             task.cancel_requested = True
-            task.updated_at = _utc_timestamp()
-            await self._persist_state()
+            task.updated_at = utc_isoformat()
+            await self._persist_task(task)
         logger.info("Cancellation requested for task {}", task_id)
         return True
 
@@ -200,7 +197,7 @@ class Tasker:
                         await self._mark_cancelled(task_id, "Task was cancelled before execution")
                         continue
                     await self._update_task(
-                        task_id, status="running", progress=0.0, message="任务开始执行", started_at=_utc_timestamp()
+                        task_id, status="running", progress=0.0, message="任务开始执行", started_at=utc_isoformat()
                     )
                     context = TaskContext(self, task_id)
                     try:
@@ -214,7 +211,7 @@ class Tasker:
                             progress=100.0,
                             message="任务已完成",
                             result=result,
-                            completed_at=_utc_timestamp(),
+                            completed_at=utc_isoformat(),
                         )
                     except asyncio.CancelledError:
                         await self._mark_cancelled(task_id, "任务被取消")
@@ -226,7 +223,7 @@ class Tasker:
                             progress=100.0,
                             message="任务执行失败",
                             error=str(exc),
-                            completed_at=_utc_timestamp(),
+                            completed_at=utc_isoformat(),
                         )
                 finally:
                     self._queue.task_done()
@@ -245,7 +242,7 @@ class Tasker:
             status="cancelled",
             progress=100.0,
             message=message,
-            completed_at=_utc_timestamp(),
+            completed_at=utc_isoformat(),
         )
 
     async def _update_task(
@@ -278,52 +275,55 @@ class Tasker:
                 task.started_at = started_at
             if completed_at is not None:
                 task.completed_at = completed_at
-            task.updated_at = _utc_timestamp()
-            await self._persist_state()
+            task.updated_at = utc_isoformat()
+            await self._persist_task(task)
 
     def _is_cancel_requested(self, task_id: str) -> bool:
         task = self._tasks.get(task_id)
         return bool(task and task.cancel_requested)
 
     async def _load_state(self) -> None:
-        if not self._storage_path.exists():
-            return
-        try:
-            content = await asyncio.to_thread(self._storage_path.read_text, encoding="utf-8")
-            if not content.strip():
-                return
-            data = json.loads(content)
-            tasks = data.get("tasks", [])
-            for item in tasks:
-                task = Task.from_dict(item)
-                if task.status == "running":
-                    task.status = "failed"
-                    task.message = "服务重启时任务中断"
-                    task.updated_at = _utc_timestamp()
-                elif task.status not in TERMINAL_STATUSES:
-                    task.status = "failed"
-                    task.message = "服务重启时任务未继续执行"
-                    task.updated_at = _utc_timestamp()
-                self._tasks[task.id] = task
-            logger.info("Loaded {} task records from storage", len(tasks))
-        except Exception as exc:  # noqa: BLE001
-            logger.exception("Failed to load task state: {}", exc)
+        records = await self._repo.list_all()
+        updated: list[Task] = []
+        for record in records:
+            task = Task.from_dict(record.to_dict())
+            if task.status == "running":
+                task.status = "failed"
+                task.message = "服务重启时任务中断"
+                task.updated_at = utc_isoformat()
+                updated.append(task)
+            elif task.status not in TERMINAL_STATUSES:
+                task.status = "failed"
+                task.message = "服务重启时任务未继续执行"
+                task.updated_at = utc_isoformat()
+                updated.append(task)
+            self._tasks[task.id] = task
+        for task in updated:
+            await self._persist_task(task)
+        if records:
+            logger.info("Loaded {} task records from storage", len(records))
 
-    async def _persist_state(self) -> None:
-        tasks = [task.to_dict() for task in self._tasks.values()]
-        payload = {"tasks": tasks, "updated_at": _utc_timestamp()}
-
-        def _write() -> None:
-            self._storage_path.parent.mkdir(parents=True, exist_ok=True)
-            tmp_path = self._storage_path.with_suffix(".tmp")
-            with open(tmp_path, "w", encoding="utf-8") as fh:
-                json.dump(payload, fh, ensure_ascii=False, indent=2)
-            os.replace(tmp_path, self._storage_path)
-
-        await asyncio.to_thread(_write)
+    async def _persist_task(self, task: Task) -> None:
+        data: dict[str, Any] = {
+            "name": task.name,
+            "type": task.type,
+            "status": task.status,
+            "progress": task.progress,
+            "message": task.message,
+            "payload": task.payload,
+            "result": task.result,
+            "error": task.error,
+            "cancel_requested": 1 if task.cancel_requested else 0,
+            "created_at": _iso_to_utc_naive(task.created_at),
+            "updated_at": _iso_to_utc_naive(task.updated_at),
+            "started_at": _iso_to_utc_naive(task.started_at),
+            "completed_at": _iso_to_utc_naive(task.completed_at),
+        }
+        await self._repo.upsert(task.id, data)
 
 
 tasker = Tasker()
 
 
 __all__ = ["tasker", "TaskContext", "Tasker"]
+
diff --git a/src/storage/postgres/models_business.py b/src/storage/postgres/models_business.py
index 79fc733b..1aaa0419 100644
--- a/src/storage/postgres/models_business.py
+++ b/src/storage/postgres/models_business.py
@@ -2,7 +2,7 @@
 
 from typing import Any
 
-from sqlalchemy import JSON, Column, DateTime, ForeignKey, Integer, String, Text
+from sqlalchemy import JSON, Column, DateTime, Float, ForeignKey, Integer, String, Text
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import relationship
 
@@ -374,3 +374,46 @@ class MCPServer(Base):
         if self.disabled_tools:
             config["disabled_tools"] = self.disabled_tools
         return config
+
+
+class TaskRecord(Base):
+    __tablename__ = "tasks"
+
+    id = Column(String(32), primary_key=True)
+    name = Column(String(255), nullable=False)
+    type = Column(String(64), nullable=False, index=True)
+    status = Column(String(32), nullable=False, default="pending", index=True)
+    progress = Column(Float, nullable=False, default=0.0)
+    message = Column(Text, nullable=False, default="")
+    payload = Column(JSON, nullable=True)
+    result = Column(JSON, nullable=True)
+    error = Column(Text, nullable=True)
+    cancel_requested = Column(Integer, nullable=False, default=0)
+    created_at = Column(DateTime, default=utc_now_naive, index=True)
+    updated_at = Column(DateTime, default=utc_now_naive, onupdate=utc_now_naive)
+    started_at = Column(DateTime, nullable=True)
+    completed_at = Column(DateTime, nullable=True)
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "id": self.id,
+            "name": self.name,
+            "type": self.type,
+            "status": self.status,
+            "progress": self.progress,
+            "message": self.message,
+            "created_at": format_utc_datetime(self.created_at),
+            "updated_at": format_utc_datetime(self.updated_at),
+            "started_at": format_utc_datetime(self.started_at),
+            "completed_at": format_utc_datetime(self.completed_at),
+            "payload": self.payload or {},
+            "result": self.result,
+            "error": self.error,
+            "cancel_requested": bool(self.cancel_requested),
+        }
+
+    def to_summary_dict(self) -> dict[str, Any]:
+        data = self.to_dict()
+        data.pop("payload", None)
+        data.pop("result", None)
+        return data