diff --git a/app/chain/_transfer.py b/app/chain/_transfer.py
index fe41c91f2..6cdcaad61 100644
--- a/app/chain/_transfer.py
+++ b/app/chain/_transfer.py
@@ -23,8 +23,8 @@ from app.chain.media import MediaChain
 from app.chain.storage import StorageChain
 from app.chain.subscribe import SubscribeChain
 from app.application.chain.data import (
-    DownloadHistoryPortProxy as DownloadHistoryOper,
-    TransferHistoryPortProxy as TransferHistoryOper,
+    get_chain_download_history_port,
+    get_chain_transfer_history_port,
 )
 from app.application.configuration import (
     get_chain_runtime_config_snapshot,
@@ -417,7 +417,7 @@ class FileFilterMixin:
 
     @staticmethod
     def _is_overwrite_declined(task: TransferTask, transferinfo: TransferInfo,
-                               transferhis: TransferHistoryOper) -> bool:
+                               transferhis: Any) -> bool:
         """
         判断本次未入库是否为「同路径已有成功记录 + 覆盖模式裁定不覆盖」。
 
@@ -859,7 +859,7 @@ class HistoryMatchMixin:
 
     def _resolve_history_from_download_files(
             self,
-            downloadhis: DownloadHistoryOper,
+            downloadhis: Any,
             download_files: List[DownloadFiles],
             file_path: Optional[Path] = None,
             save_path: Optional[Path] = None,
@@ -889,7 +889,7 @@ class HistoryMatchMixin:
 
     def _resolve_download_history(
             self,
-            downloadhis: DownloadHistoryOper,
+            downloadhis: Any,
             file_path: Path,
             bluray_dir: bool = False,
             download_hash: Optional[str] = None,
@@ -1148,7 +1148,7 @@ class ManualHistoryMixin:
     def _get_manual_transfer_history(
             self,
             fileitem: FileItem,
-            transfer_history_oper: TransferHistoryOper,
+            transfer_history_oper: Any,
             include_move_dest: bool = False,
     ) -> Optional[TransferHistory]:
         """查询文件源路径历史，并兼容从成功移动后的目标现址重新整理。"""
@@ -1178,7 +1178,7 @@ class ManualHistoryMixin:
         :param fileitems: 待查询的文件或目录项
         :return: 去重后的成功整理记录
         """
-        transfer_history_oper = TransferHistoryOper()
+        transfer_history_oper = get_chain_transfer_history_port()
         histories: Dict[int, TransferHistory] = {}
         for fileitem in fileitems or []:
             if not fileitem or not fileitem.path:
@@ -1212,7 +1212,7 @@ class ManualHistoryMixin:
     @staticmethod
     def _delete_manual_transfer_history(
             history: TransferHistory,
-            transfer_history_oper: TransferHistoryOper,
+            transfer_history_oper: Any,
     ) -> Tuple[bool, str]:
         """删除手动重整历史；非成功移动记录同时清理可能存在的旧目标。"""
         if (
@@ -1385,7 +1385,7 @@ class FailedRetryMixin:
             )
             return
 
-        history = TransferHistoryOper().get(history_id)
+        history = get_chain_transfer_history_port().get(history_id)
         if not history:
             self.post_message(
                 Message(
@@ -1478,7 +1478,7 @@ class FailedRetryMixin:
         :param media_id: 数据源原生 ID，必须与 media_source 成对提供
         """
         # 查询历史记录
-        history: TransferHistory = TransferHistoryOper().get(logid)
+        history: TransferHistory = get_chain_transfer_history_port().get(logid)
         if not history:
             logger.error(f"整理记录不存在，ID：{logid}")
             return False, "整理记录不存在"
diff --git a/app/chain/transfer.py b/app/chain/transfer.py
index 9aa6f837c..0132d514f 100755
--- a/app/chain/transfer.py
+++ b/app/chain/transfer.py
@@ -23,9 +23,9 @@ from app.domain.meta.metabase import MetaBase
 from app.domain.meta.metamusic import MetaMusic
 from app.domain.metainfo import MetaInfoPath
 from app.application.chain.data import (
-    DownloadHistoryPortProxy as DownloadHistoryOper,
-    TransferPendingPortProxy as TransferPendingOper,
-    TransferHistoryPortProxy as TransferHistoryOper,
+    get_chain_download_history_port,
+    get_chain_transfer_history_port,
+    get_chain_transfer_pending_port,
 )
 DownloadHistory = Any
 from app.application.configuration import get_configured_system_config
@@ -142,7 +142,7 @@ class TransferChain(FileFilterMixin, ScrapeBatchMixin, EpisodeFormatMixin, Histo
         # 整理失败通知聚合器
         self.failure_notification_aggregator = TransferFailureNotificationAggregator()
         # 待整理文件落盘登记，用于进程重启后回放内存队列里未完成的任务
-        self._pendingoper = TransferPendingOper()
+        self._pendingoper = get_chain_transfer_pending_port()
         # 转移成功的文件清单
         self._success_target_files: Dict[Tuple, List[str]] = {}
         # 批次级刮削缓冲，避免同一批多文件入库重复触发目录刮削
@@ -419,7 +419,7 @@ class TransferChain(FileFilterMixin, ScrapeBatchMixin, EpisodeFormatMixin, Histo
                     username=task.username,
                 )
 
-        transferhis = TransferHistoryOper()
+        transferhis = get_chain_transfer_history_port()
         target_dir_path = self.__get_transfer_target_dir_path(transferinfo)
         job_id = self.jobview.get_job_id(task)
 
@@ -1265,7 +1265,7 @@ class TransferChain(FileFilterMixin, ScrapeBatchMixin, EpisodeFormatMixin, Histo
         """
         try:
             # 识别
-            transferhis = TransferHistoryOper()
+            transferhis = get_chain_transfer_history_port()
             # 显式标注联合：下面既会赋回音乐识别结果（MusicInfo），也会赋回影视识别
             # 结果（MediaInfo），不标注时会被推断成其中一种，另一种就成了假错误
             mediainfo: Optional[Union[MediaInfo, MusicInfo]] = task.mediainfo
@@ -1647,7 +1647,7 @@ class TransferChain(FileFilterMixin, ScrapeBatchMixin, EpisodeFormatMixin, Histo
                         continue
 
                     # 查询下载记录识别情况
-                    downloadhis: DownloadHistory = DownloadHistoryOper().get_by_hash(
+                    downloadhis: DownloadHistory = get_chain_download_history_port().get_by_hash(
                         torrent.hash
                     )
                     # 下载记录中的媒体类型作为整理类型来源，无下载记录时留空由文件后缀兜底
@@ -2265,7 +2265,7 @@ class TransferChain(FileFilterMixin, ScrapeBatchMixin, EpisodeFormatMixin, Histo
         def _build_main_meta(
                 main_fileitem: FileItem,
                 main_bluray_dir: bool,
-                download_history_oper: DownloadHistoryOper,
+                download_history_oper: Any,
         ) -> Optional[MetaBase]:
             """
             构建主视频元数据。
@@ -2357,7 +2357,7 @@ class TransferChain(FileFilterMixin, ScrapeBatchMixin, EpisodeFormatMixin, Histo
             if not items:
                 return [], {}
 
-            download_history_oper = DownloadHistoryOper()
+            download_history_oper = get_chain_download_history_port()
             inherited_map: Dict[Tuple[str, str], MetaBase] = {}
             main_items_by_dir, extra_items_by_dir = _build_directory_index(items)
             main_items = [
@@ -2557,7 +2557,7 @@ class TransferChain(FileFilterMixin, ScrapeBatchMixin, EpisodeFormatMixin, Histo
                 # 成功但源文件已变化放行交 overwrite_mode 决断）；手动整理可清理失败记录，
                 # 或按用户确认清理成功记录。
                 if (not force or reorganize) and not preview:
-                    transfer_history_oper = TransferHistoryOper()
+                    transfer_history_oper = get_chain_transfer_history_port()
                     transferd = self._get_manual_transfer_history(
                         fileitem=file_item,
                         transfer_history_oper=transfer_history_oper,
@@ -2627,7 +2627,7 @@ class TransferChain(FileFilterMixin, ScrapeBatchMixin, EpisodeFormatMixin, Histo
                             continue
 
                 # 提前获取下载历史，以便获取自定义识别词
-                downloadhis = DownloadHistoryOper()
+                downloadhis = get_chain_download_history_port()
                 download_history = self._resolve_download_history(
                     downloadhis=downloadhis,
                     file_path=file_path,
diff --git a/docs/refactor/backend-architecture-next-stage.md b/docs/refactor/backend-architecture-next-stage.md
index 3f5acfb75..e76bfb72c 100644
--- a/docs/refactor/backend-architecture-next-stage.md
+++ b/docs/refactor/backend-architecture-next-stage.md
@@ -6,7 +6,7 @@
 > 审计范围：宿主后端；排除 `app/plugins/**` 运行时插件副本
 > 规范优先级：`AGENTS.md` 与 `docs/rules/` 高于本文
 > 相关文档：`docs/architecture-overview.md`、`docs/refactor/backend-architecture-governance.md`、`docs/refactor/backend-module-refactor-compatibility.md`
-> 实施进度：阶段 0～6 的宿主架构能力已完成收口；API/Application 公共复杂度基线已清零，启动组合根的 SystemConfigOper 构造点已由 14 降至 1；API 进程内后台任务已完成首批统一登记，插件仓适配和 Outbox 外围扩展仍按风险切片推进。Model/Base 查询与写装饰器、legacy 隐式会话外壳均已清零，插件 SDK 也不再导出宿主 Model。2026-08-23 的长期整改阶段 0 已恢复宿主、启动性能、官方插件和 SDK 契约门禁的可信基线；阶段 1a 已补齐 TaskRegistry owner 零债务门禁和诚实的关停超时语义；阶段 1b1 已收口整理 worker、pending 回放、失败通知、进程内 AI 重试、插件监控与事件投递的生命周期所有权；2026-08-24 的阶段 2 已将 212 个已观察宿主模块方法的 legacy aggregation 清零，并补齐可执行 fanout 与下载器文件 DTO 边界；阶段 3 已将消息交互和远程命令的订阅删除统一到 Application/UoW/outbox，宿主不再调用裸线程统计入口；阶段 4 已统一七种消息渠道的宿主回环与后台执行边界；阶段 5 已补齐事件窗口聚合任务的生命周期所有权；阶段 6 已统一插件文件操作的取消完成语义；阶段 7 已统一插件协程补偿的终态等待；阶段 8 已统一宿主同步函数的异步线程池入口；阶段 9 已统一工作流运行时的宿主获取路径；阶段 10 已统一模块、插件与调度运行时的显式 getter 调用；阶段 11 已清除系统配置 getter 的 Oper 形别名；阶段 12 已完成工作流域的显式 Chain 数据端口迁移；阶段 13 已收口用户、交互与消息链的数据端口；阶段 14 已收口音乐订阅数据端口；阶段 15 已收口站点数据端口；阶段 16 已收口媒体服务器数据端口；阶段 17 已收口下载数据端口；阶段 18 已收口主订阅数据端口。
+> 实施进度：阶段 0～6 的宿主架构能力已完成收口；API/Application 公共复杂度基线已清零，启动组合根的 SystemConfigOper 构造点已由 14 降至 1；API 进程内后台任务已完成首批统一登记，插件仓适配和 Outbox 外围扩展仍按风险切片推进。Model/Base 查询与写装饰器、legacy 隐式会话外壳均已清零，插件 SDK 也不再导出宿主 Model。2026-08-23 的长期整改阶段 0 已恢复宿主、启动性能、官方插件和 SDK 契约门禁的可信基线；阶段 1a 已补齐 TaskRegistry owner 零债务门禁和诚实的关停超时语义；阶段 1b1 已收口整理 worker、pending 回放、失败通知、进程内 AI 重试、插件监控与事件投递的生命周期所有权；2026-08-24 的阶段 2 已将 212 个已观察宿主模块方法的 legacy aggregation 清零，并补齐可执行 fanout 与下载器文件 DTO 边界；阶段 3 已将消息交互和远程命令的订阅删除统一到 Application/UoW/outbox，宿主不再调用裸线程统计入口；阶段 4 已统一七种消息渠道的宿主回环与后台执行边界；阶段 5 已补齐事件窗口聚合任务的生命周期所有权；阶段 6 已统一插件文件操作的取消完成语义；阶段 7 已统一插件协程补偿的终态等待；阶段 8 已统一宿主同步函数的异步线程池入口；阶段 9 已统一工作流运行时的宿主获取路径；阶段 10 已统一模块、插件与调度运行时的显式 getter 调用；阶段 11 已清除系统配置 getter 的 Oper 形别名；阶段 12 已完成工作流域的显式 Chain 数据端口迁移；阶段 13 已收口用户、交互与消息链的数据端口；阶段 14 已收口音乐订阅数据端口；阶段 15 已收口站点数据端口；阶段 16 已收口媒体服务器数据端口；阶段 17 已收口下载数据端口；阶段 18 已收口主订阅数据端口；阶段 19 已收口整理数据端口。
 
 ## 当前复核结论（2026-08-24）
 
@@ -203,6 +203,15 @@
 - 兼容边界不变：三个 DB Oper、Proxy 类、订阅 Chain 公开方法、订阅字段和事件合同、V2/V3 插件调用
   方式均未修改。
 
+### 长期整改阶段 19：整理 Chain 数据端口收口（2026-08-24）
+
+- `TransferChain` 与 `_transfer` mixin 原先把 pending、下载历史和整理历史三个 `*PortProxy` 别名为
+  数据库 Oper；现在 worker 回放、查重、历史解析、手动重整和失败重试统一调用对应 `get_chain_*_port()`。
+- 整理主流程、同步附属文件、音乐整理和手动历史测试改为替换命名 getter；架构门禁同时覆盖主链和
+  mixin，禁止重新引入三个 Proxy。
+- 兼容边界不变：三个 DB Oper、Proxy 类、整理公开入口、队列和生命周期、历史字段、事件 payload 以及
+  V2/V3 插件调用方式均未修改。
+
 ### 总体判断
 
 当前架构总体合理，已经从跨层混合的遗留单体收敛为**边界清晰的模块化单体**：
diff --git a/docs/rules/05-architecture.md b/docs/rules/05-architecture.md
index cb77c09d4..34654e36c 100644
--- a/docs/rules/05-architecture.md
+++ b/docs/rules/05-architecture.md
@@ -131,7 +131,7 @@ Session. `app/db/adapters/` is the concrete persistence-adapter layer: it may
 depend on Application-owned Protocols, UoW/Session and Oper implementations.
 This deliberate dependency inversion is the only `DB implementation ->
 Application contract` direction; Application must remain free of DB imports.
-Migrated workflow, user, interaction, messaging, music, site, media-server, download and subscribe
+Migrated workflow, user, interaction, messaging, music, site, media-server, download, subscribe and transfer
 Chain consumers use the named `get_chain_*_port()` functions from
 `app/application/chain/data.py`; they must not alias migration-time `*PortProxy`
 classes back to database Oper names. Those proxy classes remain compatibility
diff --git a/tests/test_architecture_dependencies.py b/tests/test_architecture_dependencies.py
index d16369c11..6ed361531 100644
--- a/tests/test_architecture_dependencies.py
+++ b/tests/test_architecture_dependencies.py
@@ -543,6 +543,31 @@ def test_subscribe_chain_uses_explicit_data_port_getters():
     assert violations == []
 
 
+def test_transfer_chains_use_explicit_data_port_getters():
+    """整理主链与 mixin 不得把迁移期 PortProxy 伪装成数据库 Oper。"""
+    paths = [APP_ROOT / "chain" / "transfer.py", APP_ROOT / "chain" / "_transfer.py"]
+    forbidden = {
+        "DownloadHistoryPortProxy",
+        "TransferHistoryPortProxy",
+        "TransferPendingPortProxy",
+    }
+    violations: list[str] = []
+    for path in paths:
+        tree = ast.parse(path.read_text(encoding="utf-8-sig"), filename=str(path))
+        for node in ast.walk(tree):
+            if not isinstance(node, ast.ImportFrom):
+                continue
+            if node.module != "app.application.chain.data":
+                continue
+            for alias in node.names:
+                if alias.name in forbidden:
+                    violations.append(
+                        f"{path.relative_to(PROJECT_ROOT).as_posix()}:{node.lineno}:{alias.name}"
+                    )
+
+    assert violations == []
+
+
 def test_plugin_components_do_not_reexport_legacy_abi_names():
     """新插件组件只提供 canonical 能力，不得复制旧 Helper、Manager 或 Oper 导出。"""
     violations: list[str] = []
diff --git a/tests/test_manual_transfer_history.py b/tests/test_manual_transfer_history.py
index 9e5d90c27..a97986c8b 100644
--- a/tests/test_manual_transfer_history.py
+++ b/tests/test_manual_transfer_history.py
@@ -59,12 +59,12 @@ def _patch_transfer_planning(monkeypatch, chain, fileitem, history, planned, del
         delete=lambda history_id: deleted.append(("history", history_id)),
     )
     monkeypatch.setattr(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         lambda: history_oper,
     )
-    monkeypatch.setattr("app.chain._transfer.TransferHistoryOper", lambda: history_oper)
+    monkeypatch.setattr("app.chain._transfer.get_chain_transfer_history_port", lambda: history_oper)
     monkeypatch.setattr(
-        "app.chain.transfer.DownloadHistoryOper",
+        "app.chain.transfer.get_chain_download_history_port",
         lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
@@ -72,7 +72,7 @@ def _patch_transfer_planning(monkeypatch, chain, fileitem, history, planned, del
             get_by_path=lambda path: None,
         ),
     )
-    monkeypatch.setattr("app.chain._transfer.DownloadHistoryOper", lambda: SimpleNamespace(
+    monkeypatch.setattr("app.chain._transfer.get_chain_download_history_port", lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
             get_files_by_savepath=lambda savepath: [],
diff --git a/tests/test_music_transfer.py b/tests/test_music_transfer.py
index d0825c375..521372351 100644
--- a/tests/test_music_transfer.py
+++ b/tests/test_music_transfer.py
@@ -535,10 +535,10 @@ def test_success_file_aggregation_is_isolated_between_music_jobs_in_same_directo
         )
 
     monkeypatch.setattr(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         lambda: SimpleNamespace(),
     )
-    monkeypatch.setattr("app.chain._transfer.TransferHistoryOper", lambda: SimpleNamespace())
+    monkeypatch.setattr("app.chain._transfer.get_chain_transfer_history_port", lambda: SimpleNamespace())
     monkeypatch.setattr(
         "app.chain.transfer.add_transfer_success",
         lambda **kwargs: SimpleNamespace(id=1),
@@ -767,8 +767,8 @@ def test_downloader_process_forwards_music_history_type(tmp_path, monkeypatch):
         ],
     )
     monkeypatch.setattr(
-        "app.chain.transfer.DownloadHistoryOper.get_by_hash",
-        lambda _, download_hash: history,
+        "app.chain.transfer.get_chain_download_history_port",
+        lambda: SimpleNamespace(get_by_hash=lambda download_hash: history),
     )
     monkeypatch.setattr(
         chain,
diff --git a/tests/test_transfer_failed_retry_buttons.py b/tests/test_transfer_failed_retry_buttons.py
index 41a504421..139bf813d 100644
--- a/tests/test_transfer_failed_retry_buttons.py
+++ b/tests/test_transfer_failed_retry_buttons.py
@@ -137,7 +137,7 @@ class TestTransferFailedRetryButtons(unittest.TestCase):
             settings, "AI_AGENT_ENABLE", True
         ):
             with patch(
-                "app.chain._transfer.TransferHistoryOper"
+                "app.chain._transfer.get_chain_transfer_history_port"
             ) as history_oper_cls, patch(
                 "app.chain._transfer.build_manual_redo_prompt",
                 return_value="retry transfer prompt",
@@ -217,7 +217,7 @@ class TestTransferFailedRetryButtons(unittest.TestCase):
             settings, "AI_AGENT_ENABLE", True
         ):
             with patch(
-                "app.chain._transfer.TransferHistoryOper"
+                "app.chain._transfer.get_chain_transfer_history_port"
             ) as history_oper_cls, patch(
                 "app.chain._transfer.build_manual_redo_prompt",
                 side_effect=build_manual_redo_prompt,
diff --git a/tests/test_transfer_job_manager.py b/tests/test_transfer_job_manager.py
index 390ec1a8d..2c99a7741 100644
--- a/tests/test_transfer_job_manager.py
+++ b/tests/test_transfer_job_manager.py
@@ -426,7 +426,7 @@ class TransferJobManagerTest(unittest.TestCase):
         )
 
         with patch(
-            "app.chain.transfer.TransferHistoryOper", return_value=SimpleNamespace()
+            "app.chain.transfer.get_chain_transfer_history_port", return_value=SimpleNamespace()
         ), patch(
             "app.chain.transfer.add_transfer_success",
             lambda **kwargs: SimpleNamespace(id=1),
@@ -472,8 +472,8 @@ class TransferJobManagerTest(unittest.TestCase):
         )
         system_config_oper = SimpleNamespace(get=lambda key: None)
 
-        with patch("app.chain.transfer.TransferHistoryOper", return_value=transfer_history_oper), \
-                patch("app.chain.transfer.DownloadHistoryOper", return_value=download_history_oper), \
+        with patch("app.chain.transfer.get_chain_transfer_history_port", return_value=transfer_history_oper), \
+                patch("app.chain.transfer.get_chain_download_history_port", return_value=download_history_oper), \
                 patch("app.chain.transfer.get_configured_system_config", return_value=system_config_oper), \
                 patch("app.chain.transfer.MetaInfoPath", lambda *args, **kwargs: FakeMeta(14)):
             state, errmsg = chain.do_transfer(
@@ -647,7 +647,7 @@ class TransferJobManagerTest(unittest.TestCase):
         system_config_oper = SimpleNamespace(get=lambda key: None)
 
         with patch(
-            "app.chain.transfer.TransferHistoryOper",
+            "app.chain.transfer.get_chain_transfer_history_port",
             return_value=transfer_history_oper,
         ), patch(
             "app.chain.transfer.get_configured_system_config",
@@ -715,10 +715,10 @@ class TransferJobManagerTest(unittest.TestCase):
         _reset_failed_retries(fileitem.path, fileitem.storage)
         try:
             with patch(
-                "app.chain.transfer.TransferHistoryOper",
+                "app.chain.transfer.get_chain_transfer_history_port",
                 return_value=transfer_history_oper,
             ), patch(
-                "app.chain.transfer.DownloadHistoryOper",
+                "app.chain.transfer.get_chain_download_history_port",
                 return_value=download_history_oper,
             ), patch(
                 "app.chain.transfer.get_configured_system_config",
@@ -794,10 +794,10 @@ class TransferJobManagerTest(unittest.TestCase):
             ):
                 record_transfer_failure(fileitem.path, fileitem.storage)
                 with patch(
-                    "app.chain.transfer.TransferHistoryOper",
+                    "app.chain.transfer.get_chain_transfer_history_port",
                     return_value=transfer_history_oper,
                 ), patch(
-                    "app.chain.transfer.DownloadHistoryOper",
+                    "app.chain.transfer.get_chain_download_history_port",
                     return_value=download_history_oper,
                 ), patch(
                     "app.chain.transfer.get_configured_system_config",
@@ -850,7 +850,7 @@ class TransferJobManagerTest(unittest.TestCase):
             )
             failed_history_oper = SimpleNamespace()
             with patch(
-                "app.chain.transfer.TransferHistoryOper",
+                "app.chain.transfer.get_chain_transfer_history_port",
                 return_value=failed_history_oper,
             ), patch(
                 "app.chain.transfer.add_transfer_fail",
@@ -890,7 +890,7 @@ class TransferJobManagerTest(unittest.TestCase):
                 need_notify=False,
             )
             with patch(
-                "app.chain.transfer.TransferHistoryOper", return_value=SimpleNamespace()
+                "app.chain.transfer.get_chain_transfer_history_port", return_value=SimpleNamespace()
             ), patch(
                 "app.chain.transfer.add_transfer_success",
                 lambda **kwargs: SimpleNamespace(id=2),
@@ -920,7 +920,7 @@ class TransferJobManagerTest(unittest.TestCase):
         transfer_history_oper = SimpleNamespace()
 
         with patch(
-            "app.chain.transfer.TransferHistoryOper",
+            "app.chain.transfer.get_chain_transfer_history_port",
             return_value=transfer_history_oper,
         ), patch(
             "app.chain.transfer.add_transfer_fail",
@@ -962,7 +962,7 @@ class TransferJobManagerTest(unittest.TestCase):
         self.assertTrue(chain.jobview.add_task(task))
 
         with patch(
-            "app.chain.transfer.TransferHistoryOper",
+            "app.chain.transfer.get_chain_transfer_history_port",
             return_value=SimpleNamespace(),
         ), patch(
             "app.chain.transfer.add_transfer_fail",
@@ -1005,7 +1005,7 @@ class TransferJobManagerTest(unittest.TestCase):
         self.assertTrue(chain.jobview.add_task(task))
 
         with patch(
-            "app.chain.transfer.TransferHistoryOper",
+            "app.chain.transfer.get_chain_transfer_history_port",
             return_value=SimpleNamespace(),
         ), patch(
             "app.chain.transfer.add_transfer_fail",
@@ -1081,10 +1081,10 @@ class TransferJobManagerTest(unittest.TestCase):
         )
 
         with patch(
-            "app.chain.transfer.TransferHistoryOper",
+            "app.chain.transfer.get_chain_transfer_history_port",
             return_value=transfer_history_oper,
         ), patch(
-            "app.chain.transfer.DownloadHistoryOper",
+            "app.chain.transfer.get_chain_download_history_port",
             return_value=download_history_oper,
         ), patch(
             "app.chain.transfer.get_configured_system_config",
@@ -1180,10 +1180,10 @@ class TransferJobManagerTest(unittest.TestCase):
         storage_chain = SimpleNamespace(get_item=lambda fileitem: subtitle_fileitem)
 
         with patch(
-            "app.chain.transfer.TransferHistoryOper",
+            "app.chain.transfer.get_chain_transfer_history_port",
             return_value=transfer_history_oper,
         ), patch(
-            "app.chain.transfer.DownloadHistoryOper",
+            "app.chain.transfer.get_chain_download_history_port",
             return_value=download_history_oper,
         ), patch(
             "app.chain.transfer.get_configured_system_config",
@@ -1261,10 +1261,10 @@ class TransferJobManagerTest(unittest.TestCase):
         )
 
         with patch(
-            "app.chain.transfer.TransferHistoryOper",
+            "app.chain.transfer.get_chain_transfer_history_port",
             return_value=transfer_history_oper,
         ), patch(
-            "app.chain.transfer.DownloadHistoryOper",
+            "app.chain.transfer.get_chain_download_history_port",
             return_value=download_history_oper,
         ), patch(
             "app.chain.transfer.get_configured_system_config",
@@ -1366,10 +1366,10 @@ class TransferJobManagerTest(unittest.TestCase):
         )
 
         with patch(
-            "app.chain.transfer.TransferHistoryOper",
+            "app.chain.transfer.get_chain_transfer_history_port",
             return_value=transfer_history_oper,
         ), patch(
-            "app.chain.transfer.DownloadHistoryOper",
+            "app.chain.transfer.get_chain_download_history_port",
             return_value=download_history_oper,
         ), patch(
             "app.chain.transfer.get_configured_system_config",
@@ -1464,7 +1464,7 @@ class TransferJobManagerTest(unittest.TestCase):
         ]
 
         with patch(
-            "app.chain.transfer.TransferHistoryOper", return_value=SimpleNamespace()
+            "app.chain.transfer.get_chain_transfer_history_port", return_value=SimpleNamespace()
         ), patch(
             "app.chain.transfer.add_transfer_success",
             lambda **kwargs: SimpleNamespace(id=1),
@@ -1530,7 +1530,7 @@ class TransferJobManagerTest(unittest.TestCase):
         )
 
         with patch(
-            "app.chain.transfer.TransferHistoryOper", return_value=SimpleNamespace()
+            "app.chain.transfer.get_chain_transfer_history_port", return_value=SimpleNamespace()
         ), patch(
             "app.chain.transfer.add_transfer_success",
             lambda **kwargs: SimpleNamespace(id=1),
diff --git a/tests/test_transfer_movie_collection.py b/tests/test_transfer_movie_collection.py
index f4adcaf16..523cccfa7 100644
--- a/tests/test_transfer_movie_collection.py
+++ b/tests/test_transfer_movie_collection.py
@@ -104,10 +104,10 @@ def test_conflicting_download_history_recognizes_movie_by_file_meta(monkeypatch)
         try_remove_job=lambda task: None,
     )
     monkeypatch.setattr(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         lambda: SimpleNamespace(get_by_type_tmdbid=lambda **kwargs: None),
     )
-    monkeypatch.setattr("app.chain._transfer.TransferHistoryOper", lambda: SimpleNamespace(get_by_type_tmdbid=lambda **kwargs: None))
+    monkeypatch.setattr("app.chain._transfer.get_chain_transfer_history_port", lambda: SimpleNamespace(get_by_type_tmdbid=lambda **kwargs: None))
     monkeypatch.setattr(
         "app.chain.transfer.MediaChain",
         lambda: SimpleNamespace(
@@ -187,12 +187,12 @@ def test_movie_collection_conflict_only_drops_automatic_media(
 
     chain._TransferChain__handle_transfer = fake_handle_transfer
     monkeypatch.setattr(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None),
     )
-    monkeypatch.setattr("app.chain._transfer.TransferHistoryOper", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
-    monkeypatch.setattr("app.chain.transfer.DownloadHistoryOper", lambda: history_oper)
-    monkeypatch.setattr("app.chain._transfer.DownloadHistoryOper", lambda: history_oper)
+    monkeypatch.setattr("app.chain._transfer.get_chain_transfer_history_port", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
+    monkeypatch.setattr("app.chain.transfer.get_chain_download_history_port", lambda: history_oper)
+    monkeypatch.setattr("app.chain._transfer.get_chain_download_history_port", lambda: history_oper)
     monkeypatch.setattr(
         "app.chain.transfer.get_configured_system_config",
         lambda: SimpleNamespace(get=lambda key: None),
diff --git a/tests/test_transfer_overwrite_declined.py b/tests/test_transfer_overwrite_declined.py
index f3114fd2b..553e6c5c2 100644
--- a/tests/test_transfer_overwrite_declined.py
+++ b/tests/test_transfer_overwrite_declined.py
@@ -153,7 +153,7 @@ def test_default_callback_skips_history_and_notification_when_overwrite_declined
     )
 
     with patch(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         return_value=transfer_history_oper,
     ), patch(
         "app.chain.transfer.add_transfer_fail",
@@ -199,7 +199,7 @@ def test_default_callback_keeps_original_failure_semantics_without_success_histo
     )
 
     with patch(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         return_value=transfer_history_oper,
     ), patch(
         "app.chain.transfer.add_transfer_fail",
@@ -251,7 +251,7 @@ def test_default_callback_delegates_primary_failure_to_durable_writer():
 
     chain.durable_event_writer.transfer_result.side_effect = durable_transfer_result
     with patch(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         return_value=transfer_history_oper,
     ), patch(
         "app.chain.transfer.add_transfer_fail",
diff --git a/tests/test_transfer_sync_extra_files.py b/tests/test_transfer_sync_extra_files.py
index 5c48f58da..612733c57 100644
--- a/tests/test_transfer_sync_extra_files.py
+++ b/tests/test_transfer_sync_extra_files.py
@@ -139,12 +139,12 @@ def test_sync_extra_subtitle_inherits_matching_video_episode(monkeypatch):
 
     monkeypatch.setattr(chain, "_TransferChain__handle_transfer", fake_handle_transfer)
     monkeypatch.setattr(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None),
     )
-    monkeypatch.setattr("app.chain._transfer.TransferHistoryOper", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
+    monkeypatch.setattr("app.chain._transfer.get_chain_transfer_history_port", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
     monkeypatch.setattr(
-        "app.chain.transfer.DownloadHistoryOper",
+        "app.chain.transfer.get_chain_download_history_port",
         lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
@@ -152,7 +152,7 @@ def test_sync_extra_subtitle_inherits_matching_video_episode(monkeypatch):
             get_by_path=lambda path: None,
         ),
     )
-    monkeypatch.setattr("app.chain._transfer.DownloadHistoryOper", lambda: SimpleNamespace(
+    monkeypatch.setattr("app.chain._transfer.get_chain_download_history_port", lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
             get_files_by_savepath=lambda savepath: [],
@@ -236,12 +236,12 @@ def test_single_subtitle_transfer_reuses_same_name_video_episode(monkeypatch):
 
     monkeypatch.setattr(chain, "_TransferChain__handle_transfer", fake_handle_transfer)
     monkeypatch.setattr(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None),
     )
-    monkeypatch.setattr("app.chain._transfer.TransferHistoryOper", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
+    monkeypatch.setattr("app.chain._transfer.get_chain_transfer_history_port", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
     monkeypatch.setattr(
-        "app.chain.transfer.DownloadHistoryOper",
+        "app.chain.transfer.get_chain_download_history_port",
         lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
@@ -249,7 +249,7 @@ def test_single_subtitle_transfer_reuses_same_name_video_episode(monkeypatch):
             get_by_path=lambda path: None,
         ),
     )
-    monkeypatch.setattr("app.chain._transfer.DownloadHistoryOper", lambda: SimpleNamespace(
+    monkeypatch.setattr("app.chain._transfer.get_chain_download_history_port", lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
             get_files_by_savepath=lambda savepath: [],
@@ -351,12 +351,12 @@ def test_single_video_transfer_lists_parent_once_for_same_name_extra(monkeypatch
 
     monkeypatch.setattr(chain, "_TransferChain__handle_transfer", fake_handle_transfer)
     monkeypatch.setattr(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None),
     )
-    monkeypatch.setattr("app.chain._transfer.TransferHistoryOper", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
+    monkeypatch.setattr("app.chain._transfer.get_chain_transfer_history_port", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
     monkeypatch.setattr(
-        "app.chain.transfer.DownloadHistoryOper",
+        "app.chain.transfer.get_chain_download_history_port",
         lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
@@ -364,7 +364,7 @@ def test_single_video_transfer_lists_parent_once_for_same_name_extra(monkeypatch
             get_by_path=lambda path: None,
         ),
     )
-    monkeypatch.setattr("app.chain._transfer.DownloadHistoryOper", lambda: SimpleNamespace(
+    monkeypatch.setattr("app.chain._transfer.get_chain_download_history_port", lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
             get_files_by_savepath=lambda savepath: [],
@@ -449,12 +449,12 @@ def test_episode_format_filters_extra_files_before_sync_planning(monkeypatch):
 
     monkeypatch.setattr(chain, "_TransferChain__handle_transfer", fake_handle_transfer)
     monkeypatch.setattr(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None),
     )
-    monkeypatch.setattr("app.chain._transfer.TransferHistoryOper", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
+    monkeypatch.setattr("app.chain._transfer.get_chain_transfer_history_port", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
     monkeypatch.setattr(
-        "app.chain.transfer.DownloadHistoryOper",
+        "app.chain.transfer.get_chain_download_history_port",
         lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
@@ -462,7 +462,7 @@ def test_episode_format_filters_extra_files_before_sync_planning(monkeypatch):
             get_by_path=lambda path: None,
         ),
     )
-    monkeypatch.setattr("app.chain._transfer.DownloadHistoryOper", lambda: SimpleNamespace(
+    monkeypatch.setattr("app.chain._transfer.get_chain_download_history_port", lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
             get_files_by_savepath=lambda savepath: [],
@@ -536,12 +536,12 @@ def test_episode_format_keeps_matching_extra_files_following_main(monkeypatch):
 
     monkeypatch.setattr(chain, "_TransferChain__handle_transfer", fake_handle_transfer)
     monkeypatch.setattr(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None),
     )
-    monkeypatch.setattr("app.chain._transfer.TransferHistoryOper", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
+    monkeypatch.setattr("app.chain._transfer.get_chain_transfer_history_port", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
     monkeypatch.setattr(
-        "app.chain.transfer.DownloadHistoryOper",
+        "app.chain.transfer.get_chain_download_history_port",
         lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
@@ -549,7 +549,7 @@ def test_episode_format_keeps_matching_extra_files_following_main(monkeypatch):
             get_by_path=lambda path: None,
         ),
     )
-    monkeypatch.setattr("app.chain._transfer.DownloadHistoryOper", lambda: SimpleNamespace(
+    monkeypatch.setattr("app.chain._transfer.get_chain_download_history_port", lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
             get_files_by_savepath=lambda savepath: [],
@@ -632,12 +632,12 @@ def test_single_matching_subtitle_uses_unmatched_video_only_as_context(monkeypat
 
     monkeypatch.setattr(chain, "_TransferChain__handle_transfer", fake_handle_transfer)
     monkeypatch.setattr(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None),
     )
-    monkeypatch.setattr("app.chain._transfer.TransferHistoryOper", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
+    monkeypatch.setattr("app.chain._transfer.get_chain_transfer_history_port", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
     monkeypatch.setattr(
-        "app.chain.transfer.DownloadHistoryOper",
+        "app.chain.transfer.get_chain_download_history_port",
         lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
@@ -645,7 +645,7 @@ def test_single_matching_subtitle_uses_unmatched_video_only_as_context(monkeypat
             get_by_path=lambda path: None,
         ),
     )
-    monkeypatch.setattr("app.chain._transfer.DownloadHistoryOper", lambda: SimpleNamespace(
+    monkeypatch.setattr("app.chain._transfer.get_chain_download_history_port", lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
             get_files_by_savepath=lambda savepath: [],
@@ -728,12 +728,12 @@ def test_cleanup_dest_fileitem_is_deleted_only_after_allowed_items_exist(monkeyp
 
     monkeypatch.setattr(chain, "_TransferChain__handle_transfer", fake_handle_transfer)
     monkeypatch.setattr(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None),
     )
-    monkeypatch.setattr("app.chain._transfer.TransferHistoryOper", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
+    monkeypatch.setattr("app.chain._transfer.get_chain_transfer_history_port", lambda: SimpleNamespace(get_by_src=lambda src, storage=None: None))
     monkeypatch.setattr(
-        "app.chain.transfer.DownloadHistoryOper",
+        "app.chain.transfer.get_chain_download_history_port",
         lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
@@ -741,7 +741,7 @@ def test_cleanup_dest_fileitem_is_deleted_only_after_allowed_items_exist(monkeyp
             get_by_path=lambda path: None,
         ),
     )
-    monkeypatch.setattr("app.chain._transfer.DownloadHistoryOper", lambda: SimpleNamespace(
+    monkeypatch.setattr("app.chain._transfer.get_chain_download_history_port", lambda: SimpleNamespace(
             get_by_hash=lambda download_hash: None,
             get_file_by_fullpath=lambda fullpath: None,
             get_files_by_savepath=lambda savepath: [],
diff --git a/tests/test_transfer_tmdb_category.py b/tests/test_transfer_tmdb_category.py
index 6a7818951..1d74228f0 100644
--- a/tests/test_transfer_tmdb_category.py
+++ b/tests/test_transfer_tmdb_category.py
@@ -76,10 +76,10 @@ def test_transfer_stops_when_automatic_category_has_no_tmdb_result(monkeypatch)
     chain = object.__new__(TransferChain)
     chain.jobview = SimpleNamespace(try_remove_job=lambda _task: None)
     monkeypatch.setattr(
-        "app.chain.transfer.TransferHistoryOper",
+        "app.chain.transfer.get_chain_transfer_history_port",
         lambda: SimpleNamespace(),
     )
-    monkeypatch.setattr("app.chain._transfer.TransferHistoryOper", lambda: SimpleNamespace())
+    monkeypatch.setattr("app.chain._transfer.get_chain_transfer_history_port", lambda: SimpleNamespace())
     monkeypatch.setattr(
         "app.chain.transfer.MediaChain",
         lambda: SimpleNamespace(