diff --git a/backend/app/api/access_keys.py b/backend/app/api/access_keys.py
new file mode 100644
index 00000000..eea2b9a0
--- /dev/null
+++ b/backend/app/api/access_keys.py
@@ -0,0 +1,9 @@
+"""访问密钥与服务账号（docs/design/next-round/04-对外集成与触达.md A1–A7）。
+
+main.py 挂登录即可（require_role("user")）：本人的个人密钥本人管，服务账号和全部密钥在接口里要管理员。第 2 波 W2-d 填。
+"""
+from __future__ import annotations
+
+from fastapi import APIRouter
+
+router = APIRouter(prefix="/api/access-keys", tags=["access-keys"])
diff --git a/backend/app/api/evals.py b/backend/app/api/evals.py
new file mode 100644
index 00000000..21238230
--- /dev/null
+++ b/backend/app/api/evals.py
@@ -0,0 +1,9 @@
+"""评测接口（docs/design/next-round/01-效果度量与回归评测.md）：题集、题目、期望答案试算、评测、结果、对比。
+
+整组只给搭建者及以上（main.py 挂 require_role("builder")）。第 2 波 W2-c 起填。
+"""
+from __future__ import annotations
+
+from fastapi import APIRouter
+
+router = APIRouter(prefix="/api/evals", tags=["evals"])
diff --git a/backend/app/api/ledger.py b/backend/app/api/ledger.py
index 7bd78ea4..10bc2165 100644
--- a/backend/app/api/ledger.py
+++ b/backend/app/api/ledger.py
@@ -16,6 +16,9 @@ from app.db.models import Workflow
 from app.db.models_process import ActionRecord
 
 router = APIRouter(prefix="/api/ledger", tags=["ledger"])
+#: 口径账本里按运行读的那几个（一个答案里每个数的口径标签等，docs/design/next-round/02-口径账本.md）：挂在
+#: /api/runs/{run_id}/ledger… 下，和证据接口同一道门（main.py 挂 evidence_scope：使用者只读、而且要能读这次运行）
+runs_router = APIRouter(prefix="/api/runs", tags=["ledger"])
 
 
 @router.get("/workflow-versions/{workflow_id}/{version}")
diff --git a/backend/app/db/base.py b/backend/app/db/base.py
index 40204684..b45bbade 100644
--- a/backend/app/db/base.py
+++ b/backend/app/db/base.py
@@ -245,6 +245,9 @@ _COLUMN_MIGRATIONS: list[tuple[str, str, str]] = [
     ("schedules", "target_kind", "VARCHAR(20) DEFAULT 'workflow'"),
     ("schedules", "target_id", "VARCHAR(32)"),
     ("schedule_fires", "eval_run_id", "VARCHAR(32)"),
+    # 第 2 波：服务账号（users.kind）；剖析上传表格源时的快照
+    ("users", "kind", "VARCHAR(20) DEFAULT 'person'"),
+    ("catalog_profile_tasks", "snapshot_id", "VARCHAR(32)"),
 ]
 
 #: 迁移补上的列要建的索引：(索引名, 表, 列或多列)。create_all 不碰已有的表，表上新列的索引也就不会建。
@@ -259,6 +262,8 @@ _INDEX_MIGRATIONS: list[tuple[str, str, str | tuple[str, ...]]] = [
     ("ix_runs_wf_ver_status", "runs", ("workflow_id", "version", "status")),
     ("ix_conversations_app_id", "conversations", "app_id"),
     ("ix_conversations_created_by", "conversations", "created_by"),
+    # 口径账本按种类反查工件（kind=caliber_match，next-round 02 做法 2）
+    ("ix_artifacts_kind", "artifacts", "kind"),
 ]
 
 
diff --git a/backend/app/db/models.py b/backend/app/db/models.py
index 6c11c6bf..8232536d 100644
--- a/backend/app/db/models.py
+++ b/backend/app/db/models.py
@@ -521,6 +521,8 @@ class CatalogProfileTask(Base):
     version: Mapped[int] = mapped_column(Integer, default=0)
     # 整张表的原因：表结构里没有、视图、空表、没有可剖析的项、写入一直冲突、停止 / 中断 / 止损
     error: Mapped[str | None] = mapped_column(Text, default=None)
+    # 剖析上传表格源时那一刻的快照（数据库源为空）：上传表格换了版本之后，旧版本的剖析事实不再交给 look（next-round 遗留 e）
+    snapshot_id: Mapped[str | None] = mapped_column(String(32), default=None)
     started_at: Mapped[datetime | None] = mapped_column(UTCDateTime, default=None)
     finished_at: Mapped[datetime | None] = mapped_column(UTCDateTime, default=None)
 
@@ -1081,3 +1083,6 @@ from app.db.models_process import (  # noqa: E402,F401
 from app.db.models_blueprints import (  # noqa: E402,F401
     Blueprint, BlueprintEvent, PublishPlan, RecordsTable, StoredFile,
 )
+# 下一轮第 2 波（docs/design/next-round）：数据源对象索引与后台探查（models_sources）、评测（models_eval）。整模块导入，
+# 各自的模型类由那两个文件自己登记，这里不逐个列名
+from app.db import models_eval, models_sources  # noqa: E402,F401
diff --git a/backend/app/db/models_eval.py b/backend/app/db/models_eval.py
new file mode 100644
index 00000000..e06dd7a9
--- /dev/null
+++ b/backend/app/db/models_eval.py
@@ -0,0 +1,5 @@
+"""评测：题集、题目、评测、结果（docs/design/next-round/01-效果度量与回归评测.md 做法 7）。
+
+第 2 波 W2-c 填。由 app/db/models.py 末尾整模块导入，create_all 建表。
+"""
+from __future__ import annotations
diff --git a/backend/app/db/models_identity.py b/backend/app/db/models_identity.py
index 67a7638c..1495e138 100644
--- a/backend/app/db/models_identity.py
+++ b/backend/app/db/models_identity.py
@@ -28,6 +28,8 @@ class User(Base, TimestampMixin):
     display_name: Mapped[str] = mapped_column(String(100), default="")
     email: Mapped[str | None] = mapped_column(String(200), default=None)
     role: Mapped[str] = mapped_column(String(20), default="user")
+    # person 人；service 服务账号（next-round 04 A1）：管理员建，没有口令、不能登录，只持有访问密钥
+    kind: Mapped[str] = mapped_column(String(20), default="person")
     # local 模式：hashlib.scrypt 的结果（含盐和参数）；OIDC 用户为空
     password_hash: Mapped[str | None] = mapped_column(Text, default=None)
     oidc_issuer: Mapped[str | None] = mapped_column(String(300), default=None)
diff --git a/backend/app/db/models_sources.py b/backend/app/db/models_sources.py
new file mode 100644
index 00000000..949d5ed1
--- /dev/null
+++ b/backend/app/db/models_sources.py
@@ -0,0 +1,5 @@
+"""数据源的对象索引、探查范围、后台探查任务（docs/design/next-round/03-数据接入与目录维护.md A1）。
+
+第 2 波 W2-a 填。由 app/db/models.py 末尾整模块导入，create_all 建表。
+"""
+from __future__ import annotations
diff --git a/backend/app/main.py b/backend/app/main.py
index 045cb390..88f6946d 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -18,6 +18,8 @@ from app.api import (
     actions as actions_api, apps as apps_api, auth as auth_api, capabilities as capabilities_api, hooks as hooks_api,
     identity as identity_api, ledger as ledger_api, notify as notify_api, tasks as tasks_api,
 )
+# 下一轮第 2 波（docs/design/next-round）：评测、访问密钥
+from app.api import access_keys as access_keys_api, evals as evals_api
 # 普通用户建应用（docs/design/normal-user-apps.md §3.10）：蓝图、模板、文件、个人应用。权限在接口里按蓝图的范围和拥有者判
 from app.api import (
     blueprints as blueprints_api, copilot_blueprint, files as files_api, personal as personal_api,
@@ -214,6 +216,8 @@ for router, guard in (
     (bundle.router, [*_BUILDER, private_run_scope]),
     (inquiry.router, [*_BUILDER, private_run_scope]),
     (whatif.router, [*_BUILDER, private_run_scope]),
+    # 口径账本按运行读的接口（/api/runs/{run_id}/ledger…）：和证据同一道门
+    (ledger_api.runs_router, [evidence_scope]),
     (runs.router, [run_scope]),
     (runs.approvals_router, _BUILDER),
     (evidence.router, [evidence_scope]),
@@ -262,6 +266,9 @@ for router, guard in (
     (hooks_api.router, []),
     (notify_api.router, _USER),
     (ledger_api.router, _BUILDER),
+    # 下一轮第 2 波：评测只给搭建者；访问密钥登录即可，接口里再按本人 / 管理员判
+    (evals_api.router, _BUILDER),
+    (access_keys_api.router, _USER),
 ):
     app.include_router(router, dependencies=guard)