feat(expenses): add transactional expense case events

server/src/app/api/deps.py

@@ -26,6 +26,7 @@ class CurrentUserContext:
     name: str
     role_codes: list[str]
     is_admin: bool
+    tenant_id: str = "default"
     department_name: str = ""
     cost_center: str = ""
     position: str = ""
@@ -101,6 +102,7 @@ def get_current_user(
         name=name or username,
         role_codes=role_codes,
         is_admin=is_admin,
+        tenant_id="default",
         department_name=(x_auth_department or "").strip(),
         cost_center=(x_auth_cost_center or "").strip(),
         position=(x_auth_position or "").strip(),

server/src/app/api/v1/endpoints/expense_cases.py

@@ -0,0 +1,42 @@
+from __future__ import annotations
+
+from typing import Annotated
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.api.deps import CurrentUserContext, get_current_user, get_db
+from app.schemas.expense_case import ExpenseCaseTimelineRead
+from app.services.expense_cases import ExpenseCaseService
+from app.services.expense_claims import ExpenseClaimService
+
+router = APIRouter(prefix="/expense-cases")
+DbSession = Annotated[Session, Depends(get_db)]
+CurrentUser = Annotated[CurrentUserContext, Depends(get_current_user)]
+
+
+@router.get(
+    "/by-claim/{claim_id}",
+    response_model=ExpenseCaseTimelineRead,
+    summary="查询报销单所属费用事件时间线",
+    description="返回当前用户有权查看的费用事件、关联单据和结构化业务事件。",
+)
+def get_expense_case_by_claim(
+    claim_id: str,
+    db: DbSession,
+    current_user: CurrentUser,
+) -> ExpenseCaseTimelineRead:
+    claim = ExpenseClaimService(db).get_claim(claim_id, current_user)
+    if claim is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="费用单据不存在。")
+
+    expense_case = ExpenseCaseService(db).get_timeline_for_claim(
+        claim.id,
+        tenant_id=current_user.tenant_id,
+    )
+    if expense_case is None:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="该单据尚未纳入统一费用事件。",
+        )
+    return ExpenseCaseTimelineRead.model_validate(expense_case)

server/src/app/api/v1/router.py

@@ -12,6 +12,7 @@ from app.api.v1.endpoints.auth import router as auth_router
 from app.api.v1.endpoints.bootstrap import router as bootstrap_router
 from app.api.v1.endpoints.budgets import router as budgets_router
 from app.api.v1.endpoints.employees import router as employees_router
+from app.api.v1.endpoints.expense_cases import router as expense_cases_router
 from app.api.v1.endpoints.employee_profiles import router as employee_profiles_router
 from app.api.v1.endpoints.health import router as health_router
 from app.api.v1.endpoints.knowledge import router as knowledge_router
@@ -48,6 +49,7 @@ router.include_router(ontology_router, tags=["ontology"])
 router.include_router(orchestrator_router, tags=["orchestrator"])
 router.include_router(receipt_folder_router, tags=["receipt-folder"])
 router.include_router(employees_router, prefix="/employees", tags=["employees"])
+router.include_router(expense_cases_router, tags=["expense-cases"])
 router.include_router(employee_profiles_router, tags=["employee-profiles"])
 router.include_router(reimbursements_router, prefix="/reimbursements", tags=["reimbursements"])
 router.include_router(risk_observations_router, tags=["risk-observations"])

server/src/app/db/base.py

@@ -15,6 +15,7 @@ from app.models.budget import BudgetAllocation, BudgetReservation, BudgetTransac
 from app.models.employee_change_log import EmployeeChangeLog
 from app.models.employee_behavior_profile import EmployeeBehaviorProfileSnapshot
 from app.models.employee import Employee
+from app.models.expense_case import BusinessEvent, ExpenseCase, ExpenseCaseLink
 from app.models.few_shot_sample import FewShotSample
 from app.models.financial_record import (
     AccountsPayableRecord,
@@ -56,6 +57,9 @@ __all__ = [
     "BudgetReservation",
     "BudgetTransaction",
     "Employee",
+    "ExpenseCase",
+    "ExpenseCaseLink",
+    "BusinessEvent",
     "EmployeeBehaviorProfileSnapshot",
     "EmployeeChangeLog",
     "ExpenseClaim",

server/src/app/models/__init__.py

@@ -8,6 +8,7 @@ from app.models.budget import BudgetAllocation, BudgetReservation, BudgetTransac
 from app.models.employee_change_log import EmployeeChangeLog
 from app.models.employee_behavior_profile import EmployeeBehaviorProfileSnapshot
 from app.models.employee import Employee
+from app.models.expense_case import BusinessEvent, ExpenseCase, ExpenseCaseLink
 from app.models.few_shot_sample import FewShotSample
 from app.models.financial_record import (
     AccountsPayableRecord,
@@ -47,6 +48,9 @@ __all__ = [
     "BudgetReservation",
     "BudgetTransaction",
     "Employee",
+    "ExpenseCase",
+    "ExpenseCaseLink",
+    "BusinessEvent",
     "EmployeeBehaviorProfileSnapshot",
     "EmployeeChangeLog",
     "ExpenseClaim",

server/src/app/models/expense_case.py

@@ -0,0 +1,112 @@
+from __future__ import annotations
+
+import uuid
+from datetime import datetime
+from typing import Any
+
+from sqlalchemy import DateTime, ForeignKey, Index, Integer, String, Text, UniqueConstraint, func
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from sqlalchemy.types import JSON
+
+from app.db.base_class import Base
+
+
+def _new_id() -> str:
+    return str(uuid.uuid4())
+
+
+class ExpenseCase(Base):
+    __tablename__ = "expense_cases"
+    __table_args__ = (
+        UniqueConstraint("tenant_id", "case_no", name="uq_expense_cases_tenant_case_no"),
+        Index("ix_expense_cases_tenant_stage", "tenant_id", "current_stage"),
+        Index("ix_expense_cases_tenant_status", "tenant_id", "status"),
+    )
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=_new_id)
+    tenant_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
+    case_no: Mapped[str] = mapped_column(String(80), nullable=False)
+    scene_code: Mapped[str] = mapped_column(String(50), nullable=False, default="other")
+    title: Mapped[str] = mapped_column(String(200), nullable=False)
+    owner_employee_id: Mapped[str | None] = mapped_column(String(36), nullable=True, index=True)
+    current_stage: Mapped[str] = mapped_column(String(40), nullable=False, default="claiming")
+    status: Mapped[str] = mapped_column(String(30), nullable=False, default="active")
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )
+
+    links = relationship(
+        "ExpenseCaseLink",
+        back_populates="expense_case",
+        cascade="all, delete-orphan",
+        order_by="asc(ExpenseCaseLink.created_at)",
+    )
+    events = relationship(
+        "BusinessEvent",
+        back_populates="expense_case",
+        cascade="all, delete-orphan",
+        order_by="asc(BusinessEvent.occurred_at)",
+    )
+
+
+class ExpenseCaseLink(Base):
+    __tablename__ = "expense_case_links"
+    __table_args__ = (
+        UniqueConstraint("resource_type", "resource_id", name="uq_expense_case_links_resource"),
+        Index("ix_expense_case_links_tenant_case", "tenant_id", "expense_case_id"),
+    )
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=_new_id)
+    tenant_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
+    expense_case_id: Mapped[str] = mapped_column(
+        ForeignKey("expense_cases.id", ondelete="CASCADE"), nullable=False
+    )
+    resource_type: Mapped[str] = mapped_column(String(50), nullable=False)
+    resource_id: Mapped[str] = mapped_column(String(100), nullable=False)
+    relation_type: Mapped[str] = mapped_column(String(50), nullable=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+
+    expense_case = relationship("ExpenseCase", back_populates="links")
+
+
+class BusinessEvent(Base):
+    __tablename__ = "business_events"
+    __table_args__ = (
+        UniqueConstraint(
+            "tenant_id",
+            "aggregate_type",
+            "aggregate_id",
+            "event_type",
+            "idempotency_key",
+            name="uq_business_event_idempotency",
+        ),
+        Index("ix_business_events_tenant_case_time", "tenant_id", "expense_case_id", "occurred_at"),
+        Index("ix_business_events_outbox", "delivery_status", "occurred_at"),
+        Index("ix_business_events_aggregate", "aggregate_type", "aggregate_id"),
+    )
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=_new_id)
+    tenant_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
+    expense_case_id: Mapped[str] = mapped_column(
+        ForeignKey("expense_cases.id", ondelete="CASCADE"), nullable=False
+    )
+    aggregate_type: Mapped[str] = mapped_column(String(50), nullable=False)
+    aggregate_id: Mapped[str] = mapped_column(String(100), nullable=False)
+    event_type: Mapped[str] = mapped_column(String(80), nullable=False, index=True)
+    event_version: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
+    idempotency_key: Mapped[str] = mapped_column(String(120), nullable=False)
+    correlation_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
+    causation_id: Mapped[str | None] = mapped_column(String(64), nullable=True)
+    actor_id: Mapped[str] = mapped_column(String(120), nullable=False)
+    actor_type: Mapped[str] = mapped_column(String(30), nullable=False, default="user")
+    payload_json: Mapped[dict[str, Any]] = mapped_column(JSON, nullable=False, default=dict)
+    delivery_status: Mapped[str] = mapped_column(String(20), nullable=False, default="pending")
+    delivery_attempts: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    last_delivery_error: Mapped[str | None] = mapped_column(Text(), nullable=True)
+    occurred_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now()
+    )
+    published_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+
+    expense_case = relationship("ExpenseCase", back_populates="events")

server/src/app/repositories/audit_log.py

@@ -50,8 +50,11 @@ class AuditLogRepository:
             stmt = stmt.limit(limit)
         return list(self.db.scalars(stmt).all())
 
-    def create(self, log: AuditLog) -> AuditLog:
+    def create(self, log: AuditLog, *, commit: bool = True) -> AuditLog:
         self.db.add(log)
-        self.db.commit()
+        if commit:
+            self.db.commit()
+        else:
+            self.db.flush()
         self.db.refresh(log)
         return log

server/src/app/schemas/expense_case.py

@@ -0,0 +1,51 @@
+from __future__ import annotations
+
+from datetime import datetime
+from typing import Any
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class ExpenseCaseLinkRead(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: str
+    resource_type: str
+    resource_id: str
+    relation_type: str
+    created_at: datetime
+
+
+class BusinessEventRead(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: str
+    event_type: str
+    event_version: int
+    idempotency_key: str
+    aggregate_type: str
+    aggregate_id: str
+    correlation_id: str
+    causation_id: str | None
+    actor_id: str
+    actor_type: str
+    payload_json: dict[str, Any] = Field(default_factory=dict)
+    delivery_status: str
+    occurred_at: datetime
+    published_at: datetime | None
+
+
+class ExpenseCaseTimelineRead(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: str
+    case_no: str
+    scene_code: str
+    title: str
+    owner_employee_id: str | None
+    current_stage: str
+    status: str
+    created_at: datetime
+    updated_at: datetime
+    links: list[ExpenseCaseLinkRead] = Field(default_factory=list)
+    events: list[BusinessEventRead] = Field(default_factory=list)

server/src/app/services/agent_foundation.py

@@ -38,6 +38,11 @@ from app.services.agent_foundation_spreadsheets import AgentFoundationSpreadshee
 logger = get_logger("app.services.agent_foundation")
 _foundation_ready_lock = threading.RLock()
 _foundation_ready_keys: set[str] = set()
+MIGRATION_OWNED_TABLES = {
+    "expense_cases",
+    "expense_case_links",
+    "business_events",
+}
 
 
 def prepare_agent_foundation() -> None:
@@ -77,7 +82,12 @@ class AgentFoundationService(
 
     def _prepare_foundation(self) -> None:
         try:
-            Base.metadata.create_all(bind=self.db.get_bind())
+            legacy_bootstrap_tables = [
+                table
+                for table in Base.metadata.sorted_tables
+                if table.name not in MIGRATION_OWNED_TABLES
+            ]
+            Base.metadata.create_all(bind=self.db.get_bind(), tables=legacy_bootstrap_tables)
             self._ensure_agent_asset_schema()
             self._ensure_financial_record_schema()
             self._seed_agent_assets()

server/src/app/services/audit.py

@@ -1,53 +1,54 @@
-from __future__ import annotations
-
+from __future__ import annotations
+
 import uuid
 from datetime import UTC, datetime
 from typing import Any
-
-from sqlalchemy.orm import Session
-
-from app.core.logging import get_logger
-from app.models.audit_log import AuditLog
-from app.repositories.audit_log import AuditLogRepository
-from app.schemas.audit_log import AuditLogRead
-from app.services.agent_foundation import AgentFoundationService
-
-logger = get_logger("app.services.audit")
-
-
-class AuditLogService:
-    def __init__(self, db: Session) -> None:
-        self.db = db
-        self.repository = AuditLogRepository(db)
-
-    def list_logs(
-        self,
-        *,
-        resource_type: str | None = None,
-        resource_id: str | None = None,
-        action: str | None = None,
-        limit: int = 50,
-    ) -> list[AuditLogRead]:
-        self._ensure_ready()
-        items = self.repository.list(
-            resource_type=resource_type,
-            resource_id=resource_id,
-            action=action,
-            limit=limit,
-        )
-        return [AuditLogRead.model_validate(item) for item in items]
-
-    def log_action(
-        self,
-        *,
-        actor: str,
-        action: str,
-        resource_type: str,
-        resource_id: str,
-        before_json: dict[str, Any] | None = None,
-        after_json: dict[str, Any] | None = None,
-        request_id: str | None = None,
-    ) -> AuditLog:
+
+from sqlalchemy.orm import Session
+
+from app.core.logging import get_logger
+from app.models.audit_log import AuditLog
+from app.repositories.audit_log import AuditLogRepository
+from app.schemas.audit_log import AuditLogRead
+from app.services.agent_foundation import AgentFoundationService
+
+logger = get_logger("app.services.audit")
+
+
+class AuditLogService:
+    def __init__(self, db: Session) -> None:
+        self.db = db
+        self.repository = AuditLogRepository(db)
+
+    def list_logs(
+        self,
+        *,
+        resource_type: str | None = None,
+        resource_id: str | None = None,
+        action: str | None = None,
+        limit: int = 50,
+    ) -> list[AuditLogRead]:
+        self._ensure_ready()
+        items = self.repository.list(
+            resource_type=resource_type,
+            resource_id=resource_id,
+            action=action,
+            limit=limit,
+        )
+        return [AuditLogRead.model_validate(item) for item in items]
+
+    def log_action(
+        self,
+        *,
+        actor: str,
+        action: str,
+        resource_type: str,
+        resource_id: str,
+        before_json: dict[str, Any] | None = None,
+        after_json: dict[str, Any] | None = None,
+        request_id: str | None = None,
+        commit: bool = True,
+    ) -> AuditLog:
         log = AuditLog(
             actor=actor,
             action=action,
@@ -58,15 +59,15 @@ class AuditLogService:
             request_id=request_id or uuid.uuid4().hex,
             created_at=datetime.now(UTC),
         )
-        created = self.repository.create(log)
-        logger.info(
-            "Created audit log id=%s action=%s resource=%s:%s",
-            created.id,
-            created.action,
-            created.resource_type,
-            created.resource_id,
-        )
-        return created
-
-    def _ensure_ready(self) -> None:
-        AgentFoundationService(self.db).ensure_foundation_ready()
+        created = self.repository.create(log, commit=commit)
+        logger.info(
+            "Created audit log id=%s action=%s resource=%s:%s",
+            created.id,
+            created.action,
+            created.resource_type,
+            created.resource_id,
+        )
+        return created
+
+    def _ensure_ready(self) -> None:
+        AgentFoundationService(self.db).ensure_foundation_ready()

server/src/app/services/expense_cases.py

@@ -0,0 +1,306 @@
+from __future__ import annotations
+
+import hashlib
+import uuid
+from datetime import UTC, datetime
+from decimal import Decimal
+from typing import Any
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session, selectinload
+
+from app.models.expense_case import BusinessEvent, ExpenseCase, ExpenseCaseLink
+from app.models.financial_record import ExpenseClaim
+from app.services.document_numbering import is_application_claim_no
+
+DEFAULT_TENANT_ID = "default"
+
+
+class ExpenseCaseService:
+    """费用事件编排的最小持久化边界。
+
+    该服务只允许 add/flush，不负责 commit。调用方必须让业务状态与事件在同一事务中提交。
+    """
+
+    def __init__(self, db: Session) -> None:
+        self.db = db
+
+    @staticmethod
+    def normalize_tenant_id(value: str | None) -> str:
+        return str(value or DEFAULT_TENANT_ID).strip() or DEFAULT_TENANT_ID
+
+    @staticmethod
+    def normalize_correlation_id(value: str | None) -> str:
+        text = str(value or "").strip()
+        if not text:
+            return uuid.uuid4().hex
+        if len(text) <= 64:
+            return text
+        digest = hashlib.sha256(text.encode("utf-8")).hexdigest()
+        return f"sha256:{digest[:57]}"
+
+    def ensure_case_for_claim(
+        self,
+        claim: ExpenseClaim,
+        *,
+        tenant_id: str | None = None,
+        relation_type: str | None = None,
+    ) -> ExpenseCase:
+        if not claim.id:
+            self.db.flush()
+        if not claim.id:
+            raise ValueError("费用单据尚未生成 ID，无法关联费用事件。")
+
+        normalized_tenant = self.normalize_tenant_id(tenant_id)
+        existing_link = self.db.scalar(
+            select(ExpenseCaseLink).where(
+                ExpenseCaseLink.resource_type == "expense_claim",
+                ExpenseCaseLink.resource_id == claim.id,
+            )
+        )
+        if existing_link is not None:
+            if existing_link.tenant_id != normalized_tenant:
+                raise PermissionError("费用单据已属于其他租户。")
+            expense_case = self.db.get(ExpenseCase, existing_link.expense_case_id)
+            if expense_case is None or expense_case.tenant_id != normalized_tenant:
+                raise RuntimeError("费用事件关联已损坏。")
+            return expense_case
+
+        case_no = f"CASE-{str(claim.claim_no or claim.id).strip()}"
+        expense_case = self.db.scalar(
+            select(ExpenseCase).where(
+                ExpenseCase.tenant_id == normalized_tenant,
+                ExpenseCase.case_no == case_no,
+            )
+        )
+        if expense_case is None:
+            expense_case = ExpenseCase(
+                id=str(uuid.uuid4()),
+                tenant_id=normalized_tenant,
+                case_no=case_no,
+                scene_code=self._scene_code(claim),
+                title=self._case_title(claim),
+                owner_employee_id=claim.employee_id,
+                current_stage=self._stage_for_claim(claim),
+                status=self._case_status_for_claim(claim),
+            )
+            self.db.add(expense_case)
+            self.db.flush()
+
+        self.link_claim(
+            expense_case,
+            claim,
+            tenant_id=normalized_tenant,
+            relation_type=relation_type or self._relation_type(claim),
+        )
+        return expense_case
+
+    def link_claim(
+        self,
+        expense_case: ExpenseCase,
+        claim: ExpenseClaim,
+        *,
+        tenant_id: str | None = None,
+        relation_type: str,
+    ) -> ExpenseCaseLink:
+        if not claim.id:
+            self.db.flush()
+        normalized_tenant = self.normalize_tenant_id(tenant_id or expense_case.tenant_id)
+        if expense_case.tenant_id != normalized_tenant:
+            raise PermissionError("不能把费用单据关联到其他租户的费用事件。")
+
+        existing_link = self.db.scalar(
+            select(ExpenseCaseLink).where(
+                ExpenseCaseLink.resource_type == "expense_claim",
+                ExpenseCaseLink.resource_id == claim.id,
+            )
+        )
+        if existing_link is not None:
+            if (
+                existing_link.tenant_id != normalized_tenant
+                or existing_link.expense_case_id != expense_case.id
+            ):
+                raise PermissionError("费用单据已经关联到其他费用事件。")
+            return existing_link
+
+        link = ExpenseCaseLink(
+            id=str(uuid.uuid4()),
+            tenant_id=normalized_tenant,
+            expense_case_id=expense_case.id,
+            resource_type="expense_claim",
+            resource_id=claim.id,
+            relation_type=relation_type,
+        )
+        self.db.add(link)
+        self.db.flush()
+        return link
+
+    def record_claim_event(
+        self,
+        claim: ExpenseClaim,
+        *,
+        event_type: str,
+        actor_id: str,
+        tenant_id: str | None = None,
+        correlation_id: str | None = None,
+        idempotency_key: str | None = None,
+        causation_id: str | None = None,
+        previous_status: str | None = None,
+        previous_approval_stage: str | None = None,
+        extra_payload: dict[str, Any] | None = None,
+        expense_case: ExpenseCase | None = None,
+        relation_type: str | None = None,
+        update_case_state: bool = True,
+    ) -> tuple[ExpenseCase, BusinessEvent]:
+        normalized_tenant = self.normalize_tenant_id(tenant_id)
+        if expense_case is None:
+            expense_case = self.ensure_case_for_claim(
+                claim,
+                tenant_id=normalized_tenant,
+                relation_type=relation_type,
+            )
+        else:
+            self.link_claim(
+                expense_case,
+                claim,
+                tenant_id=normalized_tenant,
+                relation_type=relation_type or self._relation_type(claim),
+            )
+
+        if update_case_state:
+            expense_case.current_stage = self._stage_for_claim(claim)
+            expense_case.status = self._case_status_for_claim(claim)
+        if claim.employee_id and not expense_case.owner_employee_id:
+            expense_case.owner_employee_id = claim.employee_id
+
+        payload: dict[str, Any] = {
+            "claim_no": str(claim.claim_no or ""),
+            "expense_type": str(claim.expense_type or ""),
+            "amount": self._money_text(claim.amount),
+            "currency": str(claim.currency or "CNY"),
+            "previous_status": str(previous_status or ""),
+            "previous_approval_stage": str(previous_approval_stage or ""),
+            "next_status": str(claim.status or ""),
+            "next_approval_stage": str(claim.approval_stage or ""),
+        }
+        payload.update(extra_payload or {})
+
+        normalized_correlation_id = self.normalize_correlation_id(correlation_id)
+        normalized_idempotency_key = self._normalize_idempotency_key(
+            idempotency_key or normalized_correlation_id
+        )
+        existing_event = self.db.scalar(
+            select(BusinessEvent).where(
+                BusinessEvent.tenant_id == normalized_tenant,
+                BusinessEvent.aggregate_type == "expense_claim",
+                BusinessEvent.aggregate_id == claim.id,
+                BusinessEvent.event_type == str(event_type).strip(),
+                BusinessEvent.idempotency_key == normalized_idempotency_key,
+            )
+        )
+        if existing_event is not None:
+            return expense_case, existing_event
+
+        event = BusinessEvent(
+            id=str(uuid.uuid4()),
+            tenant_id=normalized_tenant,
+            expense_case_id=expense_case.id,
+            aggregate_type="expense_claim",
+            aggregate_id=claim.id,
+            event_type=str(event_type).strip(),
+            event_version=1,
+            idempotency_key=normalized_idempotency_key,
+            correlation_id=normalized_correlation_id,
+            causation_id=self.normalize_correlation_id(causation_id) if causation_id else None,
+            actor_id=str(actor_id or "system").strip() or "system",
+            actor_type="system" if str(actor_id or "").strip() == "system" else "user",
+            payload_json=payload,
+            delivery_status="pending",
+            occurred_at=datetime.now(UTC),
+        )
+        self.db.add(event)
+        self.db.flush()
+        return expense_case, event
+
+    @staticmethod
+    def _normalize_idempotency_key(value: str) -> str:
+        text = str(value or "").strip()
+        if not text:
+            raise ValueError("业务事件必须提供幂等键。")
+        if len(text) <= 120:
+            return text
+        digest = hashlib.sha256(text.encode("utf-8")).hexdigest()
+        return f"sha256:{digest}"
+
+    def get_timeline_for_claim(
+        self,
+        claim_id: str,
+        *,
+        tenant_id: str | None = None,
+    ) -> ExpenseCase | None:
+        normalized_tenant = self.normalize_tenant_id(tenant_id)
+        link = self.db.scalar(
+            select(ExpenseCaseLink).where(
+                ExpenseCaseLink.resource_type == "expense_claim",
+                ExpenseCaseLink.resource_id == claim_id,
+            )
+        )
+        if link is None or link.tenant_id != normalized_tenant:
+            return None
+        return self.db.scalar(
+            select(ExpenseCase)
+            .options(selectinload(ExpenseCase.links), selectinload(ExpenseCase.events))
+            .where(
+                ExpenseCase.id == link.expense_case_id,
+                ExpenseCase.tenant_id == normalized_tenant,
+            )
+        )
+
+    @staticmethod
+    def _money_text(value: Decimal | None) -> str:
+        return f"{Decimal(value or Decimal('0.00')).quantize(Decimal('0.01')):.2f}"
+
+    @staticmethod
+    def _scene_code(claim: ExpenseClaim) -> str:
+        expense_type = str(claim.expense_type or "").strip().lower()
+        return expense_type.removesuffix("_application") or "other"
+
+    @staticmethod
+    def _case_title(claim: ExpenseClaim) -> str:
+        reason = str(claim.reason or "").strip()
+        return reason[:200] or f"费用事件 {claim.claim_no}"
+
+    @classmethod
+    def _relation_type(cls, claim: ExpenseClaim) -> str:
+        claim_no = str(claim.claim_no or "").strip()
+        expense_type = str(claim.expense_type or "").strip().lower()
+        is_application = (
+            is_application_claim_no(claim_no)
+            or expense_type == "application"
+            or expense_type.endswith("_application")
+        )
+        return "application" if is_application else "claim"
+
+    @classmethod
+    def _stage_for_claim(cls, claim: ExpenseClaim) -> str:
+        status = str(claim.status or "").strip().lower()
+        if status in {"pending_payment"}:
+            return "paying"
+        if status in {"paid"}:
+            return "accounting"
+        if status in {"completed"}:
+            return "closed"
+        if status in {"submitted", "approved"}:
+            if cls._relation_type(claim) == "application" and status == "approved":
+                return "approved_to_spend"
+            return "reviewing"
+        return "claiming"
+
+    @staticmethod
+    def _case_status_for_claim(claim: ExpenseClaim) -> str:
+        status = str(claim.status or "").strip().lower()
+        if status in {"cancelled", "voided", "rejected"}:
+            return "cancelled"
+        if status == "completed":
+            return "closed"
+        return "active"

server/src/app/services/expense_claim_application_handoff.py

@@ -238,6 +238,10 @@ class ExpenseClaimApplicationHandoffMixin:
                 {
                     "application_claim_id": application_claim.id,
                     "application_claim_no": str(application_claim.claim_no or "").strip(),
+                    "archive_event_id": str(archive_flag.get("archive_event_id") or ""),
+                    "previous_status": previous_status,
+                    "previous_approval_stage": previous_stage,
+                    "next_status": "approved",
                     "next_approval_stage": APPLICATION_ARCHIVE_STAGE,
                 }
             )
@@ -248,6 +252,7 @@ class ExpenseClaimApplicationHandoffMixin:
                 resource_id=application_claim.id,
                 before_json=before_json,
                 after_json=self._serialize_claim(application_claim),
+                commit=False,
             )
 
         return archived_applications
@@ -396,6 +401,7 @@ class ExpenseClaimApplicationHandoffMixin:
                 resource_id=application_claim.id,
                 before_json=before_json,
                 after_json=self._serialize_claim(application_claim),
+                commit=False,
             )
 
         return synced_applications

server/src/app/services/expense_claim_approval_flow.py

@@ -6,6 +6,7 @@ from decimal import Decimal, InvalidOperation
 from typing import Any
 
 from app.api.deps import CurrentUserContext
+from app.models.financial_record import ExpenseClaim
 from app.services.budget import BudgetService
 from app.services.expense_claim_workflow_constants import (
     APPLICATION_LINK_STATUS_STAGE,
@@ -45,6 +46,7 @@ class ExpenseClaimApprovalFlowMixin:
         next_budget_manager = None
         merged_budget_approval = False
         route_decision_flag: dict[str, Any] | None = None
+        generated_draft = None
         if previous_stage == DIRECT_MANAGER_APPROVAL_STAGE:
             if not self._access_policy.can_approve_claim(current_user, claim):
                 raise ValueError("只有当前直属领导审批人可以审批通过该单据。")
@@ -254,6 +256,48 @@ class ExpenseClaimApprovalFlowMixin:
             business_stage=business_stage,
         )
 
+        correlation_id = str(approval_flag.get("approval_event_id") or uuid.uuid4())
+        structured_event_type = "approval_stage_completed"
+        if is_application_claim and next_status == "approved":
+            structured_event_type = "application_approved"
+        elif not is_application_claim and next_status == PAYMENT_PENDING_STATUS:
+            structured_event_type = "claim_approved"
+        expense_case, _event = self._expense_cases.record_claim_event(
+            claim,
+            event_type=structured_event_type,
+            actor_id=current_user.username,
+            tenant_id=getattr(current_user, "tenant_id", None),
+            correlation_id=correlation_id,
+            idempotency_key=correlation_id,
+            previous_status=str(before_json.get("status") or ""),
+            previous_approval_stage=previous_stage,
+            extra_payload={
+                "workflow_event_type": event_type,
+                "opinion": approval_opinion,
+                "route_requires_budget_review": bool(
+                    route_decision_flag and route_decision_flag.get("requires_budget_review")
+                ),
+            },
+        )
+        if generated_draft is not None:
+            self._expense_cases.record_claim_event(
+                generated_draft,
+                event_type="reimbursement_draft_generated",
+                actor_id="system",
+                tenant_id=getattr(current_user, "tenant_id", None),
+                correlation_id=correlation_id,
+                idempotency_key=correlation_id,
+                causation_id=_event.id,
+                previous_status="",
+                previous_approval_stage="",
+                extra_payload={
+                    "application_claim_id": claim.id,
+                    "application_claim_no": claim.claim_no,
+                },
+                expense_case=expense_case,
+                relation_type="generated_reimbursement",
+            )
+
         self.db.commit()
         self.db.refresh(claim)
         self._access_policy.attach_budget_approval_snapshot(claim)
@@ -326,6 +370,47 @@ class ExpenseClaimApprovalFlowMixin:
         claim.approval_stage = PAYMENT_PAID_STAGE
         claim.risk_flags_json = [*list(claim.risk_flags_json or []), payment_flag]
 
+        payment_correlation_id = str(payment_flag.get("payment_event_id") or uuid.uuid4())
+        expense_case, payment_event = self._expense_cases.record_claim_event(
+            claim,
+            event_type="payment_completed",
+            actor_id=current_user.username,
+            tenant_id=getattr(current_user, "tenant_id", None),
+            correlation_id=payment_correlation_id,
+            idempotency_key=payment_correlation_id,
+            previous_status=str(before_json.get("status") or ""),
+            previous_approval_stage=previous_stage,
+            extra_payload={"archived_applications": archived_applications},
+        )
+        for archived_application in archived_applications:
+            application_claim = self.db.get(
+                ExpenseClaim,
+                str(archived_application.get("application_claim_id") or ""),
+            )
+            if application_claim is None:
+                raise RuntimeError("付款关联的申请单已不存在，无法记录归档事件。")
+            archive_event_id = str(archived_application.get("archive_event_id") or "").strip()
+            self._expense_cases.record_claim_event(
+                application_claim,
+                event_type="application_archived",
+                actor_id=current_user.username,
+                tenant_id=getattr(current_user, "tenant_id", None),
+                correlation_id=payment_correlation_id,
+                idempotency_key=archive_event_id,
+                causation_id=payment_event.id,
+                previous_status=str(archived_application.get("previous_status") or ""),
+                previous_approval_stage=str(
+                    archived_application.get("previous_approval_stage") or ""
+                ),
+                extra_payload={
+                    "reimbursement_claim_id": claim.id,
+                    "reimbursement_claim_no": claim.claim_no,
+                },
+                expense_case=expense_case,
+                relation_type="application",
+                update_case_state=False,
+            )
+
         self.db.commit()
         self.db.refresh(claim)
 

server/src/app/services/expense_claim_draft_flow.py

@@ -1020,6 +1020,15 @@ class ExpenseClaimDraftFlowMixin(ExpenseClaimApplicationLinkMixin, ExpenseClaimD
                 self._sync_claim_from_items(claim)
             if locked_expense_type:
                 claim.expense_type = locked_expense_type
+            self._expense_cases.record_claim_event(
+                claim,
+                event_type=("claim_draft_created" if is_new_claim else "claim_draft_updated"),
+                actor_id=user_id or claim.employee_name or "system",
+                correlation_id=run_id,
+                idempotency_key=run_id,
+                previous_status=str((before_json or {}).get("status") or ""),
+                previous_approval_stage=str((before_json or {}).get("approval_stage") or ""),
+            )
             self.db.commit()
             self.db.refresh(claim)
         except IntegrityError as exc:
@@ -1066,4 +1075,3 @@ class ExpenseClaimDraftFlowMixin(ExpenseClaimApplicationLinkMixin, ExpenseClaimD
             "amount": float(claim.amount),
             "invoice_count": int(claim.invoice_count or 0),
         }
-

server/src/app/services/expense_claims.py

@@ -115,6 +115,7 @@ from app.services.expense_claim_constants import (
     TRAVEL_POLICY_HOTEL_NIGHT_PATTERN,
     STANDARD_ADJUSTMENT_RISK_SOURCE,
 )
+from app.services.expense_cases import ExpenseCaseService
 from app.services.expense_claim_risk_review import ExpenseClaimRiskReviewMixin
 from app.services.expense_amounts import (
     extract_amount_candidates,
@@ -645,6 +646,20 @@ class ExpenseClaimItemActionMixin:
 
         claim.risk_flags_json = dedupe_claim_risk_flags(claim.risk_flags_json)
 
+        self._expense_cases.record_claim_event(
+            claim,
+            event_type=("application_submitted" if is_application_claim else "claim_submitted"),
+            actor_id=current_user.username,
+            tenant_id=getattr(current_user, "tenant_id", None),
+            idempotency_key=(
+                f"submit:{claim.id}:{claim.submitted_at.isoformat()}"
+                if claim.submitted_at is not None
+                else f"submit:{claim.id}:{before_json.get('status') or 'draft'}"
+            ),
+            previous_status=str(before_json.get("status") or ""),
+            previous_approval_stage=str(before_json.get("approval_stage") or ""),
+        )
+
         self.db.commit()
         self.db.refresh(claim)
 
@@ -843,6 +858,20 @@ class ExpenseClaimItemActionMixin:
             business_stage="expense_application" if is_application_claim else "reimbursement",
         )
 
+        self._expense_cases.record_claim_event(
+            claim,
+            event_type=("application_returned" if is_application_claim else "claim_returned"),
+            actor_id=current_user.username,
+            tenant_id=getattr(current_user, "tenant_id", None),
+            idempotency_key=str(return_flag.get("return_event_id") or ""),
+            previous_status=previous_status,
+            previous_approval_stage=previous_stage,
+            extra_payload={
+                "reason": message,
+                "reason_codes": normalized_reason_codes,
+            },
+        )
+
         self.db.commit()
         self.db.refresh(claim)
 
@@ -862,6 +891,7 @@ class ExpenseClaimService(ExpenseClaimStandardAdjustmentMixin, ExpenseClaimItemA
     def __init__(self, db: Session) -> None:
         self.db = db
         self.audit_service = AuditLogService(db)
+        self._expense_cases = ExpenseCaseService(db)
         self._access_policy = ExpenseClaimAccessPolicy(db)
         self._attachment_storage = ExpenseClaimAttachmentStorage()
         self._attachment_presentation = ExpenseClaimAttachmentPresentation(self._attachment_storage)