feat(G2-1,G2-2,G2-3): 扩展预算编号与工作流跨域桥接

server/prisma/schema.prisma

@@ -410,6 +410,7 @@ model LegalEntity {
   employees                Employee[]
   holiday_calendars        HolidayCalendar[] @relation("HolidayCalendarLegalEntity")
   suppliers                Supplier[]
+  budget_pools             BudgetPool[]      @relation("BudgetPoolLegalEntity")
 
   @@index([enabled, archived_at], map: "idx_legal_entities_status")
   @@index([default_holiday_calendar_id], map: "idx_legal_entities_default_calendar")
@@ -435,6 +436,7 @@ model CostCenter {
   parent         CostCenter?  @relation("CostCenterToParent", fields: [parent_id], references: [id], onDelete: Restrict)
   children       CostCenter[] @relation("CostCenterToParent")
   owner_employee Employee?    @relation("CostCenterOwner", fields: [owner_employee_id], references: [id], onDelete: SetNull)
+  budget_pools   BudgetPool[] @relation("BudgetPoolCostCenter")
 
   @@unique([legal_entity_id, code], map: "legal_entity_cost_center_code_ux")
   @@index([legal_entity_id, enabled, archived_at], map: "idx_cost_centers_legal_entity_status")
@@ -824,6 +826,8 @@ model BudgetPool {
   code                      String    @unique
   name                      String
   department_id             String?   @db.Uuid
+  legal_entity_id           String?   @db.Uuid
+  cost_center_id            String?   @db.Uuid
   status                    String    @default("active") @db.VarChar(16)
   period_start              DateTime  @db.Date
   period_end                DateTime  @db.Date
@@ -838,9 +842,12 @@ model BudgetPool {
   updated_by String?  @db.Uuid
 
   department     Department?         @relation(fields: [department_id], references: [id], onDelete: SetNull)
+  legal_entity   LegalEntity?        @relation("BudgetPoolLegalEntity", fields: [legal_entity_id], references: [id], onDelete: SetNull)
+  cost_center    CostCenter?         @relation("BudgetPoolCostCenter", fields: [cost_center_id], references: [id], onDelete: SetNull)
   ledger_entries BudgetLedgerEntry[]
 
   @@index([department_id, status], map: "idx_budget_pools_department_status")
+  @@index([legal_entity_id, cost_center_id, status], map: "idx_budget_pools_scope_status")
   @@index([status, period_start, period_end], map: "idx_budget_pools_period")
   @@map("budget_pools")
 }
@@ -849,6 +856,8 @@ model BudgetLedgerEntry {
   id               String   @id @default(uuid()) @db.Uuid
   budget_pool_id   String   @db.Uuid
   reimbursement_id String?  @db.Uuid
+  entity_type      String?  @db.VarChar(32)
+  entity_id        String?  @db.Uuid
   kind             String   @db.VarChar(32)
   amount           Decimal  @db.Decimal(14, 2)
   note             String?
@@ -860,6 +869,7 @@ model BudgetLedgerEntry {
 
   @@index([budget_pool_id, created_at], map: "idx_budget_ledger_pool_created_at")
   @@index([reimbursement_id])
+  @@index([entity_type, entity_id], map: "idx_budget_ledger_entity")
   @@map("budget_ledger_entries")
 }
 
@@ -969,18 +979,19 @@ model WorkflowDefinition {
 }
 
 model WorkflowInstance {
-  id               String                 @id @default(uuid()) @db.Uuid
-  workflow_id      String                 @db.Uuid
-  entity_type      String
-  entity_id        String                 @db.Uuid
-  reimbursement_id String?                @db.Uuid
-  leave_request_id String?                @db.Uuid
-  submitter_id     String                 @db.Uuid
-  current_status   WorkflowInstanceStatus @default(pending)
-  current_step_id  String
-  context_data     Json
-  started_at       DateTime               @default(now())
-  completed_at     DateTime?
+  id                  String                 @id @default(uuid()) @db.Uuid
+  workflow_id         String                 @db.Uuid
+  entity_type         String
+  entity_id           String                 @db.Uuid
+  reimbursement_id    String?                @db.Uuid
+  leave_request_id    String?                @db.Uuid
+  purchase_request_id String?                @db.Uuid
+  submitter_id        String                 @db.Uuid
+  current_status      WorkflowInstanceStatus @default(pending)
+  current_step_id     String
+  context_data        Json
+  started_at          DateTime               @default(now())
+  completed_at        DateTime?
 
   created_at DateTime @default(now())
   created_by String?  @db.Uuid
@@ -1003,6 +1014,7 @@ model WorkflowInstance {
   @@index([entity_type, entity_id])
   @@index([reimbursement_id])
   @@index([leave_request_id])
+  @@index([purchase_request_id])
   @@index([current_status])
   @@index([submitter_id])
   @@index([context_department_id])