R56 A1-A6：费用标准管控

server/prisma/migrations/20260408090000_r56_expense_standards/migration.sql

@@ -0,0 +1,34 @@
+CREATE TABLE "expense_standards" (
+    "id" UUID NOT NULL,
+    "expense_type_id" UUID NOT NULL,
+    "name" VARCHAR(100) NOT NULL,
+    "max_amount" DECIMAL(14,2) NOT NULL,
+    "per_unit" VARCHAR(20) NOT NULL DEFAULT 'item',
+    "control_mode" VARCHAR(16) NOT NULL DEFAULT 'warn',
+    "scope_type" VARCHAR(32) NOT NULL DEFAULT 'global',
+    "scope_key" UUID,
+    "enabled" BOOLEAN NOT NULL DEFAULT true,
+    "note" TEXT,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "created_by" UUID,
+    "updated_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_by" UUID,
+
+    CONSTRAINT "expense_standards_pkey" PRIMARY KEY ("id")
+);
+
+ALTER TABLE "expense_standards"
+ADD CONSTRAINT "expense_standards_expense_type_id_fkey"
+FOREIGN KEY ("expense_type_id") REFERENCES "expense_types"("id")
+ON DELETE RESTRICT ON UPDATE CASCADE;
+
+CREATE INDEX "idx_expense_standards_enabled_type"
+ON "expense_standards"("enabled", "expense_type_id");
+
+CREATE UNIQUE INDEX "expense_standards_type_scope_global_ux"
+ON "expense_standards"("expense_type_id", "scope_type")
+WHERE "scope_key" IS NULL;
+
+CREATE UNIQUE INDEX "expense_standards_type_scope_scoped_ux"
+ON "expense_standards"("expense_type_id", "scope_type", "scope_key")
+WHERE "scope_key" IS NOT NULL;