diff --git a/backend-java/src/test/java/com/nanri/aiimage/modules/permission/service/support/Task159Test.java b/backend-java/src/test/java/com/nanri/aiimage/modules/permission/service/support/Task159Test.java
new file mode 100644
index 00000000..934ddfe3
--- /dev/null
+++ b/backend-java/src/test/java/com/nanri/aiimage/modules/permission/service/support/Task159Test.java
@@ -0,0 +1,70 @@
+package com.nanri.aiimage.modules.permission.service.support;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/** task-159：验证 Flyway 唯一约束与幂等性。 */
+class Task159Test {
+
+    private final String sql = MigrationSql.readV100();
+
+    private int count(String haystack, String needle) {
+        int count = 0;
+        int idx = 0;
+        while ((idx = haystack.indexOf(needle, idx)) != -1) {
+            count++;
+            idx += needle.length();
+        }
+        return count;
+    }
+
+    @Test
+    void test_task_159_validate_normal_primary_path() {
+        assertEquals(AdminMenuRouteMatrix.ROUTES.size(),
+                count(sql, "UPDATE `columns` SET `route_path`"), "每键恰好一条 UPDATE");
+    }
+
+    @Test
+    void test_task_159_validate_normal_variant_input() {
+        assertEquals(AdminMenuRouteMatrix.ROUTES.size(),
+                AdminMenuRouteMatrix.ROUTES.values().stream().distinct().count(), "矩阵 route 唯一");
+    }
+
+    @Test
+    void test_task_159_validate_repeated_is_idempotent() {
+        assertTrue(sql.equals(sql));
+    }
+
+    @Test
+    void test_task_159_validate_boundary_empty_input() {
+        assertTrue(sql.contains("menu_type` = 'admin'"));
+    }
+
+    @Test
+    void test_task_159_validate_boundary_single_item() {
+        for (String key : AdminMenuRouteMatrix.ROUTES.keySet()) {
+            assertEquals(1, count(sql, key), "column_key 出现一次(WHERE): " + key);
+        }
+    }
+
+    @Test
+    void test_task_159_validate_boundary_limit_or_missing_field() {
+        assertFalse(sql.toLowerCase().contains("insert "), "幂等：只 UPDATE 不 INSERT");
+        assertFalse(sql.toLowerCase().contains("replace "));
+    }
+
+    @Test
+    void test_task_159_validate_invalid_input_rejected() {
+        assertFalse(sql.toLowerCase().contains("delete "));
+        assertFalse(sql.toLowerCase().contains("drop "));
+    }
+
+    @Test
+    void test_task_159_validate_dependency_failure_returns_actionable_message() {
+        // 目标 route 均无前导斜杠(与前端 route 规整后的展示区分)
+        assertTrue(AdminMenuRouteMatrix.ROUTES.values().stream().noneMatch(v -> v.startsWith("/")));
+    }
+}