将文件夹命名从拼音改为英文，整理了一些代码，将导入语句迁移到了头部

rank/migrations/0004_dingdanbiaoqian.py

@@ -0,0 +1,26 @@
+# dengji/migrations/0004_dingdanbiaoqian.py
+from django.db import migrations
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dingdan', '0026_fadanfenhonglilv_alter_fadan_shenqingren_shenfen_and_more'),  # 保持你之前的依赖
+        ('dengji', '0003_alter_dashoubiaoxian_bankuai'),
+    ]
+
+    operations = [
+        migrations.RunSQL(
+            sql="""
+                CREATE TABLE IF NOT EXISTS dingdan_biaoqian (
+                    id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
+                    create_time DATETIME(6) NOT NULL,
+                    chenghao_id BIGINT NOT NULL,
+                    dingdan_id VARCHAR(32) NOT NULL,
+                    CONSTRAINT fk_dingdanbiaoqian_chenghao FOREIGN KEY (chenghao_id) REFERENCES chenghao (id),
+                    CONSTRAINT fk_dingdanbiaoqian_dingdan FOREIGN KEY (dingdan_id) REFERENCES dingdan (dingdan_id),
+                    UNIQUE KEY uniq_dingdan_chenghao (dingdan_id, chenghao_id)
+                ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+            """,
+            reverse_sql="DROP TABLE IF EXISTS dingdan_biaoqian;"
+        ),
+    ]