时光日记媒体多对多表 保留外键关系，取消外键约束

Roomumy/models.py

@@ -123,8 +123,8 @@ class TimeDiary(models.Model):
 
 class DiaryAlbumMediaRelation(models.Model):
     id = models.AutoField(primary_key=True)
-    diary = models.ForeignKey(TimeDiary, on_delete=models.CASCADE, db_index=True, verbose_name="日记")
-    album_media = models.ForeignKey(AlbumMedia, on_delete=models.CASCADE, db_index=True, verbose_name="相册媒体")
+    diary = models.ForeignKey(TimeDiary, on_delete=models.CASCADE, db_index=True, db_constraint=False, verbose_name="日记")
+    album_media = models.ForeignKey(AlbumMedia, on_delete=models.CASCADE, db_index=True, db_constraint=False, verbose_name="相册媒体")
     created_time = models.IntegerField(default=0, verbose_name='创建时间')
     updated_time = models.IntegerField(default=0, verbose_name='更新时间')