diff --git a/src/main/java/com/imyeyu/api/modules/common/bean/MediaAttach.java b/src/main/java/com/imyeyu/api/modules/common/bean/MediaAttach.java
index 177a3da..25365d0 100644
--- a/src/main/java/com/imyeyu/api/modules/common/bean/MediaAttach.java
+++ b/src/main/java/com/imyeyu/api/modules/common/bean/MediaAttach.java
@@ -1,7 +1,5 @@
 package com.imyeyu.api.modules.common.bean;
 
-import lombok.Data;
-
 /**
  * @author 夜雨
  * @since 2025-10-20 15:04
@@ -18,22 +16,4 @@ public class MediaAttach {
 
 		THUMB
 	}
-
-	/**
-	 *
-	 *
-	 * @author 夜雨
-	 * @since 2025-10-20 15:04
-	 */
-	@Data
-	public static class ExtData {
-
-		private Long sourceId;
-
-		private String sourceMongoId;
-
-		private boolean isImage;
-
-		private boolean isVideo;
-	}
 }
diff --git a/src/main/java/com/imyeyu/api/modules/common/bean/Metadata.java b/src/main/java/com/imyeyu/api/modules/common/bean/Metadata.java
index dfad00b..84ef59d 100644
--- a/src/main/java/com/imyeyu/api/modules/common/bean/Metadata.java
+++ b/src/main/java/com/imyeyu/api/modules/common/bean/Metadata.java
@@ -1,6 +1,7 @@
 package com.imyeyu.api.modules.common.bean;
 
 import lombok.Data;
+import lombok.EqualsAndHashCode;
 
 /**
  * @author 夜雨
@@ -9,7 +10,7 @@ import lombok.Data;
 public class Metadata {
 
 	/**
-	 *
+	 * 图片
 	 *
 	 * @author 夜雨
 	 * @since 2025-12-11 18:15
@@ -21,4 +22,21 @@ public class Metadata {
 
 		private int height;
 	}
+
+	/**
+	 * 缩略图
+	 *
+	 * @author 夜雨
+	 * @since 2026-01-04 18:10
+	 */
+	@Data
+	@EqualsAndHashCode(callSuper = true)
+	public static class ThumbImage extends Image {
+
+		private long sourceId;
+
+		private String sourceMongoId;
+
+		private String sourceMimeType;
+	}
 }
diff --git a/src/main/java/com/imyeyu/api/modules/common/entity/Attachment.java b/src/main/java/com/imyeyu/api/modules/common/entity/Attachment.java
index 0feb0dc..01aada5 100644
--- a/src/main/java/com/imyeyu/api/modules/common/entity/Attachment.java
+++ b/src/main/java/com/imyeyu/api/modules/common/entity/Attachment.java
@@ -79,8 +79,6 @@ public class Attachment extends Entity implements MultilingualHandler {
 
 	protected String md5;
 
-	protected String ext;
-
 	protected Long destroyAt;
 
 	@Transient
diff --git a/src/main/java/com/imyeyu/api/modules/common/service/implement/AttachmentServiceImplement.java b/src/main/java/com/imyeyu/api/modules/common/service/implement/AttachmentServiceImplement.java
index 155b8ca..02cdbb8 100644
--- a/src/main/java/com/imyeyu/api/modules/common/service/implement/AttachmentServiceImplement.java
+++ b/src/main/java/com/imyeyu/api/modules/common/service/implement/AttachmentServiceImplement.java
@@ -1,6 +1,7 @@
 package com.imyeyu.api.modules.common.service.implement;
 
 import com.google.gson.Gson;
+import com.google.gson.JsonObject;
 import com.imyeyu.api.config.dbsource.TimiServerDBConfig;
 import com.imyeyu.api.modules.common.bean.MediaAttach;
 import com.imyeyu.api.modules.common.bean.Metadata;
@@ -90,10 +91,10 @@ public class AttachmentServiceImplement extends AbstractEntityService<Attachment
 			attachment.setMimeType(new Tika().detect(gridFSBucket.openDownloadStream(gridFSFile.getObjectId())));
 			if (attachment.getMimeType().startsWith("image")) {
 				BufferedImage image = ImageIO.read(gridFSBucket.openDownloadStream(gridFSFile.getObjectId()));
-				Metadata.Image metadata = new Metadata.Image();
-				metadata.setWidth(image.getWidth());
-				metadata.setHeight(image.getHeight());
-				attachment.setMetadata(gson.toJsonTree(metadata).getAsJsonObject());
+				attachment.setMetadata(TimiJava.defaultIfNull(attachment.getMetadata(), new JsonObject()));
+				JsonObject metadata = attachment.getMetadata();
+				metadata.addProperty("width", image.getWidth());
+				metadata.addProperty("height", image.getHeight());
 			}
 			mapper.insert(attachment);
 		} catch (Exception e) {
@@ -112,7 +113,9 @@ public class AttachmentServiceImplement extends AbstractEntityService<Attachment
 			Attachment attachment = get(id);
 			gridFsTemplate.delete(Query.query(Criteria.where("_id").is(attachment.getMongoId())));
 
-			attachment.setDeletedAt(Time.now());
+			if (!attachment.isDeleted()) {
+				attachment.setDeletedAt(Time.now());
+			}
 			attachment.setDestroyAt(Time.now());
 			mapper.update(attachment);
 		} catch (Exception e) {
@@ -132,13 +135,11 @@ public class AttachmentServiceImplement extends AbstractEntityService<Attachment
 			// 生成缩略图
 			InputStream mimeStream = getInputStreamByMongoId(attachment.getMongoId());
 			String mimeType = new Tika().detect(mimeStream);
-			boolean isImage = false;
 
 			InputStream sourceStream = getInputStreamByMongoId(attachment.getMongoId());
 			ByteArrayOutputStream thumbStream = new ByteArrayOutputStream();
 			switch (mimeType) {
 				case "image/png", "image/bmp", "image/jpeg" -> {
-					isImage = true;
 					Thumbnails.of(sourceStream).width(256).keepAspectRatio(true).toOutputStream(thumbStream);
 				}
 				case "video/mp4", "video/quicktime" -> {
@@ -155,18 +156,17 @@ public class AttachmentServiceImplement extends AbstractEntityService<Attachment
 					}
 				}
 			}
-			MediaAttach.ExtData extData = new MediaAttach.ExtData();
-			extData.setImage(isImage);
-			extData.setVideo(!isImage);
-			extData.setSourceId(attachment.getId());
-			extData.setSourceMongoId(attachment.getMongoId());
+			Metadata.ThumbImage thumbMetadata = new Metadata.ThumbImage();
+			thumbMetadata.setSourceId(attachment.getId());
+			thumbMetadata.setSourceMongoId(attachment.getMongoId());
+			thumbMetadata.setSourceMimeType(mimeType);
 
 			Attachment thumbAttach = new Attachment();
 			thumbAttach.setName(Network.simpleURIFileName(attachment.getName()) + ".png");
 			thumbAttach.setBizType(attachment.getBizType());
 			thumbAttach.setBizId(attachment.getBizId());
 			thumbAttach.setAttachTypeValue(MediaAttach.Type.THUMB);
-			thumbAttach.setExt(gson.toJson(extData));
+			thumbAttach.setMetadata(gson.toJsonTree(thumbMetadata).getAsJsonObject());
 			thumbAttach.setInputStream(new ByteArrayInputStream(thumbStream.toByteArray()));
 			create(thumbAttach);
 
@@ -182,8 +182,8 @@ public class AttachmentServiceImplement extends AbstractEntityService<Attachment
 	public void deleteMedia(Long thumbId) throws TimiException {
 		Attachment attachment = get(thumbId);
 		delete(attachment.getId());
-		MediaAttach.ExtData data = gson.fromJson(attachment.getExt(), MediaAttach.ExtData.class);
-		delete(data.getSourceId());
+		Metadata.ThumbImage thumbMetadata = gson.fromJson(attachment.getMetadata(), Metadata.ThumbImage.class);
+		delete(thumbMetadata.getSourceId());
 	}
 
 	@Override
diff --git a/src/main/java/com/imyeyu/api/modules/journal/service/implement/JournalServiceImplement.java b/src/main/java/com/imyeyu/api/modules/journal/service/implement/JournalServiceImplement.java
index 0a2b3c0..01b2a4d 100644
--- a/src/main/java/com/imyeyu/api/modules/journal/service/implement/JournalServiceImplement.java
+++ b/src/main/java/com/imyeyu/api/modules/journal/service/implement/JournalServiceImplement.java
@@ -3,6 +3,7 @@ package com.imyeyu.api.modules.journal.service.implement;
 import com.google.gson.Gson;
 import com.imyeyu.api.config.dbsource.TimiServerDBConfig;
 import com.imyeyu.api.modules.common.bean.MediaAttach;
+import com.imyeyu.api.modules.common.bean.Metadata;
 import com.imyeyu.api.modules.common.bean.TempFileMetaData;
 import com.imyeyu.api.modules.common.entity.Attachment;
 import com.imyeyu.api.modules.common.service.AttachmentService;
@@ -196,8 +197,8 @@ public class JournalServiceImplement extends AbstractEntityService<Journal, Long
 				thumbAttach.setBizId(journal.getId());
 				attachmentService.update(thumbAttach);
 
-				MediaAttach.ExtData extData = gson.fromJson(thumbAttach.getExt(), MediaAttach.ExtData.class);
-				Attachment sourceAttach = attachmentService.get(extData.getSourceId());
+				Metadata.ThumbImage thumbMetadata = gson.fromJson(thumbAttach.getMetadata(), Metadata.ThumbImage.class);
+				Attachment sourceAttach = attachmentService.get(thumbMetadata.getSourceId());
 				sourceAttach.setBizType(Attachment.BizType.JOURNAL);
 				sourceAttach.setBizId(journal.getId());
 				attachmentService.update(sourceAttach);