feat: store file size of videos

pom-dependency-tree.txt

@@ -1,4 +1,4 @@
-ai.elimu:webapp:war:2.5.104-SNAPSHOT
+ai.elimu:webapp:war:2.5.108-SNAPSHOT
 +- ai.elimu:model:jar:model-2.0.97:compile
 |  \- com.google.code.gson:gson:jar:2.13.0:compile
 |     \- com.google.errorprone:error_prone_annotations:jar:2.37.0:compile

src/main/java/ai/elimu/entity/content/multimedia/Video.java

@@ -20,6 +20,12 @@ public class Video extends Multimedia {
   @NotNull
   private String title;
 
+  /**
+   * The file size (byte length).
+   */
+  @NotNull
+  private Integer fileSize;
+
   @NotNull
   @Lob
   @Column(length = 209715200) // 200MB

src/main/resources/META-INF/jpa-schema-export.sql

@@ -510,6 +510,7 @@
         bytes longblob,
         checksumGitHub varchar(255),
         checksumMd5 varchar(255),
+        fileSize integer,
         thumbnail mediumblob,
         title varchar(255),
         videoFormat varchar(255),

src/main/resources/db/migration/2005108.sql

@@ -0,0 +1,3 @@
+# 2.5.108
+
+UPDATE `Video` SET `fileSize` = LENGTH(`bytes`);