diff --git a/server/models/Book.js b/server/models/Book.js
index 415064de..d478587c 100644
--- a/server/models/Book.js
+++ b/server/models/Book.js
@@ -1,11 +1,28 @@
 const { DataTypes, Model } = require('sequelize')
 const Logger = require('../Logger')
 
+/**
+ * @typedef EBookFileObject
+ * @property {string} ino
+ * @property {string} ebookFormat
+ * @property {number} addedAt
+ * @property {number} updatedAt
+ * @property {{filename:string, ext:string, path:string, relPath:string, size:number, mtimeMs:number, ctimeMs:number, birthtimeMs:number}} metadata
+ */
+
+/**
+ * @typedef ChapterObject
+ * @property {number} id
+ * @property {number} start
+ * @property {number} end
+ * @property {string} title
+ */
+
 class Book extends Model {
   constructor(values, options) {
     super(values, options)
 
-    /** @type {UUIDV4} */
+    /** @type {string} */
     this.id
     /** @type {string} */
     this.title
@@ -33,17 +50,17 @@ class Book extends Model {
     this.coverPath
     /** @type {number} */
     this.duration
-    /** @type {Object} */
+    /** @type {string[]} */
     this.narrators
     /** @type {Object} */
     this.audioFiles
-    /** @type {Object} */
+    /** @type {EBookFileObject} */
     this.ebookFile
-    /** @type {Object} */
+    /** @type {ChapterObject[]} */
     this.chapters
-    /** @type {Object} */
+    /** @type {string[]} */
     this.tags
-    /** @type {Object} */
+    /** @type {string[]} */
     this.genres
     /** @type {Date} */
     this.updatedAt
diff --git a/server/models/LibraryItem.js b/server/models/LibraryItem.js
index 12e87448..c9bded99 100644
--- a/server/models/LibraryItem.js
+++ b/server/models/LibraryItem.js
@@ -4,12 +4,20 @@ const oldLibraryItem = require('../objects/LibraryItem')
 const libraryFilters = require('../utils/queries/libraryFilters')
 const { areEquivalent } = require('../utils/index')
 
+/**
+ * @typedef LibraryFileObject
+ * @property {string} ino
+ * @property {boolean} isSupplementary
+ * @property {number} addedAt
+ * @property {number} updatedAt
+ * @property {{filename:string, ext:string, path:string, relPath:string, size:number, mtimeMs:number, ctimeMs:number, birthtimeMs:number}} metadata
+ */
 
 class LibraryItem extends Model {
   constructor(values, options) {
     super(values, options)
 
-    /** @type {UUIDV4} */
+    /** @type {string} */
     this.id
     /** @type {string} */
     this.ino
@@ -17,7 +25,7 @@ class LibraryItem extends Model {
     this.path
     /** @type {string} */
     this.relPath
-    /** @type {UUIDV4} */
+    /** @type {string} */
     this.mediaId
     /** @type {string} */
     this.mediaType
@@ -39,13 +47,13 @@ class LibraryItem extends Model {
     this.lastScan
     /** @type {string} */
     this.lastScanVersion
-    /** @type {Object} */
+    /** @type {LibraryFileObject[]} */
     this.libraryFiles
     /** @type {Object} */
     this.extraData
-    /** @type {UUIDV4} */
+    /** @type {string} */
     this.libraryId
-    /** @type {UUIDV4} */
+    /** @type {string} */
     this.libraryFolderId
     /** @type {Date} */
     this.createdAt
diff --git a/server/models/Podcast.js b/server/models/Podcast.js
index 06b410cf..60311bfd 100644
--- a/server/models/Podcast.js
+++ b/server/models/Podcast.js
@@ -4,7 +4,7 @@ class Podcast extends Model {
   constructor(values, options) {
     super(values, options)
 
-    /** @type {UUIDV4} */
+    /** @type {string} */
     this.id
     /** @type {string} */
     this.title
@@ -42,9 +42,9 @@ class Podcast extends Model {
     this.maxEpisodesToKeep
     /** @type {string} */
     this.coverPath
-    /** @type {Object} */
+    /** @type {string[]} */
     this.tags
-    /** @type {Object} */
+    /** @type {string[]} */
     this.genres
     /** @type {Date} */
     this.createdAt
diff --git a/server/models/PodcastEpisode.js b/server/models/PodcastEpisode.js
index 2626ee0f..31fda60f 100644
--- a/server/models/PodcastEpisode.js
+++ b/server/models/PodcastEpisode.js
@@ -1,11 +1,19 @@
 const { DataTypes, Model } = require('sequelize')
 const oldPodcastEpisode = require('../objects/entities/PodcastEpisode')
 
+/**
+ * @typedef ChapterObject
+ * @property {number} id
+ * @property {number} start
+ * @property {number} end
+ * @property {string} title
+ */
+
 class PodcastEpisode extends Model {
   constructor(values, options) {
     super(values, options)
 
-    /** @type {UUIDV4} */
+    /** @type {string} */
     this.id
     /** @type {number} */
     this.index
@@ -33,11 +41,11 @@ class PodcastEpisode extends Model {
     this.publishedAt
     /** @type {Object} */
     this.audioFile
-    /** @type {Object} */
+    /** @type {ChapterObject[]} */
     this.chapters
     /** @type {Object} */
     this.extraData
-    /** @type {UUIDV4} */
+    /** @type {string} */
     this.podcastId
     /** @type {Date} */
     this.createdAt