diff --git a/server/Database.js b/server/Database.js
index be81f761..e1963d8d 100644
--- a/server/Database.js
+++ b/server/Database.js
@@ -66,6 +66,11 @@ class Database {
     require('./models/PlaylistMediaItem')(this.sequelize)
     require('./models/Device')(this.sequelize)
     require('./models/PlaybackSession')(this.sequelize)
+    require('./models/PlaybackSessionListenTime')(this.sequelize)
+    require('./models/Feed')(this.sequelize)
+    require('./models/FeedEpisode')(this.sequelize)
+    require('./models/Setting')(this.sequelize)
+    require('./models/LibrarySetting')(this.sequelize)
 
     return this.sequelize.sync()
   }
diff --git a/server/models/AudioTrack.js b/server/models/AudioTrack.js
index 9dbf05fa..3fde96d0 100644
--- a/server/models/AudioTrack.js
+++ b/server/models/AudioTrack.js
@@ -30,6 +30,10 @@ module.exports = (sequelize) => {
   })
 
   const { Book, PodcastEpisode, FileMetadata } = sequelize.models
+
+  FileMetadata.hasOne(AudioTrack)
+  AudioTrack.belongsTo(FileMetadata)
+
   Book.hasMany(AudioTrack, {
     foreignKey: 'mediaItemId',
     constraints: false,
@@ -64,8 +68,5 @@ module.exports = (sequelize) => {
     }
   })
 
-  FileMetadata.hasOne(AudioTrack)
-  AudioTrack.belongsTo(FileMetadata)
-
   return AudioTrack
 }
\ No newline at end of file
diff --git a/server/models/Feed.js b/server/models/Feed.js
new file mode 100644
index 00000000..30ba6e32
--- /dev/null
+++ b/server/models/Feed.js
@@ -0,0 +1,113 @@
+const { DataTypes, Model } = require('sequelize')
+
+const uppercaseFirst = str => `${str[0].toUpperCase()}${str.substr(1)}`
+
+/*
+ * Polymorphic association: https://sequelize.org/docs/v6/advanced-association-concepts/polymorphic-associations/
+ * Feeds can be created from LibraryItem, Collection, Playlist or Series
+ */
+module.exports = (sequelize) => {
+  class Feed extends Model {
+    getEntity(options) {
+      if (!this.entityType) return Promise.resolve(null)
+      const mixinMethodName = `get${uppercaseFirst(this.entityType)}`
+      return this[mixinMethodName](options)
+    }
+  }
+
+  Feed.init({
+    id: {
+      type: DataTypes.UUID,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true
+    },
+    slug: DataTypes.STRING,
+    entityType: DataTypes.STRING,
+    entityId: DataTypes.UUIDV4,
+    entityUpdatedAt: DataTypes.DATE,
+    serverAddress: DataTypes.STRING,
+    feedURL: DataTypes.STRING,
+    imageURL: DataTypes.STRING,
+    siteURL: DataTypes.STRING,
+    title: DataTypes.STRING,
+    description: DataTypes.TEXT,
+    author: DataTypes.STRING,
+    podcastType: DataTypes.STRING,
+    language: DataTypes.STRING,
+    ownerName: DataTypes.STRING,
+    ownerEmail: DataTypes.STRING,
+    explicit: DataTypes.BOOLEAN,
+    preventIndexing: DataTypes.BOOLEAN
+  }, {
+    sequelize,
+    modelName: 'Feed'
+  })
+
+  const { User, LibraryItem, Collection, Series, Playlist } = sequelize.models
+
+  User.hasMany(Feed)
+  Feed.belongsTo(User)
+
+  LibraryItem.hasMany(Feed, {
+    foreignKey: 'entityId',
+    constraints: false,
+    scope: {
+      entityType: 'libraryItem'
+    }
+  })
+  Feed.belongsTo(LibraryItem, { foreignKey: 'entityId', constraints: false })
+
+  Collection.hasMany(Feed, {
+    foreignKey: 'entityId',
+    constraints: false,
+    scope: {
+      entityType: 'collection'
+    }
+  })
+  Feed.belongsTo(Collection, { foreignKey: 'entityId', constraints: false })
+
+  Series.hasMany(Feed, {
+    foreignKey: 'entityId',
+    constraints: false,
+    scope: {
+      entityType: 'series'
+    }
+  })
+  Feed.belongsTo(Series, { foreignKey: 'entityId', constraints: false })
+
+  Playlist.hasMany(Feed, {
+    foreignKey: 'entityId',
+    constraints: false,
+    scope: {
+      entityType: 'playlist'
+    }
+  })
+  Feed.belongsTo(Playlist, { foreignKey: 'entityId', constraints: false })
+
+  Feed.addHook('afterFind', findResult => {
+    if (!Array.isArray(findResult)) findResult = [findResult]
+    for (const instance of findResult) {
+      if (instance.entityType === 'libraryItem' && instance.LibraryItem !== undefined) {
+        instance.Entity = instance.LibraryItem
+      } else if (instance.mediaItemType === 'collection' && instance.Collection !== undefined) {
+        instance.Entity = instance.Collection
+      } else if (instance.mediaItemType === 'series' && instance.Series !== undefined) {
+        instance.Entity = instance.Series
+      } else if (instance.mediaItemType === 'playlist' && instance.Playlist !== undefined) {
+        instance.Entity = instance.Playlist
+      }
+
+      // To prevent mistakes:
+      delete instance.LibraryItem
+      delete instance.dataValues.LibraryItem
+      delete instance.Collection
+      delete instance.dataValues.Collection
+      delete instance.Series
+      delete instance.dataValues.Series
+      delete instance.Playlist
+      delete instance.dataValues.Playlist
+    }
+  })
+
+  return Feed
+}
\ No newline at end of file
diff --git a/server/models/FeedEpisode.js b/server/models/FeedEpisode.js
new file mode 100644
index 00000000..ed99a539
--- /dev/null
+++ b/server/models/FeedEpisode.js
@@ -0,0 +1,37 @@
+const { DataTypes, Model } = require('sequelize')
+
+module.exports = (sequelize) => {
+  class FeedEpisode extends Model { }
+
+  FeedEpisode.init({
+    id: {
+      type: DataTypes.UUID,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true
+    },
+    title: DataTypes.STRING,
+    author: DataTypes.STRING,
+    description: DataTypes.TEXT,
+    siteURL: DataTypes.STRING,
+    enclosureURL: DataTypes.STRING,
+    enclosureType: DataTypes.STRING,
+    enclosureSize: DataTypes.BIGINT,
+    pubDate: DataTypes.STRING,
+    season: DataTypes.STRING,
+    episode: DataTypes.STRING,
+    episodeType: DataTypes.STRING,
+    duration: DataTypes.INTEGER,
+    filePath: DataTypes.STRING,
+    explicit: DataTypes.BOOLEAN
+  }, {
+    sequelize,
+    modelName: 'FeedEpisode'
+  })
+
+  const { Feed } = sequelize.models
+
+  Feed.hasMany(FeedEpisode)
+  FeedEpisode.belongsTo(Feed)
+
+  return FeedEpisode
+}
\ No newline at end of file
diff --git a/server/models/FileMetadata.js b/server/models/FileMetadata.js
index 84dc5a1b..31c84797 100644
--- a/server/models/FileMetadata.js
+++ b/server/models/FileMetadata.js
@@ -19,6 +19,7 @@ module.exports = (sequelize) => {
     birthtime: DataTypes.DATE(6)
   }, {
     sequelize,
+    freezeTableName: true, // sequelize uses datum as singular of data
     modelName: 'FileMetadata'
   })
 
diff --git a/server/models/LibrarySetting.js b/server/models/LibrarySetting.js
new file mode 100644
index 00000000..3b5243fd
--- /dev/null
+++ b/server/models/LibrarySetting.js
@@ -0,0 +1,25 @@
+const { DataTypes, Model } = require('sequelize')
+
+module.exports = (sequelize) => {
+  class LibrarySetting extends Model { }
+
+  LibrarySetting.init({
+    id: {
+      type: DataTypes.UUID,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true
+    },
+    key: DataTypes.STRING,
+    value: DataTypes.STRING
+  }, {
+    sequelize,
+    modelName: 'LibrarySetting'
+  })
+
+  const { Library } = sequelize.models
+
+  Library.hasMany(LibrarySetting)
+  LibrarySetting.belongsTo(Library)
+
+  return LibrarySetting
+}
\ No newline at end of file
diff --git a/server/models/PlaybackSession.js b/server/models/PlaybackSession.js
index 2697c050..9e13bad7 100644
--- a/server/models/PlaybackSession.js
+++ b/server/models/PlaybackSession.js
@@ -35,6 +35,12 @@ module.exports = (sequelize) => {
 
   const { Book, PodcastEpisode, User, Device } = sequelize.models
 
+  User.hasMany(PlaybackSession)
+  PlaybackSession.belongsTo(User)
+
+  Device.hasMany(PlaybackSession)
+  PlaybackSession.belongsTo(Device)
+
   Book.hasMany(PlaybackSession, {
     foreignKey: 'mediaItemId',
     constraints: false,
@@ -69,11 +75,5 @@ module.exports = (sequelize) => {
     }
   })
 
-  User.hasMany(PlaybackSession)
-  PlaybackSession.belongsTo(User)
-
-  Device.hasMany(PlaybackSession)
-  PlaybackSession.belongsTo(Device)
-
   return PlaybackSession
 }
\ No newline at end of file
diff --git a/server/models/PlaybackSessionListenTime.js b/server/models/PlaybackSessionListenTime.js
new file mode 100644
index 00000000..a3f581ad
--- /dev/null
+++ b/server/models/PlaybackSessionListenTime.js
@@ -0,0 +1,25 @@
+const { DataTypes, Model } = require('sequelize')
+
+module.exports = (sequelize) => {
+  class PlaybackSessionListenTime extends Model { }
+
+  PlaybackSessionListenTime.init({
+    id: {
+      type: DataTypes.UUID,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true
+    },
+    time: DataTypes.INTEGER,
+    date: DataTypes.STRING
+  }, {
+    sequelize,
+    modelName: 'PlaybackSessionListenTime'
+  })
+
+  const { PlaybackSession } = sequelize.models
+
+  PlaybackSession.hasMany(PlaybackSessionListenTime)
+  PlaybackSessionListenTime.belongsTo(PlaybackSession)
+
+  return PlaybackSessionListenTime
+}
\ No newline at end of file
diff --git a/server/models/PodcastEpisode.js b/server/models/PodcastEpisode.js
index 73693c8a..355fca7e 100644
--- a/server/models/PodcastEpisode.js
+++ b/server/models/PodcastEpisode.js
@@ -18,7 +18,7 @@ module.exports = (sequelize) => {
     description: DataTypes.TEXT,
     pubDate: DataTypes.STRING,
     enclosureURL: DataTypes.STRING,
-    enclosureLength: DataTypes.BIGINT,
+    enclosureSize: DataTypes.BIGINT,
     enclosureType: DataTypes.STRING,
     publishedAt: DataTypes.DATE
   }, {
diff --git a/server/models/Setting.js b/server/models/Setting.js
new file mode 100644
index 00000000..53767f58
--- /dev/null
+++ b/server/models/Setting.js
@@ -0,0 +1,19 @@
+const { DataTypes, Model } = require('sequelize')
+
+module.exports = (sequelize) => {
+  class Setting extends Model { }
+
+  Setting.init({
+    key: {
+      type: DataTypes.STRING,
+      primaryKey: true
+    },
+    value: DataTypes.STRING,
+    type: DataTypes.INTEGER
+  }, {
+    sequelize,
+    modelName: 'Setting'
+  })
+
+  return Setting
+}
\ No newline at end of file