diff --git a/Manager.Data/Contexts/ApplicationDbContext.cs b/Manager.Data/Contexts/ApplicationDbContext.cs
index efe4a07..2f67707 100644
--- a/Manager.Data/Contexts/ApplicationDbContext.cs
+++ b/Manager.Data/Contexts/ApplicationDbContext.cs
@@ -21,11 +21,13 @@ public sealed class ApplicationDbContext : DbContext
             sg.ToTable("settings_groups");
             sg.HasKey(x => x.Id);
         });
+        
         modelBuilder.Entity<SettingsModel>(settingsEntity =>
         {
             settingsEntity.ToTable("settings");
             settingsEntity.HasKey(x => x.Key);
         });
+        
         base.OnModelCreating(modelBuilder);
     }
 }
\ No newline at end of file
diff --git a/Manager.Data/Contexts/LibraryDbContext.cs b/Manager.Data/Contexts/LibraryDbContext.cs
index 66c363d..982536e 100644
--- a/Manager.Data/Contexts/LibraryDbContext.cs
+++ b/Manager.Data/Contexts/LibraryDbContext.cs
@@ -1,11 +1,89 @@
+using Manager.Data.Models.LibraryContext;
+using Manager.Data.Models.LibraryContext.Join;
 using Microsoft.EntityFrameworkCore;
 
 namespace Manager.Data.Contexts;
 
-public class LibraryDbContext : DbContext
+public sealed class LibraryDbContext : DbContext
 {
     public LibraryDbContext(DbContextOptions<LibraryDbContext> options) : base(options)
     {
+        ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;
+        ChangeTracker.LazyLoadingEnabled = false;
+    }
+
+    public DbSet<CaptionEntity> Captions { get; set; }
+    public DbSet<ChannelEntity> Channels { get; set; }
+    public DbSet<ClientAccountEntity> Accounts { get; set; }
+    public DbSet<HttpCookieEntity> HttpCookies { get; set; }
+    public DbSet<MediaEntity> Media { get; set; }
+    public DbSet<MediaFormatEntity> MediaFormats { get; set; }
+    public DbSet<PlaylistEntity> Playlists { get; set; }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<CaptionEntity>(ce =>
+        {
+            ce.ToTable("captions");
+            ce.HasKey(x => new { x.MediaId, x.LanguageCode });
+        });
+
+        modelBuilder.Entity<ChannelEntity>(channel =>
+        {
+            channel.ToTable("channels");
+            channel.HasKey(x => x.Id);
+        });
+
+        modelBuilder.Entity<ClientAccountEntity>(cae =>
+        {
+            cae.ToTable("client_accounts");
+            cae.HasKey(x => x.Id);
+        });
+
+        modelBuilder.Entity<HttpCookieEntity>(httpce =>
+        {
+            httpce.ToTable("http_cookies");
+        });
+
+        modelBuilder.Entity<MediaEntity>(me =>
+        {
+            me.ToTable("media");
+            me.HasKey(x => x.Id);
+            me.HasMany(x => x.Formats)
+                .WithOne()
+                .HasForeignKey(mf => mf.MediaId);
+            me.HasMany(x => x.Captions)
+                .WithOne()
+                .HasForeignKey(ce => ce.MediaId);
+        });
+
+        modelBuilder.Entity<MediaFormatEntity>(mfe =>
+        {
+            mfe.ToTable("media_formats");
+            mfe.HasKey(x => new { x.MediaId, x.Itag });
+        });
+
+        modelBuilder.Entity<PlaylistEntity>(ple =>
+        {
+            ple.ToTable("playlists");
+            ple.HasKey(x => x.Id);
+        });
         
+        /* Join tables */
+
+        modelBuilder.Entity<PlaylistMedia>(pmj =>
+        {
+            pmj.ToTable("join_playlist_media");
+            pmj.HasKey(x => new { x.PlaylistId, x.MediaId });
+            
+            pmj.HasOne<PlaylistEntity>()
+                .WithMany(pe => pe.PlaylistMedias)
+                .HasForeignKey(fk => fk.PlaylistId);
+            pmj.HasOne<MediaEntity>()
+                .WithMany(me => me.PlaylistMedias)
+                .HasForeignKey(fk => fk.MediaId);
+        });
+        
+        base.OnModelCreating(modelBuilder);
     }
 }
\ No newline at end of file
diff --git a/Manager.Data/DataConstants.cs b/Manager.Data/DataConstants.cs
new file mode 100644
index 0000000..e4ba6a9
--- /dev/null
+++ b/Manager.Data/DataConstants.cs
@@ -0,0 +1,10 @@
+namespace Manager.Data;
+
+public static class DataConstants
+{
+    public static class DbContext
+    {
+        public const int DefaultDbStringSize = 100;
+        public const int DefaultDbDescriptionStringSize = 500;
+    }
+}
\ No newline at end of file
diff --git a/Manager.Data/Models/ApplicationContext/SettingsModel.cs b/Manager.Data/Models/ApplicationContext/SettingsModel.cs
index 601cf10..4a5dfcf 100644
--- a/Manager.Data/Models/ApplicationContext/SettingsModel.cs
+++ b/Manager.Data/Models/ApplicationContext/SettingsModel.cs
@@ -1,11 +1,17 @@
+using System.ComponentModel.DataAnnotations;
+
 namespace Manager.Data.Models.ApplicationContext;
 
 public class SettingsModel
 {
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public required string Key { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public required string Name { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbDescriptionStringSize)]
     public required string Description { get; set; }
     public Guid? GroupId { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string ValueType { get; set; } = nameof(String);
     public object? Value { get; set; }
     public object? DefaultValue { get; set; }
diff --git a/Manager.Data/Models/LibraryContext/CaptionEntity.cs b/Manager.Data/Models/LibraryContext/CaptionEntity.cs
index b0e5c99..5b41bc3 100644
--- a/Manager.Data/Models/LibraryContext/CaptionEntity.cs
+++ b/Manager.Data/Models/LibraryContext/CaptionEntity.cs
@@ -1,9 +1,13 @@
+using System.ComponentModel.DataAnnotations;
+
 namespace Manager.Data.Models.LibraryContext;
 
 public class CaptionEntity
 {
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public required string MediaId { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public required string Name { get; set; }
-    public required string CaptionPath { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string? LanguageCode { get; set; }
 }
\ No newline at end of file
diff --git a/Manager.Data/Models/LibraryContext/ChannelEntity.cs b/Manager.Data/Models/LibraryContext/ChannelEntity.cs
index 29ec5d4..5a2e3b0 100644
--- a/Manager.Data/Models/LibraryContext/ChannelEntity.cs
+++ b/Manager.Data/Models/LibraryContext/ChannelEntity.cs
@@ -1,15 +1,17 @@
+using System.ComponentModel.DataAnnotations;
+
 namespace Manager.Data.Models.LibraryContext;
 
-public class ChannelEntity
+public class ChannelEntity : DateTimeBase
 {
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public required string Id { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string? Name { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbDescriptionStringSize)]
     public string? Description { get; set; }
     public DateTime JoinedDate { get; set; }
     public long Subscribers { get; set; }
     public long TotalVideos { get; set; }
     public long TotalViews { get; set; }
-    
-    public DateTime AddedDate { get; set; }
-    public DateTime ModifiedDate { get; set; }
 }
\ No newline at end of file
diff --git a/Manager.Data/Models/LibraryContext/ClientAccountEntity.cs b/Manager.Data/Models/LibraryContext/ClientAccountEntity.cs
index 5853b2c..c794eb9 100644
--- a/Manager.Data/Models/LibraryContext/ClientAccountEntity.cs
+++ b/Manager.Data/Models/LibraryContext/ClientAccountEntity.cs
@@ -1,8 +1,11 @@
+using System.ComponentModel.DataAnnotations;
+
 namespace Manager.Data.Models.LibraryContext;
 
 public class ClientAccountEntity : DateTimeBase
 {
     public Guid Id { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string Name { get; set; } = "";
     public List<PlaylistEntity> Playlists { get; set; } = [];
     public List<HttpCookieEntity> HttpCookies { get; set; } = [];
diff --git a/Manager.Data/Models/LibraryContext/HttpCookieEntity.cs b/Manager.Data/Models/LibraryContext/HttpCookieEntity.cs
index 7134ebd..41a9e10 100644
--- a/Manager.Data/Models/LibraryContext/HttpCookieEntity.cs
+++ b/Manager.Data/Models/LibraryContext/HttpCookieEntity.cs
@@ -1,15 +1,22 @@
+using System.ComponentModel.DataAnnotations;
+
 namespace Manager.Data.Models.LibraryContext;
 
 public class HttpCookieEntity : DateTimeBase
 {
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public required string Name { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string? Value { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string? Domain { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string? Path { get; set; }
     public DateTimeOffset? ExpiresUtc { get; set; }
     public bool Secure { get; set; }
     public bool HttpOnly { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string? SameSite { get; set; }
-
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public required string ClientId { get; set; }
 }
diff --git a/Manager.Data/Models/LibraryContext/Join/PlaylistMedia.cs b/Manager.Data/Models/LibraryContext/Join/PlaylistMedia.cs
new file mode 100644
index 0000000..0201196
--- /dev/null
+++ b/Manager.Data/Models/LibraryContext/Join/PlaylistMedia.cs
@@ -0,0 +1,14 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Manager.Data.Models.LibraryContext.Join;
+
+public class PlaylistMedia
+{
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
+    public required string PlaylistId { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
+    public required string MediaId { get; set; }
+
+    public DateTime DateAddedUtc { get; set; }
+    public DateTime DateModifiedUtc { get; set; }
+}
\ No newline at end of file
diff --git a/Manager.Data/Models/LibraryContext/MediaEntity.cs b/Manager.Data/Models/LibraryContext/MediaEntity.cs
index 141d426..7e9c417 100644
--- a/Manager.Data/Models/LibraryContext/MediaEntity.cs
+++ b/Manager.Data/Models/LibraryContext/MediaEntity.cs
@@ -1,21 +1,29 @@
+using System.ComponentModel.DataAnnotations;
+using Manager.Data.Models.LibraryContext.Join;
+
 namespace Manager.Data.Models.LibraryContext;
 
 public class MediaEntity : DateTimeBase
 {
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public required string Id { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string? Title { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbDescriptionStringSize)]
     public string? Description { get; set; }
     public DateTime UploadDateUtc { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public required string ChannelId { get; set; }
     public List<MediaFormatEntity> Formats { get; set; } = [];
     public List<CaptionEntity> Captions { get; set; } = [];
+    public List<PlaylistMedia> PlaylistMedias { get; set; } = [];
     
-    public MediaState State { get; set; } = MediaState.Online;
+    public MediaExternalState ExternalState { get; set; } = MediaExternalState.Online;
     public bool IsDownloaded { get; set; }
-    public MediaProcessState ProcessState { get; set; } = MediaProcessState.ToDownload;
+    public MediaState State { get; set; } = MediaState.Indexed;
 }
 
-public enum MediaState
+public enum MediaExternalState
 {
     Online,
     Offline,
@@ -23,11 +31,13 @@ public enum MediaState
     Removed
 }
 
-public enum MediaProcessState
+[Flags]
+public enum MediaState
 {
-    ToDownload,
-    Downloaded,
-    ToRemove,
-    Removed,
-    Failed
+    None = 0,
+    Indexed = 1 << 0,
+    Downloading = 1 << 1,
+    Downloaded = 1 << 2,
+    Remove = 1 << 3,
+    Failed = 1 << 4,
 }
diff --git a/Manager.Data/Models/LibraryContext/MediaFormatEntity.cs b/Manager.Data/Models/LibraryContext/MediaFormatEntity.cs
index 053713a..59a44bb 100644
--- a/Manager.Data/Models/LibraryContext/MediaFormatEntity.cs
+++ b/Manager.Data/Models/LibraryContext/MediaFormatEntity.cs
@@ -1,12 +1,16 @@
+using System.ComponentModel.DataAnnotations;
+
 namespace Manager.Data.Models.LibraryContext;
 
 public class MediaFormatEntity
 {
-    // Id = <contentid>_<itag> example: 58Gh4dE_123
-    public required string Id { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
+    public required string MediaId { get; set; }
     public required int Itag { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string? Quality { get; set; }
     public bool IsAdaptive { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string? MimeType { get; set; }
     public long Bitrate { get; set; }
     public long AverageBitrate { get; set; }
@@ -16,8 +20,10 @@ public class MediaFormatEntity
     public int? Width { get; set; }
     public int? Height { get; set; }
     public double? Framerate { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string? QualityLabel { get; set; }
     public int? AudioChannels { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public string? AudioSampleRate { get; set; }
     public double? LoudnessDb { get; set; }
 }
\ No newline at end of file
diff --git a/Manager.Data/Models/LibraryContext/PlaylistEntity.cs b/Manager.Data/Models/LibraryContext/PlaylistEntity.cs
index 622878e..94f77a8 100644
--- a/Manager.Data/Models/LibraryContext/PlaylistEntity.cs
+++ b/Manager.Data/Models/LibraryContext/PlaylistEntity.cs
@@ -1,9 +1,17 @@
+using System.ComponentModel.DataAnnotations;
+using Manager.Data.Models.LibraryContext.Join;
+
 namespace Manager.Data.Models.LibraryContext;
 
 public class PlaylistEntity : DateTimeBase
 {
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public required string Id { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public required string Name { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbDescriptionStringSize)]
     public string? Description { get; set; }
+    [MaxLength(DataConstants.DbContext.DefaultDbStringSize)]
     public required string ChannelId { get; set; }
+    public List<PlaylistMedia> PlaylistMedias { get; set; } = [];
 }
\ No newline at end of file