Initial files

Start/Server/Models/ApplicationUser.cs

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+using Microsoft.AspNetCore.Identity;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Start.Server.Models
+{
+    public class ApplicationUser : IdentityUser
+    {
+		/// <summary>The <see cref="BookmarkContainer"/>s that belong to this user</summary>
+		public List<BookmarkContainer>? BookmarkContainers { get; set; }
+	}
+}

Start/Server/Models/Bookmark.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Start.Server.Models {
+	/// <summary>A bookmark with display text and a URL to link to</summary>
+	public class Bookmark {
+		/// <summary>A unique ID for the bookmark</summary>
+		[Key]
+		public int BookmarkId { get; set; }
+
+		/// <summary>The text to display for the bookmark</summary>
+		[MaxLength(300)]
+		public string Title { get; set; }
+		/// <summary>The URL the bookmark links to</summary>
+		[MaxLength(2000)] // De facto max length of URLs
+		public string Url { get; set; }
+		/// <summary>Arbitrary notes about the bookmark</summary>
+		[MaxLength(5000)]
+		public string? Notes { get; set; }
+
+		/// <summary>The unique ID for the group the bookmark is in</summary>
+		public int BookmarkGroupId { get; set; }
+		/// <summary>The group the bookmark is in</summary>
+		public BookmarkGroup? BookmarkGroup { get; set; }
+
+		public Bookmark(string title, string url, int bookmarkGroupId) {
+			this.Title = title;
+			this.Url = url;
+			this.BookmarkGroupId = bookmarkGroupId;
+		}
+
+		public Bookmark(int bookmarkId, string title, string url, int bookmarkGroupId)
+			: this(title, url, bookmarkGroupId) {
+			this.BookmarkId = bookmarkId;
+		}
+	}
+}

Start/Server/Models/BookmarkContainer.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace Start.Server.Models {
+	/// <summary>A group of <see cref="BookmarkGroup"/>s</summary>
+	public class BookmarkContainer {
+		/// <summary>A unique ID for the container</summary>
+		[Key]
+		public int BookmarkContainerId { get; set; }
+
+		public string Title { get; set; }
+
+		/// <summary>The unique ID of the user that this container belongs to</summary>
+		public string ApplicationUserId { get; set; }
+		/// <summary>The user that this container belongs to</summary>
+		public ApplicationUser? ApplicationUser { get; set; }
+
+		/// <summary>The <see cref="BookmarkGroup"/>s in this container</summary>
+		public List<BookmarkGroup>? BookmarkGroups { get; set; }
+
+		public BookmarkContainer(string applicationUserId, string title) {
+			this.ApplicationUserId = applicationUserId;
+			this.Title = title;
+		}
+
+		public BookmarkContainer(int bookmarkContainerId, string applicationUserId, string title)
+			: this(applicationUserId, title) {
+			this.BookmarkContainerId = bookmarkContainerId;
+		}
+	}
+}

Start/Server/Models/BookmarkGroup.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace Start.Server.Models {
+	/// <summary>A group of <see cref="Bookmark"/>s</summary>
+	public class BookmarkGroup {
+		/// <summary>A unique ID for the group</summary>
+		[Key]
+		public int BookmarkGroupId { get; set; }
+
+		/// <summary>The title of the group</summary>
+		[MaxLength(300)]
+		public string Title { get; set; }
+		/// <summary>A hex color for the group</summary>
+		[MaxLength(6)]
+		public string Color { get; set; }
+
+		/// <summary>The unique ID of the container this group is in</summary>
+		public int BookmarkContainerId { get; set; }
+		/// <summary>The container this group is in</summary>
+		public BookmarkContainer? BookmarkContainer { get; set; }
+
+		/// <summary>The bookmarks in this group</summary>
+		public List<Bookmark>? Bookmarks { get; set; }
+
+		public BookmarkGroup(string title, string color) {
+			this.Title = title;
+			this.Color = color;
+		}
+
+		public BookmarkGroup(int bookmarkGroupId, string title, string color) : this(title, color) {
+			this.BookmarkGroupId = bookmarkGroupId;
+		}
+	}
+}