Database authentication models.

src/Spoleto.BookApi.Interfaces/Models/Auth/BearerToken.cs

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+namespace Spoleto.BookApi.Interfaces.Models.Auth
+{
+    /// <summary>
+    /// The Bearer token.
+    /// </summary>
+    public class BearerToken
+    {
+        /// <summary>
+        /// Gets or sets the access token.
+        /// </summary>
+        public string AccessToken { get; set; }
+
+        /// <summary>
+        /// Gets or sets the refresh token.
+        /// </summary>
+        public string RefreshToken { get; set; }
+    }
+}

src/Spoleto.BookApi.Interfaces/Models/Auth/RefreshToken.cs

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+using System;
+
+namespace Spoleto.BookApi.Interfaces.Models.Auth
+{
+    /// <summary>
+    /// The refresh token.
+    /// </summary>
+    public class RefreshToken : PersistentObjectBase
+    {
+        /// <summary>
+        /// Gets or sets the hash value for this refresh token.
+        /// </summary>
+        public string ValueToken { get; set; }
+
+        /// <summary>
+        /// Gets or sets the active flag of this token.
+        /// </summary>
+        public bool Active { get; set; }
+
+        /// <summary>
+        /// Gets or sets the date issued in UTC of this token.
+        /// </summary>
+        public DateTime DateIssued { get; set; }
+
+        /// <summary>
+        /// Gets or sets the date expires in UTC of this token.
+        /// </summary>
+        public DateTime DateExpires { get; set; }
+
+        /// <summary>
+        /// Gets or sets the target user identifier for this refresh token.
+        /// </summary>
+        public Guid UserId { get; set; }
+
+        /// <summary>
+        /// Gets or sets the target user for this refresh token.
+        /// </summary>
+        public User User { get; set; }
+    }
+}

src/Spoleto.BookApi.Interfaces/Models/Auth/User.cs

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+namespace Spoleto.BookApi.Interfaces.Models.Auth
+{
+    /// <summary>
+    /// The user for database authentication.
+    /// </summary>
+    public class User : PersistentObjectBase
+    {
+        /// <summary>
+        /// Gets or sets the user's first name.
+        /// </summary>
+        public string FirstName { get; set; }
+
+        /// <summary>
+        /// Gets or sets the user's middle name. Optional, can be null if not provided.
+        /// </summary>
+        public string MiddleName { get; set; }
+
+        /// <summary>
+        /// Gets or sets the user's last name. Optional, can be null if not provided.
+        /// </summary>
+        public string LastName { get; set; }
+
+        /// <summary>
+        /// Gets or sets the user's phone number.
+        /// </summary>
+        /// <remarks>
+        /// It is required if <see cref="Email"/> is not initialized.<br/>
+        /// In this case <see cref="Phone"/> is expected to be unique.
+        /// </remarks>
+        public string Phone { get; set; }
+
+        /// <summary>
+        /// Gets or sets the user's email address.
+        /// </summary>
+        /// <remarks>
+        /// It is required if <see cref="Phone"/> is not initialized.<br/>
+        /// In this case <see cref="Email"/> is expected to be unique.
+        /// </remarks>
+        public string Email { get; set; }
+
+        /// <summary>
+        /// Gets or sets the user's password (hash).
+        /// </summary>
+        public string Password { get; set; }
+    }
+}