Initial commit carried over from private repo. This is V2.

code/MessengerApi.Db.Contracts/Entities/IEntity.cs

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+namespace MessengerApi.Db.Contracts.Entities
+{
+    public interface IEntity
+    {
+        Guid Id { get; }
+    }
+
+    public interface IEntity<T> : IEntity where T : class, IEntity
+    {
+    }
+}

code/MessengerApi.Db.Contracts/Entities/Message.cs

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+using MessengerApi.Db.Contracts.Entities;
+
+namespace MessengerApi.Db.Entities
+{
+    public class Message : IEntity<Message>
+    {
+        public Guid Id { get; set; }
+
+        public DateTime CreatedUtc { get; set; }
+
+        public Guid FromId { get; set; }
+
+        public Guid ToId { get; set; }
+
+        public bool IsDelivered { get; set; }
+
+        public bool IsAcknowledged { get; set; }
+
+        public string PayloadType { get; set; }
+
+        public string Payload { get; set; }
+
+        public int? PayloadLifespanInSeconds { get; set; }
+    }
+}

code/MessengerApi.Db.Contracts/Entities/User.cs

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+using MessengerApi.Db.Contracts.Entities;
+
+namespace MessengerApi.Db.Entities
+{
+    public class User : IEntity<User>
+    {
+        public Guid Id { get; set; }
+
+        public Guid ApiKey { get; set; }
+
+        public string Name { get; set; }
+
+        public bool IsEnabled { get; set; }
+    }
+}

code/MessengerApi.Db.Contracts/Entities/UserRoute.cs

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+using MessengerApi.Db.Contracts.Entities;
+
+namespace MessengerApi.Db.Entities
+{
+    /// <summary>
+    /// Describes allowed message route (who can message whom).
+    /// </summary>
+    public class UserRoute : IEntity<UserRoute>
+    {
+        public Guid Id { get; set; }
+
+        public User From { get; set; }
+
+        public User To { get; set; }
+    }
+}

code/MessengerApi.Db.Contracts/MessengerApi.Db.Contracts.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>disable</Nullable>
+  </PropertyGroup>
+
+</Project>

code/MessengerApi.Db.Contracts/Repositories/IMessageRepository.cs

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+using MessengerApi.Db.Entities;
+
+namespace MessengerApi.Db.Contracts.Repositories
+{
+    public interface IMessageRepository : IRepository<Message>
+    {
+        IEnumerable<Message> GetPendingMessages(User user);
+    }
+}

code/MessengerApi.Db.Contracts/Repositories/IRepository.cs

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+using MessengerApi.Db.Contracts.Entities;
+
+namespace MessengerApi.Db.Contracts.Repositories
+{
+    public interface IRepository
+    {
+    }
+
+    public interface IRepository<T> : IRepository where T : class, IEntity<T>
+    {
+        void Add(T entity);
+
+        T GetById(Guid id);
+    }
+}

code/MessengerApi.Db.Contracts/Repositories/IUserRepository.cs

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+using MessengerApi.Db.Entities;
+
+namespace MessengerApi.Db.Contracts.Repositories
+{
+    public interface IUserRepository : IRepository<User>
+    {
+        User SingleByApiKeyAndEnabled(Guid id, bool enabled);
+    }
+}

code/MessengerApi.Db.Contracts/Repositories/IUserRouteRepository.cs

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+using MessengerApi.Db.Entities;
+
+namespace MessengerApi.Db.Contracts.Repositories
+{
+    public interface IUserRouteRepository:IRepository<UserRoute>
+    {
+        /// <summary>
+        /// Returns all routes for given user.
+        /// </summary>
+        IEnumerable<UserRoute> GetAllByUser(User sender);
+
+        /// <summary>
+        /// Returns routes where given user is sender.
+        /// </summary>
+        IEnumerable<UserRoute> GetByFrom(User user);
+    }
+}