Added ASP.NET backend with SQLite

backend/MuiCharts.Domain/Repositories/IPointRepository.cs

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+using ErrorOr;
+using MuiCharts.Domain.Models;
+
+namespace MuiCharts.Domain.Repositories;
+
+/// <summary>
+/// Represents a repository for managing points.
+/// </summary>
+public interface IPointRepository
+{
+	/// <summary>
+	/// Adds a new point asynchronously.
+	/// </summary>
+	/// <param name="point">The point to add.</param>
+	/// <returns>A task that represents the asynchronous operation. The task result contains the added point or an error.</returns>
+	Task<ErrorOr<Point>> AddPointAsync(Point point);
+
+	/// <summary>
+	/// Retrieves a point by its ID asynchronously.
+	/// </summary>
+	/// <param name="id">The ID of the point to retrieve.</param>
+	/// <returns>A task that represents the asynchronous operation. The task result contains the retrieved point or an error.</returns>
+	Task<ErrorOr<Point>> GetPointAsync(int id);
+
+	/// <summary>
+	/// Retrieves a range of points asynchronously.
+	/// </summary>
+	/// <returns>A task that represents the asynchronous operation. The task result contains a queryable collection of points.</returns>
+	Task<IQueryable<Point>> GetPointsRangeAsync();
+
+	/// <summary>
+	/// Adds or updates a point asynchronously.
+	/// </summary>
+	/// <param name="point">The point to add or update.</param>
+	/// <returns>A task that represents the asynchronous operation. The task result contains the added or updated point or an error.</returns>
+	Task<ErrorOr<Point?>> AddOrUpdatePointAsync(Point point);
+
+	/// <summary>
+	/// Deletes a point by its ID asynchronously.
+	/// </summary>
+	/// <param name="id">The ID of the point to delete.</param>
+	/// <returns>A task that represents the asynchronous operation. The task result contains a flag indicating if the point was deleted successfully or an error.</returns>
+	Task<ErrorOr<Deleted>> DeletePointAsync(int id);
+}

backend/MuiCharts.Domain/Repositories/ITrackRepository.cs

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+using ErrorOr;
+using MuiCharts.Domain.Models;
+
+namespace MuiCharts.Domain.Repositories;
+
+/// <summary>
+/// Represents a repository for managing tracks.
+/// </summary>
+public interface ITrackRepository
+{
+	/// <summary>
+	/// Adds a new track asynchronously.
+	/// </summary>
+	/// <param name="track">The track to add.</param>
+	/// <returns>A task that represents the asynchronous operation. The task result contains the added track if successful, or an error if unsuccessful.</returns>
+	Task<ErrorOr<Track>> AddTrackAsync(Track track);
+
+	/// <summary>
+	/// Retrieves a track asynchronously based on the specified IDs.
+	/// </summary>
+	/// <param name="firstId">The first ID.</param>
+	/// <param name="secondId">The second ID.</param>
+	/// <returns>A task that represents the asynchronous operation. The task result contains the retrieved track if successful, or an error if unsuccessful.</returns>
+	Task<ErrorOr<Track>> GetTrackAsync(int firstId, int secondId);
+
+	/// <summary>
+	/// Retrieves a range of tracks asynchronously.
+	/// </summary>
+	/// <returns>A task that represents the asynchronous operation. The task result contains the range of tracks.</returns>
+	Task<IQueryable<Track>> GetTracksRangeAsync();
+
+	/// <summary>
+	/// Adds or updates a track asynchronously.
+	/// </summary>
+	/// <param name="track">The track to add or update.</param>
+	/// <returns>A task that represents the asynchronous operation. The task result contains the added or updated track if successful, or an error if unsuccessful.</returns>
+	Task<ErrorOr<Track?>> AddOrUpdateTrackAsync(Track track);
+
+	/// <summary>
+	/// Deletes a track asynchronously based on the specified IDs.
+	/// </summary>
+	/// <param name="firstId">The first ID.</param>
+	/// <param name="secondId">The second ID.</param>
+	/// <returns>A task that represents the asynchronous operation. The task result contains the deletion status if successful, or an error if unsuccessful.</returns>
+	Task<ErrorOr<Deleted>> DeleteTrackAsync(int firstId, int secondId);
+}