add architecture skeleton

GymLogAI.Core/Entities/Exercise.cs

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+namespace GymLogAI.Core.Entities;
+
+public class Exercise
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    public float[]? Embedding { get; set; }
+    public DateTime CreatedAtUtc { get; set; }
+
+    public List<WorkoutExercise> WorkoutExercises { get; set; } = [];
+}

GymLogAI.Core/Entities/ExerciseSet.cs

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+namespace GymLogAI.Core.Entities;
+
+public class ExerciseSet
+{
+    public Guid Id { get; set; }
+    public Guid WorkoutExerciseId { get; set; }
+    public int Order { get; set; }
+    public decimal? WeightKg { get; set; }
+    public int? Repetitions { get; set; }
+    public int? DurationSeconds { get; set; }
+    public decimal? DistanceMeters { get; set; }
+    public string? Notes { get; set; }
+
+    public WorkoutExercise? WorkoutExercise { get; set; }
+}

GymLogAI.Core/Entities/TelegramMessage.cs

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+using GymLogAI.Core.Enums;
+
+namespace GymLogAI.Core.Entities;
+
+public class TelegramMessage
+{
+    public Guid Id { get; set; }
+    public Guid UserId { get; set; }
+    public long TelegramChatId { get; set; }
+    public int TelegramMessageId { get; set; }
+    public string Text { get; set; } = string.Empty;
+    public DateTime SentAtUtc { get; set; }
+    public DateTime ImportedAtUtc { get; set; }
+    public ParsingStatus ParsingStatus { get; set; }
+    public string? ParsingError { get; set; }
+    public Guid? WorkoutId { get; set; }
+    public DateTime? ParsedAtUtc { get; set; }
+
+    public User? User { get; set; }
+    public Workout? Workout { get; set; }
+}

GymLogAI.Core/Entities/User.cs

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+namespace GymLogAI.Core.Entities;
+
+public class User
+{
+    public Guid Id { get; set; }
+    public long TelegramUserId { get; set; }
+    public string? Username { get; set; }
+    public string? FirstName { get; set; }
+    public string? LastName { get; set; }
+    public DateTime CreatedAtUtc { get; set; }
+
+    public List<TelegramMessage> TelegramMessages { get; set; } = [];
+    public List<Workout> Workouts { get; set; } = [];
+}

GymLogAI.Core/Entities/Workout.cs

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+using GymLogAI.Core.Enums;
+
+namespace GymLogAI.Core.Entities;
+
+public class Workout
+{
+    public Guid Id { get; set; }
+    public Guid UserId { get; set; }
+    public Guid? SourceTelegramMessageId { get; set; }
+    public DateTime PerformedAtUtc { get; set; }
+    public string? Title { get; set; }
+    public string? Notes { get; set; }
+    public WorkoutSourceType SourceType { get; set; }
+    public DateTime CreatedAtUtc { get; set; }
+
+    public User? User { get; set; }
+    public TelegramMessage? SourceTelegramMessage { get; set; }
+    public List<WorkoutExercise> WorkoutExercises { get; set; } = [];
+}

GymLogAI.Core/Entities/WorkoutExercise.cs

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+namespace GymLogAI.Core.Entities;
+
+public class WorkoutExercise
+{
+    public Guid Id { get; set; }
+    public Guid WorkoutId { get; set; }
+    public Guid ExerciseId { get; set; }
+    public int Order { get; set; }
+    public string? Notes { get; set; }
+
+    public Workout? Workout { get; set; }
+    public Exercise? Exercise { get; set; }
+    public List<ExerciseSet> Sets { get; set; } = [];
+}