Add project files.

Core.Blueprint.SQLServer/Contracts/IBaseSQLAdapter.cs

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+using Core.Blueprint.SQLServer.Entities;
+using System.ComponentModel.DataAnnotations;
+using System.Text.Json.Serialization;
+
+namespace Core.Blueprint.SQLServer
+{
+    /// <summary>
+    /// Defines the interface for SQL Server entities, providing common properties for auditing and state management.
+    /// </summary>
+    public interface IBaseSQLAdapter
+    {
+
+        /// <summary>
+        /// Gets or sets the identifier for the entity.
+        /// </summary>
+        [Key]
+        [JsonPropertyName("id")]
+        int Id { get; }
+
+        /// <summary>
+        /// Gets or sets the GUID for the entity.
+        /// </summary>
+        [JsonPropertyName("guid")]
+        string Guid { get; }
+
+        /// <summary>
+        /// Gets or sets the timestamp when the entity was created.
+        /// </summary>
+        [JsonPropertyName("createdAt")]
+        DateTime? CreatedAt { get; }
+
+        /// <summary>
+        /// Gets or sets the identifier of the user or system that created the entity.
+        /// </summary>
+        [JsonPropertyName("createdBy")]
+        string? CreatedBy { get; set; }
+
+        /// <summary>
+        /// Gets or sets the timestamp when the entity was last updated.
+        /// </summary>
+        [JsonPropertyName("updatedAt")]
+        DateTime? UpdatedAt { get; set; }
+
+        /// <summary>
+        /// Gets or sets the identifier of the user or system that last updated the entity.
+        /// </summary>
+        [JsonPropertyName("updatedBy")]
+        string? UpdatedBy { get; set; }
+
+        /// <summary>
+        /// Gets or sets the status of the entity, indicating whether it is active, inactive, or in another state.
+        /// </summary>
+        [JsonPropertyName("status")]
+        [JsonConverter(typeof(JsonStringEnumConverter))]
+        StatusEnum Status { get; set; }
+    }
+}

Core.Blueprint.SQLServer/Contracts/IEntityRepository.cs

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+using Microsoft.EntityFrameworkCore;
+using System.Linq.Expressions;
+
+namespace Core.Blueprint.DAL.SQLServer
+{
+    /// <summary>
+    /// Defines the contract for a generic repository to manage entities in a SQL Server database.
+    /// </summary>
+    /// <typeparam name="TEntity">The type of the entity managed by the repository. Must be a class.</typeparam>
+    /// <typeparam name="TContext">The type of the database context used by the repository. Must inherit from <see cref="DbContext"/>.</typeparam>
+    public interface IEntityRepository<TEntity, TContext>
+        where TEntity : class
+        where TContext : DbContext
+    {
+        /// <summary>
+        /// Retrieves all entities of type <typeparamref name="T"/> from the database.
+        /// </summary>
+        /// <returns>A task representing the asynchronous operation, with a collection of entities as the result.</returns>
+        Task<IEnumerable<TEntity>> GetAllAsync();
+
+        /// <summary>
+        /// Retrieves all entities of type <typeparamref name="T"/> from the database that match a specified condition.
+        /// </summary>
+        /// <param name="predicate">An expression to filter the entities.</param>
+        /// <returns>A task representing the asynchronous operation, with a collection of matching entities as the result.</returns>
+        Task<IEnumerable<TEntity>> GetByConditionAsync(Expression<Func<TEntity, bool>> predicate);
+
+        /// <summary>
+        /// Retrieves a single entity of type <typeparamref name="T"/> by its identifier.
+        /// </summary>
+        /// <param name="id">The identifier of the entity to retrieve.</param>
+        /// <returns>A task representing the asynchronous operation, with the entity as the result, or null if not found.</returns>
+        Task<TEntity?> GetByIdAsync(int id);
+
+        /// <summary>
+        /// Retrieves the first entity of type <typeparamref name="T"/> that matches a specified condition, or null if no match is found.
+        /// </summary>
+        /// <param name="predicate">An expression to filter the entities.</param>
+        /// <returns>A task representing the asynchronous operation, with the matching entity as the result, or null if none match.</returns>
+        Task<TEntity?> FirstOrDefaultAsync(Expression<Func<TEntity, bool>> predicate);
+
+        /// <summary>
+        /// Adds a new entity of type <typeparamref name="T"/> to the database.
+        /// </summary>
+        /// <param name="entity">The entity to add.</param>
+        /// <returns>A task representing the asynchronous operation.</returns>
+        Task AddAsync(TEntity entity);
+
+        /// <summary>
+        /// Adds multiple entities of type <typeparamref name="T"/> to the database.
+        /// </summary>
+        /// <param name="entities">The collection of entities to add.</param>
+        /// <returns>A task representing the asynchronous operation.</returns>
+        Task AddRangeAsync(IEnumerable<TEntity> entities);
+
+        /// <summary>
+        /// Updates an existing entity of type <typeparamref name="T"/> in the database.
+        /// </summary>
+        /// <param name="entity">The entity to update.</param>
+        /// <returns>The updated entity.</returns>
+        TEntity Update(TEntity entity);
+
+        /// <summary>
+        /// Updates multiple entities of type <typeparamref name="T"/> in the database.
+        /// </summary>
+        /// <param name="entities">The collection of entities to update.</param>
+        void UpdateRange(IEnumerable<TEntity> entities);
+
+        /// <summary>
+        /// Deletes an entity of type <typeparamref name="T"/> from the database.
+        /// </summary>
+        /// <param name="entity">The entity to delete.</param>
+        void Delete(TEntity entity);
+
+        /// <summary>
+        /// Deletes multiple entities of type <typeparamref name="T"/> from the database.
+        /// </summary>
+        /// <param name="entities">The collection of entities to delete.</param>
+        void DeleteRange(IEnumerable<TEntity> entities);
+
+        /// <summary>
+        /// Determines whether any entities of type <typeparamref name="T"/> exist in the database that match a specified condition.
+        /// </summary>
+        /// <param name="predicate">An expression to filter the entities.</param>
+        /// <returns>A task representing the asynchronous operation, with a boolean result indicating whether any match exists.</returns>
+        Task<bool> AnyAsync(Expression<Func<TEntity, bool>> predicate);
+
+        /// <summary>
+        /// Executes a raw SQL query and maps the result to entities of type <typeparamref name="T"/>.
+        /// </summary>
+        /// <param name="sql">The raw SQL query to execute.</param>
+        /// <param name="parameters">Optional parameters for the SQL query.</param>
+        /// <returns>A task representing the asynchronous operation, with a collection of entities as the result.</returns>
+        Task<IEnumerable<TEntity>> ExecuteRawSqlAsync(string sql, params object[] parameters);
+
+        /// <summary>
+        /// Counts the total number of entities of type <typeparamref name="T"/> in the database.
+        /// </summary>
+        /// <returns>A task representing the asynchronous operation, with the count as the result.</returns>
+        Task<int> CountAsync();
+
+        /// <summary>
+        /// Saves all pending changes to the database.
+        /// </summary>
+        /// <returns>A task representing the asynchronous operation.</returns>
+        Task SaveAsync();
+    }
+}