Add project files.

Core.Blueprint.SQLServer/Adapters/BaseSQLAdapter.cs

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+using System.ComponentModel.DataAnnotations;
+using System.Text.Json.Serialization;
+
+namespace Core.Blueprint.SQLServer.Entities
+{
+    /// <summary>
+    /// Represents the base class for SQL Server entities, providing common properties for auditing and state management.
+    /// </summary>
+    public abstract class BaseSQLAdapter : IBaseSQLAdapter
+    {
+        /// <summary>
+        /// Gets or sets the identifier for the entity.
+        /// </summary>
+        [Key]
+        [JsonPropertyName("id")]
+        public int Id { get; init; }
+
+        /// <summary>
+        /// Gets or sets the unique identifier for the entity.
+        /// </summary>
+        [JsonPropertyName("guid")]
+        public string Guid { get; init; }
+
+        /// <summary>
+        /// Gets or sets the timestamp when the entity was created.
+        /// Default value is the current UTC time at the moment of instantiation.
+        /// </summary>
+        [JsonPropertyName("createdAt")]
+        public DateTime? CreatedAt { get; init; }
+
+        /// <summary>
+        /// Gets or sets the identifier of the user or system that created the entity.
+        /// </summary>
+        [JsonPropertyName("createdBy")]
+        public string? CreatedBy { get; set; }
+
+        /// <summary>
+        /// Gets or sets the timestamp when the entity was last updated.
+        /// Null if the entity has not been updated.
+        /// </summary>
+        [JsonPropertyName("updatedAt")]
+        public DateTime? UpdatedAt { get; set; }
+
+        /// <summary>
+        /// Gets or sets the identifier of the user or system that last updated the entity.
+        /// Null if the entity has not been updated.
+        /// </summary>
+        [JsonPropertyName("updatedBy")]
+        public string? UpdatedBy { get; set; }
+
+        /// <summary>
+        /// Gets or sets the status of the entity, indicating whether it is active, inactive, or in another state.
+        /// Default value is <see cref="StatusEnum.Active"/>.
+        /// </summary>
+        [JsonPropertyName("status")]
+        [JsonConverter(typeof(JsonStringEnumConverter))]
+        public StatusEnum Status { get; set; }
+
+        protected BaseSQLAdapter()
+        {
+            Guid = System.Guid.NewGuid().ToString();
+            CreatedAt = DateTime.UtcNow;
+        }
+    }
+}

Core.Blueprint.SQLServer/Adapters/StatusEnum.cs

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+using System.Text.Json.Serialization;
+
+namespace Core.Blueprint.SQLServer.Entities
+{
+    /// <summary>
+    /// Defines the possible statuses for entities in the system.
+    /// Used to track the state of an entity, such as whether it is active, inactive, or deleted.
+    /// </summary>
+    [JsonConverter(typeof(JsonStringEnumConverter))]
+    public enum StatusEnum
+    {
+        /// <summary>
+        /// Indicates that the entity is currently active and operational.
+        /// </summary>
+        Active = 0,
+
+        /// <summary>
+        /// Indicates that the entity is currently inactive but still exists in the system.
+        /// Typically used for temporary deactivation or soft-offline states.
+        /// </summary>
+        Inactive = 1,
+
+        /// <summary>
+        /// Indicates that the entity has been deleted and is no longer accessible.
+        /// Often used in soft-delete scenarios where the entity is retained for archival or audit purposes.
+        /// </summary>
+        Deleted = 2
+    }
+}