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;
+        }
+    }
+}