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; }
+    }
+}