Added a way to read what the AI received from your sources (#1100)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/Databases/ProvenanceStore/ProvenanceEntity.cs

@@ -0,0 +1,30 @@
+namespace AIStudio.Tools.Databases.ProvenanceStore;
+
+/// <summary>
+/// One row of the table provenance.
+/// </summary>
+/// <remarks>
+/// The key is the chat together with the id. A chat which is copied, e.g., an assistant's
+/// conversation which the user carries over into a chat, takes its rows along under the same ids,
+/// so its references stay valid, and deleting one of the two chats leaves the other one whole.
+/// </remarks>
+internal sealed class ProvenanceEntity
+{
+    public string ChatId { get; set; } = string.Empty;
+
+    public string Id { get; set; } = string.Empty;
+
+    /// <summary>
+    /// The ProvenanceKind, stored by name.
+    /// </summary>
+    public string Kind { get; set; } = string.Empty;
+
+    public string Content { get; set; } = string.Empty;
+
+    /// <summary>
+    /// The content around an ERI passage as a JSON array of strings, or null when there is none.
+    /// </summary>
+    public string? SurroundingContent { get; set; }
+
+    public DateTimeOffset CreatedAtUtc { get; set; }
+}