From d069e545fcf983f665c0879276426563b84c5933 Mon Sep 17 00:00:00 2001
From: Aaron Burtle <aaronburtle@microsoft.com>
Date: Wed, 6 May 2026 17:25:05 -0700
Subject: [PATCH 1/2] Make JsonConstructor DataSource parameter nullable to
 match property annotation

---
 src/Config/ObjectModel/RuntimeConfig.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Config/ObjectModel/RuntimeConfig.cs b/src/Config/ObjectModel/RuntimeConfig.cs
index 0162052965..1ef5c073e6 100644
--- a/src/Config/ObjectModel/RuntimeConfig.cs
+++ b/src/Config/ObjectModel/RuntimeConfig.cs
@@ -317,7 +317,7 @@ public bool RemoveGeneratedAutoentityNameFromDataSourceName(string entityName)
     [JsonConstructor]
     public RuntimeConfig(
         string? Schema,
-        DataSource DataSource,
+        DataSource? DataSource,
         RuntimeEntities Entities,
         RuntimeAutoentities? Autoentities = null,
         RuntimeOptions? Runtime = null,

From 351ac97614c2c6b993ba05f081fa9fa339b15c0f Mon Sep 17 00:00:00 2001
From: Aaron Burtle <aaronburtle@microsoft.com>
Date: Wed, 6 May 2026 17:39:48 -0700
Subject: [PATCH 2/2] Update DataSource parameter doc to reflect nullable
 annotation

---
 src/Config/ObjectModel/RuntimeConfig.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Config/ObjectModel/RuntimeConfig.cs b/src/Config/ObjectModel/RuntimeConfig.cs
index 1ef5c073e6..21d2c23252 100644
--- a/src/Config/ObjectModel/RuntimeConfig.cs
+++ b/src/Config/ObjectModel/RuntimeConfig.cs
@@ -310,7 +310,7 @@ public bool RemoveGeneratedAutoentityNameFromDataSourceName(string entityName)
     /// To be used when setting up from cli json scenario.
     /// </summary>
     /// <param name="Schema">schema for config.</param>
-    /// <param name="DataSource">Default datasource.</param>
+    /// <param name="DataSource">Default datasource. May be null for root configs that use <paramref name="DataSourceFiles"/> and delegate the data source to child configs.</param>
     /// <param name="Entities">Entities</param>
     /// <param name="Runtime">Runtime settings.</param>
     /// <param name="DataSourceFiles">List of datasource files for multiple db scenario. Null for single db scenario.</param>