From 507e6f10a7876ea376f61baf7ca2df5a09e4cd6d Mon Sep 17 00:00:00 2001
From: Diego Imbert <diego@windmill.dev>
Date: Wed, 18 Mar 2026 12:00:57 +0100
Subject: [PATCH] feat: tag forked datatables with nonDiffable and forkedFrom

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 .../windmill-api-workspaces/src/workspaces.rs | 23 +++++++++++++++++++
 backend/windmill-common/src/workspaces.rs     |  5 ++++
 2 files changed, 28 insertions(+)

diff --git a/backend/windmill-api-workspaces/src/workspaces.rs b/backend/windmill-api-workspaces/src/workspaces.rs
index 5a49fd1501..be04cee22b 100644
--- a/backend/windmill-api-workspaces/src/workspaces.rs
+++ b/backend/windmill-api-workspaces/src/workspaces.rs
@@ -1608,6 +1608,8 @@ async fn fork_datatable(
             resource_type: DataTableCatalogResourceType::Instance,
             resource_path: new_dbname.clone(),
         },
+        non_diffable: true,
+        forked_from: Some(original_dbname.clone()),
     };
     let datatable_value: serde_json::Value =
         serde_json::to_value(&new_datatable).map_err(|err| Error::internal_err(err.to_string()))?;
@@ -1710,6 +1712,27 @@ async fn fork_resource_datatable(
     .execute(db)
     .await?;
 
+    // Tag the datatable config as non_diffable with forked_from info
+    let forked_from_value = format!("$res:{}", resource_path);
+    let tag_json = serde_json::json!({
+        "nonDiffable": true,
+        "forkedFrom": forked_from_value
+    });
+    sqlx::query!(
+        r#"UPDATE workspace_settings
+           SET datatable = jsonb_set(
+               COALESCE(datatable, '{"datatables":{}}'::jsonb),
+               ARRAY['datatables', $1],
+               COALESCE(datatable->'datatables'->$1, '{}'::jsonb) || $2
+           )
+           WHERE workspace_id = $3"#,
+        datatable_name,
+        tag_json,
+        target_workspace_id
+    )
+    .execute(db)
+    .await?;
+
     tracing::info!(
         "Forked resource datatable '{}': created database '{}' from '{}'",
         datatable_name,
diff --git a/backend/windmill-common/src/workspaces.rs b/backend/windmill-common/src/workspaces.rs
index a1c683d28b..61952fc9ac 100644
--- a/backend/windmill-common/src/workspaces.rs
+++ b/backend/windmill-common/src/workspaces.rs
@@ -404,8 +404,13 @@ impl Default for DataTableForkBehavior {
 }
 
 #[derive(Deserialize, Serialize, Debug)]
+#[serde(rename_all = "camelCase")]
 pub struct DataTable {
     pub database: DataTableDatabase,
+    #[serde(default, skip_serializing_if = "std::ops::Not::not")]
+    pub non_diffable: bool,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub forked_from: Option<String>,
 }
 
 #[derive(Deserialize, Serialize, Debug)]