diff --git a/backend/.sqlx/query-07168aaf14cb6beff0ad4274b441f7f387f5055c47f493271d26731336257384.json b/backend/.sqlx/query-07168aaf14cb6beff0ad4274b441f7f387f5055c47f493271d26731336257384.json
index e7ed0aee65..d29a18c691 100644
--- a/backend/.sqlx/query-07168aaf14cb6beff0ad4274b441f7f387f5055c47f493271d26731336257384.json
+++ b/backend/.sqlx/query-07168aaf14cb6beff0ad4274b441f7f387f5055c47f493271d26731336257384.json
@@ -46,11 +46,11 @@
       ]
     },
     "nullable": [
-      false,
-      false,
-      false,
-      false,
-      false,
+      true,
+      true,
+      true,
+      true,
+      true,
       true,
       true
     ]
diff --git a/backend/.sqlx/query-5a219a2532517869578c4504ff3153c43903f929ae5d62fbba12610f89c36d55.json b/backend/.sqlx/query-5a219a2532517869578c4504ff3153c43903f929ae5d62fbba12610f89c36d55.json
index 36ddb8ab9f..713ccb9dd3 100644
--- a/backend/.sqlx/query-5a219a2532517869578c4504ff3153c43903f929ae5d62fbba12610f89c36d55.json
+++ b/backend/.sqlx/query-5a219a2532517869578c4504ff3153c43903f929ae5d62fbba12610f89c36d55.json
@@ -15,7 +15,7 @@
       ]
     },
     "nullable": [
-      true
+      null
     ]
   },
   "hash": "5a219a2532517869578c4504ff3153c43903f929ae5d62fbba12610f89c36d55"
diff --git a/backend/.sqlx/query-aef927110ef4cff51d3faabb0c389730dd215f4e90d105f0e86025f0ac42f020.json b/backend/.sqlx/query-aef927110ef4cff51d3faabb0c389730dd215f4e90d105f0e86025f0ac42f020.json
new file mode 100644
index 0000000000..2a90d12ad0
--- /dev/null
+++ b/backend/.sqlx/query-aef927110ef4cff51d3faabb0c389730dd215f4e90d105f0e86025f0ac42f020.json
@@ -0,0 +1,15 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "INSERT INTO datatable_migrations (workspace_id, datatable, timestamp, name, code_up, code_down)\n         SELECT $2, datatable, timestamp, name, code_up, code_down\n         FROM datatable_migrations WHERE workspace_id = $1",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Left": [
+        "Text",
+        "Varchar"
+      ]
+    },
+    "nullable": []
+  },
+  "hash": "aef927110ef4cff51d3faabb0c389730dd215f4e90d105f0e86025f0ac42f020"
+}
diff --git a/backend/windmill-api-workspaces/src/datatable_migrations.rs b/backend/windmill-api-workspaces/src/datatable_migrations.rs
index c89e5720ca..e2d1cf3243 100644
--- a/backend/windmill-api-workspaces/src/datatable_migrations.rs
+++ b/backend/windmill-api-workspaces/src/datatable_migrations.rs
@@ -1345,6 +1345,25 @@ pub(crate) async fn cascade_datatable_migration_renames_and_deletes(
     Ok(())
 }
 
+/// Copy a workspace's migration definitions to another workspace, so a fork
+/// inherits the same per-data-table migration history as its parent.
+pub(crate) async fn clone_datatable_migrations(
+    tx: &mut Transaction<'_, Postgres>,
+    source_workspace_id: &str,
+    target_workspace_id: &str,
+) -> Result<()> {
+    sqlx::query!(
+        "INSERT INTO datatable_migrations (workspace_id, datatable, timestamp, name, code_up, code_down)
+         SELECT $2, datatable, timestamp, name, code_up, code_down
+         FROM datatable_migrations WHERE workspace_id = $1",
+        source_workspace_id,
+        target_workspace_id,
+    )
+    .execute(&mut **tx)
+    .await?;
+    Ok(())
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -1492,4 +1511,38 @@ mod tests {
             ]
         );
     }
+
+    // A fork inherits its parent's migration definitions unchanged.
+    #[sqlx::test(migrations = "../migrations")]
+    async fn clone_copies_datatable_migrations_to_target(pool: DB) {
+        let src = format!("src{}", uuid::Uuid::new_v4().simple());
+        let dst = format!("dst{}", uuid::Uuid::new_v4().simple());
+        for w in [&src, &dst] {
+            sqlx::query(
+                "INSERT INTO workspace (id, name, owner) VALUES ($1, $1, 'test@windmill.dev')",
+            )
+            .bind(w)
+            .execute(&pool)
+            .await
+            .unwrap();
+        }
+        seed_migration(&pool, &src, "customers", 1, "create_customers").await;
+        seed_migration(&pool, &src, "customers", 2, "add_index").await;
+        seed_migration(&pool, &src, "orders", 3, "create_orders").await;
+
+        let mut tx = pool.begin().await.unwrap();
+        clone_datatable_migrations(&mut tx, &src, &dst)
+            .await
+            .unwrap();
+        tx.commit().await.unwrap();
+
+        // the target ends up with an identical set, and the source is untouched.
+        let expected = vec![
+            ("customers".to_string(), "create_customers".to_string()),
+            ("customers".to_string(), "add_index".to_string()),
+            ("orders".to_string(), "create_orders".to_string()),
+        ];
+        assert_eq!(migration_keys(&pool, &dst).await, expected);
+        assert_eq!(migration_keys(&pool, &src).await, expected);
+    }
 }
diff --git a/backend/windmill-api-workspaces/src/workspaces.rs b/backend/windmill-api-workspaces/src/workspaces.rs
index db5a56cec0..8544513d01 100644
--- a/backend/windmill-api-workspaces/src/workspaces.rs
+++ b/backend/windmill-api-workspaces/src/workspaces.rs
@@ -3974,6 +3974,15 @@ async fn clone_workspace_data(
     // Clone workspace settings (merge with existing basic settings)
     update_workspace_settings(tx, source_workspace_id, target_workspace_id).await?;
 
+    // Clone data table migration definitions (the settings above carry the data
+    // table config; this carries their migration history).
+    crate::datatable_migrations::clone_datatable_migrations(
+        tx,
+        source_workspace_id,
+        target_workspace_id,
+    )
+    .await?;
+
     // Clone workspace environment variables
     clone_workspace_env(tx, source_workspace_id, target_workspace_id).await?;