inputing data for the client for the validation

server/src/table_definition/handlers/post_table_definition.rs

@@ -351,6 +351,29 @@ async fn execute_table_definition(
         Status::internal(format!("Database error: {}", e))
     })?;
 
+    for col_def in &columns {
+        // Column string looks like "\"name\" TYPE", split out identifier
+        let col_name = col_def.split_whitespace().next().unwrap_or("");
+        let clean_col = col_name.trim_matches('"');
+
+        // Default empty config — currently only character_limits block, none set.
+        let default_cfg = serde_json::json!({ 
+            "character_limits": { "min": 0, "max": 0, "warn_at": null, "count_mode": "CHARS" }
+        });
+
+        sqlx::query!(
+            r#"INSERT INTO table_validation_rules (table_def_id, data_key, config)
+           VALUES ($1, $2, $3)
+           ON CONFLICT (table_def_id, data_key) DO NOTHING"#,
+           table_def.id,
+           clean_col,
+           default_cfg
+        )
+        .execute(&mut **tx)
+        .await
+        .map_err(|e| Status::internal(format!("Failed to insert default validation rule for column {}: {}", clean_col, e)))?;
+    }
+
     for (linked_id, is_required) in links {
         sqlx::query!(
             "INSERT INTO table_definition_links