feat: add template_id column to invoices table and update_invoice_template command

src-tauri/src/database.rs

@@ -111,6 +111,22 @@ pub fn init_db(conn: &Connection) -> Result<(), rusqlite::Error> {
         [],
     )?;
 
+    // Migrate invoices table — add template_id column (safe to re-run)
+    let invoice_migrations = [
+        "ALTER TABLE invoices ADD COLUMN template_id TEXT DEFAULT 'clean'",
+    ];
+    for sql in &invoice_migrations {
+        match conn.execute(sql, []) {
+            Ok(_) => {}
+            Err(e) => {
+                let msg = e.to_string();
+                if !msg.contains("duplicate column") {
+                    return Err(e);
+                }
+            }
+        }
+    }
+
     conn.execute(
         "CREATE TABLE IF NOT EXISTS invoice_items (
             id INTEGER PRIMARY KEY AUTOINCREMENT,