feat: add client billing fields to database and Rust backend

src-tauri/src/database.rs

@@ -12,6 +12,26 @@ pub fn init_db(conn: &Connection) -> Result<(), rusqlite::Error> {
         [],
     )?;
 
+    // Migrate clients table — add new columns (safe to re-run)
+    let migration_columns = [
+        "ALTER TABLE clients ADD COLUMN company TEXT",
+        "ALTER TABLE clients ADD COLUMN phone TEXT",
+        "ALTER TABLE clients ADD COLUMN tax_id TEXT",
+        "ALTER TABLE clients ADD COLUMN payment_terms TEXT",
+        "ALTER TABLE clients ADD COLUMN notes TEXT",
+    ];
+    for sql in &migration_columns {
+        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 projects (
             id INTEGER PRIMARY KEY AUTOINCREMENT,
@@ -98,7 +118,7 @@ pub fn init_db(conn: &Connection) -> Result<(), rusqlite::Error> {
 
     // Insert default settings
     conn.execute(
-        "INSERT OR IGNORE INTO settings (key, value) VALUES ('default_hourly_rate', '50')",
+        "INSERT OR IGNORE INTO settings (key, value) VALUES ('hourly_rate', '50')",
         [],
     )?;
     conn.execute(