fixed backend port for shifts

backend/src/database/migrations/002_add_employee_fields.sql

@@ -1,3 +1,4 @@
 -- Add employee fields
 ALTER TABLE users ADD COLUMN employee_type TEXT CHECK(employee_type IN ('chef', 'neuling', 'erfahren'));
-ALTER TABLE users ADD COLUMN is_sufficiently_independent BOOLEAN DEFAULT FALSE;
+ALTER TABLE users ADD COLUMN is_sufficiently_independent BOOLEAN DEFAULT FALSE;
+ALTER TABLE users ADD COLUMN last_login TEXT DEFAULT NULL;

backend/src/database/schema.sql

@@ -9,7 +9,7 @@ CREATE TABLE IF NOT EXISTS users (
   is_sufficiently_independent BOOLEAN DEFAULT FALSE,
   is_active BOOLEAN DEFAULT TRUE,
   created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-  last_login DATETIME
+  last_login TEXT || NULL
 );
 
 -- Tabelle für Schichtvorlagen