major db refactors

migrations/20240827001_initial_schema.sql

@@ -9,7 +9,8 @@ CREATE TABLE users (
     id INTEGER PRIMARY KEY,
     telegram_id INTEGER UNIQUE NOT NULL,
     username TEXT,
-    display_name TEXT,
+    first_name TEXT,
+    last_name TEXT,
     is_banned INTEGER DEFAULT 0,
     created_at TEXT DEFAULT CURRENT_TIMESTAMP,
     updated_at TEXT DEFAULT CURRENT_TIMESTAMP