feat: add published at db models and fix repo for this update

backend/internal/storage/migrations.go

@@ -4,6 +4,7 @@ const Migrations = `
 CREATE TABLE IF NOT EXISTS posts(
 	id INTEGER PRIMARY KEY AUTOINCREMENT,	
 	title TEXT NOT NULL,
+	published BOOLEAN DEFAULT 0,
 	content TEXT NOT NULL,
 	CREATED_AT DATETIME DEFAULT CURRENT_TIMESTAMP
 );