refactor(backend): refactor project, add database migrations support

create_migration.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [ -z "$1" ]; then
+  echo "Usage: $0 <migration_message>"
+  exit 1
+fi
+
+cd backend || { echo "Directory 'backend' does not exist"; exit 1; }
+alembic revision --autogenerate -m "$1"
+git add alembic/versions/*
+cd - || exit