Add db migration script

tool/migrate_db.py

@@ -0,0 +1,20 @@
+from sqlalchemy import create_engine, select
+from app.db import BaseModel
+import os
+
+
+def migrate(url_from, url_to):
+    engine_from = create_engine(url_from)
+    engine_to = create_engine(url_to)
+
+    with engine_from.connect() as conn_lite:
+        with engine_to.connect() as conn_cloud:
+            for table in BaseModel.metadata.sorted_tables:
+                data = [dict(row) for row in conn_lite.execute(select(table.c))]
+                conn_cloud.execute(table.insert().values(data))
+
+
+if __name__ == "__main__":
+    url_from = os.getenv("URL_FROM")
+    url_to = os.getenv("URL_TO")
+    migrate(url_from, url_to)