diff --git a/mautrix_telegram/scripts/db_migrate/__main__.py b/mautrix_telegram/scripts/db_migrate/__main__.py
new file mode 100644
index 00000000..73d243aa
--- /dev/null
+++ b/mautrix_telegram/scripts/db_migrate/__main__.py
@@ -0,0 +1,59 @@
+import argparse
+import sqlalchemy as sql
+from sqlalchemy import orm
+from sqlalchemy.ext.declarative import declarative_base
+
+from alchemysession import AlchemySessionContainer
+
+parser = argparse.ArgumentParser(description="mautrix-telegram database migration script",
+                                 prog="python -m mautrix_telegram.scripts.db_migrate")
+parser.add_argument("-f", "--from-uri", type=str, required=True, metavar="<uri>",
+                    help="the old database path")
+parser.add_argument("-t", "--to-uri", type=str, required=True, metavar="<uri>",
+                    help="the new database path")
+args = parser.parse_args()
+
+
+def connect(to):
+    import mautrix_telegram.base as base
+    base.Base = declarative_base()
+    from mautrix_telegram.db import (Portal, Message, UserPortal, User, RoomState, UserProfile,
+                                     Contact, Puppet, BotChat, TelegramFile)
+    db_engine = sql.create_engine(to)
+    db_factory = orm.sessionmaker(bind=db_engine)
+    db_session = orm.scoped_session(db_factory)  # type: orm.Session
+    base.Base.metadata.bind = db_engine
+    session_container = AlchemySessionContainer(engine=db_engine, session=db_session,
+                                                table_base=base.Base, table_prefix="telethon_",
+                                                manage_tables=False)
+
+    return db_session, {
+        "Version": session_container.Version,
+        "Session": session_container.Session,
+        "Entity": session_container.Entity,
+        "SentFile": session_container.SentFile,
+        "UpdateState": session_container.UpdateState,
+        "Portal": Portal,
+        "Message": Message,
+        "Puppet": Puppet,
+        "User": User,
+        "UserPortal": UserPortal,
+        "RoomState": RoomState,
+        "UserProfile": UserProfile,
+        "Contact": Contact,
+        "BotChat": BotChat,
+        "TelegramFile": TelegramFile,
+    }
+
+
+session, tables = connect(args.from_uri)
+
+data = {}
+for name, table in tables.items():
+    data[name] = session.query(table).all()
+
+session, tables = connect(args.to_uri)
+for name, table in tables.items():
+    for row in data[name]:
+        session.merge(row)
+session.commit()