Fix things in standalone mode

maubot/standalone/database.py

@@ -0,0 +1,33 @@
+# maubot - A plugin-based Matrix bot system.
+# Copyright (C) 2021 Tulir Asokan
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+from typing import Optional
+
+import sqlalchemy as sql
+
+from mautrix.util.db import Base
+from mautrix.types import UserID, SyncToken, FilterID
+
+
+class NextBatch(Base):
+    __tablename__ = "standalone_next_batch"
+
+    user_id: UserID = sql.Column(sql.String(255), primary_key=True)
+    next_batch: SyncToken = sql.Column(sql.String(255))
+    filter_id: FilterID = sql.Column(sql.String(255))
+
+    @classmethod
+    def get(cls, user_id: UserID) -> Optional['NextBatch']:
+        return cls._select_one_or_none(cls.c.user_id == user_id)