feat(db): v4 to v5 migration

src/arcaea_offline/database/migrations/legacies/v5.py

@@ -0,0 +1,28 @@
+from datetime import datetime, timezone
+from typing import Optional
+
+from sqlalchemy import DateTime
+from sqlalchemy.types import TypeDecorator
+
+
+class ForceTimezoneDateTime(TypeDecorator):
+    """
+    Store timezone aware timestamps as timezone naive UTC
+
+    https://docs.sqlalchemy.org/en/20/core/custom_types.html#store-timezone-aware-timestamps-as-timezone-naive-utc
+    """
+
+    impl = DateTime
+    cache_ok = True
+
+    def process_bind_param(self, value: Optional[datetime], dialect):
+        if value is not None:
+            if not value.tzinfo or value.tzinfo.utcoffset(value) is None:
+                raise TypeError("datetime tzinfo is required")
+            value = value.astimezone(timezone.utc).replace(tzinfo=None)
+        return value
+
+    def process_result_value(self, value: Optional[datetime], dialect):
+        if value is not None:
+            value = value.replace(tzinfo=timezone.utc)
+        return value