add basic migration support

utils.py

@@ -1,7 +1,25 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 import anyio
+import contextlib
 from functools import wraps
+from datetime import datetime, timezone
+
+def as_corofunc(f):
+	@wraps(f)
+	async def wrapped(*args, **kwargs):
+		# can't decide if i want an `anyio.sleep(0)` here.
+		return f(*args, **kwargs)
+	return wrapped
+
+def as_async_cm(cls):
+	@wraps(cls, updated=())  # cls.__dict__ doesn't support .update()
+	class wrapped(cls, contextlib.AbstractAsyncContextManager):
+		__aenter__ = as_corofunc(cls.__enter__)
+		__aexit__ = as_corofunc(cls.__exit__)
+	return wrapped
+
+suppress = as_async_cm(contextlib.suppress)
 
 def shield(f):
 	@wraps(f)