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-rw-r--r--synapse/handlers/_base.py2
-rw-r--r--synapse/handlers/sync.py4
2 files changed, 4 insertions, 2 deletions
diff --git a/synapse/handlers/_base.py b/synapse/handlers/_base.py
index 525f3d39b1..6a05a65305 100644
--- a/synapse/handlers/_base.py
+++ b/synapse/handlers/_base.py
@@ -15,8 +15,6 @@
 import logging
 from typing import TYPE_CHECKING, Optional
 
-import synapse.state
-import synapse.storage
 import synapse.types
 from synapse.api.constants import EventTypes, Membership
 from synapse.api.ratelimiting import Ratelimiter
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index 150a4f291e..f30bfcc93c 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -1093,6 +1093,10 @@ class SyncHandler:
         one_time_key_counts: JsonDict = {}
         unused_fallback_key_types: List[str] = []
         if device_id:
+            # TODO: We should have a way to let clients differentiate between the states of:
+            #   * no change in OTK count since the provided since token
+            #   * the server has zero OTKs left for this device
+            #  Spec issue: https://github.com/matrix-org/matrix-doc/issues/3298
             one_time_key_counts = await self.store.count_e2e_one_time_keys(
                 user_id, device_id
             )