Use cache store remove base slaved (#13329)

This comes from two identical definitions in each of the base stores, and means the base slaved store is now empty and can be removed.

synapse/storage/databases/main/cache.py

@@ -32,6 +32,7 @@ from synapse.storage.database import (
     LoggingTransaction,
 )
 from synapse.storage.engines import PostgresEngine
+from synapse.storage.util.id_generators import MultiWriterIdGenerator
 from synapse.util.caches.descriptors import _CachedFunction
 from synapse.util.iterutils import batch_iter
 
@@ -65,6 +66,31 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
             psql_only=True,  # The table is only on postgres DBs.
         )
 
+        self._cache_id_gen: Optional[MultiWriterIdGenerator]
+        if isinstance(self.database_engine, PostgresEngine):
+            # We set the `writers` to an empty list here as we don't care about
+            # missing updates over restarts, as we'll not have anything in our
+            # caches to invalidate. (This reduces the amount of writes to the DB
+            # that happen).
+            self._cache_id_gen = MultiWriterIdGenerator(
+                db_conn,
+                database,
+                stream_name="caches",
+                instance_name=hs.get_instance_name(),
+                tables=[
+                    (
+                        "cache_invalidation_stream_by_instance",
+                        "instance_name",
+                        "stream_id",
+                    )
+                ],
+                sequence_name="cache_invalidation_stream_seq",
+                writers=[],
+            )
+
+        else:
+            self._cache_id_gen = None
+
     async def get_all_updated_caches(
         self, instance_name: str, last_id: int, current_id: int, limit: int
     ) -> Tuple[List[Tuple[int, tuple]], int, bool]: