Undo the deletion of some tables (#6047)

This is a partial revert of #5893. The problem is that if we drop these tables in the same release as removing the code that writes to them, it prevents users users from being able to roll back to a previous release. So let's leave the tables in place for now, and remember to drop them in a subsequent release. (Note that these tables haven't been *read* for *years*, so any missing rows resulting from a temporary upgrade to vNext won't cause a problem.)
matrix-org · Sep 19, 2019 · bcd9132 · bcd9132
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commit bcd9132
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diff --git a/changelog.d/5893.misc b/changelog.d/5893.misc
@@ -1 +1 @@
-Drop some unused tables.
+Stop populating some unused tables.
diff --git a/changelog.d/6047.misc b/changelog.d/6047.misc
@@ -0,0 +1,2 @@
+Stop populating some unused tables.
+
diff --git a/synapse/storage/schema/delta/56/drop_unused_event_tables.sql b/synapse/storage/schema/delta/56/drop_unused_event_tables.sql