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Document changes to schema version 61 - 64 (#10917) 

As pointed out by @richvdh, https://github.com/matrix-org/synapse/pull/10838#discussion_r715424244

Retroactively summarize `61` - `64`
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Eric Eastwood 2021-09-24 17:09:12 -05:00 committed by GitHub
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Document and summarize changes in schema version `61` - `64`.

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synapse/storage/schema/__init__.py
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@ -27,11 +27,22 @@ for more information on how this works.
Changes in SCHEMA_VERSION = 61:
- The `user_stats_historical` and `room_stats_historical` tables are not written and
are not read (previously, they were written but not read).
- MSC2716: Add `insertion_events` and `insertion_event_edges` tables to keep track
of insertion events in order to navigate historical chunks of messages.
- MSC2716: Add `chunk_events` table to track how the chunk is labeled and
determines which insertion event it points to.
Changes in SCHEMA_VERSION = 62:
- MSC2716: Add `insertion_event_extremities` table that keeps track of which
insertion events need to be backfilled.
Changes in SCHEMA_VERSION = 63:
- The `public_room_list_stream` table is not written nor read to
(previously, it was written and read to, but not for any significant purpose).
https://github.com/matrix-org/synapse/pull/10565
Changes in SCHEMA_VERSION = 64:
- MSC2716: Rename related tables and columns from "chunks" to "batches".
"""