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MatrixSynapse/changelog.d/14915.bugfix

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Attempt to delete more duplicate rows in receipts_linearized table. (#14915) The previous assumption was that the stream_id column was unique (for a room ID, receipt type, user ID tuple), but this turned out to be incorrect. Now find the max stream ID, then map this back to a database-specific row identifier and delete other rows which match the (room ID, receipt type, user ID) tuple, but *not* the row ID.
2023-02-01 21:45:10 +01:00
Fix a bug introduced in Synapse 1.70.0 where the background updates to add non-thread unique indexes on receipts could fail when upgrading from 1.67.0 or earlier.