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Add checks for postgres sequence consistency (#8402)

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Erik Johnston 2020-09-28 18:00:30 +01:00 • committed by GitHub
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@ -106,6 +106,17 @@ Note that the above may fail with an error about duplicate rows if corruption
has already occurred, and such duplicate rows will need to be manually removed.
## Fixing inconsistent sequences error
Synapse uses Postgres sequences to generate IDs for various tables. A sequence
and associated table can get out of sync if, for example, Synapse has been
downgraded and then upgraded again.
To fix the issue shut down Synapse (including any and all workers) and run the
SQL command included in the error message. Once done Synapse should start
successfully.
## Tuning Postgres
The default settings should be fine for most deployments. For larger