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Update importing-postgres.md

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typos an suggestion to expand search/replace statement to not replace on wrong places.
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@ -48,7 +48,7 @@ where `synapse_user` is the database username from the previous Synapse installa
This can be verified by examining the dump for ALTER TABLE statements which set OWNER TO that username:
```Shell
$ grep "ALTER TABLE" homeserver.sql"
$ grep "ALTER TABLE" homeserver.sql
ALTER TABLE public.access_tokens OWNER TO synapse_user;
ALTER TABLE public.account_data OWNER TO synapse_user;
ALTER TABLE public.account_data_max_stream_id OWNER TO synapse_user;
@ -60,10 +60,10 @@ ALTER TABLE public.application_services_state OWNER TO synapse_user;
It can be worked around by changing the username to `synapse`, for example by using `sed`:
```Shell
$ sed -i "s/synapse_user/synapse/g" homeserver.sql
$ sed -i "s/OWNER TO synapse_user;/OWNER TO synapse;/g" homeserver.sql
```
This uses sed to perform an 'in-place' (`-i`) replacement globally (`/g`), searching for `synapse user` and replacing with `synapse` (`s/synapse_user/synapse`). If your database username was different, change `synapse_user` to that username instead.
This uses sed to perform an 'in-place' (`-i`) replacement globally (`/g`), searching for `synapse_user` and replacing with `synapse` (`s/synapse_user/synapse`). If your database username was different, change `synapse_user` to that username instead. Expand search/replace statement as shown in example above, in case of old user name like `matrix` - replacing `matrix` only would... well - you can imagine.
Note that if the previous import failed with an error it may have made changes which are incompatible with re-running the import task right away; if you do so it may fail with an error such as: