pg_user_mapping stores the mappings from local user to remote. Access to this catalog is restricted from normal users, use the view
| || ||Row identifier (hidden attribute; must be explicitly selected)|
| || || ||OID of the local role being mapped, 0 if the user mapping is public|
| || || ||The OID of the foreign server that contains this mapping|
| || ||User mapping specific options, as "keyword=value" strings|
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