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Hey gang, I am trying to save a <https://github.com/PrefectHQ/prefect-dbt/blob/080f31d03520f21d8733d6d51cd11d0f3afcf036/prefect_dbt/cli/credentials.py#L9|DbtCliProfile> block that contains <https://github.com/PrefectHQ/prefect-sqlalchemy/blob/2be171a2c4c714667a1317fcbbb8fcc67139a9b4/prefect_sqlalchemy/credentials.py#L91|DatabaseCredentials> for a postgres db, but am running into an error:
```dbt_cli_profile = DbtCliProfile(
    name="dbt_dwh",
    target=DEFAULT_BLOCK,
    target_configs=PostgresTargetConfigs(
        credentials=DatabaseCredentials.load(DEFAULT_BLOCK), schema="public"
    ),
)
dbt_cli_profile.save(name="dbt_dwh")```
```TypeError: Type is not JSON serializable: URL```
Has anyone else seen this?

Raised an issue too: <https://github.com/PrefectHQ/prefect-dbt/issues/106>