pvfree database migrated to Aiven

[Mark Mikofski]

pvfree users, if you find any issues on https://pvfree.azurewebsites.net/, try the alternate site: https://pvfree.alwaysdata.net/ - I had to migrate to a new database provider (Aiven) because the old provider, Elephant SQL, is ending service next January. Please post issues or comments on GitHub.

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