Get rid of dependency to SQLite

SQLite isn't properly supported by Hydra for a few years now[1], but Hydra still depends on it. Apart from a slightly bigger closure this can cause confusion by users since Hydra picks up SQLite rather than PostgreSQL by default if HYDRA_DBI isn't configured properly[2]

[1] 78974abb6943533c3d94c7bd3282bf738b7be61c [2] https://logs.nix.samueldr.com/nixos-dev/2020-04-10#3297342;

Created by  Maximilian Bosch  on April 10, 2020
75BCCX2TABRXQFYV73D6QU3VCT7LZUZEOWUK4X5USPWWTBTVJTLQC
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