Decided to ditch Tiny Tiny RSS and try Miniflux instead. https://blog.ssdnodes.com/blog/rss-self-hosting/#Miniflux_56
The Docker installation guide, by the way, has moved: https://miniflux.app/docs/installation.html#docker.
Oh, one more remark: if your database password contains any special characters, you'll want to use a _urlencoded_ version in that DATABASE_URL variable.
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