Examples
Worked data hosts you can read end to end, each just a folder you could drop onto your own server. They start from the smallest useful host and grow from there.
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A public inbox: anyone may submit a message, only you may read the messages back. One collection, an open insert endpoint and a private select endpoint.
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This site's own search. A collection of search entries filled by import, behind a public select endpoint parameterised by the query. The reference search box calls it.