datasette_tags
1 row where tag = "usa"
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| Link | datasette_id | tag | 
|---|---|---|
| 3,usa | San Francisco 3 | usa | 
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CREATE TABLE datasette_tags (
            datasette_id integer,
            tag text,
            PRIMARY KEY (datasette_id, tag),
            FOREIGN KEY (datasette_id) REFERENCES datasettes(id),
            FOREIGN KEY (tag) REFERENCES tags(tag)
        );