docs: document how auto-create table works #29
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When a metric is received that does not have a corresponding table, it will search for a function named `_create` in the schema where the extension is installed. If such a function is found, it will be called with the metric, an array of tags, and an array of field names that was part of the packet. If the function returns an OID of a relation, that will be used to as target for the row. If `InvalidOid` is returned, it is assumed that no table is created and the row will be ignored.
mkindahl
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