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The date histogram aggregation constructs a histogram for date fields. 
SELECT pdb.agg('{"date_histogram": {"field": "created_at", "fixed_interval": "30d"}}')
FROM mock_items
WHERE id @@@ pdb.all();
Expected Response

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 {"buckets": [{"key": 1679616000000.0, "doc_count": 14, "key_as_string": "2023-03-24T00:00:00Z"}, {"key": 1682208000000.0, "doc_count": 27, "key_as_string": "2023-04-23T00:00:00Z"}]}
(1 row)
See the Tantivy documentation for all available options.