fix(postgres): render daterange values as readable ranges

Closes #5616

crates/dbx-core/tests/live_postgres_daterange.rs

@@ -0,0 +1,25 @@
+use std::time::Duration;
+
+use dbx_core::db::postgres;
+
+#[tokio::test]
+#[ignore = "requires DBX_TEST_POSTGRES_URL pointing at a PostgreSQL database"]
+async fn postgres_daterange_values_render_as_readable_ranges() {
+    let url = std::env::var("DBX_TEST_POSTGRES_URL").expect("DBX_TEST_POSTGRES_URL");
+    let pool = postgres::connect(&url, Duration::from_secs(5)).await.expect("connect postgres");
+
+    let result = postgres::execute_query(
+        &pool,
+        "SELECT daterange(DATE '2025-02-01', DATE '2025-02-06', '[)') AS bounded, \
+         'empty'::daterange AS empty, \
+         daterange(NULL, DATE '2025-02-06', '()') AS lower_unbounded",
+    )
+    .await
+    .expect("select daterange values");
+
+    assert_eq!(result.column_types, vec!["daterange", "daterange", "daterange"]);
+    assert_eq!(result.rows.len(), 1);
+    assert_eq!(result.rows[0][0].as_str(), Some("[2025-02-01,2025-02-06)"));
+    assert_eq!(result.rows[0][1].as_str(), Some("empty"));
+    assert_eq!(result.rows[0][2].as_str(), Some("(,2025-02-06)"));
+}