fix: restore PostgreSQL range values during import

tests/test_codec.py

@@ -1,10 +1,34 @@
 import datetime
 import decimal
 import uuid
+from dataclasses import dataclass
 
+import pytest
+
+from netbox_export.services import codec
 from netbox_export.services.codec import decode_scalar, encode_scalar
 
 
+@dataclass
+class FakeRange:
+    lower: object = None
+    upper: object = None
+    bounds: str = "[)"
+    empty: bool = False
+
+    @property
+    def lower_inc(self):
+        return not self.empty and self.bounds[0] == "["
+
+    @property
+    def upper_inc(self):
+        return not self.empty and self.bounds[1] == "]"
+
+    @property
+    def isempty(self):
+        return self.empty
+
+
 def test_scalar_round_trip():
     value = {
         "decimal": decimal.Decimal("12.340"),
@@ -17,3 +41,31 @@ def test_scalar_round_trip():
 
     assert decode_scalar(encode_scalar(value)) == value
 
+
+def test_postgresql_range_round_trip(monkeypatch):
+    monkeypatch.setattr(
+        codec,
+        "_make_range",
+        lambda lower, upper, bounds, empty: FakeRange(lower, upper, bounds, empty),
+    )
+    value = FakeRange(1, 56, "[)")
+
+    encoded = encode_scalar(value)
+
+    assert encoded == {
+        "$type": "range",
+        "lower": 1,
+        "upper": 56,
+        "bounds": "[)",
+        "empty": False,
+    }
+    assert decode_scalar(encoded) == value
+
+
+def test_real_psycopg_range_round_trip():
+    pytest.importorskip("psycopg")
+    from django.db.backends.postgresql.psycopg_any import NumericRange
+
+    value = NumericRange(1, 56, "[)")
+
+    assert decode_scalar(encode_scalar(value)) == value