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Changes between Version 1 and Version 2 of Ticket #27147, comment 8

-              v1
+              v2
         def from_db_value(self, value, expression, connection):
             # we're checking if bounds differ from default value
+            # it's needed, because psycopg2 always returns Range with '[)' bounds
+            if self.bounds[0] == '(':
+                value._lower = value._lower - unit_diff
+            if self.bounds[1] == ']':
+                value._upper = value._upper - unit_diff
+            if self.bounds[0] == '(' and value.lower:
+                value._lower = value.lower - unit_diff
+            if self.bounds[1] == ']' and value.upper:
+                value._upper = value.upper - unit_diff
             value._bounds = self.bounds
             return value