Postgres does not accept private AS numbers #2712

Shadowserver example data uses AS number like 4200393735

https://www.arin.net/resources/guide/asn/

There are two different formats to represent ASNs: 2-byte and 4-byte.

A 2-byte ASN is a 16-bit number. This format provides for 65,536 ASNs (0 to 65535). From these ASNs, the Internet Assigned Numbers Authority (IANA) reserved 1,023 of them (64512 to 65534) for private use.

A 4-byte ASN is a 32-bit number. This format provides for 232 or 4,294,967,296 ASNs (0 to 4294967295). IANA reserved a block of 94,967,295 ASNs (4200000000 to 4294967294) for private use.

The postgres type for source.asn/destination.asn is currently integer:
https://github.com/certtools/intelmq/blob/develop/intelmq/tests/bin/initdb.sql#L20

That does not allow such high numbers and leads to this error:

psycopg2.errors.NumericValueOutOfRange: integer out of range