schema: Fix values to fit by increasing type sizes

[oxzi]

The icon_image_alt column in both the host and service tables contains an image alt text. However, because it is defined as a varchar(32), many alt texts do not fit. The type has been expanded to text, as with most free text fields.

Closes #752.

When defining a TimePeriod, the maximum length of a range value was capped at 255 characters. This limitation has now also been removed by switching to the Text type.

Closes #724.

While re-reading the schema, I stumbled upon some missing properties_checksum comments that were also added.

[julianbrost]

You also have to change the schema version in the full schema files, this causes the tests to fail:

{"L":"DEBUG","T":"2024-07-29T13:28:45.972Z","M":"container output","icingadb":true,"container-name":"icinga-testing-23013c75-icingadb-1","container-id":"34ba7d25a68def80987e5409f44ee9fa245e70cb426c4ecda970b3f853d2b103","line":"2024-07-29T13:28:45.972Z\tFATAL\ticingadb\tunexpected database schema version: v3 (expected v4), please make sure you have applied all database migrations after upgrading Icinga DB"}

[oxzi]

Thanks @julianbrost, I was just debugging this and unfortunately missed this very message.

[julianbrost]

I can highly recommend grep -i -e fatal -e panic as the very first action when checking these logs 😅