What is the updated_at field?

Has anyone figured out what this field designates? Or rather, what info it’s recording and how it’s derived?
It’s a field in ten database tables and by name would appear to be for a time stamp, but its datatype is INTEGER(8). This isn’t large enough to record an epoch timestamp, so it’s not that.
There’s some sort of sequencing, but the increment is not regular.
There’s an index created for the field on every table with the field. It’s also NOT NULL (which makes sense given the existence of the index).

Basically, I want to add a record to the play_queue_generators table and need to know what updated_at means and how that number is being generated.

Example:
sqlite> select id,metadata_item_id,changed_at from play_queue_generators;
id,metadata_item_id,changed_at
4,112
5,1423
6,6,3170
7,7,17343
8,8,17345
9,17350
10,41,17359
11,20,17366
12,38,17369
13,40,17371
14,65,17373
16,59,17381
17,6,17383

Thanks!

Bumpity bump. Anyone have any info on this?

Do you mean the “changed_at” field?
I think its a time stamp.
But I am pretty not sure how it works.