Use database sequence function from AGOL layer/table to generate unique integer IDs?

[Bud]

It’s possible to automatically populate the default value of an AGOL hosted feature layer GUID field using NEWID() WITH VALUES, using the Admin REST API.

https://community.esri.com/t5/arcgis-online-questions/add-guid-field-to-existing-agol-survey123-feat... 

Is there a way to do something similar, but instead of populating a GUID field, populate a sequential integer in a number field? (Or a textual ID with a prefix like SEWER-0000001 ?)

For example, is there a function similar to NEWID() that gets the next available integer for the layer/table from a database sequence?

An integer would be preferable over a GUID because it’s shorter and human-readable. All of our other asset IDs are integers or text-integer format, not GUIDs.

[Bud]

Would someone with DBA privileges in an on-prem Portal datastore database be able to poke around in a table to see if there are any database sequences used that would also be available in AGOL?

(This is more of an “out of curiosity” thing to see if we can learn anything interesting, not necessarily something that should be done in a mission-critical AGOL feature layer without testing.)

[RyanUthoff]

I'm not sure if this would be an acceptable solution for you, but you might be able to do that through AGOL Notebooks. You'd be able to define your own SQL expression to calculate the Unique ID in the format you are needing. The downside is that the calculation wouldn't be immediate. The AGOL Notebook would run either on demand or on a schedule.

https://community.esri.com/t5/arcgis-online-questions/auto-calculate-unique-id-in-hosted-feature-ser...

Attribute rules would be a good solution, but that only works on ArcGIS Enterprise and not AGOL unfortunately.