added noupdate field tag to exclude column from updates

[rck109d]

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[Copilot]

PR Overview

This PR adds support for a "noupdate" field tag to exclude certain columns from update operations. It updates the table schema and model definitions, enhances tag parsing in the reflection logic, and adds corresponding test cases.

Reviewed Changes

File	Description
db_test.go	Adds a "created_at" column with the noupdate tag and updates the VersionedUser tests accordingly.
reflect_test.go	Extends test cases for tag parsing to include the noupdate flag, although with a minor error message issue.
reflect.go	Updates tag parsing to support "noupdate" and adjusts internal structures accordingly.
db.go	Modifies update planning to skip columns marked with the noupdate flag.

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

reflect_test.go:185

• The error message for the noupdate flag is incorrect, referencing 'optlock' instead of 'noupdate'. Please update the message to accurately describe the expected value.

t.Errorf("%s: expected optlock '%t', actual '%t'", c.tag, c.noupdate, noupdate)