[Bug] Setting model-level deprecation_date does not apply to model versions

[jtcohen6]

Is this a new bug in dbt-core?

• I believe this is a new bug in dbt-core
• I have searched the existing issues, and I could not find an existing issue for this bug

Current Behavior

If I set:

models:
  - name: my_model
    config:
      contract: {enforced: true}
    deprecation_date: "2024-12-21"
    columns: [...]
    versions:
      - v: 1

Then model.my_project.my_model.v1 has a deprecation_date of null:

% dbt ls -q -s my_model --output json --output-keys unique_id deprecation_date
{"unique_id": "model.testy.my_model.v1", "deprecation_date": null}

But if I move the deprecation_date property down to the model versions property:

models:
  - name: my_model
    config:
      contract: {enforced: true}
    columns: [...]
    versions:
      - v: 1
        deprecation_date: "2024-12-21"

Then:

% dbt ls -q -s my_model --output json --output-keys unique_id deprecation_date
{"unique_id": "model.testy.my_model.v1", "deprecation_date": "2024-12-21T00:00:00+01:00"}

This is confusing and unexpected behavior.

Specifically, this came up in the context of disabling/removing versioned contracted models (most recently #11161). That should raise an error unless the model has passed its deprecation date. Users were continuing to see the error, even after configuring a passed (past?) deprecation_date, because they were configuring it on the top-level model rather than the nested versions. (#version

Expected Behavior

Setting deprecation_date for the top-level model should apply that value as default for all versions, unless they set a different deprecation_date. (I believe this would be the effect if deprecation_date were a node-level config.)

Steps To Reproduce

1. Create a model with a deprecation_date
2. Configure versions on that model with a single version (v: 1)
3. Suddenly the deprecation_date "disappears" on that model in dbt ls output / manifest

Relevant log output

No response

Environment

dbt: 1.10.0-a1 (main)

Which database adapter are you using with dbt?

No response

Additional Context

No response

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