Quick-win fixes: badge, exception type, is_integer, CI matrix, dead code

[joshmarkovic]

Summary

Five small, independent fixes surfaced by a repo audit. Each is its own commit, so they can be reviewed individually. They are intentionally removal-heavy and low-risk: the only behavioral change is #2, whose existing unit test is updated to match.

Branch validation (whole branch, on top of current master): ruff clean, black --check clean, mypy reports 0 errors, and pytest tests/unit → 110 passed.

1. Remove broken "Integration tests on Azure" badge — docs

README.md rendered a status badge pointing at integration-tests-azure.yml, but no such workflow exists under .github/workflows/ (only unit-tests, integration-tests-sqlserver, publish-docker, and release-version). The badge was therefore permanently broken. Removed that one badge line; the unit-test and SQL Server integration badges are unchanged.

2. Raise DbtRuntimeError instead of bare ValueError for a missing access token — fix

In sqlserver_auth.py, the ActiveDirectoryAccessToken path raised a bare ValueError when access_token / access_token_expires_on were missing. Every other configuration fault in this layer raises dbt_common.exceptions.DbtRuntimeError, so this one escaped as an unclassified exception. It now raises DbtRuntimeError (message unchanged). The existing unit test that asserted ValueError is updated to expect DbtRuntimeError.

3. Recognize tinyint in is_integer(); drop dead Postgres aliases — fix

SQLServerColumn.is_integer() listed smallserial, serial, bigserial, int2/4/8, and serial2/4/8 — Postgres types that SQL Server never returns — while omitting tinyint, a real SQL Server integer type. Replaced the list with the actual SQL Server integer set: tinyint, smallint, int, integer, bigint.

4. Drop Python 3.9 from the publish-docker matrix — ci

requires-python is >=3.10, and the unit / integration / release workflows all target 3.10–3.13, but publish-docker.yml still built CI-3.9-* client images. Those images are not consumed by any workflow. Removed "3.9" from the matrix.

5. Remove dead clone macro and unused view scaffolding variable — chore

• materializations/models/table/clone.sql defined sqlserver__create_or_replace_clone, which emits invalid T-SQL (CREATE TABLE … AS CLONE OF …). It is unreachable: sqlserver__can_clone_table() returns False, so dbt-core's clone materialization never dispatches to it, and default__create_or_replace_clone exists as the fallback regardless. Deleted the file. sqlserver__can_clone_table() (in relations/table/clone.sql) is left untouched.
• relations/views/create.sql contained a {% set tst %}SELECT '1' as col{% endset %} block that was never referenced. Removed.