fix: name the steering table's constraints as the models do

[eandualem]

Fixes #228

Problem

The steering table was created as guidance under the naming convention, and migration 0019 renamed it. Its constraints kept their guidance names, because 0019 looked for Postgres's default names (guidance_pkey, ck_guidance_status_valid) instead. The model names them differently:

Constraint	Before	Model
primary key (and its index)	pk_guidance	pk_steering
check on status	ck_guidance_ck_guidance_status_valid	ck_steering_ck_steering_status_valid
foreign key to sessions	fk_guidance_session_id_sessions	fk_steering_session_id_sessions

Change

• Migration 0038 renames each constraint only while it still has its old name, and the new name is free. Renaming the primary key renames its index too. Downgrade reverses it. An installation that somehow already has the model's names is left alone.
• tests/unit/services/database/test_steering_constraint_names.py tests the migration's own behaviour against a fake connection, with no service: it renames the old names, leaves the model's names alone, and downgrade restores them.
• tests/database/test_schema_names.py is an opt-in drift check. It migrates one scratch database to head, builds another from the models with create_all, and compares every constraint and index name. It is skipped unless TEST_DATABASE_URL names a Postgres server whose role may create databases, so the local suite still needs no services.
• CI: a new database-schema job with a postgres:16-alpine service sets the URL and runs that test. The job fails if the test was skipped, so it can't silently check nothing.
• AGENTS.md: one sentence under Schema changes on what the check is and how to run it locally.
• Docstring: the create_steering docstring from A steering id used in another session sends the SQL to the client #227 named pk_guidance as the current name; it now says that name applies before 0038. The conflict is still recognised by SQLSTATE, so behaviour doesn't change.

Checks

• Drift test, live against Postgres 16:
  • With 0038, it passes.
  • With 0038 removed, it fails and names the drift: ('steering', 'ck_guidance_ck_guidance_status_valid', 'c') != ('steering', 'ck_steering_ck_steering_status_valid', 'c').
  • Its scratch databases are dropped either way.
• Migration round trip on a database at 0037: upgrade to 0038, downgrade to 0037, then upgrade again. It renames all three constraints and the primary key's index, then restores them, then renames them again.
• Full suite: 2961 passed, 1 skipped (the drift test, without TEST_DATABASE_URL) after the rebase onto 1b9438e; ruff check and format are clean. The drift test also passes live on the rebased branch.
• The new CI job ran for the first time on this PR and passed with 1 passed, not skipped.

The changelog gains a Fixed line for this migration, and "Upgrading from 0.3.0" now gives the range as 0027 to 0038. Both were added at the rebase onto #233.

Review

• Independent review: Codex gpt-6-astra, high effort, 1 round, 0 findings.
• Diff: 7 files, +251/−3. The test form (the unit test plus the opt-in check with its CI job) and the AGENTS.md sentence were decided on The steering table's constraints still carry their guidance names #228.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Database upgrades now align steering-table constraint names with the application’s expected schema, helping prevent inconsistencies between upgraded and newly created databases.
• Reliability
  • Database schema checks now run in continuous integration against PostgreSQL, including comparisons of constraints and indexes after migrations. Migration tests also verify that constraint names can be updated and restored.

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⚙️ Run configuration

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Reviewing files that changed from the base of the PR and between 82e577f and fcd806d.

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• tests/database/test_schema_names.py

📝 Walkthrough

Walkthrough

Migration 0038 conditionally renames three steering table constraints to match model metadata. New unit and PostgreSQL-backed tests verify the renames and schema-name parity. CI runs the PostgreSQL-backed tests.

Changes

Steering schema names

Layer / File(s)	Summary
Rename steering constraints alembic/versions/20260929_000000_steering_constraint_names.py, tests/unit/services/database/test_steering_constraint_names.py, src/assistant_runtime/app/assistant/_session_persistence.py, CHANGELOG.md	Migration 0038 conditionally renames the primary-key, check, and foreign-key constraints, and reverses those renames on downgrade. Unit tests cover both directions. The changelog and docstring identify the migration and prior constraint name.
Check migrated schema parity tests/database/test_schema_names.py, .github/workflows/ci.yml, AGENTS.md	The PostgreSQL-backed test compares constraint and index names in a migrated database with names from model metadata. CI runs the test with PostgreSQL 16 and requires passed tests with no skips. The schema instructions describe the test and its database requirement.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Low

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 6.25% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 4 files. (3 skipped: 3…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: renaming the steering table constraints to match the model definitions.
Linked Issues check	✅ Passed	The PR implements the coding requirements in issue [#228]. Migration 0038 conditionally renames the steering primary key, status check, and session foreign key from the guidance names to the mod…
Out of Scope Changes check	✅ Passed	The changes stay within issue [#228]. The migration, migration tests, schema-drift test, CI job, migration documentation, changelog, and pre-migration constraint-name documentation support the constra…

Full details: Docstring Coverage

Explanation

Docstring coverage is 6.25% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 4 files. (3 skipped: 3 unsupported.)

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[eandualem]

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Actionable comments posted: 1

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Inline comments:
Review comments at @tests/database/test_schema_names.py:
- Around line 43-49: Update _config and DatabaseConfig to preserve URL query
parameters when rebuilding the configuration, including ssl=require. Store the
parsed url.query in DatabaseConfig and reuse those parameters when constructing
the asyncpg URL, adding the socket host parameter without discarding existing
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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: dc81d82f-4d2d-4169-86d4-d3fafd790262

📥 Commits

Reviewing files that changed from the base of the PR and between 1b9438e and 82e577f.

📒 Files selected for processing (8)

• .github/workflows/ci.yml
• AGENTS.md
• CHANGELOG.md
• alembic/versions/20260929_000000_steering_constraint_names.py
• src/assistant_runtime/app/assistant/_session_persistence.py
• tests/database/__init__.py
• tests/database/test_schema_names.py
• tests/unit/services/database/test_steering_constraint_names.py

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[eandualem]

[from:assistant-runtime] Merge note for fcd806d.

• CodeRabbit reviewed 82e577f and posted 1 actionable comment: the opt-in test dropped TEST_DATABASE_URL options such as ssl=require.
  • The concern is valid. Its suggested fix, a query field on DatabaseConfig, would add a runtime setting, so it wasn't taken.
  • fcd806d makes the test refuse a URL with options, naming them, before creating anything. Checked live both ways; the thread is resolved.
  • The runtime's own lack of Postgres TLS settings is tracked separately in The runtime cannot require TLS for its Postgres connection #235.
• Gates:
  • Codex gpt-6-astra high, 0 findings on each of aaf2ddb (the change), 82e577f (the changelog line) and fcd806d (the fix).
  • CI 5/5 on fcd806d, including the database-schema job, which runs the drift test against Postgres.
  • After the rebase onto 1b9438e: 2961 passed, 1 skipped, and the drift test passes live. The base is unchanged since.