Add cache_locks table for the database cache driver

[austinderrick]

Laravel's database cache driver keeps locks in a second table, cache_locks, separate from the cache table that holds the values. Winter creates only the cache table (2015_10_01_000016_Db_Cache), which predates database cache locks. Laravel apps get the lock table from php artisan cache:table or from the migration in the app skeleton, and Winter uses neither.

A site with CACHE_DRIVER=database can read and write cache values, but every call that takes a lock fails. The failing calls include Cache::lock() and every scheduled task that uses ->withoutOverlapping() or ->onOneServer(). For those tasks, the scheduler logs the error below every minute, and the task does not run:

SQLSTATE[42S02]: Base table or view not found: 1146 Table 'winter.cache_locks' doesn't exist
(SQL: update `cache_locks` set `owner` = ..., `expiration` = ... where `key` = framework/schedule-<sha1> and ...)

Changes

• A new system migration, 2026_09_29_000033_Db_Cache_Locks, creates the lock table. The schema matches Laravel's own cache.stub: a string key primary key, a string owner, and a big integer expiration with an index.
• The migration finds the table the same way CacheManager::createDatabaseDriver() does. The name comes from cache.stores.database.lock_table (default cache_locks). The connection is lock_connection, then connection, then the default connection.
• If the table already exists, the migration skips it. Sites that hit this error may already have created the table by hand.

Summary by CodeRabbit

• New Features
  • Added a database migration that creates the configured cache lock table when it does not already exist, supporting database-backed cache locks.

[coderabbitai]

Navigate logical layers of code changes, visualize relationships, and explore their blast radius.

Walkthrough

The migration selects the configured lock connection, falling back to the database cache connection. It creates the configured lock table if it does not exist. The table has a primary string key, a string owner, and an indexed big-integer expiration. Rollback drops the table if it exists.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Merge Risk: 🟡 Moderate · up to a2465

Rolling back could delete a lock table that existed before this migration, including its rows. Protect pre-existing tables before merging.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to a2465

The migration addresses missing database-backed locks, but rolling it back can remove a lock table that it did not create. A configuration change can also cause rollback to target a different table. The risk is concentrated in migration and rollback operations rather than a newly exposed request endpoint.

Retained concerns

• Medium · reliability · observed: Rollback can delete a pre-existing cache-lock table that this migration skipped creating. Because rollback resolves the connection and table name again, a later configuration change can also make it delete a different table while leaving the originally created table behind. Either outcome can disrupt the configured lock-coordination state.

Security review details

Security Blast Radius

• inferred — The supported destructive path requires migration rollback and database schema authority. Its immediate scope is the table selected by the active cache configuration; deleting lock state could interrupt coordination for users of that table.

Trust Boundaries and Controls

• observed — The migration uses configured connection and table values and contains no request-input handling. Authorization of migration execution is outside the available source evidence.

Resilience and Maintainability Implications

• inferred — The existence guard prevents duplicate creation, but it does not preserve creator ownership across rollback. This matters to the continuity of lock-based coordination, not just migration bookkeeping.

Hardening Proposals

• proposed — Make rollback ownership and target selection explicit so it cannot remove a pre-existing table or a table selected only after configuration changes.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding the cache_locks table required by the database cache driver.

• Fix all pre-merge checks with AI

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create a new PR

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
Review comments at
@modules/system/database/migrations/2026_09_29_000033_Db_Cache_Locks.php:
- Around line 26-35: Track whether this migration creates the table in up(), and
have down() call dropIfExists() only when that persistent ownership marker
indicates the migration owns it. Preserve any pre-existing configured lock table
and its rows.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 75da05cd-8fa5-4e26-ba52-d091c2443a90

📥 Commits

Reviewing files that changed from the base of the PR and between 4ab9e5a and a246564.

📒 Files selected for processing (1)

• modules/system/database/migrations/2026_09_29_000033_Db_Cache_Locks.php

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