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    Repair Database Migration Rollback Bugs

    1

    Repair migration/rollback bugs where old and new application versions disagree on schema shape, backfills race with writes, or rollback becomes unsafe after destructive changes.

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    Repair Database Migration Rollback Bugs

    Repair Database Migration Rollback Bugs

    Example session with this skill installed

    We add a non-null canonical_email column, deploy code that writes it, backfill old rows, then want to drop the old column. Rolling back the app midway can fail because schema expectations changed. Design a safe repair using our existing migration system.

    • Read your context and instructions
    • Compiled the repair database migration

    The migration couples application compatibility to a destructive schema transition. The repair separates expand/backfill/cutover/contract phases, keeps both application versions compatible during the deployment window, makes the backfill resumable/idempotent, verifies completeness before constraints/destruction, and defines the last safe rollback point.

    Connects securely to your tools. The creator never sees your data.

    About this skill

    The problem

    Database migrations often fail during rollback or cause downtime because dual-write windows, nullable transitions, and application compatibility are handled inconsistently across the repository. Manual fixes frequently overlook state ownership or cleanup logic, leading to data corruption when a deployment is reverted.

    What it does

    • Identifies defects in expand, migrate, and contract phases to ensure zero-downtime deployments.
    • Audits old and new application code to maintain compatibility during rolling updates.
    • Fixes dual-read/write window logic and backfill ownership bugs.
    • Validates index and constraint rollout strategies against rollback boundaries.
    • Generates deterministic local fixtures and regression tests for migration verification.

    Why this beats prompting it yourself

    General prompts often ignore the "contract" phase of a migration or fail to account for concurrent state transitions. This skill enforces a canonical contract for identity and validation, ensuring that side effects and retries are bound to the specific state that created them rather than relying on broad retries or sleeps.

    Use cases

    • Fixing a migration that prevents an application from rolling back to a previous version.
    • Implementing safe dual-write logic for a high-traffic table refactor.
    • Correcting inconsistent nullability or default value transitions across microservices.
    • Adding observability and deterministic tests to brittle migration runbooks.

    Known limitations

    Does not interact with production databases, live secrets, or deployed infrastructure. Requires local repository files and fixtures to perform analysis and patching.

    Find more skills like this on the Claude Skills Marketplace, the Codex Skills Marketplace and the Gemini Skills Marketplace, or browse Claude Skills for Data & Databases.

    Cannot redesign data model intent, supported deployment topology, availability policy, retention policy, and application behavior; cannot verify production infrastructure or prove every runtime, proxy, network, storage, clock, or scheduler ordering.

    How to use

    1. 1

      Connect your agent to the Agensi MCP

      Copy the prompt and paste it into Claude, ChatGPT, Cursor or any agent that supports MCP. It sets up the connection for you. Manual setup

    2. 2

      Sign in to Agensi

      Your agent shows a sign-in link. Sign in and click Allow.

    3. 3

      Ask for what you need

      Your agent loads this skill and uses it on your task. It always asks before buying a skill.

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    Permissions

    Terminal / Shell
    Read Files
    Write Files

    Run on a clean branch with repository files and disposable local fixtures. Review patches and validation before merge. Keep production services, real credentials, customer payloads, and deployment out of scope.

    Listed2 months ago
    Updated9 days ago

    What's inside

    Frequently Asked Questions

    This skill identifies and patches logic errors in multi-phase migrations, such as missing dual-write logic or 'contract' phase failures that would otherwise make a rollback impossible or cause data corruption.

    It is designed for integration with code-capable AI agents like AutoGPT or specialized IDE agents that have access to your local repository and testing environment.

    No, this skill is designed for safety and operates exclusively on local repository files and fixtures to perform analysis, meaning it never requires access to production secrets or live databases.

    You will receive the core logic for the migration repair skill, a set of deterministic testing templates, and documentation for integrating the skill into your existing CI/CD or development agent workflow.

    While the logic is most robust for SQL-based relational databases (PostgreSQL, MySQL), it can be adapted for any system requiring a multi-phase 'expand and contract' pattern, including some NoSQL document stores.

    Buyers receive lifetime access to version updates, ensuring the skill remains compatible with evolving AI agent frameworks and emerging migration best practices.

    New in Data & Databases