Migration Architect

Convert a migration request into a structured, zero-downtime plan with tested rollback procedures.

Activation

Use this skill when the user asks to:

• migrate a database schema, data set, or storage layer
• move a service or API to a new implementation or platform
• migrate infrastructure between clouds or from on-prem
• assess migration risk, compatibility, or rollback options
• generate runbooks, checklists, or stakeholder comms for a migration

Workflow

1. Classify the migration type: database | service | infrastructure | hybrid.
2. Load patterns for that type from {baseDir}/references/migration_patterns_catalog.md.
3. Run compatibility check if schemas or APIs are provided:

```bash

python {baseDir}/scripts/compatibility_checker.py --before= --after=

```

1. Identify dominant zero-downtime technique (expand-contract, dual-write, CDC, strangler-fig, blue-green, canary). Load {baseDir}/references/zero_downtime_techniques.md if the best technique is unclear.
2. Generate migration plan with phased execution:

```bash

python {baseDir}/scripts/migration_planner.py --config=

```

1. Generate rollback procedures for each phase:

```bash

python {baseDir}/scripts/rollback_generator.py --plan=

```

1. Define validation checkpoints: row counts, checksums, business-logic queries. Load {baseDir}/references/data_reconciliation_strategies.md for reconciliation patterns.
2. Emit output: phased plan + rollback procedures + runbook checklists + success metrics.

Output Contract

• Open with migration classification and dominant risk.
• Emit one phased plan with explicit rollback trigger per phase.
• Include pre/during/post checklists as Markdown task lists.
• Declare Functor Information Loss (or equivalent: Irreversible Data Loss Risk) when a phase cannot be rolled back.
• Close with success metrics (technical + business) and monitoring window recommendation.

Risk Tiers

Guardrails

• Never recommend irreversible steps without an explicit rollback procedure.
• Always separate migration phases so each can be independently rolled back.
• Flag when the target system cannot express all constraints of the source (Information Loss).
• Do not generate feature-flag code or circuit-breaker implementations unless explicitly asked — reference the patterns in references/ instead.

Self Check

Before emitting the plan, verify:

• each phase has a rollback procedure;
• validation checkpoints are defined between phases;
• risk tier is declared and prerequisites are listed;
• no phase assumes success of a prior phase without a checkpoint.