Home Assistant Integration Migration

This skill is an entry point for two distinct migration concerns:

Config Entry Version Migration

When your config entry schema changes (renaming keys, adding required fields), you need to increment VERSION and implement async_migrate_entry.

See ha-config-migration for the full pattern and template.

When to use it: You changed what's stored in entry.data or entry.options and existing users' data needs to be transformed.

Deprecation Fixes

When upgrading to a newer HA version, imports, type annotations, and API patterns that were deprecated may now emit warnings or fail.

See ha-deprecation-fixes for 2024–2025 deprecation patterns with before/after examples.

When to use it: You see deprecation warnings in HA logs, or you're upgrading homeassistant minimum version in hacs.json.

Migration Checklist (Per Version Upgrade)

Check the Home Assistant Developer Blog for breaking changes
Search for deprecated imports in your code

Run check-patterns.py to detect common issues:

python3 scripts/check-patterns.py custom_components/my_integration/

Update minimum HA version in hacs.json
Test against target HA version

Related Skills

Config entry migration → ha-config-migration
Deprecation patterns → ha-deprecation-fixes
Integration structure → ha-integration-scaffold