* [OnlineMigrations v0.34.0](https://github.com/fatkodima/online_migrations) – Detects and prevents unsafe PostgreSQL migrations while providing guidance for safer alternatives.

* [ActiveRecord::Summarize v0.6.0](https://github.com/midnightmonster/activerecord-summarize) – Transparently combine many reporting queries on the same tables into a single fast query even when queries have different groups or scopes.

* [DatabaseConsistency v3.0.5](https://github.com/djezzzl/database_consistency) – Tool for detecting inconsistencies and inefficiencies between database schemas and application models.