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orioledb
OrioleDB – building a modern cloud-native storage engine (... and solving some PostgreSQL wicked problems)
Postgres users need to deal with the infamous transaction ID wraparound, and the not-so-famous MultiXact member exhaustion. OrioleDB is tackling these issues, but it's still years until it reaches the maturity of MySQL's InnoDB.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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If your table doesn't have foreign keys, you can use GitHub's trigger-less gh-ost, otherwise, Percona's trigger-based pt-online-schema-change is also a battle-tested solution.