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wp-sync-db
A WordPress plugin that lets you push, pull, and sync database tables between WordPress installations.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
There are two tools I like for this WP Sync DB (plugin installed on both sites) or the inner.connect search and replace (ran on new site after db migration).
NOTE:
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Hence, a higher number means a more popular project.