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plex-db-sync
Synchronizes the database watched status between two Plex servers. This includes watched times, and works for all users on the system without the need for tokens.
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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.
Depending on the amount of libraries and users there is a Python script that might make it easier to get everyone shared to the new server. For the curious.
Your users will also lose their watch status of media. So you may want to look into transferring that over too. You can look into plex-db-sync
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Hence, a higher number means a more popular project.