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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.
No connection string necessary, you just have to open com.plexapp.plugins.library.db, which is in the 'Plug-in Support/Databases' folder inside your data directory. Though depending on the context of your original question, it may be easier to just use the web api. Based on the request the web app makes, it will be something like PUT [host]:[port]/library/sections/[section]/all?type=[type]&id=[metadata_id]&summary.value=[url encoded summary]&summary.locked=1&X-Plex-Token=[token]. Not sure if type is needed, but if it is, you can find the values here.