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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.
So you have a pdf file that you want to add metadata to (e.g., author, title, subject, keywords) and for some reason you don't have an easy way to do so from the original source of the pdf. Here's an easy way to do this with pdfLaTeX. If you don't use LaTeX, don't worry about it. You don't really need to know LaTeX to use this trick, and I have a repository on GitHub with a LaTeX file you can edit with the details of the pdf and the metadata that you want to add to it. It doesn't matter how the original pdf was produced.
Read the comments in the file AddMetadataToPdf.tex.