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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.
For searching, I use a tool called rga to search through the text inside all the PDFs in my library.
I use Zotero for capturing articles (i.e. saving the PDF file and adding the corresponding BibTeX entry). I use the Better BibTeX plugin along with Zotfile. These plugins help me rename and move the downloaded PDFs into my library folder. I follow the AuthorYear naming scheme for the PDFs.
For note taking, I use org-roam, an obsidian-like tool for emacs (my text editor). For each article that I've read, I have an org-roam node (a note with proper tags) that I can reference later.
My file-manager, ranger supports tagging file with a letter. I use this feature sometime to tag PDFs of different topics.