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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.
Automatic data retrieval and analysis to reduce errors. I used simple python scripts to fetch stash information from GGG's APIs, and used this R script to analyze/visualize the gathered data. Prophecy sealing cost was gathered manually from the PoeDB Prophecy page.
Being comfortable with data manipulation/analysis/visualization tools is important if you are doing experimental science. I strongly recommend R for PhD students, the learning curve is not the best but the power and flexibility you get in your visualizations/data manipulation stuff is very pleasant. R gallery has many hackable examples and tidyverse is worth investigating IMHO.