fix datetime issue (#29)

feat/postgresql-integration (#25)

viz-refactor-12apr (#23)

Improve date parsing to reduce errors

Display upload errors to user, better prompts for chart layouts (#17)

Table generation and download (#12)

Process nested JSON files (#10)

Upload 2 files (#4)

Add time series sales data as an example dataset (#2)

fix missing init file

Upload 11 files