refactor ETL

[maxheld83]

No description provided.

[codecov-commenter]

Codecov Report

Merging #233 into master will decrease coverage by 7.22%.
The diff coverage is 14.89%.

@@            Coverage Diff             @@
##           master     #233      +/-   ##
==========================================
- Coverage   34.56%   27.34%   -7.23%     
==========================================
  Files           4        5       +1     
  Lines          81      128      +47     
==========================================
+ Hits           28       35       +7     
- Misses         53       93      +40     

Impacted Files	Coverage Δ
R/helpers.R	27.77% <0.00%> (-27.78%)	⬇️
R/modules.R	0.00% <0.00%> (ø)
R/data.R	81.08% <100.00%> (+4.41%)	⬆️

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[maxheld83]

@njahn82 just to make sure you're not wasting time with this; this is currently a total mess, and I haven't really figured out how I want to go about this.
Probably not worth it to try and make sense of this PR as it is now.