[WIP] add draft SEP for base chart handling

[dgn]

this is mainly for discussion of how to address #749 and potential other issues

cc @luksa

[dgn]

/retest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.46%. Comparing base (4a06ad0) to head (4512f96).
Report is 5 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (4a06ad0) and HEAD (4512f96). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (4a06ad0)	HEAD (4512f96)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #787      +/-   ##
==========================================
- Coverage   76.51%   70.46%   -6.06%     
==========================================
  Files          44       38       -6     
  Lines        2623     2089     -534     
==========================================
- Hits         2007     1472     -535     
+ Misses        530      493      -37     
- Partials       86      124      +38     

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