Fix concat call on preflight headers

[daanboer]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.72%. Comparing base (8b6a26e) to head (09c151d).
Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1017      +/-   ##
==========================================
+ Coverage   82.95%   84.72%   +1.76%     
==========================================
  Files         181      125      -56     
  Lines        8561     7929     -632     
  Branches      889      806      -83     
==========================================
- Hits         7102     6718     -384     
+ Misses       1415     1191     -224     
+ Partials       44       20      -24     

Flag	Coverage Δ
app	?
converter	64.82% <ø> (ø)
database	82.51% <ø> (ø)
schema	92.98% <ø> (ø)

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