reduce number of warnings

[synfinatic]

Re-evaluate every Warnf and choose a more accurate
log level as appropriate.

Fixes: #205

[codecov]

Codecov Report

Merging #218 (bf1aaac) into main (c4b2ea8) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #218   +/-   ##
=======================================
  Coverage   41.24%   41.24%           
=======================================
  Files          10       10           
  Lines        1622     1622           
=======================================
  Hits          669      669           
  Misses        897      897           
  Partials       56       56           

Impacted Files	Coverage Δ
sso/settings.go	58.86% <0.00%> (ø)
storage/json_store.go	85.07% <0.00%> (ø)

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