sflib: log debug messages in database

[bcoles]

Since ba0c2d1 debug messages were not logged in the database. This was a mistake. The same code pattern should have been used for the debug function as used for the status and info functions.

[codecov-commenter]

Codecov Report

Merging #1088 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1088   +/-   ##
=======================================
  Coverage   50.80%   50.81%           
=======================================
  Files         432      432           
  Lines       35091    35091           
=======================================
+ Hits        17829    17830    +1     
+ Misses      17262    17261    -1     

Impacted Files	Coverage Δ
sflib.py	68.35% <100.00%> (+0.08%)	⬆️

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