fix invalid input syntax for bigint

[blankdots]

invalid input syntax for type bigint: "SHA256"

[codecov-commenter]

Codecov Report

Merging #631 (d4abf30) into master (d2caa96) will not change coverage.
Report is 2 commits behind head on master.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master     #631   +/-   ##
=======================================
  Coverage   38.53%   38.53%           
=======================================
  Files          13       13           
  Lines        3441     3441           
=======================================
  Hits         1326     1326           
  Misses       2066     2066           
  Partials       49       49           

Flag	Coverage Δ
unittests	38.53% <100.00%> (ø)

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Files	Coverage Δ
internal/database/db.go	71.33% <100.00%> (ø)

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