Add bigint as correct type for exif migrations

[viktorstrate]

Fixes #502

[codecov]

Codecov Report

Merging #553 (f322300) into master (007255b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #553   +/-   ##
=======================================
  Coverage   39.46%   39.46%           
=======================================
  Files         138      138           
  Lines        4487     4487           
  Branches      567      567           
=======================================
  Hits         1771     1771           
  Misses       2541     2541           
  Partials      175      175           

Flag	Coverage Δ
api	36.73% <ø> (ø)
ui	41.80% <ø> (ø)

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