Cleanup some SQL variables

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Merging #598 (58c901a) into main (1e65bee) will not change coverage.
The diff coverage is 61.53%.

@@           Coverage Diff           @@
##             main     #598   +/-   ##
=======================================
  Coverage   61.77%   61.77%           
=======================================
  Files         127      127           
  Lines        8952     8952           
=======================================
  Hits         5530     5530           
  Misses       2555     2555           
  Partials      867      867           

Impacted Files	Coverage Δ
core/models/campaigns.go	45.31% <0.00%> (ø)
core/models/resthooks.go	54.54% <0.00%> (ø)
core/models/channel_logs.go	52.08% <50.00%> (ø)
core/models/channel_connection.go	25.16% <100.00%> (ø)
core/models/channel_event.go	76.92% <100.00%> (ø)
core/models/imports.go	69.93% <100.00%> (ø)
core/models/incident.go	68.83% <100.00%> (ø)
core/models/webhook_event.go	84.61% <100.00%> (ø)

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