pkg/database: simplify flush agents/bouncers

[mmetc]

[github-actions[bot]]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 19.64286% with 45 lines in your changes are missing coverage. Please review.

Project coverage is 52.36%. Comparing base (6dbc5fd) to head (4619e46).

Files	Patch %	Lines
pkg/database/flush.go	19.64%	43 Missing and 2 partials :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3026   +/-   ##
=======================================
  Coverage   52.36%   52.36%           
=======================================
  Files         280      280           
  Lines       35439    35422   -17     
=======================================
- Hits        18556    18548    -8     
+ Misses      15043    15030   -13     
- Partials     1840     1844    +4     

Flag	Coverage Δ
bats	40.02% <15.00%> (-0.03%)	:arrow_down:
unit-linux	34.86% <ø> (ø)
unit-windows	30.99% <19.64%> (-0.01%)	:arrow_down:

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