Singleton key for singleton tasks

[ilijaNL]

No description provided.

[codecov-commenter]

Codecov Report

Merging #15 (6465077) into master (133f25c) will decrease coverage by 0.73%.
The diff coverage is 93.75%.

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@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   93.73%   93.00%   -0.73%     
==========================================
  Files          13       13              
  Lines         383      386       +3     
  Branches       52       51       -1     
==========================================
  Hits          359      359              
- Misses          5        7       +2     
- Partials       19       20       +1     

Impacted Files	Coverage Δ
src/definitions.ts	90.90% <ø> (ø)
src/messages.ts	100.00% <ø> (ø)
src/bus.ts	86.74% <75.00%> (-2.15%)	⬇️
src/sql.ts	85.18% <100.00%> (ø)
src/workers/fanout.ts	100.00% <100.00%> (ø)
src/workers/task.ts	97.77% <100.00%> (ø)

... and 1 file with indirect coverage changes