Add _active_tasks to server

[flimzy]

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[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (8aed23a) 77.38% compared to head (ff89076) 77.36%.

Files	Patch %	Lines
x/server/db.go	61.11%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #849      +/-   ##
==========================================
- Coverage   77.38%   77.36%   -0.02%     
==========================================
  Files         203      204       +1     
  Lines       14733    14737       +4     
==========================================
+ Hits        11401    11402       +1     
- Misses       2842     2844       +2     
- Partials      490      491       +1     

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