Move Unexecuted Set to Database

[brentongunning]

Reduces memory requirements and start-up time by moving the unexecuted transaction set out of memory and into the database. Run-DB will now startup but the transactions will not start executing right away. They will be loaded from the database in the background, so after a minute or two you should start to see transactions execute. For testing purposes, I also changed the API=none to not download transactions by default, which is probably also what people would expect it to do.

Results

• Memory usage hovers around 2GB on my machine after the change
• Execution speed seems a little slower, probably because of the increase in db queries

[codecov[bot]]

Codecov Report

Merging #14 (66173e5) into master (35e3e50) will increase coverage by 2.29%. The diff coverage is 80.35%.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
+ Coverage   81.37%   83.67%   +2.29%     
==========================================
  Files           9        9              
  Lines         988      888     -100     
==========================================
- Hits          804      743      -61     
+ Misses        184      145      -39     

Impacted Files	Coverage Δ
src/server.js	65.98% <ø> (+1.51%)	:arrow_up:
src/database.js	83.33% <79.62%> (+4.55%)	:arrow_up:
src/downloader.js	74.00% <100.00%> (+0.53%)	:arrow_up:
src/indexer.js	90.11% <100.00%> (+0.34%)	:arrow_up:

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