refactor: normalize database structure

[XadillaX]

Some points:

• let module name be 214. (refer)
• indexes (docs/db.sql only):
  • let uniq indexes starts with uk_;
  • let other indexes starts with idx_;

Because sqlite's index namespace is the whole database, two tables can't have the same index name. I didn't add the index names to models/*.js.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@3141437). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1376   +/-   ##
=========================================
  Coverage          ?   86.88%           
=========================================
  Files             ?       88           
  Lines             ?     3759           
  Branches          ?      723           
=========================================
  Hits              ?     3266           
  Misses            ?      493           
  Partials          ?        0

Impacted Files	Coverage Δ
models/download_total.js	100% <ø> (ø)
models/module_deps.js	100% <ø> (ø)
models/module_unpublished.js	100% <ø> (ø)
models/module.js	100% <ø> (ø)
models/total.js	16.66% <ø> (ø)
models/tag.js	100% <ø> (ø)
models/module_maintainer.js	100% <ø> (ø)
models/user.js	91.66% <ø> (ø)
models/module_keyword.js	100% <ø> (ø)
models/module_log.js	100% <ø> (ø)
... and 4 more

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[fengmk2]

+1

[Mg303030]

Magdi _ail_alhad