Rewriting some code and adding docs.

[Fazendaaa]

Since making some functions as higher-order functions would improve the code coverage in the project I've changed that and added some documentation to the database part.

[coveralls]

Pull Request Test Coverage Report for Build 139

• 26 of 26 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+3.3%) to 98.697%

---

Totals
Change from base Build 136:	3.3%
Covered Lines:	181
Relevant Lines:	184

---

💛 - Coveralls

[Fazendaaa]

Need to remove the Moment typing.