Bugfix/104/modify database schema

[spuday90]

closes #104

Note: Schema changed as per comment https://github.com/adeekshith/watomatic/pull/127#issuecomment-786378819

[adeekshith]

Need to test three things (mostly notes to myself):

• [ ] Are we migrating database? If yes need to test migration or else can check this
• [ ] Verify it is working by just running the app
• [ ] Verify it is working by manually querying or viewing the database

[spuday90]

Need to test three things (mostly notes to myself):

* [ ]  Are we migrating database? If yes need to test migration or else can check this

* [ ]  Verify it is working by just running the app

* [ ]  Verify it is working by manually querying or viewing the database

1. As we are using new db name it will like a fresh implementation no migration
2. Also to some extent i have extracted the database from device and checked. still you do your testing, everybody's perspective will be different

[adeekshith]

Looks good but just give me a day. Consider this approved and can fork on top of this if working on something else.

In the process of making F-Droid submission. So will merge this to master after F-Droid build is done.