Consolidate SQL schema

[jdabtieu]

For INSTALL.sh and tests/conftest.py Closes #242

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (27b503d) 91.25% compared to head (177b1ba) 91.24%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #244 +/- ## ========================================== - Coverage 91.25% 91.24% -0.02% ========================================== Files 29 29 Lines 2550 2546 -4 ========================================== - Hits 2327 2323 -4 Misses 223 223 ``` | [Flag](https://app.codecov.io/gh/jdabtieu/CTFOJ/pull/244/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonathan+Wu) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/jdabtieu/CTFOJ/pull/244/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonathan+Wu) | `91.24% <100.00%> (-0.02%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonathan+Wu#carryforward-flags-in-the-pull-request-comment) to find out more.

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