Added critical indexes to Message Store tables

[thehenrytsai]

• Added critical indexes to Message Store tables
• Changed boolean value -> string conversion to 0/1 instead to align with SQL design guidelines and have faster lookup
• Added limits to column lengths (required by MySQL for indexed columns)
• Removed obsolete columns in Message Store tables
• Added QoL launch.json for VSC for one-click debugging

[codecov[bot]]

Codecov Report

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

Project coverage is 88.06%. Comparing base (9864bea) to head (a07f6c0).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #46 +/- ## ========================================== + Coverage 87.69% 88.06% +0.36% ========================================== Files 12 12 Lines 1569 1617 +48 Branches 227 234 +7 ========================================== + Hits 1376 1424 +48 Misses 193 193 ```