Standardize structs and add error handling

[SimranMakhija7]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.51965% with 96 lines in your changes are missing coverage. Please review.

Project coverage is 83.30%. Comparing base (a9bad65) to head (8a12a01).

Files	Patch %	Lines
src/handlers/table_handler.rs	78.26%	27 Missing and 8 partials ⚠️
src/repository/table.rs	88.75%	11 Missing and 7 partials ⚠️
src/handlers/namespace_handler.rs	85.29%	14 Missing and 1 partial ⚠️
src/database/database.rs	87.95%	6 Missing and 4 partials ⚠️
src/dto/errors.rs	90.00%	8 Missing ⚠️
src/repository/namespace.rs	95.69%	1 Missing and 3 partials ⚠️
src/routes/namespace.rs	0.00%	4 Missing ⚠️
src/dto/namespace_data.rs	97.72%	0 Missing and 1 partial ⚠️
src/dto/table_data.rs	98.36%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   78.43%   83.30%   +4.87%     
==========================================
  Files          15       16       +1     
  Lines        1062     1336     +274     
  Branches     1062     1336     +274     
==========================================
+ Hits          833     1113     +280     
+ Misses        189      179      -10     
- Partials       40       44       +4     

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