chore: Experiment with secondary backend for ETL

[godexsoft]

This is an experiment. Do not review and/or merge.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.

Project coverage is 0.40%. Comparing base (427ba47) to head (d972eb9).
Report is 9 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/app/ClioApplication.cpp	0.00%	13 Missing ⚠️
src/migration/impl/MigrationManagerFactory.cpp	0.00%	4 Missing ⚠️
src/data/BackendInterface.hpp	0.00%	2 Missing ⚠️
.../migration/cassandra/CassandraMigrationBackend.hpp	0.00%	2 Missing ⚠️
src/migration/MigrationApplication.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #1895       +/-   ##
===========================================
- Coverage    72.71%   0.40%   -72.32%     
===========================================
  Files          333     323       -10     
  Lines        13525   13221      -304     
  Branches      6881    6769      -112     
===========================================
- Hits          9835      53     -9782     
- Misses        1785   13147    +11362     
+ Partials      1905      21     -1884     

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