fix: Handle duplicate key violation in voter contributions | NPG-000

[saibatizoku]

Description

Changes how voter contribution is uploaded to DB by keeping track of the unique key constraint tuple, and processing the network with the highest priority first.

Duplicate records are ignored and an error is logged.

break: CLI option for network_ids help docs updated to specify the valid network names.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[kukkok3]

LGTM