set chunk size to 2000 for events

[dmytrotkk]

This pull request introduces a new configuration option to control the size of block ranges used when querying event logs, and updates the codebase to use this new setting. This change allows for more flexible and efficient event fetching by making the chunk size configurable.

Configuration improvements:

• Added a new events_chunk_size option to the [agent] section in config.toml.example to specify the block range size for event log queries.
• Updated the Agent model in configs.py to include the new events_chunk_size configuration with a default value of 2000.

Event fetching logic update:

• Modified the distribute_credits_for_source function in main.py to pass the configurable chunk_size parameter when fetching payment received events, improving control over event log query performance.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.84%. Comparing base (b1d3cf5) to head (01b66c0).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #61   +/-   ##
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  Coverage    84.84%   84.84%           
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  Files            5        5           
  Lines           99       99           
  Branches        17       26    +9     
========================================
  Hits            84       84           
  Misses          15       15           

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[Copilot]

Pull request overview

This PR makes the credit-distributor’s event log fetch window configurable, so the agent can tune how many blocks it scans per RPC query when reading PaymentReceived events from source CreditStation contracts.

Changes:

• Added agent.events_chunk_size to the distributor config model with a default of 2000.
• Documented the new option in config.toml.example.
• Wired the configured chunk size into distribute_credits_for_source() when fetching payment events.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
credit-distributor/src/main.py	Passes the configured chunk size into payment event retrieval.
credit-distributor/src/configs.py	Adds the new agent config field and default value.
credit-distributor/config.toml.example	Documents the new optional events_chunk_size setting.

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