Speed up getting last event

[evgeny-stakewise]

No description provided.

[Copilot]

Pull request overview

This PR aims to speed up fetching the most recent on-chain contract event by scanning block ranges in parallel with a configurable concurrency limit.

Changes:

• Add MAX_CONCURRENCY/max_concurrency configuration to control parallelism for event log scans.
• Update _get_last_event to query multiple block chunks concurrently (batching) instead of strictly sequentially.
• Document the new environment variable in .env.example.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/config/settings.py	Introduces max_concurrency setting used to batch parallel event log queries.
src/common/contracts.py	Refactors last-event scan logic to run batched concurrent get_logs calls.
.env.example	Adds example MAX_CONCURRENCY configuration and comments.

Comments suppressed due to low confidence (2)

src/common/contracts.py:61

• Building the full ranges list upfront can allocate a large list when from_block is far in the past, even though only one batch is needed in the common case. Consider generating chunk ranges lazily and processing them batch-by-batch to avoid extra memory/time overhead.

        # Build all chunk ranges from newest to oldest
        ranges: list[tuple[BlockNumber, BlockNumber]] = []
        current_to = to_block
        while current_to >= from_block:
            chunk_from = BlockNumber(max(current_to - blocks_range, from_block))
            ranges.append((chunk_from, BlockNumber(current_to)))
            current_to = BlockNumber(current_to - blocks_range - 1)

.env.example:21

• The example sets MAX_CONCURRENCY=10, but the code default is 8. Consider aligning the example with the default (or documenting why the recommended value differs) to avoid confusing operators.

# Maximum number of parallel event scan queries
MAX_CONCURRENCY=10

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