Fix advancer app starvation problem

[vfusco]

No description provided.

[Copilot]

Pull request overview

This PR addresses advancer “app starvation” by changing the advancer’s processing strategy to be fair across applications and by introducing an internal self-reschedule mechanism so services can immediately re-tick when they detect more work.

Changes:

• Advancer now processes at most one input batch per application per Step (and only the first unprocessed epoch per app), preventing a “flood” app from monopolizing processing.
• Base service.Service gains an optional self-reschedule channel (EnableReschedule + SignalReschedule) and a shutdown-in-progress flag (IsStopping()), and advancer/claimer opt into rescheduling.
• Adds supporting infra: Postgres partial index for unprocessed inputs, CLI send --async, and a bash load-test script/Makefile targets to reproduce starvation conditions.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
internal/advancer/advancer.go	Implements per-app single-batch processing and returns a “more work” signal from Step().
internal/advancer/service.go	Enables rescheduling for advancer; signals reschedule when work remains; adjusts shutdown cleanup semantics.
internal/advancer/advancer_test.go	Updates Step signature usage and adds extensive starvation/scheduling tests.
pkg/service/service.go	Adds EnableReschedule, reschedule channel plumbing, and IsStopping() tracking in the base service loop.
pkg/service/service_test.go	Adds unit tests for reschedule behavior and shutdown responsiveness.
internal/claimer/service.go	Enables rescheduling and signals it when claim pipeline progresses.
internal/claimer/claimer.go	Returns transition counts from claim state transitions to drive rescheduling decisions.
internal/claimer/claimer_test.go	Updates tests for new transition-count return values.
internal/prt/service.go	Uses IsStopping() to avoid doing work and suppress shutdown-related context errors.
internal/manager/manager.go	Returns applications in deterministic order (sorted by ID).
pkg/ethutil/ethutil.go	Adds AddInputAsync helper for high-throughput load testing.
cmd/cartesi-rollups-cli/root/send/send.go	Adds --async option to send inputs without waiting for receipts.
internal/repository/postgres/schema/migrations/000001_create_initial_schema.up.sql	Adds partial index for unprocessed inputs and lowers autovacuum scale factor on input.
internal/repository/postgres/schema/migrations/000001_create_initial_schema.down.sql	Drops the new partial index on rollback.
scripts/load-test.sh	Adds an automated starvation load test that interleaves inputs across apps and monitors processing fairness.
Makefile	Adds deploy-load-test-apps and load-test targets to run the starvation load test easily.

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[Copilot]

Pull request overview

Copilot reviewed 24 out of 24 changed files in this pull request and generated 5 comments.

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