repository: enforce valid epoch status transitions

[vfusco]

No description provided.

[Copilot]

Pull request overview

Adds database-level enforcement for epoch status state-machine transitions and updates repository logic/tests to respect the new constraints, improving crash-recovery safety and data integrity across epoch processing.

Changes:

• Introduce a Postgres trigger (enforce_epoch_status_transition) to validate epoch status transitions and require proof fields when entering CLAIM_COMPUTED.
• Make CreateEpochsAndInputs upserts preserve non-OPEN epochs (crash-recovery guard) and tighten StoreClaimAndProofs to only advance epochs from INPUTS_PROCESSED.
• Update integration/repository tests with a helper to advance epochs through valid transitions.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
test/validator/validator_test.go	Adjusts validator integration tests to move epochs through CLOSED -> INPUTS_PROCESSED before storing claims.
internal/repository/repotest/epoch_test_cases.go	Adds new test coverage for upsert guarding and DB-trigger transition enforcement.
internal/repository/repotest/claimer_test_cases.go	Switches tests to use AdvanceEpochStatus helper for valid transitions.
internal/repository/repotest/bulk_test_cases.go	Updates bulk-operation tests to satisfy new preconditions for StoreClaimAndProofs.
internal/repository/repotest/builders.go	Introduces AdvanceEpochStatus helper and dummy-proof setup for tests.
internal/repository/postgres/schema/migrations/000001_create_initial_schema.up.sql	Adds epoch-status transition trigger and required-proof-field checks.
internal/repository/postgres/schema/migrations/000001_create_initial_schema.down.sql	Adds rollback steps for the new trigger/function.
internal/repository/postgres/epoch.go	Adds guarded upsert behavior (only mutate epoch fields when existing row is OPEN).
internal/repository/postgres/bulk.go	Enforces INPUTS_PROCESSED precondition when updating epoch claim/status to CLAIM_COMPUTED.
internal/evmreader/output.go	Adds explanatory comments around marking apps inoperable on output mismatch.
internal/evmreader/input.go	Adds explanatory comments around marking apps inoperable on invalid epoch length.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

You can also share your feedback on Copilot code review. Take the survey.

The base branch was changed.