Add --skip-migrations flag to ETL runner

[rickyrombo]

Summary

• Adds skipMigrations field and SetSkipMigrations() method to the ETL Indexer
• Adds --skip-migrations CLI flag to examples/etl
• When set, skips db.RunMigrations() on startup — useful when running against a restored production snapshot that already has all tables, avoiding slow CREATE INDEX IF NOT EXISTS on large tables

Test plan

• Verified locally against a restored DP snapshot (107M-row blocks table) — ETL starts immediately without hanging on migration index creation

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds an opt-in way for the ETL Indexer (and the examples/etl runner) to skip running DB migrations on startup, which can significantly reduce startup time when pointing at an already-migrated/restored production snapshot.

Changes:

• Add skipMigrations to etl.Indexer with a SetSkipMigrations() setter.
• Gate db.RunMigrations() behind the new skipMigrations flag in Indexer.Run().
• Add --skip-migrations flag to examples/etl and wire it into the indexer.

Reviewed changes

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

File	Description
pkg/etl/indexer.go	Conditionally skips running ETL DB migrations during Run() based on skipMigrations.
pkg/etl/etl.go	Adds skipMigrations state and a setter on the Indexer.
examples/etl/main.go	Adds and wires --skip-migrations CLI flag for local ETL runner usage.

Comments suppressed due to low confidence (1)

examples/etl/main.go:78

• --skip-migrations is applied via an if block and its value isn’t included in the startup log fields. For consistency with other boolean setters (and to make it obvious in logs when migrations are being skipped), consider calling indexer.SetSkipMigrations(*skipMigrations) unconditionally and adding a skip_migrations field to the logger.Info("starting ETL local runner", ...) call.

	if *skipMigrations {
		indexer.SetSkipMigrations(true)
	}

	logger.Info("starting ETL local runner",
		zap.String("rpc", *rpcURL),
		zap.String("db", *dbURL),
		zap.Int64("start_block", *startBlock),
	)

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