Usage of /usr/bin/backfill-index:
  -concurrency int
    	Number of workers to use for backfill (default 1)
  -dry-run
    	Dry run - don't actually insert into MySQL
  -end int
    	Last index to backfill (default -1)
  -mysql-dsn string
    	MySQL Data Source Name
  -redis-enable-tls
    	Enable TLS for Redis client
  -redis-hostname string
    	Hostname for Redis application
  -redis-insecure-skip-verify
    	Whether to skip TLS verification for Redis client or not
  -redis-password string
    	Password for Redis authentication
  -redis-port string
    	Port to Redis application
  -rekor-address string
    	Address for Rekor, e.g. https://rekor.sigstore.dev
  -rekor-disable-keepalives
    	Disable Keep-Alive connections (defaults to true, meaning Keep-Alive is disabled) (default true)
  -rekor-header value
    	HTTP headers for Rekor in key=value format, repeat flag to add additional headers
  -rekor-retry-count uint
    	Maximum number of times to retry rekor requests (default 3)
  -rekor-retry-wait-max duration
    	Maximum time to wait between retrying rekor requests (default 30s)
  -rekor-retry-wait-min duration
    	Minimum time to wait between retrying rekor requests (default 1s)
  -start int
    	First index to backfill (default -1)
  -version
    	Print the current version of Backfill MySQL