USAGE:
  sediment mirror-gc [-h] [--org ORG] [--retention-days RETENTION_DAYS] [--apply]
                     [--json] [--database-url DATABASE_URL]
                     [--mirror-path MIRROR_PATH]

  Reclaim bare mirrors for repos with no recent Push activity.

OPTIONS:
  -h, --help            show this help message and exit
  --org ORG             org id (default: $SEDIMENT_ORG_ID)
  --retention-days RETENTION_DAYS
                        days of no Push before a mirror is eligible for removal
                        (default: 90)
  --apply               actually delete eligible mirrors (default: dry-run,
                        print only)
  --json                emit JSON instead of a text report
  --database-url DATABASE_URL
                        PostgreSQL URL (default: $SEDIMENT_DATABASE_URL)
  --mirror-path MIRROR_PATH
                        base dir for git mirrors (default: $SEDIMENT_MIRROR_PATH
                        or './mirrors')
