Banner impression data is stored as CSV in multiple files and need to be parsed.

Acceptance Criteria

• For each file the following data is determined for storing into the database:
  • Start of the timespan for which the impression data was aggregated
  • Banner name
  • Impression count
• Bad lines are logged/reported

Implementation Notes

• The file is named banner_impressions_YYYYMMDD_hhmm.csv, using the beginning of the time span in UTC.
• The file contains comma-separated values:
  • Banner name
  • Impression count (extrapolated)
• Should return a data object containing the date, banner name and impression count for each CSV line