Missing successful_http_head column in daily_client_retrieval_stats table
Issue Description
The daily_client_retrieval_stats and daily_allocator_retrieval_stats tables are missing the successful_http_head columns that are needed for tracking HEAD RSR metrics. As noted in the discussion, we already shipped HEAD RSR and per-client-RSR independently, but didn't implement the third piece combining these components.
Current State
Currently, the table structure includes:
day (date)
client_id (text)
total (integer)
successful (integer)
successful_http (integer)
But is missing:
successful_http_head (integer)
Proposed Solution
Add the successful_http_head column to the daily_client_retrieval_stats daily_allocator_retrieval_stats table to properly track HEAD request metrics. This will complete the integration between the HEAD RSR and per-client-RSR features.
Originally posted by @bajtos in #503 (comment)