The AI Sessions page Provider column displayed the wrong provider when a
session contained interceptions from multiple providers. This happened
because providers were aggregated with ARRAY_AGG(DISTINCT ... ORDER BY
provider), which sorts alphabetically. Since 'anthropic' < 'openai', a
single Anthropic Haiku title-generation interception would push
Anthropic to index 0, even when the session was primarily an OpenAI
chat.
Replace the alphabetical ARRAY_AGG with a subquery that groups providers
by count and orders them most-frequent-first (with alphabetical as
tiebreaker). The frontend already displays providers[0], so the primary
chat provider now appears correctly.
Fixes: AIGOV-403
Marcin Tojek
2b488cd5ae