Hybrid model: per-user surfaces (analyse, digest, chat) generated
directly in the target language via a "Respond in Italian" clause
appended to the system prompt. Shared content (strategic log)
generated in English as today, then post-translated and cached per
language in a new strategic_log_translations table. Translation calls
fan out in parallel with asyncio.gather so total job latency stays
bounded by max(single call).
No separate translation-model setting — DeepSeek-4-flash at $0.28/M
output is cheap enough that the routine cost is noise (~$0.005/day
with Italian only at 24 logs/day).
Users.lang VARCHAR(8) DEFAULT 'en'. Settings dropdown lists all four
options but ES/FR/DE are disabled UI-side and rejected server-side
against an ACTIVE_LANGUAGES allowlist — flipping them on later is a
one-line constant change.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
