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-- 040_user_last_chat_at.sql
-- λ§ˆμ§€λ§‰ 'λŒ€ν™”' μ‹œκ° β€” μ±„νŒ…/μš΄μ „λͺ¨λ“œ WS κ°€ μ‚¬μš©μž λ°œν™” μ‹œ κ°±μ‹ .
-- κΈ°μ‘΄ users.last_seen_at(일반 접속, session_tracker) κ³Ό ꡬ뢄: 이것은 μ‹€μ œ λŒ€ν™” ν™œλ™ μ‹œκ°.
-- λ‹€μŒ μ„Έμ…˜ μ‹œμž‘ μ‹œ [접속 정보] 블둝에 "λ§ˆμ§€λ§‰ λŒ€ν™”: ..." 둜 LLM μ»¨ν…μŠ€νŠΈμ— μ£Όμž….
--
-- 적용: Supabase SQL Editor μ—μ„œ μ‹€ν–‰. IF NOT EXISTS 둜 μž¬μ‹€ν–‰ 무해.

ALTER TABLE user_settings
  ADD COLUMN IF NOT EXISTS last_chat_at TIMESTAMPTZ DEFAULT NULL,
  ADD COLUMN IF NOT EXISTS last_chat_location TEXT DEFAULT NULL;

COMMENT ON COLUMN user_settings.last_chat_at IS
  'λ§ˆμ§€λ§‰ λŒ€ν™”(μ±„νŒ…/μš΄μ „λͺ¨λ“œ μ‚¬μš©μž λ°œν™”) μ‹œκ° UTC. λ‹€μŒ μ„Έμ…˜ [접속 정보] μ»¨ν…μŠ€νŠΈμ— μ£Όμž…. last_seen_at(전체 접속)κ³Ό ꡬ뢄.';
COMMENT ON COLUMN user_settings.last_chat_location IS
  'λ§ˆμ§€λ§‰ λŒ€ν™” μ‹œμ μ˜ 접속 μœ„μΉ˜(κ΅­κ°€/κ΄‘μ—­/μ‹œκ΅°κ΅¬/동). λŒ€ν™” μ‹œκ°κ³Ό ν•¨κ»˜ λ‹€μŒ μ„Έμ…˜ μ»¨ν…μŠ€νŠΈμ— μ£Όμž….';