Add migration 002: missing updated_at columns + auto-update triggers + indexes

Tables fixed:
- rooms              → added updated_at
- housekeeping_tasks → added updated_at
- channels           → added created_at + updated_at

Trigger function set_updated_at() attached to all 6 tables (hotels, users,
rooms, bookings, housekeeping_tasks, channels) — updated_at now auto-sets
on every UPDATE via BEFORE UPDATE trigger.

Indexes added for archiving / range queries:
- bookings(hotel_id, created_at), bookings(hotel_id, updated_at)
- housekeeping_tasks(hotel_id, created_at)
- rooms(hotel_id, updated_at)
- channels(hotel_id, updated_at)

Also patched 001_schema.sql so fresh installs start correct.
Migration runner is idempotent — skips already applied files.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/migrations/001_schema.sql

@@ -43,6 +43,7 @@ CREATE TABLE IF NOT EXISTS rooms (
   amenities       TEXT[]        NOT NULL DEFAULT '{}',
   notes           TEXT,
   created_at      TIMESTAMPTZ   NOT NULL DEFAULT NOW(),
+  updated_at      TIMESTAMPTZ   NOT NULL DEFAULT NOW(),
   UNIQUE(hotel_id, number)
 );
 
@@ -84,7 +85,8 @@ CREATE TABLE IF NOT EXISTS housekeeping_tasks (
   notes        TEXT,
   due_date     DATE,
   completed_at TIMESTAMPTZ,
-  created_at   TIMESTAMPTZ  NOT NULL DEFAULT NOW()
+  created_at   TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
+  updated_at   TIMESTAMPTZ  NOT NULL DEFAULT NOW()
 );
 
 -- ── Channels ───────────────────────────────────────────────────────────────
@@ -97,6 +99,8 @@ CREATE TABLE IF NOT EXISTS channels (
   api_key_encrypted TEXT,
   hotel_external_id VARCHAR(255),
   last_synced_at    TIMESTAMPTZ,
+  created_at        TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
+  updated_at        TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
   UNIQUE(hotel_id, name)
 );
 

backend/migrations/002_timestamps.sql

@@ -0,0 +1,75 @@
+-- Migration 002 — Add missing updated_at columns and auto-update trigger
+-- ─────────────────────────────────────────────────────────────────────────────
+-- Tables audit:
+--   hotels             ✅ created_at  ✅ updated_at
+--   users              ✅ created_at  ✅ updated_at
+--   rooms              ✅ created_at  ❌ updated_at  ← add
+--   bookings           ✅ created_at  ✅ updated_at
+--   housekeeping_tasks ✅ created_at  ❌ updated_at  ← add
+--   channels           ❌ created_at  ❌ updated_at  ← add both
+-- ─────────────────────────────────────────────────────────────────────────────
+
+-- ── 1. Add missing columns ──────────────────────────────────────────────────
+
+ALTER TABLE rooms
+  ADD COLUMN IF NOT EXISTS updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW();
+
+ALTER TABLE housekeeping_tasks
+  ADD COLUMN IF NOT EXISTS updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW();
+
+ALTER TABLE channels
+  ADD COLUMN IF NOT EXISTS created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW();
+
+-- ── 2. Trigger function: auto-set updated_at = NOW() on every UPDATE ────────
+
+CREATE OR REPLACE FUNCTION set_updated_at()
+RETURNS TRIGGER AS $$
+BEGIN
+  NEW.updated_at = NOW();
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+-- ── 3. Attach trigger to every table that has updated_at ────────────────────
+--    Using DROP IF EXISTS + CREATE so the migration is idempotent.
+
+DROP TRIGGER IF EXISTS trg_hotels_updated_at             ON hotels;
+DROP TRIGGER IF EXISTS trg_users_updated_at              ON users;
+DROP TRIGGER IF EXISTS trg_rooms_updated_at              ON rooms;
+DROP TRIGGER IF EXISTS trg_bookings_updated_at           ON bookings;
+DROP TRIGGER IF EXISTS trg_housekeeping_tasks_updated_at ON housekeeping_tasks;
+DROP TRIGGER IF EXISTS trg_channels_updated_at           ON channels;
+
+CREATE TRIGGER trg_hotels_updated_at
+  BEFORE UPDATE ON hotels
+  FOR EACH ROW EXECUTE FUNCTION set_updated_at();
+
+CREATE TRIGGER trg_users_updated_at
+  BEFORE UPDATE ON users
+  FOR EACH ROW EXECUTE FUNCTION set_updated_at();
+
+CREATE TRIGGER trg_rooms_updated_at
+  BEFORE UPDATE ON rooms
+  FOR EACH ROW EXECUTE FUNCTION set_updated_at();
+
+CREATE TRIGGER trg_bookings_updated_at
+  BEFORE UPDATE ON bookings
+  FOR EACH ROW EXECUTE FUNCTION set_updated_at();
+
+CREATE TRIGGER trg_housekeeping_tasks_updated_at
+  BEFORE UPDATE ON housekeeping_tasks
+  FOR EACH ROW EXECUTE FUNCTION set_updated_at();
+
+CREATE TRIGGER trg_channels_updated_at
+  BEFORE UPDATE ON channels
+  FOR EACH ROW EXECUTE FUNCTION set_updated_at();
+
+-- ── 4. Indexes on created_at for archiving / range queries ──────────────────
+--    Нужны чтобы запрос "дай все записи старше 6 месяцев" работал быстро.
+
+CREATE INDEX IF NOT EXISTS idx_bookings_created_at           ON bookings(hotel_id, created_at);
+CREATE INDEX IF NOT EXISTS idx_bookings_updated_at           ON bookings(hotel_id, updated_at);
+CREATE INDEX IF NOT EXISTS idx_housekeeping_tasks_created_at ON housekeeping_tasks(hotel_id, created_at);
+CREATE INDEX IF NOT EXISTS idx_rooms_updated_at              ON rooms(hotel_id, updated_at);
+CREATE INDEX IF NOT EXISTS idx_channels_updated_at           ON channels(hotel_id, updated_at);