feat: Calendar Agent + IoT Agent design + DB migration

- Deployed Calendar Agent (n8n ID: 4ZIEGck9n4l5qaDt)
  - 12 Google Calendars via HA proxy, cron 06:30
  - GPT-4.1 batch classification -> memory_facts
  - Telegram daily briefing
- DB: added source_ref column + dedup index on memory_facts
- DB: created ha_sensor_config table (IoT Agent sensor allowlist)
  - 9 seed entries (Pixel 10, Pixel Watch, EY HP, Spotify, GPS)
- README: full IoT Agent design documentation
  - Sensor allowlist (regex), LLM-based activity inference
  - Three-layer data flow, confidence-gated clarification
- README: Calendar Agent design + workflow diagram
- README: updated infra table, ADR broker, credentials
- CHANGELOG: Calendar Agent milestone

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

db/postgres.sql

@@ -56,6 +56,7 @@ CREATE TABLE IF NOT EXISTS memory_facts (
   id               UUID      PRIMARY KEY DEFAULT gen_random_uuid(),
   user_id          TEXT      NOT NULL DEFAULT 'martin',
   source           TEXT      NOT NULL,   -- 'email' | 'calendar' | 'iot' | 'paperless' | 'n8n' | ...
+  source_ref       TEXT,                 -- ID esterno per dedup (es. UID evento Google, thread_id email)
   category         TEXT,                 -- 'finance' | 'personal' | 'work' | 'health' | ...
   subject          TEXT,
   detail           JSONB,                -- payload flessibile per-source
@@ -77,6 +78,15 @@ CREATE INDEX IF NOT EXISTS idx_memory_facts_action
   ON memory_facts(user_id, action_required)
   WHERE action_required = true;
 
+CREATE INDEX IF NOT EXISTS idx_memory_facts_source_ref
+  ON memory_facts(source_ref)
+  WHERE source_ref IS NOT NULL;
+
+-- Dedup: prevents duplicate inserts for same event (used by Calendar Agent and others)
+CREATE UNIQUE INDEX IF NOT EXISTS memory_facts_dedup_idx
+  ON memory_facts(user_id, source, source_ref)
+  WHERE source_ref IS NOT NULL;
+
 
 -- =============================================================================
 -- 3. FINANCE_DOCUMENTS
@@ -163,8 +173,42 @@ CREATE INDEX IF NOT EXISTS idx_agent_msgs_expires
   WHERE expires_at IS NOT NULL AND arbiter_decision IS NULL;
 
 
+-- =============================================================================
+-- 6. HA_SENSOR_CONFIG
+--    Allowlist dinamica dei sensori Home Assistant monitorati dall'IoT Agent.
+--    Pattern = regex, matchato contro gli entity_id di Home Assistant.
+--    Evita regole hardcoded nel workflow — aggiungere sensori = INSERT.
+-- =============================================================================
+CREATE TABLE IF NOT EXISTS ha_sensor_config (
+  id          SERIAL    PRIMARY KEY,
+  pattern     TEXT      NOT NULL,          -- regex pattern (es. 'sensor\.pixel_10_.*')
+  user_id     TEXT      NOT NULL DEFAULT 'martin',
+  group_name  TEXT      NOT NULL,          -- 'mobile_device' | 'work_presence' | 'entertainment' | ...
+  description TEXT,
+  active      BOOLEAN   NOT NULL DEFAULT true,
+  created_at  TIMESTAMP NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS idx_ha_sensor_config_user
+  ON ha_sensor_config(user_id, active);
+
+-- Seed: sensori significativi per Martin
+INSERT INTO ha_sensor_config (pattern, user_id, group_name, description) VALUES
+  ('sensor\.pixel_10_.*',                  'martin', 'mobile_device',  'Tutti i sensori Pixel 10'),
+  ('binary_sensor\.pixel_10_.*',           'martin', 'mobile_device',  'Sensori binari Pixel 10'),
+  ('device_tracker\.ey_hp',               'martin', 'work_presence',  'Laptop EY (router tracker)'),
+  ('media_player\.spotify_martin',         'martin', 'entertainment',  'Spotify Martin'),
+  ('person\.martin_tahiraj',              'martin', 'presence',       'Zona GPS Martin'),
+  ('sensor\.pixel_watch_.*',              'martin', 'wearable',       'Pixel Watch 4 (futuro)'),
+  ('sensor\.pixel_10_heart_rate',         'martin', 'health',         'Frequenza cardiaca'),
+  ('sensor\.pixel_10_daily_steps',        'martin', 'health',         'Passi giornalieri'),
+  ('sensor\.pixel_10_sleep_duration',     'martin', 'health',         'Durata sonno'),
+  ('sensor\.pixel_10_next_alarm',         'martin', 'routine',        'Prossima sveglia')
+ON CONFLICT DO NOTHING;
+
+
 -- =============================================================================
 -- Fine script
 -- =============================================================================
 \echo '✅ Schema pompeo applicato correttamente.'
-\echo '   Tabelle: user_profile, memory_facts, finance_documents, behavioral_context, agent_messages'
+\echo '   Tabelle: user_profile, memory_facts, finance_documents, behavioral_context, agent_messages, ha_sensor_config'