-- Nouvelles colonnes sur bands pour tracker les crawls
ALTER TABLE bands ADD COLUMN IF NOT EXISTS first_seen_at   TIMESTAMPTZ;  -- quand on a découvert ce band pour la 1ère fois
ALTER TABLE bands ADD COLUMN IF NOT EXISTS crawled_at      TIMESTAMPTZ;  -- dernier crawl de la band page
ALTER TABLE bands ADD COLUMN IF NOT EXISTS crawled_hash    TEXT;          -- md5 du HTML de la band page (détection de changements)
ALTER TABLE bands ADD COLUMN IF NOT EXISTS ma_created_at   TEXT;          -- "Added" affiché par MA (texte brut, format variable)
ALTER TABLE bands ADD COLUMN IF NOT EXISTS ma_modified_at  TEXT;          -- "Last modified" affiché par MA

-- Backfill first_seen_at pour les bands existantes
UPDATE bands SET first_seen_at = created_at WHERE first_seen_at IS NULL;

CREATE INDEX IF NOT EXISTS idx_bands_crawled_at   ON bands (crawled_at);
CREATE INDEX IF NOT EXISTS idx_bands_first_seen   ON bands (first_seen_at);

-- Historique des runs de crawl
CREATE TABLE IF NOT EXISTS crawl_run (
  id             BIGSERIAL PRIMARY KEY,
  run_type       TEXT NOT NULL,       -- full_europe | incremental_additions | incremental_modified | single_band
  countries      TEXT[],              -- codes pays ciblés (null = tous)
  status         TEXT NOT NULL DEFAULT 'running',  -- running | done | error | cancelled
  started_at     TIMESTAMPTZ NOT NULL DEFAULT now(),
  finished_at    TIMESTAMPTZ,
  bands_seen     INT NOT NULL DEFAULT 0,
  bands_new      INT NOT NULL DEFAULT 0,
  bands_updated  INT NOT NULL DEFAULT 0,
  bands_enriched INT NOT NULL DEFAULT 0,
  error          TEXT
);

CREATE INDEX IF NOT EXISTS idx_crawl_run_type_started ON crawl_run (run_type, started_at DESC);

-- État persistant des crawls (dernière date/page vérifiée, etc.)
CREATE TABLE IF NOT EXISTS crawl_checkpoint (
  key        TEXT PRIMARY KEY,
  value      TEXT,
  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- Valeurs initiales
INSERT INTO crawl_checkpoint (key, value) VALUES
  ('last_additions_check',  NULL),  -- timestamp du dernier check de /archives/band-list/by/created
  ('last_modified_check',   NULL),  -- timestamp du dernier check de /archives/band-list/by/modified
  ('last_full_crawl_at',    NULL)   -- timestamp du dernier crawl complet Europe
ON CONFLICT (key) DO NOTHING;