Colonnes de dm_mega_catalog:
  id | int(11)
  provider | enum('EPEX','EEX','Nordpool','CME')
  exchange_code | varchar(20)
  product_type | enum('SPOT_POWER','POWER_FUTURE','GAS_FUTURE','GAS_SPOT','CO2_FUTURE','GO','AGRICULTURAL_FUTURE','FREIGHT_FUTURE','UNKNOWN_FUTURE','FX_FUTURE','ENERGY_FUTURE','COMMODITY_FUTURE','METALS_FUTURE')
  contract_level | enum('generic','specific')
  parent_code | varchar(50)
  product_code | varchar(100)
  product_name | varchar(200)
  scraping_method | enum('API','HTML','HYBRID')
  is_active | tinyint(1)
  auction | varchar(10)
  country_code | varchar(10)
  country_name | varchar(100)
  api_symbol | varchar(200)
  api_endpoint | varchar(500)
  api_method | varchar(20)
  contract_period | varchar(50)
  maturity_date | date
  contract_year | year(4)
  contract_quarter | tinyint(4)
  contract_month | tinyint(4)
  is_favorite | tinyint(1)
  has_year_variants | tinyint(1)
  has_quarter_variants | tinyint(1)
  has_month_variants | tinyint(1)
  target_table | varchar(100)
  delivery_type | varchar(50)
  spot_market_type | varchar(50)
  delivery_start | date
  delivery_end | date
  granularity | varchar(50)
  region | varchar(100)
  market_area | varchar(100)
  expected_records_per_day | int(11)
  expected_frequency | varchar(50)
  data_available_from | date
  data_available_to | date
  currency | varchar(10)
  unit | varchar(50)
  importance | enum('principal','secondaire','mineur')
  priority | int(11)
  is_available | tinyint(1)
  trading_status | enum('active','expired','future','suspended')
  is_deprecated | tinyint(1)
  service_id | varchar(50)
  first_seen_date | date
  last_checked_date | datetime
  activated_date | datetime
  deactivated_date | datetime
  deprecated_date | datetime
  total_scraped_records | int(11)
  last_scraped_date | date
  last_scrape_success | datetime
  last_scrape_error | datetime
  error_count | int(11)
  success_rate | decimal(5,2)
  description | text
  notes | text
  tags | varchar(500)
  config_json | longtext
  created_at | timestamp
  updated_at | timestamp
  created_by | varchar(100)
  updated_by | varchar(100)