alter table products add column if not exists canonical_name text;
update products set canonical_name = trim(brand || ' ' || model) where canonical_name is null;
alter table products alter column canonical_name set not null;

create table if not exists product_source_specs (
  id uuid primary key default gen_random_uuid(),
  product_id text not null references products(id) on delete cascade,
  source text not null check (source in ('yandex_market')),
  source_url text not null,
  source_product_id text,
  raw_group text,
  raw_label text not null,
  raw_value jsonb not null,
  normalized_key text,
  normalized_value jsonb,
  value_hash text not null,
  fetched_at timestamptz not null,
  created_at timestamptz not null default now(),
  updated_at timestamptz not null default now(),
  unique (product_id, source, source_url, raw_label)
);

create index if not exists product_source_specs_product_key_idx on product_source_specs(product_id, normalized_key);

create table if not exists moderation_conflicts (
  id uuid primary key default gen_random_uuid(),
  product_id text not null references products(id) on delete cascade,
  conflict_type text not null check (conflict_type in ('spec_value')),
  key text not null,
  values_json jsonb not null,
  state text not null default 'pending' check (state in ('pending', 'resolved', 'dismissed')),
  created_at timestamptz not null default now(),
  updated_at timestamptz not null default now(),
  unique (product_id, conflict_type, key)
);