-- Contract Number Counters (сквозная нумерация договоров)
CREATE TABLE IF NOT EXISTS contract_number_counters (
  id SERIAL PRIMARY KEY,
  organization_id INTEGER NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
  form_id INTEGER NOT NULL REFERENCES forms(id) ON DELETE CASCADE,
  prefix TEXT NOT NULL,
  year INTEGER NOT NULL,
  last_number INTEGER NOT NULL DEFAULT 0,
  created_at TIMESTAMP DEFAULT NOW(),
  updated_at TIMESTAMP DEFAULT NOW()
);

CREATE UNIQUE INDEX IF NOT EXISTS contract_number_counters_unique
  ON contract_number_counters (organization_id, form_id, prefix, year);