CREATE TABLE IF NOT EXISTS payment_import_batches (
  id INT AUTO_INCREMENT PRIMARY KEY,
  tenant_id INT NOT NULL,
  original_filename VARCHAR(255) NOT NULL,
  checksum CHAR(64) NOT NULL,
  status VARCHAR(30) NOT NULL DEFAULT 'previewed',
  created_by_user_id INT NULL,
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  committed_at DATETIME NULL,
  KEY idx_payment_import_batches_tenant (tenant_id, created_at),
  CONSTRAINT fk_payment_import_batches_tenant
    FOREIGN KEY (tenant_id) REFERENCES tenants(id)
    ON DELETE CASCADE,
  CONSTRAINT fk_payment_import_batches_created_by_user
    FOREIGN KEY (created_by_user_id) REFERENCES users(id)
    ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS payment_import_rows (
  id INT AUTO_INCREMENT PRIMARY KEY,
  batch_id INT NOT NULL,
  row_num INT NOT NULL,
  participant_id INT NULL,
  raw_name VARCHAR(255) NOT NULL,
  amount_cents INT NOT NULL,
  booked_at DATETIME NOT NULL,
  status VARCHAR(30) NOT NULL,
  raw_json TEXT NULL,
  ledger_entry_id INT NULL,
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  KEY idx_payment_import_rows_batch (batch_id),
  KEY idx_payment_import_rows_participant (participant_id),
  CONSTRAINT fk_payment_import_rows_batch
    FOREIGN KEY (batch_id) REFERENCES payment_import_batches(id)
    ON DELETE CASCADE,
  CONSTRAINT fk_payment_import_rows_participant
    FOREIGN KEY (participant_id) REFERENCES participants(id)
    ON DELETE SET NULL,
  CONSTRAINT fk_payment_import_rows_ledger_entry
    FOREIGN KEY (ledger_entry_id) REFERENCES ledger_entries(id)
    ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

SET @schema_name = DATABASE();

SET @sql = (
  SELECT IF(
    EXISTS (
      SELECT 1
      FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS
      WHERE TABLE_SCHEMA = @schema_name
        AND TABLE_NAME = 'ledger_entries'
        AND CONSTRAINT_NAME = 'fk_ledger_entries_import_batch'
    ),
    'SELECT 1',
    'ALTER TABLE ledger_entries ADD CONSTRAINT fk_ledger_entries_import_batch FOREIGN KEY (import_batch_id) REFERENCES payment_import_batches(id) ON DELETE SET NULL'
  )
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;