-- Rollback migration: Remove ISO timestamp columns

-- Drop triggers
DROP TRIGGER IF EXISTS trigger_transactions_timestamp_iso ON transactions;
DROP TRIGGER IF EXISTS trigger_blocks_timestamp_iso ON blocks;

-- Drop functions
DROP FUNCTION IF EXISTS update_transaction_timestamp_iso();
DROP FUNCTION IF EXISTS update_timestamp_iso();

-- Drop indexes
DROP INDEX IF EXISTS idx_transactions_chain_timestamp_iso;
DROP INDEX IF EXISTS idx_blocks_chain_timestamp_iso;

-- Drop columns
ALTER TABLE transactions DROP COLUMN IF EXISTS timestamp_iso;
ALTER TABLE blocks DROP COLUMN IF EXISTS timestamp_iso;