-- Create accounts table CREATE TABLE accounts ( account_id BIGINT PRIMARY KEY, balance DECIMAL(20, 2) NOT NULL ); -- Create transactions table for audit purposes CREATE TABLE transactions ( transaction_id UUID PRIMARY KEY DEFAULT gen_random_uuid(), source_account_id BIGINT NOT NULL, destination_account_id BIGINT NOT NULL, amount DECIMAL(20, 2) NOT NULL, created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(), FOREIGN KEY (source_account_id) REFERENCES accounts (account_id), FOREIGN KEY (destination_account_id) REFERENCES accounts (account_id) );