-- Migration: Add cycle_feed_initial_balance table
-- Description: Store initial feed sack balance (saldo karung awal) per cycle
-- Date: 2026-05-26

CREATE TABLE IF NOT EXISTS cycle_feed_initial_balance (
    id SERIAL PRIMARY KEY,
    cycle_id VARCHAR(255) NOT NULL UNIQUE,
    saldo_awal INTEGER NOT NULL DEFAULT 0 CHECK(saldo_awal >= 0),
    created_by VARCHAR(255),
    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (cycle_id) REFERENCES cycles(id) ON DELETE CASCADE
);

-- Create index for faster lookups by cycle
CREATE INDEX IF NOT EXISTS idx_cycle_feed_initial_balance_cycle ON cycle_feed_initial_balance(cycle_id);

-- Trigger for automatic updated_at timestamp
DROP TRIGGER IF EXISTS update_cycle_feed_initial_balance_updated_at ON cycle_feed_initial_balance;
CREATE TRIGGER update_cycle_feed_initial_balance_updated_at
    BEFORE UPDATE ON cycle_feed_initial_balance
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_at_column();