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backend/database/migrations/002_add_kandang_management.sql

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+-- Migration: Add kandang management
+-- Date: 2026-02-26
+-- Description: Adds kandangs table, kandang_cycles junction table, and kandang_id to mortality_records
+-- Also auto-assigns existing mortality records to a default "Kandang 1"
+
+-- 1. Create kandangs table
+CREATE TABLE IF NOT EXISTS kandangs (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+-- 2. Create kandang_cycles junction table (doc_in_count per kandang per cycle)
+CREATE TABLE IF NOT EXISTS kandang_cycles (
+    id SERIAL PRIMARY KEY,
+    kandang_id INTEGER NOT NULL,
+    cycle_id VARCHAR(255) NOT NULL,
+    doc_in_count INTEGER NOT NULL DEFAULT 0,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (kandang_id) REFERENCES kandangs(id) ON DELETE CASCADE,
+    FOREIGN KEY (cycle_id) REFERENCES cycles(id) ON DELETE CASCADE,
+    UNIQUE(kandang_id, cycle_id)
+);
+
+-- 3. Add kandang_id column to mortality_records (nullable for backward compat)
+ALTER TABLE mortality_records
+ADD COLUMN IF NOT EXISTS kandang_id INTEGER REFERENCES kandangs(id) ON DELETE SET NULL;
+
+-- 4. Add indexes
+CREATE INDEX IF NOT EXISTS idx_mortality_kandang_id ON mortality_records(kandang_id);
+CREATE INDEX IF NOT EXISTS idx_kandang_cycles_kandang ON kandang_cycles(kandang_id);
+CREATE INDEX IF NOT EXISTS idx_kandang_cycles_cycle ON kandang_cycles(cycle_id);
+
+-- 5. Add updated_at triggers
+DROP TRIGGER IF EXISTS update_kandangs_updated_at ON kandangs;
+CREATE TRIGGER update_kandangs_updated_at BEFORE UPDATE ON kandangs
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();
+
+DROP TRIGGER IF EXISTS update_kandang_cycles_updated_at ON kandang_cycles;
+CREATE TRIGGER update_kandang_cycles_updated_at BEFORE UPDATE ON kandang_cycles
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();
+
+-- 6. Auto-assign existing data: Create default "Kandang 1" if not exists and assign all unassigned mortality records
+-- Insert default kandang (only if no kandangs exist yet)
+INSERT INTO kandangs (name)
+SELECT 'Kandang 1'
+WHERE NOT EXISTS (SELECT 1 FROM kandangs LIMIT 1);
+
+-- Assign existing mortality records to the first kandang (only records with NULL kandang_id)
+UPDATE mortality_records
+SET kandang_id = (SELECT id FROM kandangs ORDER BY id LIMIT 1)
+WHERE kandang_id IS NULL
+AND EXISTS (SELECT 1 FROM kandangs LIMIT 1);
+
+-- Create kandang_cycles entries for the default kandang for all cycles that have doc_in_count
+INSERT INTO kandang_cycles (kandang_id, cycle_id, doc_in_count)
+SELECT k.id, c.id, COALESCE(c.doc_in_count, 0)
+FROM kandangs k, cycles c
+WHERE k.id = (SELECT id FROM kandangs ORDER BY id LIMIT 1)
+AND NOT EXISTS (
+    SELECT 1 FROM kandang_cycles kc
+    WHERE kc.kandang_id = k.id AND kc.cycle_id = c.id
+);
+
+-- 7. Drop old unique constraint and add new one that includes kandang_id
+-- Note: The constraint name follows PostgreSQL naming convention
+ALTER TABLE mortality_records DROP CONSTRAINT IF EXISTS mortality_records_cycle_id_day_key;
+
+-- Create new unique index that handles kandang_id (using COALESCE for NULL safety)
+DROP INDEX IF EXISTS idx_mortality_cycle_day_kandang;
+CREATE UNIQUE INDEX idx_mortality_cycle_day_kandang
+ON mortality_records(cycle_id, day, COALESCE(kandang_id, -1));