first commit

database/migrations/001_subscription_lifecycle.sql

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+BEGIN;
+
+ALTER TABLE subscriptions
+  ADD COLUMN IF NOT EXISTS activation_date text,
+  ADD COLUMN IF NOT EXISTS first_payment_date text,
+  ADD COLUMN IF NOT EXISTS end_date text,
+  ADD COLUMN IF NOT EXISTS occurrence_count integer,
+  ADD COLUMN IF NOT EXISTS custom_interval_days integer;
+
+DO $$
+BEGIN
+  IF EXISTS (
+    SELECT 1
+    FROM information_schema.columns
+    WHERE table_name = 'subscriptions' AND column_name = 'renewal_date'
+  ) THEN
+    UPDATE subscriptions
+    SET
+      activation_date = COALESCE(activation_date, renewal_date),
+      first_payment_date = COALESCE(first_payment_date, renewal_date),
+      subscription_status = CASE
+        WHEN subscription_status = 'disabled' THEN 'terminated'
+        ELSE subscription_status
+      END;
+  ELSE
+    UPDATE subscriptions
+    SET subscription_status = 'terminated'
+    WHERE subscription_status = 'disabled';
+  END IF;
+END $$;
+
+ALTER TABLE subscriptions
+  ALTER COLUMN activation_date SET NOT NULL,
+  ALTER COLUMN first_payment_date SET NOT NULL;
+
+ALTER TABLE subscriptions
+  DROP COLUMN IF EXISTS renewal_date,
+  DROP COLUMN IF EXISTS auto_renew;
+
+DROP INDEX IF EXISTS subscriptions_renewal_date_idx;
+CREATE INDEX IF NOT EXISTS subscriptions_first_payment_date_idx
+  ON subscriptions(first_payment_date);
+
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1
+    FROM pg_constraint
+    WHERE conname = 'subscriptions_occurrence_count_positive'
+  ) THEN
+    ALTER TABLE subscriptions
+      ADD CONSTRAINT subscriptions_occurrence_count_positive
+      CHECK (occurrence_count > 0);
+  END IF;
+  IF NOT EXISTS (
+    SELECT 1
+    FROM pg_constraint
+    WHERE conname = 'subscriptions_custom_interval_days_positive'
+  ) THEN
+    ALTER TABLE subscriptions
+      ADD CONSTRAINT subscriptions_custom_interval_days_positive
+      CHECK (custom_interval_days > 0);
+  END IF;
+  IF NOT EXISTS (
+    SELECT 1
+    FROM pg_constraint
+    WHERE conname = 'subscriptions_amount_positive'
+  ) THEN
+    ALTER TABLE subscriptions
+      ADD CONSTRAINT subscriptions_amount_positive CHECK (amount > 0);
+  END IF;
+  IF NOT EXISTS (
+    SELECT 1
+    FROM pg_constraint
+    WHERE conname = 'subscriptions_billing_cycle_valid'
+  ) THEN
+    ALTER TABLE subscriptions
+      ADD CONSTRAINT subscriptions_billing_cycle_valid
+      CHECK (billing_cycle IN ('weekly', 'monthly', 'yearly', 'custom'));
+  END IF;
+  IF NOT EXISTS (
+    SELECT 1
+    FROM pg_constraint
+    WHERE conname = 'subscriptions_status_valid'
+  ) THEN
+    ALTER TABLE subscriptions
+      ADD CONSTRAINT subscriptions_status_valid
+      CHECK (subscription_status IN ('active', 'suspended', 'terminated'));
+  END IF;
+  IF NOT EXISTS (
+    SELECT 1
+    FROM pg_constraint
+    WHERE conname = 'subscriptions_dates_valid'
+  ) THEN
+    ALTER TABLE subscriptions
+      ADD CONSTRAINT subscriptions_dates_valid
+      CHECK (
+        activation_date <= first_payment_date
+        AND (end_date IS NULL OR end_date >= first_payment_date)
+      );
+  END IF;
+END $$;
+
+COMMIT;