Merge PR #216: fix/issue-150

Author: Calebux

backend/migrations/create_price_history.sql

@@ -0,0 +1,36 @@
+-- Create subscription_price_history table
+CREATE TABLE IF NOT EXISTS subscription_price_history (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  subscription_id UUID NOT NULL REFERENCES subscriptions(id) ON DELETE CASCADE,
+  old_price DECIMAL(10, 2) NOT NULL,
+  new_price DECIMAL(10, 2) NOT NULL,
+  changed_at TIMESTAMP WITH TIME ZONE DEFAULT timezone('utc'::text, now()) NOT NULL,
+  user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE
+);
+
+-- Enable RLS
+ALTER TABLE subscription_price_history ENABLE ROW LEVEL SECURITY;
+
+-- RLS Policies
+CREATE POLICY "Users can view their own price history"
+  ON subscription_price_history FOR SELECT
+  USING (auth.uid() = user_id);
+
+-- Function to handle price changes
+CREATE OR REPLACE FUNCTION handle_subscription_price_change()
+RETURNS TRIGGER AS $$
+BEGIN
+  IF (OLD.price IS DISTINCT FROM NEW.price) THEN
+    INSERT INTO subscription_price_history (subscription_id, old_price, new_price, user_id)
+    VALUES (NEW.id, OLD.price, NEW.price, NEW.user_id);
+  END IF;
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql SECURITY DEFINER;
+
+-- Trigger for price changes
+DROP TRIGGER IF EXISTS on_subscription_price_change ON subscriptions;
+CREATE TRIGGER on_subscription_price_change
+  AFTER UPDATE ON subscriptions
+  FOR EACH ROW
+  EXECUTE FUNCTION handle_subscription_price_change();