feat: Update monetary column data types to DOUBLE PRECISION, add IF NOT EXISTS to column additions, and introduce a timestamp trigger function.

services/lms-service/migrations/20260215000000_monetization.sql

@@ -1,6 +1,15 @@
 -- Add price and currency to courses table in LMS
-ALTER TABLE courses ADD COLUMN price NUMERIC(10, 2) DEFAULT 0.00;
-ALTER TABLE courses ADD COLUMN currency VARCHAR(10) DEFAULT 'USD';
+ALTER TABLE courses ADD COLUMN IF NOT EXISTS price DOUBLE PRECISION DEFAULT 0.0;
+ALTER TABLE courses ADD COLUMN IF NOT EXISTS currency VARCHAR(10) DEFAULT 'USD';
+
+-- Create general trigger function if not exists
+CREATE OR REPLACE FUNCTION trigger_set_timestamp()
+RETURNS TRIGGER AS $$
+BEGIN
+  NEW.updated_at = NOW();
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
 
 -- Create transactions table
 CREATE TABLE transactions (
@@ -8,7 +17,7 @@ CREATE TABLE transactions (
     organization_id UUID NOT NULL REFERENCES organizations(id),
     user_id UUID NOT NULL REFERENCES users(id),
     course_id UUID NOT NULL REFERENCES courses(id),
-    amount NUMERIC(10, 2) NOT NULL,
+    amount DOUBLE PRECISION NOT NULL,
     currency VARCHAR(10) NOT NULL,
     status TEXT NOT NULL DEFAULT 'pending', -- 'pending', 'success', 'failure'
     provider_reference TEXT,