refactor: move UUID function to schema.sql and remove migrations folder

- Moved string_to_portfolio_uuid function from migrations to schema.sql
- Removed database/migrations/ folder (not needed for new project)
- All database functions now in single schema.sql file

database/migrations/add_uuid_functions.sql

@@ -1,20 +0,0 @@
--- Enable uuid-ossp extension for uuid_generate_v5
-CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
-
--- Helper function to convert strings to UUIDs
-CREATE OR REPLACE FUNCTION string_to_portfolio_uuid(input_string TEXT)
-RETURNS UUID
-LANGUAGE plpgsql
-IMMUTABLE
-SECURITY INVOKER
-SET search_path = ''
-AS $$
-BEGIN
-    -- Use URL namespace for consistency
-    -- Fully qualify function names when search_path is empty
-    RETURN public.uuid_generate_v5(public.uuid_ns_url(), input_string);
-END;
-$$;
-
--- Grant execute to authenticated and anon roles
-GRANT EXECUTE ON FUNCTION string_to_portfolio_uuid TO authenticated, anon;

database/schema.sql

@@ -4,6 +4,24 @@
 -- Enable UUID extension (if not already enabled)
 CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
 
+-- Helper function to convert strings to UUIDs (for demo portfolio IDs)
+CREATE OR REPLACE FUNCTION string_to_portfolio_uuid(input_string TEXT)
+RETURNS UUID
+LANGUAGE plpgsql
+IMMUTABLE
+SECURITY INVOKER
+SET search_path = ''
+AS $$
+BEGIN
+    -- Use URL namespace for consistency
+    -- Fully qualify function names when search_path is empty
+    RETURN public.uuid_generate_v5(public.uuid_ns_url(), input_string);
+END;
+$$;
+
+-- Grant execute to authenticated and anon roles
+GRANT EXECUTE ON FUNCTION string_to_portfolio_uuid TO authenticated, anon;
+
 -- Users table (linked to Supabase Auth - CRITICAL FIX)
 CREATE TABLE IF NOT EXISTS users (
     id UUID PRIMARY KEY REFERENCES auth.users(id) ON DELETE CASCADE,