Merge branch 'feat/BE/Sprint-6' of https://gitlab.com/mbugroup/lti-api into feat/BE/US-279/closing-produksi

internal/database/migrations/20251210044651_create_so_number_sequence.down.sql

@@ -0,0 +1,3 @@
+-- Drop function and sequence for sales order numbers
+DROP FUNCTION IF EXISTS generate_so_number();
+DROP SEQUENCE IF EXISTS so_number_seq;

internal/database/migrations/20251210044651_create_so_number_sequence.up.sql

@@ -0,0 +1,12 @@
+-- Create sequence for sales order numbers
+CREATE SEQUENCE so_number_seq START WITH 1 INCREMENT BY 1;
+
+CREATE OR REPLACE FUNCTION generate_so_number()
+RETURNS VARCHAR AS $$
+DECLARE
+    next_val INTEGER;
+BEGIN
+    next_val := nextval('so_number_seq');
+    RETURN 'SO-' || LPAD(next_val::TEXT, 5, '0');
+END;
+$$ LANGUAGE plpgsql;