- feat: Sales estimates APIs.

- feat: Sales invoices APIs.
- feat: Sales receipts APIs.
- WIP: Sales payment receipts.
- WIP: Purchases bills.
- WIP: Purchases payments made.

server/src/database/migrations/20200715193633_create_sale_invoices_table.js

@@ -0,0 +1,22 @@
+
+exports.up = function(knex) {
+  return knex.schema.createTable('sales_invoices', table => {
+    table.increments();
+    table.integer('customer_id');
+    table.date('invoice_date');
+    table.date('due_date');
+    table.string('invoice_no');
+    table.string('reference_no');
+    table.string('status');
+
+    table.text('invoice_message');
+    table.text('terms_conditions');
+
+    table.decimal('balance', 13, 3);
+    table.timestamps();
+  });  
+};
+
+exports.down = function(knex) {
+  return knex.schema.dropTableIfExists('sales_invoices');
+};