tracking companies by id

migrator/migrations/1523022636-DOWN-change_company_to_id.sql

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+-- 1523022636 DOWN change_company_to_id
+
+delete from invoices;
+
+alter table invoices drop column company_id;
+alter table invoices add column company varchar(255);

migrator/migrations/1523022636-UP-change_company_to_id.sql

@@ -0,0 +1,6 @@
+-- 1523022636 UP change_company_to_id
+delete from invoices;
+
+alter table invoices drop column company;
+alter table invoices add column company_id integer;
+alter table invoices add constraint fk_invoices__company_id foreign key (company_id) references companies(id);