fix domains migration

server/migrations/20200510140704_domains.js

@@ -8,19 +8,24 @@ async function up(knex) {
   await models.createLinkTable(knex);
   await models.createVisitTable(knex);
 
-  await Promise.all([
-    async () => {
-      try {
-        await knex.schema.alterTable("domains", (table) => {
-          table.dropUnique([], "domains_user_id_unique");
-        });
-      } catch (ignored) {
-      }
-    },
+  // drop unique user id constraint only if database is postgres
+  // because other databases use the new version of the app and they start fresh with the correct model
+  // if i use table.dropUnique() method it would throw error on fresh install because the constraint does not exist
+  // and if it throws error, the rest of the transactions fail as well
+  if (knex.client.driverName === "pg") {
+    knex.raw(`
+      ALTER TABLE domains
+      DROP CONSTRAINT IF EXISTS domains_user_id_unique
+    `)
+  }
+
+  const hasUUID = await knex.schema.hasColumn("domains", "uuid");
+
+  if (!hasUUID) {
     await knex.schema.alterTable("domains", (table) => {
-      table.uuid("uuid").defaultTo(knex.fn.uuid());
-    }),
-  ]);
+       table.uuid("uuid").notNullable().defaultTo(knex.fn.uuid());
+     });
+   }
 }
 
 async function down() {