Possibly significantly improve how portals are created and synced

database/upgrades/2019-05-22-user-last-connection-column.go

@@ -0,0 +1,15 @@
+package upgrades
+
+import (
+	"database/sql"
+)
+
+func init() {
+	upgrades[3] = upgrade{"Add last_connection column to users", func(dialect Dialect, tx *sql.Tx) error {
+		_, err := tx.Exec(`ALTER TABLE "user" ADD COLUMN last_connection BIGINT NOT NULL DEFAULT 0`)
+		if err != nil {
+			return err
+		}
+		return nil
+	}}
+}