Add user-portal mapping to database

database/upgrades/2019-05-28-user-portal-table.go

@@ -0,0 +1,19 @@
+package upgrades
+
+import (
+	"database/sql"
+)
+
+func init() {
+	upgrades[6] = upgrade{"Add user-portal mapping table", func(dialect Dialect, tx *sql.Tx, db *sql.DB) error {
+		_, err := tx.Exec(`CREATE TABLE user_portal (
+			user_jid        VARCHAR(255),
+			portal_jid      VARCHAR(255),
+			portal_receiver VARCHAR(255),
+			PRIMARY KEY (user_jid, portal_jid, portal_receiver),
+			FOREIGN KEY (user_jid)                    REFERENCES "user"(jid)           ON DELETE CASCADE,
+			FOREIGN KEY (portal_jid, portal_receiver) REFERENCES portal(jid, receiver) ON DELETE CASCADE
+		)`)
+		return err
+	}}
+}