Track the IP users connect with. Add an admin column to users table.

synapse/storage/schema/delta/v5.sql

@@ -0,0 +1,13 @@
+
+CREATE TABLE IF NOT EXISTS user_ips (
+    user TEXT NOT NULL,
+    access_token TEXT NOT NULL,
+    ip TEXT NOT NULL,
+    CONSTRAINT user_ip UNIQUE (user, access_token, ip) ON CONFLICT IGNORE
+);
+
+CREATE INDEX IF NOT EXISTS user_ips_user ON user_ips(user);
+
+ALTER TABLE users ADD COLUMN admin BOOL DEFAULT 0 NOT NULL;
+
+PRAGMA user_version = 5;