tsk-34: Update last login of user (#37)

Closes #34

Reviewed-on: phoenix/textsender-auth#37
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

migrations/schema.sql

@@ -8,12 +8,14 @@ CREATE TABLE users (
     phone_number TEXT NOT NULL,
     username TEXT NOT NULL,
     password TEXT NOT NULL,
-    created timestamptz DEFAULT now()
+    created timestamptz DEFAULT now(),
+    last_login timestamptz NULL
 );
 
 CREATE TABLE service_users (
     id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
     username TEXT NOT NULL,
     passphrase TEXT NOT NULL,
-    created timestamptz DEFAULT now()
+    created timestamptz DEFAULT now(),
+    last_login timestamptz NULL
 );