database: added totp codes migrations, get/add/use token

crates/database/queries/totp_login_requests/get_one.sql

@@ -0,0 +1,12 @@
+select
+    -- info
+    token,
+    user,
+
+    -- timings
+    created_at as "created_at: DateTime<Utc>",
+    expires_at as "expires_at: DateTime<Utc>",
+    used_at    as "used_at: DateTime<Utc>"
+from totp_login_requests
+
+where token is (?)

crates/database/queries/totp_login_requests/insert.sql

@@ -0,0 +1,2 @@
+insert into totp_login_requests (token, user, expires_at)
+values (?, ?, datetime(?, 'unixepoch'))

crates/database/queries/totp_login_requests/use_token.sql

@@ -0,0 +1,5 @@
+update totp_login_requests
+
+set used_at = CURRENT_TIMESTAMP
+
+where token is ?