Implement idempotency TTL and enhance world stats collection

Contents/mods/RconDataBridge/common/media/lua/shared/RconDataBridge/RDB_Base64.lua

@@ -14,8 +14,6 @@
 -- path) and read via showoptions, neither of which goes through the
 -- tokenizer, so they carry raw JSON unmolested.
 
--- TODO: does output still base64 encode? otherwise the API is weird (base64 json in, json out)
-
 RDB_Base64 = {}
 
 local ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"

Contents/mods/RconDataBridge/common/media/lua/shared/RconDataBridge/RDB_Constants.lua

@@ -24,6 +24,15 @@ RDB_Constants.MAX_PAYLOAD_BYTES = 4096
 RDB_Constants.OPTION_MAX_LENGTH = 8192
 RDB_Constants.POLL_EVERY_TICKS  = 30
 
+-- How long a request id's cached response is replayed for on retry before
+-- it's treated as expired and the op runs again. Deliberately short: a
+-- client that reuses a fixed id for routine polling (e.g. "ws-poll" every
+-- few minutes) should get a fresh answer each time, not the first-ever
+-- response forever. A count-based cap alone (MAX_ENTRIES in
+-- RDB_Idempotency) doesn't help here, it only evicts under high request
+-- volume, never under low-and-slow polling, which is exactly this case.
+RDB_Constants.IDEMPOTENCY_TTL_MS = 60 * 1000
+
 RDB_Constants.ERROR_CODES = {
     SCHEMA_ERROR      = "SCHEMA_ERROR",
     PAYLOAD_TOO_LARGE = "PAYLOAD_TOO_LARGE",