fix(store): cap game-writeback stream with MAXLEN trimming (#58)

Add approximate MAXLEN ~1000 to all xadd calls in
GameWritebackStreamListener. Without trimming, ACKed messages
accumulate in the stream indefinitely, wasting Redis memory.

Closes NCS-88
https://knockoutwhist.youtrack.cloud/issue/NCS-88

---------

Co-authored-by: Janis Eccarius <eccariusjanis@gmail.com>
Reviewed-on: #58

modules/store/src/main/scala/de/nowchess/store/redis/GameWritebackStreamListener.scala

@@ -5,7 +5,7 @@ import de.nowchess.api.dto.GameWritebackEventDto
 import de.nowchess.store.config.RedisConfig
 import de.nowchess.store.service.GameWritebackService
 import io.quarkus.redis.datasource.RedisDataSource
-import io.quarkus.redis.datasource.stream.{StreamMessage, XGroupCreateArgs, XReadGroupArgs}
+import io.quarkus.redis.datasource.stream.{StreamMessage, XAddArgs, XGroupCreateArgs, XReadGroupArgs}
 import io.quarkus.runtime.Startup
 import jakarta.annotation.PostConstruct
 import jakarta.enterprise.context.ApplicationScoped
@@ -32,10 +32,11 @@ class GameWritebackStreamListener:
   private val log       = Logger.getLogger(classOf[GameWritebackStreamListener])
   private val groupName = "store-writeback"
 
-  private def streamKey  = s"${redisConfig.prefix}:game-writeback"
-  private def dlqKey     = s"${redisConfig.prefix}:game-writeback-dlq"
-  private val maxRetries = 3
-  private val consumerId = UUID.randomUUID().toString
+  private def streamKey    = s"${redisConfig.prefix}:game-writeback"
+  private def dlqKey       = s"${redisConfig.prefix}:game-writeback-dlq"
+  private val maxRetries   = 3
+  private val consumerId   = UUID.randomUUID().toString
+  private val maxStreamLen = 1000L
 
   @PostConstruct
   def startListening(): Unit =
@@ -98,6 +99,14 @@ class GameWritebackStreamListener:
       case Success(_)  => ()
 
   private def xadd(key: String, json: String, attempt: Int): Unit =
-    Try(redis.stream(classOf[String]).xadd(key, Map("data" -> json, "attempt" -> attempt.toString).asJava)) match
+    Try(
+      redis
+        .stream(classOf[String])
+        .xadd(
+          key,
+          new XAddArgs().maxlen(maxStreamLen).nearlyExactTrimming(),
+          Map("data" -> json, "attempt" -> attempt.toString).asJava,
+        ),
+    ) match
       case Failure(ex) => log.errorf(ex, "Failed to publish to stream %s", key)
       case Success(_)  => ()