X_SUBSCRIPTION_LIMIT

socket, actor, tenant or node hit its subscription cap

a component subscribing in a loop, or one client minting distinct (query, input) pairs — a qid derives from client-chosen input, so the node holds a matcher and a row window per value. The scope in the message says which ceiling refused

the actor scope: raise realtime.maxSubscriptionsPerActor in app.config.ts (default 1,000). Otherwise raise maxPerSocket / maxPerTenant / maxEntries on new LiveQueryRegistry({…}), or maxTopicsPerSocket / maxTopicsPerNode on new ChannelHub({…}) — none of those is an app.config.ts field