diff --git a/asap-quickstart/docker-compose-precompute.yml b/asap-quickstart/docker-compose-precompute.yml
index e0353ada..3d9a020c 100644
--- a/asap-quickstart/docker-compose-precompute.yml
+++ b/asap-quickstart/docker-compose-precompute.yml
@@ -128,6 +128,12 @@ services:
       - "--query-language=PROMQL"
       - "--lock-strategy=per-key"
       - "--forward-unsupported-queries"
+      # §5/§10 sketch-DB lifecycle. Without --enable-schema-eviction,
+      # Expired schemas stay resident forever and their data never
+      # gets dropped from the store; the 60s poll is tuned for demo
+      # visibility, not production — tune up for real deployments.
+      - "--enable-schema-eviction"
+      - "--schema-eviction-poll-secs=60"
     healthcheck:
       test: ["CMD-SHELL", "bash -c 'echo > /dev/tcp/localhost/8088' 2>/dev/null || exit 1"]
       interval: 10s