Disable LMDB value-cache eviction in new repo configs

docker-compose.yml

@@ -24,6 +24,15 @@ services:
       # concurrent with writes are a suspected corruption trigger upstream
       # (rdf4j#5960/#4806), so this is a backstop, not a first-line limit.
       - RDF4J_QUERY_TIMEOUT_SECONDS=${RDF4J_QUERY_TIMEOUT_SECONDS:-60}
+      # Client-side socket timeout (ms) for this app's own reads from rdf4j
+      # (Utils.getHttpRequestConfig). 10s is aggressive for a store that is slow
+      # rather than broken: the read raises QueryInterruptedException, the loader's
+      # generic retry loops treat that as transient, and the retries add load, which
+      # makes the next read slower still. That storm saturated the OVH node on
+      # 2026-08-31 and again after the migration. Raise it where rdf4j shares CPU
+      # with other services; it is a timeout, so a higher value costs nothing when
+      # reads are fast.
+      - NANOPUB_QUERY_FETCHING_SOCKET_TIMEOUT=${NANOPUB_QUERY_FETCHING_SOCKET_TIMEOUT:-10000}
       # One-shot repair/resync switch: re-streams the whole registry at startup;
       # per-repo isLoaded checks skip everything already present, so WITHOUT a
       # store wipe this fills holes (missing nanopubs) idempotently. Set it for

src/main/java/com/knowledgepixels/query/TripleStore.java

@@ -423,6 +423,16 @@ private void createRepo(String repoName) {
                 indexTypes = "spoc,posc,ospc";
             }
 
+            // valueEvictionInterval 0 disables LMDB's value-cache garbage collection.
+            // Without it, rdf4j frees unused value IDs and REUSES them; a stale reference
+            // then dereferences to a different value, which is the value-ID-remap
+            // corruption we hit eight times between 2026-08-20 and 2026-08-31 (upstream
+            // eclipse-rdf4j/rdf4j#5970). Crucially the eviction pass "is also run after
+            // opening the database" (ValueStore.java), which explains why every one of
+            // those events followed a restart of the affected store. Disabling it is the
+            // workaround recommended upstream on 2026-08-31; it costs disk (dead values
+            // are never reclaimed) but not memory — gcIds() returns early, so nothing
+            // accumulates on the heap. Revisit once the upstream race is fixed.
             String createRegularRepoQueryString =
                     "@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.\n" +
                     "@prefix rep: <http://www.openrdf.org/config/repository#>.\n" +
@@ -441,6 +451,7 @@ private void createRepo(String repoName) {
                     "            sail:sailType \"rdf4j:LmdbStore\" ;\n" +
                     "            sail:iterationCacheSyncThreshold \"10000\";\n" +
                     "            lmdb:tripleIndexes \"" + indexTypes + "\" ;\n" +
+                    "            lmdb:valueEvictionInterval 0 ;\n" +
                     "            sb:defaultQueryEvaluationMode \"STANDARD\"\n" +
                     "        ]\n"
                     + "    ].\n";
@@ -468,6 +479,7 @@ private void createRepo(String repoName) {
                     "              sail:sailType \"rdf4j:LmdbStore\" ;\n" +
                     "              sail:iterationCacheSyncThreshold \"10000\";\n" +
                     "              lmdb:tripleIndexes \"" + indexTypes + "\" ;\n" +
+                    "              lmdb:valueEvictionInterval 0 ;\n" +
                     "              sb:defaultQueryEvaluationMode \"STANDARD\"\n" +
                     "            ]\n" +
                     "        ]\n" +