Merge pull request 'Run the SQLite-only FTS deadlock step only on SQLite' (#227) from fix/search-deadlock-test-pg-dialect into main

internal/store/search_deadlock_run_timing_test.go

@@ -84,21 +84,24 @@ func TestSearchDeadlockRegression(t *testing.T) {
 	})
 
 	// 2. Content FTS scan: pred callback queries the same Store
-	runBounded("searchKnowledgeFTSCandidates", func() {
-		hits, err := st.searchKnowledgeFTSCandidates(func(d core.KnowledgeDoc) bool {
-			_, qerr := st.GetAccountByOwner(d.Owner)
-			if qerr != nil {
-				t.Errorf("GetAccountByOwner failed in callback: %v", qerr)
+	// knowledge_fts MATCH is SQLite FTS5 only; production never calls it on PostgreSQL.
+	if st.Dialect() == "sqlite" {
+		runBounded("searchKnowledgeFTSCandidates", func() {
+			hits, err := st.searchKnowledgeFTSCandidates(func(d core.KnowledgeDoc) bool {
+				_, qerr := st.GetAccountByOwner(d.Owner)
+				if qerr != nil {
+					t.Errorf("GetAccountByOwner failed in callback: %v", qerr)
+				}
+				return true
+			}, core.RetrievalQuery{Text: "database optimization", TopK: 5}, true)
+			if err != nil {
+				t.Errorf("searchKnowledgeFTSCandidates failed: %v", err)
 			}
-			return true
-		}, core.RetrievalQuery{Text: "database optimization", TopK: 5}, true)
-		if err != nil {
-			t.Errorf("searchKnowledgeFTSCandidates failed: %v", err)
-		}
-		if len(hits) == 0 {
-			t.Errorf("expected at least 1 hit, got 0")
-		}
-	})
+			if len(hits) == 0 {
+				t.Errorf("expected at least 1 hit, got 0")
+			}
+		})
+	}
 
 	// 3. Content LIKE scan: pred callback queries the same Store
 	runBounded("searchKnowledgeLikeSharedCandidates", func() {