Add use layer 7 proxy for reactive pg client

extensions/reactive-pg-client/runtime/src/main/java/io/quarkus/reactive/pg/client/runtime/DataSourceReactivePostgreSQLConfig.java

@@ -5,6 +5,7 @@
 
 import io.quarkus.runtime.annotations.ConfigDocDefault;
 import io.quarkus.runtime.annotations.ConfigGroup;
+import io.smallrye.config.WithDefault;
 import io.vertx.pgclient.SslMode;
 
 @ConfigGroup
@@ -23,4 +24,13 @@ public interface DataSourceReactivePostgreSQLConfig {
      */
     @ConfigDocDefault("disable")
     Optional<SslMode> sslMode();
+
+    /**
+     * Level 7 proxies can load balance queries on several connections to the actual database.
+     * When it happens, the client can be confused by the lack of session affinity and unwanted errors can happen like
+     * ERROR: unnamed prepared statement does not exist (26000).
+     * See <a href="https://vertx.io/docs/vertx-pg-client/java/#_using_a_level_7_proxy">Using a level 7 proxy</a>
+     */
+    @WithDefault("false")
+    boolean useLayer7Proxy();
 }

extensions/reactive-pg-client/runtime/src/main/java/io/quarkus/reactive/pg/client/runtime/PgPoolRecorder.java

@@ -207,6 +207,8 @@ private List<PgConnectOptions> toPgConnectOptions(String dataSourceName, DataSou
                 }
             }
 
+            pgConnectOptions.setUseLayer7Proxy(dataSourceReactivePostgreSQLConfig.useLayer7Proxy());
+
             pgConnectOptions.setTrustAll(dataSourceReactiveRuntimeConfig.trustAll());
 
             configurePemTrustOptions(pgConnectOptions, dataSourceReactiveRuntimeConfig.trustCertificatePem());