drop extensions table

src/exchangedb/drop0001.sql

@@ -27,6 +27,7 @@ SELECT _v.unregister_patch('exchange-0001');
 
 -- Drops for exchange-0001.sql
 DROP TABLE IF EXISTS revolving_work_shards CASCADE;
+DROP TABLE IF EXISTS extensions CASCADE;
 DROP TABLE IF EXISTS auditors CASCADE;
 DROP TABLE IF EXISTS auditor_denom_sigs CASCADE;
 DROP TABLE IF EXISTS exchange_sign_keys CASCADE;

src/exchangedb/plugin_exchangedb_postgres.c

@@ -2746,13 +2746,9 @@ prepare_statements (struct PostgresClosure *pg)
     /* Used in #postgres_set_extension_config */
     GNUNET_PQ_make_prepare (
       "set_extension_config",
-      "WITH upsert AS "
+      "INSERT INTO extensions (name, config, config_sig) VALUES ($1, $2, $3) "
-      " (UPDATE extensions "
+      "ON CONFLICT (name) "
-      "    SET  config=$2 "
+      "DO UPDATE SET (config, config_sig) = ($2, $3)",
-      "         config_sig=$3 "
-      "   WHERE name=$1 RETURNING *) "
-      "INSERT INTO extensions (config, config_sig) VALUES ($2, $3) "
-      "WHERE NOT EXISTS (SELECT * FROM upsert);",
       3),
     /* Used in #postgres_get_extension_config */
     GNUNET_PQ_make_prepare (