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diff --git a/src/auditor/taler-auditor-httpd_db.h b/src/auditor/taler-auditor-httpd_db.h
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+/*
+  This file is part of TALER
+  Copyright (C) 2014-2018 GNUnet e.V.
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU General Public License as published by the Free Software
+  Foundation; either version 3, or (at your option) any later version.
+
+  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file auditor/taler-auditor-httpd_db.h
+ * @brief High-level (transactional-layer) database operations for the auditor
+ * @author Chrisitan Grothoff
+ */
+#ifndef TALER_AUDITOR_HTTPD_DB_H
+#define TALER_AUDITOR_HTTPD_DB_H
+
+#include <microhttpd.h>
+#include "taler_auditordb_plugin.h"
+
+/**
+ * Function implementing a database transaction.  Runs the transaction
+ * logic; IF it returns a non-error code, the transaction logic MUST
+ * NOT queue a MHD response.  IF it returns an hard error, the
+ * transaction logic MUST queue a MHD response and set @a mhd_ret.  IF
+ * it returns the soft error code, the function MAY be called again to
+ * retry and MUST not queue a MHD response.
+ *
+ * @param cls closure
+ * @param connection MHD request which triggered the transaction
+ * @param session database session to use
+ * @param[out] mhd_ret set to MHD response status for @a connection,
+ *             if transaction failed (!)
+ * @return transaction status
+ */
+typedef enum GNUNET_DB_QueryStatus
+(*TAH_DB_TransactionCallback)(void *cls,
+			      struct MHD_Connection *connection,
+			      struct TALER_AUDITORDB_Session *session,
+			      int *mhd_ret);
+
+
+/**
+ * Run a database transaction for @a connection.
+ * Starts a transaction and calls @a cb.  Upon success,
+ * attempts to commit the transaction.  Upon soft failures,
+ * retries @a cb a few times.  Upon hard or persistent soft
+ * errors, generates an error message for @a connection.
+ *
+ * @param connection MHD connection to run @a cb for
+ * @param name name of the transaction (for debugging)
+ * @param[out] set to MHD response code, if transaction failed
+ * @param cb callback implementing transaction logic
+ * @param cb_cls closure for @a cb, must be read-only!
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
+ */
+int
+TAH_DB_run_transaction (struct MHD_Connection *connection,
+                        const char *name,
+			int *mhd_ret,
+			TAH_DB_TransactionCallback cb,
+			void *cb_cls);
+
+
+#endif
+/* TALER_AUDITOR_HTTPD_DB_H */