2 files changed, 19 insertions, 0 deletions
diff --git a/src/include/taler_error_codes.h b/src/include/taler_error_codes.h
index 754681b41..35dceb7c4 100644
--- a/src/include/taler_error_codes.h
+++ b/src/include/taler_error_codes.h
@@ -175,6 +175,11 @@ enum TALER_ErrorCode
    */
   TALER_EC_PAYTO_MALFORMED = 1013,
 
+  /**
+   * We failed to update the database of known coins.
+   */
+  TALER_EC_DB_COIN_HISTORY_STORE_ERROR = 1014,
+
   /* ********** request-specific error codes ************* */
 
   /**
diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h
index 6e5947377..b06bc7409 100644
--- a/src/include/taler_exchangedb_plugin.h
+++ b/src/include/taler_exchangedb_plugin.h
@@ -1398,6 +1398,20 @@ struct TALER_EXCHANGEDB_Plugin
 
 
   /**
+   * Make sure the given @a coin is known to the database.
+   *
+   * @param cls database connection plugin state
+   * @param session database session
+   * @param coin the coin that must be made known
+   * @return database transaction status, non-negative on success
+   */
+  enum GNUNET_DB_QueryStatus
+  (*ensure_coin_known) (void *cls,
+                        struct TALER_EXCHANGEDB_Session *session,
+                        const struct TALER_CoinPublicInfo *coin);
+
+
+  /**
    * Check if we have the specified deposit already in the database.
    *
    * @param cls the @e cls of this struct with the plugin-specific state