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-rw-r--r--src/database/db-interface.vala2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/database/db-interface.vala b/src/database/db-interface.vala
index be9ffba..d01e9c3 100644
--- a/src/database/db-interface.vala
+++ b/src/database/db-interface.vala
@@ -22,7 +22,7 @@ public interface Database : Object {
public abstract string get_product_name(uint64 article) throws IOError, DatabaseError;
public abstract int get_product_amount(uint64 article) throws IOError, DatabaseError;
public abstract Price get_product_price(int user, uint64 article) throws IOError, DatabaseError;
- public abstract bool undo(int32 user) throws IOError, DatabaseError;
+ public abstract string undo(int32 user) throws IOError, DatabaseError;
public abstract bool restock(int user, uint64 product, uint amount, uint price, int supplier, int64 best_before_date) throws IOError, DatabaseError;
public abstract bool new_product(uint64 id, string name, int memberprice, int guestprice) throws IOError, DatabaseError;
public abstract bool new_price(uint64 product, int64 timestamp, int memberprice, int guestprice) throws IOError, DatabaseError;