diff --git a/dibbler/models/Transaction.py b/dibbler/models/Transaction.py
index 05da1f1..845793b 100644
--- a/dibbler/models/Transaction.py
+++ b/dibbler/models/Transaction.py
@@ -66,6 +66,7 @@ EXPECTED_FIELDS: dict[TransactionType, set[str]] = {
     TransactionType.BUY_PRODUCT: {"product_count", "product_id"},
     TransactionType.JOINT: {"product_count", "product_id"},
     TransactionType.JOINT_BUY_PRODUCT: {"joint_transaction_id"},
+    TransactionType.THROW_PRODUCT: {"product_count", "product_id"},
     TransactionType.TRANSFER: {"amount", "transfer_user_id"},
 }
 
diff --git a/dibbler/models/TransactionType.py b/dibbler/models/TransactionType.py
index f1ab4c2..d823dbe 100644
--- a/dibbler/models/TransactionType.py
+++ b/dibbler/models/TransactionType.py
@@ -16,6 +16,7 @@ class TransactionType(StrEnum):
     BUY_PRODUCT = auto()
     JOINT = auto()
     JOINT_BUY_PRODUCT = auto()
+    THROW_PRODUCT = auto()
     TRANSFER = auto()
 
 
diff --git a/dibbler/queries/product_stock.py b/dibbler/queries/product_stock.py
index fb7aa4a..44d904d 100644
--- a/dibbler/queries/product_stock.py
+++ b/dibbler/queries/product_stock.py
@@ -29,28 +29,33 @@ def _product_stock_query(
                     Transaction.type_ == TransactionType.ADD_PRODUCT,
                     Transaction.product_count,
                 ),
-                (
-                    Transaction.type_ == TransactionType.BUY_PRODUCT,
-                    -Transaction.product_count,
-                ),
                 (
                     Transaction.type_ == TransactionType.ADJUST_STOCK,
                     Transaction.product_count,
                 ),
+                (
+                    Transaction.type_ == TransactionType.BUY_PRODUCT,
+                    -Transaction.product_count,
+                ),
                 (
                     Transaction.type_ == TransactionType.JOINT,
                     -Transaction.product_count,
                 ),
+                (
+                    Transaction.type_ == TransactionType.THROW_PRODUCT,
+                    -Transaction.product_count,
+                ),
                 else_=0,
             )
         )
     ).where(
         Transaction.type_.in_(
             [
-                TransactionType.BUY_PRODUCT,
                 TransactionType.ADD_PRODUCT,
                 TransactionType.ADJUST_STOCK,
+                TransactionType.BUY_PRODUCT,
                 TransactionType.JOINT,
+                TransactionType.THROW_PRODUCT,
             ]
         ),
         Transaction.product_id == product_id,
diff --git a/dibbler/queries/search_user.py b/dibbler/queries/search_user.py
index 421b794..5cc9c00 100644
--- a/dibbler/queries/search_user.py
+++ b/dibbler/queries/search_user.py
@@ -7,7 +7,6 @@ from dibbler.models import User
 def search_user(
     string: str,
     sql_session: Session,
-    ignorethisflag=None,
 ) -> User | list[User]:
     string = string.lower()
 
diff --git a/dibbler/queries/transaction_log.py b/dibbler/queries/transaction_log.py
index 998c210..af94028 100644
--- a/dibbler/queries/transaction_log.py
+++ b/dibbler/queries/transaction_log.py
@@ -9,6 +9,8 @@ from dibbler.models import (
 )
 
 
+# TODO: should this include full joint transactions that involve a user?
+# TODO: should this involve throw-away transactions that affects a user?
 def transaction_log(
     sql_session: Session,
     user: User | None = None,
diff --git a/dibbler/queries/user_balance.py b/dibbler/queries/user_balance.py
index 161502d..d590b47 100644
--- a/dibbler/queries/user_balance.py
+++ b/dibbler/queries/user_balance.py
@@ -92,6 +92,7 @@ def _user_balance_query(
                 ),
                 Transaction.type_.in_(
                     [
+                        TransactionType.THROW_PRODUCT,
                         TransactionType.ADJUST_INTEREST,
                         TransactionType.ADJUST_PENALTY,
                     ]
@@ -155,10 +156,10 @@ def _user_balance_query(
                                 #       at the moment of writing, after sound right, but maybe ask someone?
                                 # Interest
                                 * (cast(recursive_cte.c.interest_rate_percent, Float) / 100)
+                                # TODO: these should be added together, not multiplied, see specification
                                 # Penalty
                                 * case(
                                     (
-                                        # TODO: should this be <= or <?
                                         recursive_cte.c.balance < recursive_cte.c.penalty_threshold,
                                         (
                                             cast(recursive_cte.c.penalty_multiplier_percent, Float)
@@ -188,6 +189,13 @@ def _user_balance_query(
                     ),
                     recursive_cte.c.balance - trx_subset.c.amount,
                 ),
+                # Throws a product -> if the user is considered to have bought it, balance increases
+                # TODO:
+                # (
+                #     trx_subset.c.type_ == TransactionType.THROW_PRODUCT,
+                #     recursive_cte.c.balance + trx_subset.c.amount,
+                # ),
+
                 # Interest adjustment -> balance stays the same
                 # Penalty adjustment -> balance stays the same
                 else_=recursive_cte.c.balance,
diff --git a/tests/queries/test_product_stock.py b/tests/queries/test_product_stock.py
index db03018..490ddde 100644
--- a/tests/queries/test_product_stock.py
+++ b/tests/queries/test_product_stock.py
@@ -177,3 +177,7 @@ def test_product_stock_joint_transaction(sql_session: Session) -> None:
     )
 
     assert product_stock(sql_session, product) == 5 - 3
+
+
+def test_product_stock_throw_away(sql_session: Session) -> None:
+  ...
diff --git a/tests/queries/test_transaction_log.py b/tests/queries/test_transaction_log.py
index 58efad7..73cfc11 100644
--- a/tests/queries/test_transaction_log.py
+++ b/tests/queries/test_transaction_log.py
@@ -563,6 +563,7 @@ def test_transaction_log_combined_filter_product_transaction_id_transaction_type
 
     assert len(result) == 2
 
+# NOTE: see the corresponding TODO's above the function definition
 
-# NOTE: how should this work? Do we includ the entire JOINT transaction, or only the part relevant to the user?
 def test_transaction_log_filtered_by_user_joint_transactions(sql_session: Session) -> None: ...
+def test_transaction_log_filtered_by_user_throw_away_transactions(sql_session: Session) -> None: ...
diff --git a/tests/queries/test_user_balance.py b/tests/queries/test_user_balance.py
index 1f88ae8..3a9ec20 100644
--- a/tests/queries/test_user_balance.py
+++ b/tests/queries/test_user_balance.py
@@ -324,3 +324,6 @@ def test_user_balance_joint_transactions_changing_penalty(sql_session: Session):
 
 def test_user_balance_joint_transactions_penalty_interest_combined(sql_session: Session):
     pass
+
+def test_user_balance_throw_away_products(sql_session: Session):
+    pass