raise on exception in connection, fix operator not being considered in QueryBuilder

app/db.py

@@ -31,6 +31,7 @@ class DB:
         except Exception as e:
             if in_transaction and self._connection:
                 conn.rollback()
+            raise
         finally:
             if in_transaction:
                 self._transaction_depth -= 1
@@ -126,7 +127,7 @@ class DB:
         def where(self, condition, operator = "="):
             if isinstance(condition, dict):
                 for key, value in condition.items():
-                    self._where.append((key, "=", value))
+                    self._where.append((key, operator, value))
             elif isinstance(condition, list):
                 for c in condition:
                     self._where.append(c)