diff --git a/membershipworks/migrations/0003_transaction_unique_sid_timestamp.py b/membershipworks/migrations/0003_transaction_unique_sid_timestamp.py
new file mode 100644
index 0000000..fad8a52
--- /dev/null
+++ b/membershipworks/migrations/0003_transaction_unique_sid_timestamp.py
@@ -0,0 +1,18 @@
+# Generated by Django 5.1 on 2024-09-02 16:29
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("membershipworks", "0002_historical_member_and_flags"),
+    ]
+
+    operations = [
+        migrations.AddConstraint(
+            model_name="transaction",
+            constraint=models.UniqueConstraint(
+                models.F("sid"), models.F("timestamp"), name="unique_sid_timestamp"
+            ),
+        ),
+    ]
diff --git a/membershipworks/models.py b/membershipworks/models.py
index e6a13cf..8502061 100644
--- a/membershipworks/models.py
+++ b/membershipworks/models.py
@@ -373,6 +373,9 @@ class Transaction(BaseModel):
 
     class Meta:
         db_table = "transactions"
+        constraints = [
+            models.UniqueConstraint("sid", "timestamp", name="unique_sid_timestamp")
+        ]
 
     def __str__(self):
         return f"{self.type} [{self.member if self.member else self.name}] {self.timestamp}"
diff --git a/membershipworks/tasks/scrape.py b/membershipworks/tasks/scrape.py
index 6a004f7..119c4b0 100644
--- a/membershipworks/tasks/scrape.py
+++ b/membershipworks/tasks/scrape.py
@@ -70,27 +70,47 @@ def scrape_members(membershipworks: MembershipWorks):
 def scrape_transactions(membershipworks: MembershipWorks):
     now = datetime.now()
     start_date = datetime(2010, 1, 1)
-    last_transaction = Transaction.objects.order_by("timestamp").last()
-    if last_transaction is not None:
-        # technically this has the potential to lose
-        # transactions, but it should be incredibly unlikely
-        start_date = last_transaction.timestamp + timedelta(seconds=1)
-
-    logger.info(f"Getting/Updating transactions since {start_date}...")
 
     transactions_csv = membershipworks.get_transactions(start_date, now)
     transactions_json = membershipworks.get_transactions(start_date, now, json=True)
     # this is terrible, but as long as the dates are the same, should be fiiiine
-    transactions = [
+    transactions_data = [
         {**j, **v} for j, v in zip(transactions_csv, transactions_json, strict=True)
     ]
     assert all(
         t["Account ID"] == t.get("uid", "") and t["Payment ID"] == t.get("sid", "")
-        for t in transactions
+        for t in transactions_data
     )
 
-    for csv_transaction in transactions:
-        Transaction.from_api_dict(csv_transaction).save()
+    transactions = [
+        Transaction.from_api_dict(transaction) for transaction in transactions_data
+    ]
+    Transaction.objects.bulk_create(
+        transactions,
+        update_conflicts=True,
+        update_fields=(
+            "member",
+            "type",
+            "sum",
+            "fee",
+            "event_id",
+            "for_what",
+            "items",
+            "discount_code",
+            "note",
+            "name",
+            "contact_person",
+            "full_address",
+            "street",
+            "city",
+            "state_province",
+            "postal_code",
+            "country",
+            "phone",
+            "email",
+        ),
+        unique_fields=("sid", "timestamp"),
+    )
 
 
 @q_task_group("Scrape MembershipWorks Data")