diff --git a/fec.py b/fec.py
index beb4a6b..589ae4d 100755
--- a/fec.py
+++ b/fec.py
@@ -71,14 +71,12 @@ def init(data: str | None = None):
         for committee in Committee.from_data_manager(data_manager):
             session.add(committee)
     print("Adding individual contributions...")
+    batch_size = 1_000
     with session_for_data_manager(data_manager) as session:
-        for contributions in batched(
-            tqdm(
-                Contribution.from_data_manager(data_manager),
-                unit="contribution",
-                total=70_659_611,
-            ),
-            5_000,
+        for contributions in tqdm(
+            batched(Contribution.from_data_manager(data_manager), batch_size),
+            unit="batch",
+            total=70_659_611 // batch_size,
         ):
             with session.begin():
                 session.add_all(contributions)
diff --git a/server/data/models.py b/server/data/models.py
index 98d77c5..00ff7a0 100644
--- a/server/data/models.py
+++ b/server/data/models.py
@@ -360,7 +360,11 @@ def from_data_manager(
 
 def engine_for_data_manager(data_manager: DataManager) -> sa.Engine:
     """Return an engine for the given data manager."""
-    return sa.create_engine(f"sqlite:///{data_manager.path / 'fec.db'}")
+    return sa.create_engine(
+        f"sqlite:///{data_manager.path / 'fec.db'}",
+        # connect_args={"check_same_thread": False},
+        # execution_options={"sqlite_synchronous": False, "sqlite_journal_mode": "WAL"},
+    )
 
 
 def session_for_data_manager(data_manager: DataManager) -> sao.Session: