diff --git a/tests/conftest.py b/tests/conftest.py
index 5bd4e67..6439552 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -51,12 +51,21 @@ def disable_rate_limiting():
 
 @pytest.fixture
 def engine():
-    """Sync in-memory SQLite engine for model unit tests."""
-    eng = create_engine("sqlite:///:memory:")
-    from cartsnitch_api.models.user import User
+    """Sync in-memory SQLite engine for model unit tests.
+
+    Strips PostgreSQL-specific server_default expressions so SQLite can
+    handle all column inserts without missing-function errors.
+    """
+    eng = create_engine("sqlite:///:memory:")
+
+    for table in Base.metadata.tables.values():
+        for col in table.columns.values():
+            sd = col.server_default
+            if sd is not None:
+                expr_str = str(sd.expression).lower()
+                if "gen_random_uuid" in expr_str or "gen_random_bytes" in expr_str:
+                    col.server_default = None
 
-    col = User.__table__.columns["email_inbound_token"]
-    col.server_default = None
     Base.metadata.create_all(eng)
     yield eng
     eng.dispose()
@@ -80,12 +89,16 @@ async def db_engine():
         cursor.execute("PRAGMA foreign_keys=ON")
         cursor.close()
 
-    async with engine.begin() as conn:
-        from cartsnitch_api.models.user import User
+    for table in Base.metadata.tables.values():
+        for col in table.columns.values():
+            sd = col.server_default
+            if sd is not None:
+                expr_str = str(sd.expression).lower()
+                if "gen_random_uuid" in expr_str or "gen_random_bytes" in expr_str:
+                    col.server_default = None
 
-        User.__table__.columns["email_inbound_token"].server_default = None
+    async with engine.begin() as conn:
         await conn.run_sync(Base.metadata.create_all)
-        # Create Better-Auth tables (not managed by SQLAlchemy models)
         await conn.execute(
             text("""
             CREATE TABLE IF NOT EXISTS sessions (
diff --git a/tests/test_encrypted_json.py b/tests/test_encrypted_json.py
index 2ef3ccb..07cf44c 100644
--- a/tests/test_encrypted_json.py
+++ b/tests/test_encrypted_json.py
@@ -17,6 +17,15 @@ from cartsnitch_api.models.user import User, UserStoreAccount
 @pytest.fixture
 def engine():
     eng = create_engine("sqlite:///:memory:")
+
+    for table in Base.metadata.tables.values():
+        for col in table.columns.values():
+            sd = col.server_default
+            if sd is not None:
+                expr_str = str(sd.expression).lower()
+                if "gen_random_uuid" in expr_str or "gen_random_bytes" in expr_str:
+                    col.server_default = None
+
     Base.metadata.create_all(eng)
     yield eng
     eng.dispose()