diff --git a/alembic/versions/2026_04_17_15d1eece1f2b_make_case_created_at_non_nullable.py b/alembic/versions/2026_04_17_15d1eece1f2b_make_case_created_at_non_nullable.py
new file mode 100644
index 00000000000..28c3bf8eca9
--- /dev/null
+++ b/alembic/versions/2026_04_17_15d1eece1f2b_make_case_created_at_non_nullable.py
@@ -0,0 +1,35 @@
+"""make case created at non nullable
+
+Revision ID: 15d1eece1f2b
+Revises: fabd19666215
+Create Date: 2026-04-17 15:57:28.767193
+
+"""
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "15d1eece1f2b"
+down_revision = "fabd19666215"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.alter_column(
+        table_name="case",
+        column_name="created_at",
+        existing_type=sa.DateTime(),
+        nullable=False,
+    )
+
+
+def downgrade():
+    op.alter_column(
+        table_name="case",
+        column_name="created_at",
+        existing_type=sa.DateTime(),
+        nullable=True,
+    )
diff --git a/cg/store/models.py b/cg/store/models.py
index 413f5a2c2a1..ec884f71424 100644
--- a/cg/store/models.py
+++ b/cg/store/models.py
@@ -475,7 +475,7 @@ class Case(Base, PriorityMixin):
     )
     _cohorts: Mapped[Text | None]
     comment: Mapped[Text | None]
-    created_at: Mapped[datetime | None] = mapped_column(default=datetime.now)
+    created_at: Mapped[datetime] = mapped_column(default=datetime.now)
     customer_id: Mapped[int] = mapped_column(ForeignKey("customer.id", ondelete="CASCADE"))
     customer: Mapped["Customer"] = orm.relationship(foreign_keys=[customer_id])
     data_analysis: Mapped[Workflow] = mapped_column(