Add missing unique constraint for author and name

Swear this was already present

migrations/versions/49105d276908_.py

@@ -0,0 +1,26 @@
+"""empty message
+
+Revision ID: 49105d276908
+Revises: 7a749a6c8c3a
+Create Date: 2023-10-01 23:25:24.870407
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = '49105d276908'
+down_revision = '7a749a6c8c3a'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    with op.batch_alter_table('package', schema=None) as batch_op:
+        batch_op.create_unique_constraint('_package_uc', ['author_id', 'name'])
+
+
+def downgrade():
+    with op.batch_alter_table('package', schema=None) as batch_op:
+        batch_op.drop_constraint('_package_uc', type_='unique')