Add check constraint on MetaPackage name

app/models.py

@@ -758,6 +758,8 @@ class MetaPackage(db.Model):
 	name         = db.Column(db.String(100), unique=True, nullable=False)
 	dependencies = db.relationship("Dependency", backref="meta_package", lazy="dynamic")
 
+	mp_name_valid = db.CheckConstraint("name ~* '^[a-z0-9_]+$'")
+
 	def __init__(self, name=None):
 		self.name = name
 

migrations/versions/838081950f27_.py

@@ -0,0 +1,30 @@
+"""empty message
+
+Revision ID: 838081950f27
+Revises: 86512692b770
+Create Date: 2020-07-12 01:33:19.499459
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '838081950f27'
+down_revision = '86512692b770'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+	op.create_check_constraint("mp_name_valid", "meta_package", "name ~* '^[a-z0-9_]+$'")
+
+	op.execute("""
+		DELETE FROM provides AS t USING meta_package AS m WHERE t.metapackage_id = m.id AND NOT (m.name ~* '^[a-z0-9_]+$');
+		DELETE FROM dependency AS t USING meta_package AS m WHERE t.meta_package_id = m.id AND NOT (m.name ~* '^[a-z0-9_]+$');
+		DELETE FROM meta_package WHERE NOT (name ~* '^[a-z0-9_]+$');
+	""")
+
+
+def downgrade():
+	op.drop_constraint("mp_name_valid", "meta_package", type_="check")