diff --git a/alembic/versions/0134_notification_types_columns.py b/alembic/versions/0134_notification_types_columns.py
new file mode 100644
index 0000000..9947e25
--- /dev/null
+++ b/alembic/versions/0134_notification_types_columns.py
@@ -0,0 +1,26 @@
+"""Fix notification_types column sizes — VARCHAR(20) too small for values.
+
+Revision ID: 0134
+Revises: 0133
+Create Date: 2026-08-21
+"""
+from alembic import op
+
+revision = "0134"
+down_revision = "0133"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.execute("ALTER TABLE notification_types ALTER COLUMN type_key TYPE VARCHAR(100);")
+    op.execute("ALTER TABLE notification_types ALTER COLUMN plugin_name TYPE VARCHAR(100);")
+    op.execute("ALTER TABLE notification_types ALTER COLUMN category TYPE VARCHAR(50);")
+    op.execute("ALTER TABLE notification_types ALTER COLUMN label TYPE VARCHAR(200);")
+
+
+def downgrade() -> None:
+    op.execute("ALTER TABLE notification_types ALTER COLUMN label TYPE VARCHAR(200);")
+    op.execute("ALTER TABLE notification_types ALTER COLUMN category TYPE VARCHAR(20);")
+    op.execute("ALTER TABLE notification_types ALTER COLUMN plugin_name TYPE VARCHAR(20);")
+    op.execute("ALTER TABLE notification_types ALTER COLUMN type_key TYPE VARCHAR(20);")