fix: Widen notification_types.type_key from VARCHAR(20) to VARCHAR(100) (migration 0107)

Plugin activation was broken for ALL inactive plugins because
sync_notification_types() tried to INSERT search_reindex_complete (22 chars)
into type_key VARCHAR(20), causing StringDataRightTruncationError.

Alembic head: 0106 → 0107

alembic/versions/0107_widen_notification_type_key.py

@@ -0,0 +1,35 @@
+"""Widen notification_types.type_key from VARCHAR(20) to VARCHAR(100).
+
+The unified_search plugin declares 'search_reindex_complete' (22 chars) as a
+notification type key, which exceeds the VARCHAR(20) limit and causes
+StringDataRightTruncationError during plugin activation (sync_notification_types).
+This breaks ALL plugin activations since sync runs for all active plugins.
+
+Revision ID: 0107
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "0107"
+down_revision = "0106"
+
+
+def upgrade() -> None:
+    op.alter_column(
+        "notification_types",
+        "type_key",
+        existing_type=sa.String(20),
+        type=sa.String(100),
+        existing_nullable=False,
+    )
+
+
+def downgrade() -> None:
+    op.alter_column(
+        "notification_types",
+        "type_key",
+        existing_type=sa.String(100),
+        type=sa.String(20),
+        existing_nullable=False,
+    )