chore: synchronize code and database schema (#8577)

* chore: remove default null

null is always the default value if a table column is nullable, and typeorm's
@Column only accepts strings for default.

* chore: synchronize code with database schema

* chore: sync generated migrations with code

packages/backend/src/models/entities/user-profile.ts

@@ -192,6 +192,7 @@ export class UserProfile {
 
 	@Column('jsonb', {
 		default: [],
+		comment: 'List of instances muted by the user.',
 	})
 	public mutedInstances: string[];