feat(core): register Sequence model

app/models/__init__.py

@@ -6,6 +6,7 @@ from app.models.company import Company
 from app.models.contact import CompanyContact, Contact
 from app.models.currency import Currency
 from app.models.tax import TaxRate
+from app.models.sequence import Sequence
 from app.models.notification import Notification
 from app.models.plugin import Plugin, PluginMigration
 from app.models.role import Role
@@ -29,6 +30,8 @@ __all__ = [
     "CompanyContact",
     "Currency",
     "TaxRate",
+    "Sequence",
+    "Sequence",
     "TaxRate",
     "Plugin",
     "PluginMigration",