seed for the first user creation

src/database/users/crud.py

@@ -10,6 +10,7 @@ from src.models.database_models.model import (
     engine,
 )
 from src.models.pydantic_models.model import UserOutDB
+from src.service.auth.jwt import HashService
 
 
 class UsersCrudActions:
@@ -121,4 +122,36 @@ class UsersCrudActions:
                 user_edit.direct_permissions=list(groups)
             
             await session.flush()
-            return UserOutDB.model_validate(user_edit)
+            return UserOutDB.model_validate(user_edit)
+
+class Seed:
+    def __init__(self) -> None:
+        self.Session=async_sessionmaker(bind=engine)
+        self.hash_service=HashService()
+    
+    async def seed(self) -> None:
+        async with self.Session() as session, session.begin():
+            
+            existing = (await session.execute(select(User).limit(1))).scalar_one_or_none()
+            if existing is not None:
+                print("Seed skipped: one user is already exist")
+                return
+
+            admin_permission = Permissions(permission="admin")
+            session.add(admin_permission)
+
+            admin_group = PermissionsGroups(group="admin_group", permissions=[admin_permission])
+            session.add(admin_group)
+
+            admin_user = User(
+                first_name="Admin",
+                last_name="Admin",
+                middle_name="Admin",
+                email="admin@admin.com",
+                hashed_password=self.hash_service.plain_to_hash("1234"),
+                direct_permissions=[admin_permission],
+                group=[admin_group],
+            )
+            session.add(admin_user)
+
+            print("Seed completed: admin user and permissions are created, credentials: email - admin@admin.com,  password - 1234")